feat: add @standardnotes/encryption package (#1199)

* feat: add @standardnotes/encryption package * fix: mobile dependency on encryption package * fix: order of build & lint in pr workflows * fix: web dependency on encryption package * fix: remove encryption package composite configuration * fix: import order
2022-07-05 10:06:03 +02:00
parent 60273785c2
commit e5771fcbde
70 changed files with 4682 additions and 27 deletions
--- a/.github/workflows/pr.components.yml
+++ b/.github/workflows/pr.components.yml
@@ -30,9 +30,9 @@ jobs:
        run: yarn test
        working-directory: packages/components

-      - name: Lint all
-        run: yarn lint
      - name: Build all
        run: yarn build:all
+      - name: Lint all
+        run: yarn lint
      - name: Test all
        run: yarn test
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -18,10 +18,10 @@ jobs:
        uses: ruby/setup-ruby@v1
      - name: Install dependencies
        run: yarn install
-      - name: ESLint
-        run: yarn lint
      - name: Build
        run: yarn build:all
+      - name: ESLint
+        run: yarn lint
      - name: Build Android
        run: yarn android:bundle
      - name: Test
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,8 @@ codeqldb
 coverage
 lerna-debug.log

+packages/encryption/dist
+
 **/.pnp.*
 **/.yarn/*
 !.yarn/patches
--- a/.yarn/cache/@standardnotes-encryption-npm-1.8.22-a04b05c8a4-7a571c4b25.zip
+++ b/.yarn/cache/@standardnotes-encryption-npm-1.8.22-a04b05c8a4-7a571c4b25.zip
--- a/.yarn/cache/@standardnotes-encryption-npm-1.8.23-3dd93922b7-b86df01dc7.zip
+++ b/.yarn/cache/@standardnotes-encryption-npm-1.8.23-3dd93922b7-b86df01dc7.zip
--- a/.yarn/cache/@types-node-npm-18.0.1-35e22b3e26-be14b251c5.zip
+++ b/.yarn/cache/@types-node-npm-18.0.1-35e22b3e26-be14b251c5.zip
--- a/.yarn/cache/@typescript-eslint-eslint-plugin-npm-5.30.4-08f53c0ede-9b9290448b.zip
+++ b/.yarn/cache/@typescript-eslint-eslint-plugin-npm-5.30.4-08f53c0ede-9b9290448b.zip
--- a/.yarn/cache/@typescript-eslint-scope-manager-npm-5.30.4-8b6cf23765-3da442dc11.zip
+++ b/.yarn/cache/@typescript-eslint-scope-manager-npm-5.30.4-8b6cf23765-3da442dc11.zip
--- a/.yarn/cache/@typescript-eslint-type-utils-npm-5.30.4-f2696bf1f1-552eb1a5b1.zip
+++ b/.yarn/cache/@typescript-eslint-type-utils-npm-5.30.4-f2696bf1f1-552eb1a5b1.zip
--- a/.yarn/cache/@typescript-eslint-types-npm-5.30.4-c748bd84f1-06181c3355.zip
+++ b/.yarn/cache/@typescript-eslint-types-npm-5.30.4-c748bd84f1-06181c3355.zip
--- a/.yarn/cache/@typescript-eslint-typescript-estree-npm-5.30.4-7c97ea55f3-1aaa414993.zip
+++ b/.yarn/cache/@typescript-eslint-typescript-estree-npm-5.30.4-7c97ea55f3-1aaa414993.zip
--- a/.yarn/cache/@typescript-eslint-utils-npm-5.30.4-6bd4c125c1-0f680d3667.zip
+++ b/.yarn/cache/@typescript-eslint-utils-npm-5.30.4-6bd4c125c1-0f680d3667.zip
--- a/.yarn/cache/@typescript-eslint-visitor-keys-npm-5.30.4-19f4a2caf4-ec39680a89.zip
+++ b/.yarn/cache/@typescript-eslint-visitor-keys-npm-5.30.4-19f4a2caf4-ec39680a89.zip
--- a/.yarn/cache/eslint-plugin-prettier-npm-4.2.1-ba8e1240f1-b9e839d233.zip
+++ b/.yarn/cache/eslint-plugin-prettier-npm-4.2.1-ba8e1240f1-b9e839d233.zip
--- a/.yarn/cache/reflect-metadata-npm-0.1.13-c525998e20-798d379a7b.zip
+++ b/.yarn/cache/reflect-metadata-npm-0.1.13-c525998e20-798d379a7b.zip
--- a/packages/encryption/.eslintignore
+++ b/packages/encryption/.eslintignore
@@ -0,0 +1,2 @@
+node_modules
+dist
--- a/packages/encryption/.eslintrc
+++ b/packages/encryption/.eslintrc
@@ -0,0 +1,10 @@
+{
+  "extends": "../../.eslintrc",
+  "parserOptions": {
+    "project": "./linter.tsconfig.json"
+  },
+  "rules": {
+    "@typescript-eslint/no-explicit-any": ["warn", { "ignoreRestArgs": true }],
+    "@typescript-eslint/no-non-null-assertion": "warn"
+  }
+}
--- a/packages/encryption/CHANGELOG.md
+++ b/packages/encryption/CHANGELOG.md
@@ -0,0 +1,361 @@
+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## [1.8.24](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.23...@standardnotes/encryption@1.8.24) (2022-07-04)
+
+### Bug Fixes
+
+* add missing reflect-metadata package to all packages ([ce3a5bb](https://github.com/standardnotes/snjs/commit/ce3a5bbf3f1d2276ac4abc3eec3c6a44c8c3ba9b))
+* unit tests running ([9ddc55c](https://github.com/standardnotes/snjs/commit/9ddc55c59c781e2bcc366304a6d0cc88d0e0865d))
+
+## [1.8.23](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.22...@standardnotes/encryption@1.8.23) (2022-06-29)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.22](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.21...@standardnotes/encryption@1.8.22) (2022-06-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.21](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.20...@standardnotes/encryption@1.8.21) (2022-06-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.20](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.19...@standardnotes/encryption@1.8.20) (2022-06-22)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.19](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.18...@standardnotes/encryption@1.8.19) (2022-06-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.18](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.17...@standardnotes/encryption@1.8.18) (2022-06-16)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.17](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.16...@standardnotes/encryption@1.8.17) (2022-06-16)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.16](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.15...@standardnotes/encryption@1.8.16) (2022-06-15)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.15](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.14...@standardnotes/encryption@1.8.15) (2022-06-10)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.14](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.13...@standardnotes/encryption@1.8.14) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.13](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.12...@standardnotes/encryption@1.8.13) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.12](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.11...@standardnotes/encryption@1.8.12) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.11](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.10...@standardnotes/encryption@1.8.11) (2022-06-06)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.10](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.9...@standardnotes/encryption@1.8.10) (2022-06-03)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.9](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.8...@standardnotes/encryption@1.8.9) (2022-06-02)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.8](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.7...@standardnotes/encryption@1.8.8) (2022-06-02)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.7](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.6...@standardnotes/encryption@1.8.7) (2022-06-01)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.6](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.5...@standardnotes/encryption@1.8.6) (2022-05-30)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.5](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.4...@standardnotes/encryption@1.8.5) (2022-05-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.3...@standardnotes/encryption@1.8.4) (2022-05-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.2...@standardnotes/encryption@1.8.3) (2022-05-24)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.1...@standardnotes/encryption@1.8.2) (2022-05-24)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.8.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.8.0...@standardnotes/encryption@1.8.1) (2022-05-22)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+# [1.8.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.12...@standardnotes/encryption@1.8.0) (2022-05-21)
+
+### Features
+
+* display controllers ([#743](https://github.com/standardnotes/snjs/issues/743)) ([5fadce3](https://github.com/standardnotes/snjs/commit/5fadce37f1b3f2f51b8a90c257bc666ac7710074))
+
+## [1.7.12](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.11...@standardnotes/encryption@1.7.12) (2022-05-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.11](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.10...@standardnotes/encryption@1.7.11) (2022-05-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.10](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.9...@standardnotes/encryption@1.7.10) (2022-05-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.9](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.8...@standardnotes/encryption@1.7.9) (2022-05-18)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.8](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.7...@standardnotes/encryption@1.7.8) (2022-05-17)
+
+### Bug Fixes
+
+* workspace signout all ([0ac4501](https://github.com/standardnotes/snjs/commit/0ac45019428946016ef02384b07b8190378008fc))
+
+## [1.7.7](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.6...@standardnotes/encryption@1.7.7) (2022-05-17)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.6](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.5...@standardnotes/encryption@1.7.6) (2022-05-17)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.5](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.4...@standardnotes/encryption@1.7.5) (2022-05-16)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.3...@standardnotes/encryption@1.7.4) (2022-05-16)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.2...@standardnotes/encryption@1.7.3) (2022-05-16)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.1...@standardnotes/encryption@1.7.2) (2022-05-13)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.7.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.7.0...@standardnotes/encryption@1.7.1) (2022-05-12)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+# [1.7.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.12...@standardnotes/encryption@1.7.0) (2022-05-12)
+
+### Features
+
+* file desktop backups ([#731](https://github.com/standardnotes/snjs/issues/731)) ([0dbce7d](https://github.com/standardnotes/snjs/commit/0dbce7dc9712fde848445b951079c81479c8bc11))
+
+## [1.6.12](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.11...@standardnotes/encryption@1.6.12) (2022-05-12)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.11](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.10...@standardnotes/encryption@1.6.11) (2022-05-12)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.10](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.9...@standardnotes/encryption@1.6.10) (2022-05-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.9](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.8...@standardnotes/encryption@1.6.9) (2022-05-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.8](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.7...@standardnotes/encryption@1.6.8) (2022-05-09)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.7](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.6...@standardnotes/encryption@1.6.7) (2022-05-06)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.6](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.5...@standardnotes/encryption@1.6.6) (2022-05-06)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.5](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.4...@standardnotes/encryption@1.6.5) (2022-05-05)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.2...@standardnotes/encryption@1.6.4) (2022-05-04)
+
+### Bug Fixes
+
+* config package missing dependencies ([3dec12f](https://github.com/standardnotes/snjs/commit/3dec12fa4a83a8aed8419819eafb7c34795cb09f))
+
+## [1.6.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.2...@standardnotes/encryption@1.6.3) (2022-05-04)
+
+### Bug Fixes
+
+* config package missing dependencies ([3dec12f](https://github.com/standardnotes/snjs/commit/3dec12fa4a83a8aed8419819eafb7c34795cb09f))
+
+## [1.6.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.1...@standardnotes/encryption@1.6.2) (2022-05-03)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.6.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.6.0...@standardnotes/encryption@1.6.1) (2022-05-02)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+# [1.6.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.5.2...@standardnotes/encryption@1.6.0) (2022-04-29)
+
+### Features
+
+* service diagnostics ([#718](https://github.com/standardnotes/snjs/issues/718)) ([17cf40f](https://github.com/standardnotes/snjs/commit/17cf40f4489c8f1915b19c0318d252cf83bc050d))
+
+## [1.5.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.5.1...@standardnotes/encryption@1.5.2) (2022-04-28)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.5.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.5.0...@standardnotes/encryption@1.5.1) (2022-04-28)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+# [1.5.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.13...@standardnotes/encryption@1.5.0) (2022-04-28)
+
+### Features
+
+* refactor sncrypto to add unified sha256 and base64 usage  ([#715](https://github.com/standardnotes/snjs/issues/715)) ([93aef4d](https://github.com/standardnotes/snjs/commit/93aef4d39228a63f01aa90a88e5d28c3375ed707))
+
+## [1.4.13](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.12...@standardnotes/encryption@1.4.13) (2022-04-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.12](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.11...@standardnotes/encryption@1.4.12) (2022-04-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.11](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.10...@standardnotes/encryption@1.4.11) (2022-04-27)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.10](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.9...@standardnotes/encryption@1.4.10) (2022-04-25)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.9](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.8...@standardnotes/encryption@1.4.9) (2022-04-22)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.8](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.7...@standardnotes/encryption@1.4.8) (2022-04-22)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.7](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.6...@standardnotes/encryption@1.4.7) (2022-04-21)
+
+### Bug Fixes
+
+* abort key recovery after aborted challenge ([#703](https://github.com/standardnotes/snjs/issues/703)) ([a67fb7e](https://github.com/standardnotes/snjs/commit/a67fb7e8cde41a5c9fadf545933e35d525faeaf0))
+
+## [1.4.6](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.5...@standardnotes/encryption@1.4.6) (2022-04-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.5](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.4...@standardnotes/encryption@1.4.5) (2022-04-20)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.3...@standardnotes/encryption@1.4.4) (2022-04-19)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.2...@standardnotes/encryption@1.4.3) (2022-04-19)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.1...@standardnotes/encryption@1.4.2) (2022-04-19)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.4.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.4.0...@standardnotes/encryption@1.4.1) (2022-04-18)
+
+### Bug Fixes
+
+* make timestamps required in payload construction ([#695](https://github.com/standardnotes/snjs/issues/695)) ([b3326c0](https://github.com/standardnotes/snjs/commit/b3326c0a998cd9d44a76afc377f182885ef48275))
+
+# [1.4.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.3.0...@standardnotes/encryption@1.4.0) (2022-04-15)
+
+### Features
+
+* introduce sync resolved payloads to ensure deltas always return up to date dirty state ([#694](https://github.com/standardnotes/snjs/issues/694)) ([e5278ba](https://github.com/standardnotes/snjs/commit/e5278ba0b2afa987c37f009a2101fb91949d44c6))
+
+# [1.3.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.6...@standardnotes/encryption@1.3.0) (2022-04-15)
+
+### Features
+
+* no merge payloads in payload manager ([#693](https://github.com/standardnotes/snjs/issues/693)) ([68a577c](https://github.com/standardnotes/snjs/commit/68a577cb887fd2d5556dc9ddec461f6ae665fcb6))
+
+## [1.2.6](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.5...@standardnotes/encryption@1.2.6) (2022-04-15)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.2.5](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.4...@standardnotes/encryption@1.2.5) (2022-04-14)
+
+### Bug Fixes
+
+* map ignored item timestamps so application remains in sync ([#692](https://github.com/standardnotes/snjs/issues/692)) ([966cbb0](https://github.com/standardnotes/snjs/commit/966cbb0c254d4d95c802bd8951488a499d1f8bef))
+
+## [1.2.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.3...@standardnotes/encryption@1.2.4) (2022-04-13)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.2.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.2...@standardnotes/encryption@1.2.3) (2022-04-12)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.2.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.1...@standardnotes/encryption@1.2.2) (2022-04-11)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.2.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.2.0...@standardnotes/encryption@1.2.1) (2022-04-01)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+# [1.2.0](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.1.4...@standardnotes/encryption@1.2.0) (2022-04-01)
+
+### Features
+
+* content interfaces and model type strictness ([#685](https://github.com/standardnotes/snjs/issues/685)) ([e2450c5](https://github.com/standardnotes/snjs/commit/e2450c59e8309d7080efaa03905b2abc728d9403))
+
+## [1.1.4](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.1.3...@standardnotes/encryption@1.1.4) (2022-04-01)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.1.3](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.1.2...@standardnotes/encryption@1.1.3) (2022-03-31)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.1.2](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.1.1...@standardnotes/encryption@1.1.2) (2022-03-31)
+
+**Note:** Version bump only for package @standardnotes/encryption
+
+## [1.1.1](https://github.com/standardnotes/snjs/compare/@standardnotes/encryption@1.1.0...@standardnotes/encryption@1.1.1) (2022-03-31)
+
+### Bug Fixes
+
+* return undefined instead of exception when items key is not yet available ([#682](https://github.com/standardnotes/snjs/issues/682)) ([0dd7dbe](https://github.com/standardnotes/snjs/commit/0dd7dbe64c086bbdd539f24d428ac1d2bb491f16))
+
+# 1.1.0 (2022-03-31)
+
+### Features
+
+* encryption and models packages ([#679](https://github.com/standardnotes/snjs/issues/679)) ([5e03d48](https://github.com/standardnotes/snjs/commit/5e03d48aba7e3dd266117201139ab869b1f70cc9))
--- a/packages/encryption/jest.config.js
+++ b/packages/encryption/jest.config.js
@@ -0,0 +1,11 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const base = require('../../node_modules/@standardnotes/config/src/jest.json');
+
+module.exports = {
+  ...base,
+  globals: {
+    'ts-jest': {
+      tsconfig: 'tsconfig.json',
+    },
+  }
+};
--- a/packages/encryption/linter.tsconfig.json
+++ b/packages/encryption/linter.tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["dist"]
+}
--- a/packages/encryption/package.json
+++ b/packages/encryption/package.json
@@ -0,0 +1,45 @@
+{
+  "name": "@standardnotes/encryption",
+  "version": "1.9.0",
+  "engines": {
+    "node": ">=16.0.0 <17.0.0"
+  },
+  "description": "Payload encryption used in SNJS library",
+  "main": "dist/index.js",
+  "author": "Standard Notes",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "AGPL-3.0-or-later",
+  "scripts": {
+    "clean": "rm -fr dist",
+    "prestart": "yarn clean",
+    "start": "tsc -p tsconfig.json --watch",
+    "prebuild": "yarn clean",
+    "build": "tsc -p tsconfig.json",
+    "lint": "eslint . --ext .ts",
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@standardnotes/config": "2.4.3",
+    "@types/jest": "^27.4.1",
+    "@types/node": "^18.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.30.0",
+    "eslint-plugin-prettier": "^4.2.1",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.3"
+  },
+  "dependencies": {
+    "@standardnotes/common": "^1.23.1",
+    "@standardnotes/models": "^1.11.13",
+    "@standardnotes/responses": "^1.6.39",
+    "@standardnotes/services": "^1.13.23",
+    "@standardnotes/sncrypto-common": "^1.9.0",
+    "@standardnotes/utils": "^1.6.12",
+    "reflect-metadata": "^0.1.13"
+  }
+}
--- a/packages/encryption/src/Domain/Algorithm.ts
+++ b/packages/encryption/src/Domain/Algorithm.ts
@@ -0,0 +1,46 @@
+export const V001Algorithm = Object.freeze({
+  SaltSeedLength: 128,
+  /**
+   * V001 supported a variable PBKDF2 cost
+   */
+  PbkdfMinCost: 3000,
+  PbkdfCostsUsed: [3000, 5000, 10_000, 60_000],
+  PbkdfOutputLength: 512,
+  EncryptionKeyLength: 256,
+})
+
+export const V002Algorithm = Object.freeze({
+  SaltSeedLength: 128,
+  /**
+   * V002 supported a variable PBKDF2 cost
+   */
+  PbkdfMinCost: 3000,
+  /**
+   * While some 002 accounts also used costs in V001.PbkdfCostsUsed,
+   * the vast majority used costs >= 100,000
+   */
+  PbkdfCostsUsed: V001Algorithm.PbkdfCostsUsed.concat([100_000, 101_000, 102_000, 103_000]),
+  /** Possible costs used, but statistically more likely these were 001 accounts */
+  ImprobablePbkdfCostsUsed: [3000, 5000],
+  PbkdfOutputLength: 768,
+  EncryptionKeyLength: 256,
+  EncryptionIvLength: 128,
+})
+
+export enum V003Algorithm {
+  SaltSeedLength = 256,
+  PbkdfCost = 110000,
+  PbkdfOutputLength = 768,
+  EncryptionKeyLength = 256,
+  EncryptionIvLength = 128,
+}
+
+export enum V004Algorithm {
+  ArgonSaltSeedLength = 256,
+  ArgonSaltLength = 128,
+  ArgonIterations = 5,
+  ArgonMemLimit = 67108864,
+  ArgonOutputKeyBytes = 64,
+  EncryptionKeyLength = 256,
+  EncryptionNonceLength = 192,
+}
--- a/packages/encryption/src/Domain/Backups/BackupFile.ts
+++ b/packages/encryption/src/Domain/Backups/BackupFile.ts
@@ -0,0 +1,23 @@
+import { BackupFileDecryptedContextualPayload, BackupFileEncryptedContextualPayload } from '@standardnotes/models'
+import { AnyKeyParamsContent, ProtocolVersion } from '@standardnotes/common'
+
+export type BackupFile = {
+  version?: ProtocolVersion
+  keyParams?: AnyKeyParamsContent
+  auth_params?: AnyKeyParamsContent
+  items: (BackupFileDecryptedContextualPayload | BackupFileEncryptedContextualPayload)[]
+}
+
+export enum BackupFileType {
+  Encrypted = 'Encrypted',
+
+  /**
+   * Generated when an export is made from an application with no account and no passcode. The
+   * items are encrypted, but the items keys are not.
+   */
+  EncryptedWithNonEncryptedItemsKey = 'EncryptedWithNonEncryptedItemsKey',
+
+  FullyDecrypted = 'FullyDecrypted',
+
+  Corrupt = 'Corrupt',
+}
--- a/packages/encryption/src/Domain/Backups/BackupFileDecryptor.ts
+++ b/packages/encryption/src/Domain/Backups/BackupFileDecryptor.ts
@@ -0,0 +1,247 @@
+import {
+  AnyKeyParamsContent,
+  ContentType,
+  ProtocolVersion,
+  leftVersionGreaterThanOrEqualToRight,
+  compareVersions,
+} from '@standardnotes/common'
+import { BackupFile, BackupFileType } from './BackupFile'
+import { extendArray } from '@standardnotes/utils'
+import { EncryptionService } from '../Service/Encryption/EncryptionService'
+import {
+  PayloadInterface,
+  DecryptedPayloadInterface,
+  ItemsKeyContent,
+  EncryptedPayloadInterface,
+  isEncryptedPayload,
+  isDecryptedPayload,
+  isEncryptedTransferPayload,
+  EncryptedPayload,
+  DecryptedPayload,
+  isDecryptedTransferPayload,
+  CreateDecryptedItemFromPayload,
+  ItemsKeyInterface,
+  CreatePayloadSplit,
+} from '@standardnotes/models'
+import { ClientDisplayableError } from '@standardnotes/responses'
+import { CreateAnyKeyParams } from '../Keys/RootKey/KeyParamsFunctions'
+import { SNRootKeyParams } from '../Keys/RootKey/RootKeyParams'
+import { SNRootKey } from '../Keys/RootKey/RootKey'
+import { ContentTypeUsesRootKeyEncryption } from '../Keys/RootKey/Functions'
+import { isItemsKey, SNItemsKey } from '../Keys/ItemsKey'
+
+export async function DecryptBackupFile(
+  file: BackupFile,
+  protocolService: EncryptionService,
+  password?: string,
+): Promise<ClientDisplayableError | (EncryptedPayloadInterface | DecryptedPayloadInterface)[]> {
+  const payloads: (EncryptedPayloadInterface | DecryptedPayloadInterface)[] = file.items.map((item) => {
+    if (isEncryptedTransferPayload(item)) {
+      return new EncryptedPayload(item)
+    } else if (isDecryptedTransferPayload(item)) {
+      return new DecryptedPayload(item)
+    } else {
+      throw Error('Unhandled case in decryptBackupFile')
+    }
+  })
+
+  const { encrypted, decrypted } = CreatePayloadSplit(payloads)
+
+  const type = getBackupFileType(file, payloads)
+
+  switch (type) {
+    case BackupFileType.Corrupt:
+      return new ClientDisplayableError('Invalid backup file.')
+    case BackupFileType.Encrypted: {
+      if (!password) {
+        throw Error('Attempting to decrypt encrypted file with no password')
+      }
+
+      const keyParamsData = (file.keyParams || file.auth_params) as AnyKeyParamsContent
+
+      return [
+        ...decrypted,
+        ...(await decryptEncrypted(password, CreateAnyKeyParams(keyParamsData), encrypted, protocolService)),
+      ]
+    }
+    case BackupFileType.EncryptedWithNonEncryptedItemsKey:
+      return [...decrypted, ...(await decryptEncryptedWithNonEncryptedItemsKey(payloads, protocolService))]
+    case BackupFileType.FullyDecrypted:
+      return [...decrypted, ...encrypted]
+  }
+}
+
+function getBackupFileType(file: BackupFile, payloads: PayloadInterface[]): BackupFileType {
+  if (file.keyParams || file.auth_params) {
+    return BackupFileType.Encrypted
+  } else {
+    const hasEncryptedItem = payloads.find(isEncryptedPayload)
+    const hasDecryptedItemsKey = payloads.find(
+      (payload) => payload.content_type === ContentType.ItemsKey && isDecryptedPayload(payload),
+    )
+
+    if (hasEncryptedItem && hasDecryptedItemsKey) {
+      return BackupFileType.EncryptedWithNonEncryptedItemsKey
+    } else if (!hasEncryptedItem) {
+      return BackupFileType.FullyDecrypted
+    } else {
+      return BackupFileType.Corrupt
+    }
+  }
+}
+
+async function decryptEncryptedWithNonEncryptedItemsKey(
+  allPayloads: (EncryptedPayloadInterface | DecryptedPayloadInterface)[],
+  protocolService: EncryptionService,
+): Promise<(EncryptedPayloadInterface | DecryptedPayloadInterface)[]> {
+  const decryptedItemsKeys: DecryptedPayloadInterface<ItemsKeyContent>[] = []
+  const encryptedPayloads: EncryptedPayloadInterface[] = []
+
+  allPayloads.forEach((payload) => {
+    if (payload.content_type === ContentType.ItemsKey && isDecryptedPayload(payload)) {
+      decryptedItemsKeys.push(payload as DecryptedPayloadInterface<ItemsKeyContent>)
+    } else if (isEncryptedPayload(payload)) {
+      encryptedPayloads.push(payload)
+    }
+  })
+
+  const itemsKeys = decryptedItemsKeys.map((p) => CreateDecryptedItemFromPayload<ItemsKeyContent, SNItemsKey>(p))
+
+  return decryptWithItemsKeys(encryptedPayloads, itemsKeys, protocolService)
+}
+
+function findKeyToUseForPayload(
+  payload: EncryptedPayloadInterface,
+  availableKeys: ItemsKeyInterface[],
+  protocolService: EncryptionService,
+  keyParams?: SNRootKeyParams,
+  fallbackRootKey?: SNRootKey,
+): ItemsKeyInterface | SNRootKey | undefined {
+  let itemsKey: ItemsKeyInterface | SNRootKey | undefined
+
+  if (payload.items_key_id) {
+    itemsKey = protocolService.itemsKeyForPayload(payload)
+    if (itemsKey) {
+      return itemsKey
+    }
+  }
+
+  itemsKey = availableKeys.find((itemsKeyPayload) => {
+    return payload.items_key_id === itemsKeyPayload.uuid
+  })
+
+  if (itemsKey) {
+    return itemsKey
+  }
+
+  if (!keyParams) {
+    return undefined
+  }
+
+  const payloadVersion = payload.version as ProtocolVersion
+
+  /**
+   * Payloads with versions <= 003 use root key directly for encryption.
+   * However, if the incoming key params are >= 004, this means we should
+   * have an items key based off the 003 root key. We can't use the 004
+   * root key directly because it's missing dataAuthenticationKey.
+   */
+  if (leftVersionGreaterThanOrEqualToRight(keyParams.version, ProtocolVersion.V004)) {
+    itemsKey = protocolService.defaultItemsKeyForItemVersion(payloadVersion, availableKeys)
+  } else if (compareVersions(payloadVersion, ProtocolVersion.V003) <= 0) {
+    itemsKey = fallbackRootKey
+  }
+
+  return itemsKey
+}
+
+async function decryptWithItemsKeys(
+  payloads: EncryptedPayloadInterface[],
+  itemsKeys: ItemsKeyInterface[],
+  protocolService: EncryptionService,
+  keyParams?: SNRootKeyParams,
+  fallbackRootKey?: SNRootKey,
+): Promise<(DecryptedPayloadInterface | EncryptedPayloadInterface)[]> {
+  const results: (DecryptedPayloadInterface | EncryptedPayloadInterface)[] = []
+
+  for (const encryptedPayload of payloads) {
+    if (ContentTypeUsesRootKeyEncryption(encryptedPayload.content_type)) {
+      continue
+    }
+
+    try {
+      const key = findKeyToUseForPayload(encryptedPayload, itemsKeys, protocolService, keyParams, fallbackRootKey)
+
+      if (!key) {
+        results.push(
+          encryptedPayload.copy({
+            errorDecrypting: true,
+          }),
+        )
+        continue
+      }
+
+      if (isItemsKey(key)) {
+        const decryptedPayload = await protocolService.decryptSplitSingle({
+          usesItemsKey: {
+            items: [encryptedPayload],
+            key: key,
+          },
+        })
+        results.push(decryptedPayload)
+      } else {
+        const decryptedPayload = await protocolService.decryptSplitSingle({
+          usesRootKey: {
+            items: [encryptedPayload],
+            key: key,
+          },
+        })
+        results.push(decryptedPayload)
+      }
+    } catch (e) {
+      results.push(
+        encryptedPayload.copy({
+          errorDecrypting: true,
+        }),
+      )
+      console.error('Error decrypting payload', encryptedPayload, e)
+    }
+  }
+
+  return results
+}
+
+async function decryptEncrypted(
+  password: string,
+  keyParams: SNRootKeyParams,
+  payloads: EncryptedPayloadInterface[],
+  protocolService: EncryptionService,
+): Promise<(EncryptedPayloadInterface | DecryptedPayloadInterface)[]> {
+  const results: (EncryptedPayloadInterface | DecryptedPayloadInterface)[] = []
+  const rootKey = await protocolService.computeRootKey(password, keyParams)
+
+  const itemsKeysPayloads = payloads.filter((payload) => {
+    return payload.content_type === ContentType.ItemsKey
+  })
+
+  const itemsKeysDecryptionResults = await protocolService.decryptSplit({
+    usesRootKey: {
+      items: itemsKeysPayloads,
+      key: rootKey,
+    },
+  })
+
+  extendArray(results, itemsKeysDecryptionResults)
+
+  const decryptedPayloads = await decryptWithItemsKeys(
+    payloads,
+    itemsKeysDecryptionResults.filter(isDecryptedPayload).map((p) => CreateDecryptedItemFromPayload(p)),
+    protocolService,
+    keyParams,
+    rootKey,
+  )
+
+  extendArray(results, decryptedPayloads)
+
+  return results
+}
--- a/packages/encryption/src/Domain/Keys/ItemsKey/ItemsKey.ts
+++ b/packages/encryption/src/Domain/Keys/ItemsKey/ItemsKey.ts
@@ -0,0 +1,46 @@
+import {
+  ConflictStrategy,
+  ItemsKeyContent,
+  DecryptedItem,
+  DecryptedPayloadInterface,
+  DecryptedItemInterface,
+  HistoryEntryInterface,
+  ItemsKeyInterface,
+  RootKeyInterface,
+} from '@standardnotes/models'
+import { ContentType, ProtocolVersion } from '@standardnotes/common'
+
+export function isItemsKey(x: ItemsKeyInterface | RootKeyInterface): x is ItemsKeyInterface {
+  return x.content_type === ContentType.ItemsKey
+}
+
+/**
+ * A key used to encrypt other items. Items keys are synced and persisted.
+ */
+export class SNItemsKey extends DecryptedItem<ItemsKeyContent> implements ItemsKeyInterface {
+  keyVersion: ProtocolVersion
+  isDefault: boolean | undefined
+  itemsKey: string
+
+  constructor(payload: DecryptedPayloadInterface<ItemsKeyContent>) {
+    super(payload)
+    this.keyVersion = payload.content.version
+    this.isDefault = payload.content.isDefault
+    this.itemsKey = this.payload.content.itemsKey
+  }
+
+  /** Do not duplicate items keys. Always keep original */
+  override strategyWhenConflictingWithItem(
+    _item: DecryptedItemInterface,
+    _previousRevision?: HistoryEntryInterface,
+  ): ConflictStrategy {
+    return ConflictStrategy.KeepBase
+  }
+
+  get dataAuthenticationKey(): string | undefined {
+    if (this.keyVersion === ProtocolVersion.V004) {
+      throw 'Attempting to access legacy data authentication key.'
+    }
+    return this.payload.content.dataAuthenticationKey
+  }
+}
--- a/packages/encryption/src/Domain/Keys/ItemsKey/ItemsKeyMutator.ts
+++ b/packages/encryption/src/Domain/Keys/ItemsKey/ItemsKeyMutator.ts
@@ -0,0 +1,7 @@
+import { DecryptedItemMutator, ItemsKeyMutatorInterface, ItemsKeyContent } from '@standardnotes/models'
+
+export class ItemsKeyMutator extends DecryptedItemMutator<ItemsKeyContent> implements ItemsKeyMutatorInterface {
+  set isDefault(isDefault: boolean) {
+    this.mutableContent.isDefault = isDefault
+  }
+}
--- a/packages/encryption/src/Domain/Keys/ItemsKey/Registration.ts
+++ b/packages/encryption/src/Domain/Keys/ItemsKey/Registration.ts
@@ -0,0 +1,6 @@
+import { ContentType } from '@standardnotes/common'
+import { RegisterItemClass, DecryptedItemMutator, ItemsKeyContent } from '@standardnotes/models'
+import { SNItemsKey } from './ItemsKey'
+import { ItemsKeyMutator } from './ItemsKeyMutator'
+
+RegisterItemClass(ContentType.ItemsKey, SNItemsKey, ItemsKeyMutator as unknown as DecryptedItemMutator<ItemsKeyContent>)
--- a/packages/encryption/src/Domain/Keys/ItemsKey/index.ts
+++ b/packages/encryption/src/Domain/Keys/ItemsKey/index.ts
@@ -0,0 +1,3 @@
+export * from './ItemsKey'
+export * from './ItemsKeyMutator'
+export * from './Registration'
--- a/packages/encryption/src/Domain/Keys/RootKey/Functions.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/Functions.ts
@@ -0,0 +1,51 @@
+import { SNRootKey } from './RootKey'
+import {
+  DecryptedPayload,
+  FillItemContentSpecialized,
+  PayloadTimestampDefaults,
+  RootKeyContent,
+  RootKeyContentSpecialized,
+} from '@standardnotes/models'
+import { UuidGenerator } from '@standardnotes/utils'
+import { ContentType, ProtocolVersion } from '@standardnotes/common'
+
+export function CreateNewRootKey(content: RootKeyContentSpecialized): SNRootKey {
+  const uuid = UuidGenerator.GenerateUuid()
+
+  const payload = new DecryptedPayload<RootKeyContent>({
+    uuid: uuid,
+    content_type: ContentType.RootKey,
+    content: FillRootKeyContent(content),
+    ...PayloadTimestampDefaults(),
+  })
+
+  return new SNRootKey(payload)
+}
+
+export function FillRootKeyContent(content: Partial<RootKeyContentSpecialized>): RootKeyContent {
+  if (!content.version) {
+    if (content.dataAuthenticationKey) {
+      /**
+       * If there's no version stored, it must be either 001 or 002.
+       * If there's a dataAuthenticationKey, it has to be 002. Otherwise it's 001.
+       */
+      content.version = ProtocolVersion.V002
+    } else {
+      content.version = ProtocolVersion.V001
+    }
+  }
+
+  return FillItemContentSpecialized(content)
+}
+
+export function ContentTypeUsesRootKeyEncryption(contentType: ContentType): boolean {
+  return (
+    contentType === ContentType.RootKey ||
+    contentType === ContentType.ItemsKey ||
+    contentType === ContentType.EncryptedStorage
+  )
+}
+
+export function ItemContentTypeUsesRootKeyEncryption(contentType: ContentType): boolean {
+  return contentType === ContentType.ItemsKey
+}
--- a/packages/encryption/src/Domain/Keys/RootKey/KeyParamsFunctions.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/KeyParamsFunctions.ts
@@ -0,0 +1,60 @@
+import { KeyParamsResponse } from '@standardnotes/responses'
+import {
+  KeyParamsContent001,
+  KeyParamsContent002,
+  KeyParamsContent003,
+  KeyParamsContent004,
+  AnyKeyParamsContent,
+} from '@standardnotes/common'
+import { SNRootKeyParams } from './RootKeyParams'
+import { ProtocolVersionForKeyParams } from './ProtocolVersionForKeyParams'
+
+/**
+ *  001, 002:
+ *  - Nonce is not uploaded to server, instead used to compute salt locally and send to server
+ *  - Salt is returned from server
+ *  - Cost/iteration count is returned from the server
+ *  - Account identifier is returned as 'email'
+ *  003, 004:
+ *  - Salt is computed locally via the seed (pw_nonce) returned from the server
+ *  - Cost/iteration count is determined locally by the protocol version
+ *  - Account identifier is returned as 'identifier'
+ */
+
+export type AllKeyParamsContents = KeyParamsContent001 & KeyParamsContent002 & KeyParamsContent003 & KeyParamsContent004
+
+export function Create001KeyParams(keyParams: KeyParamsContent001) {
+  return CreateAnyKeyParams(keyParams)
+}
+
+export function Create002KeyParams(keyParams: KeyParamsContent002) {
+  return CreateAnyKeyParams(keyParams)
+}
+
+export function Create003KeyParams(keyParams: KeyParamsContent003) {
+  return CreateAnyKeyParams(keyParams)
+}
+
+export function Create004KeyParams(keyParams: KeyParamsContent004) {
+  return CreateAnyKeyParams(keyParams)
+}
+
+export function CreateAnyKeyParams(keyParams: AnyKeyParamsContent) {
+  if ('content' in keyParams) {
+    throw Error('Raw key params shouldnt have content; perhaps you passed in a SNRootKeyParams object.')
+  }
+  return new SNRootKeyParams(keyParams)
+}
+
+export function KeyParamsFromApiResponse(response: KeyParamsResponse, identifier?: string) {
+  const rawKeyParams: AnyKeyParamsContent = {
+    identifier: identifier || response.data.identifier!,
+    pw_cost: response.data.pw_cost!,
+    pw_nonce: response.data.pw_nonce!,
+    pw_salt: response.data.pw_salt!,
+    version: ProtocolVersionForKeyParams(response.data),
+    origination: response.data.origination,
+    created: response.data.created,
+  }
+  return CreateAnyKeyParams(rawKeyParams)
+}
--- a/packages/encryption/src/Domain/Keys/RootKey/ProtocolVersionForKeyParams.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/ProtocolVersionForKeyParams.ts
@@ -0,0 +1,49 @@
+import { V001Algorithm, V002Algorithm } from '../../Algorithm'
+import { KeyParamsData } from '@standardnotes/responses'
+import { AnyKeyParamsContent, ProtocolVersion } from '@standardnotes/common'
+
+export function ProtocolVersionForKeyParams(response: KeyParamsData | AnyKeyParamsContent): ProtocolVersion {
+  if (response.version) {
+    return response.version
+  }
+  /**
+   * 001 and 002 key params (as stored locally) may not report a version number.
+   * In some cases it may be impossible to differentiate between 001 and 002 params,
+   * but there are a few rules we can use to find a best fit.
+   */
+  /**
+   * First try to determine by cost. If the cost appears in V002 costs but not V001 costs,
+   * we know it's 002.
+   */
+  const cost = response.pw_cost!
+  const appearsInV001 = V001Algorithm.PbkdfCostsUsed.includes(cost)
+  const appearsInV002 = V002Algorithm.PbkdfCostsUsed.includes(cost)
+
+  if (appearsInV001 && !appearsInV002) {
+    return ProtocolVersion.V001
+  } else if (appearsInV002 && !appearsInV001) {
+    return ProtocolVersion.V002
+  } else if (appearsInV002 && appearsInV001) {
+    /**
+     * If the cost appears in both versions, we can be certain it's 002 if it's missing
+     * the pw_nonce property. (However late versions of 002 also used a pw_nonce, so its
+     * presence doesn't automatically indicate 001.)
+     */
+    if (!response.pw_nonce) {
+      return ProtocolVersion.V002
+    } else {
+      /**
+       * We're now at the point that the cost has appeared in both versions, and a pw_nonce
+       * is present. We'll have to go with what is more statistically likely.
+       */
+      if (V002Algorithm.ImprobablePbkdfCostsUsed.includes(cost)) {
+        return ProtocolVersion.V001
+      } else {
+        return ProtocolVersion.V002
+      }
+    }
+  } else {
+    /** Doesn't appear in either V001 or V002; unlikely possibility. */
+    return ProtocolVersion.V002
+  }
+}
--- a/packages/encryption/src/Domain/Keys/RootKey/RootKey.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/RootKey.ts
@@ -0,0 +1,95 @@
+import { SNRootKeyParams } from './RootKeyParams'
+import {
+  RootKeyInterface,
+  RootKeyContent,
+  DecryptedItem,
+  DecryptedPayloadInterface,
+  RootKeyContentInStorage,
+  NamespacedRootKeyInKeychain,
+} from '@standardnotes/models'
+import { ProtocolVersion } from '@standardnotes/common'
+import { timingSafeEqual } from '@standardnotes/sncrypto-common'
+
+/**
+ * A root key is a local only construct that houses the key used for the encryption
+ * and decryption of items keys. A root key extends SNItem for local convenience, but is
+ * not part of the syncing or storage ecosystem—root keys are managed independently.
+ */
+export class SNRootKey extends DecryptedItem<RootKeyContent> implements RootKeyInterface {
+  public readonly keyParams: SNRootKeyParams
+
+  constructor(payload: DecryptedPayloadInterface<RootKeyContent>) {
+    super(payload)
+
+    this.keyParams = new SNRootKeyParams(payload.content.keyParams)
+  }
+
+  public get keyVersion(): ProtocolVersion {
+    return this.content.version
+  }
+
+  /**
+   * When the root key is used to encrypt items, we use the masterKey directly.
+   */
+  public get itemsKey(): string {
+    return this.masterKey
+  }
+
+  public get masterKey(): string {
+    return this.content.masterKey
+  }
+
+  /**
+   * serverPassword is not persisted as part of keychainValue, so if loaded from disk,
+   * this value may be undefined.
+   */
+  public get serverPassword(): string | undefined {
+    return this.content.serverPassword
+  }
+
+  /** 003 and below only. */
+  public get dataAuthenticationKey(): string | undefined {
+    return this.content.dataAuthenticationKey
+  }
+
+  public compare(otherKey: SNRootKey): boolean {
+    if (this.keyVersion !== otherKey.keyVersion) {
+      return false
+    }
+
+    if (this.serverPassword && otherKey.serverPassword) {
+      return (
+        timingSafeEqual(this.masterKey, otherKey.masterKey) &&
+        timingSafeEqual(this.serverPassword, otherKey.serverPassword)
+      )
+    } else {
+      return timingSafeEqual(this.masterKey, otherKey.masterKey)
+    }
+  }
+
+  /**
+   * @returns Object suitable for persist in storage when wrapped
+   */
+  public persistableValueWhenWrapping(): RootKeyContentInStorage {
+    return {
+      ...this.getKeychainValue(),
+      keyParams: this.keyParams.getPortableValue(),
+    }
+  }
+
+  /**
+   * @returns Object that is suitable for persisting in a keychain
+   */
+  public getKeychainValue(): NamespacedRootKeyInKeychain {
+    const values: NamespacedRootKeyInKeychain = {
+      version: this.keyVersion,
+      masterKey: this.masterKey,
+    }
+
+    if (this.dataAuthenticationKey) {
+      values.dataAuthenticationKey = this.dataAuthenticationKey
+    }
+
+    return values
+  }
+}
--- a/packages/encryption/src/Domain/Keys/RootKey/RootKeyParams.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/RootKeyParams.ts
@@ -0,0 +1,82 @@
+import {
+  KeyParamsContent001,
+  KeyParamsContent002,
+  KeyParamsContent003,
+  KeyParamsContent004,
+  AnyKeyParamsContent,
+  ProtocolVersion,
+  KeyParamsOrigination,
+} from '@standardnotes/common'
+import { RootKeyParamsInterface } from '@standardnotes/models'
+import { pickByCopy } from '@standardnotes/utils'
+import { ProtocolVersionForKeyParams } from './ProtocolVersionForKeyParams'
+import { ValidKeyParamsKeys } from './ValidKeyParamsKeys'
+
+export class SNRootKeyParams implements RootKeyParamsInterface {
+  public readonly content: AnyKeyParamsContent
+
+  constructor(content: AnyKeyParamsContent) {
+    this.content = {
+      ...content,
+      origination: content.origination || KeyParamsOrigination.Registration,
+      version: content.version || ProtocolVersionForKeyParams(content),
+    }
+  }
+
+  get isKeyParamsObject(): boolean {
+    return true
+  }
+
+  get identifier(): string {
+    return this.content004.identifier || this.content002.email
+  }
+
+  get version(): ProtocolVersion {
+    return this.content.version
+  }
+
+  get origination(): KeyParamsOrigination | undefined {
+    return this.content.origination
+  }
+
+  get content001(): KeyParamsContent001 {
+    return this.content as KeyParamsContent001
+  }
+
+  get content002(): KeyParamsContent002 {
+    return this.content as KeyParamsContent002
+  }
+
+  get content003(): KeyParamsContent003 {
+    return this.content as KeyParamsContent003
+  }
+
+  get content004(): KeyParamsContent004 {
+    return this.content as KeyParamsContent004
+  }
+
+  get createdDate(): Date | undefined {
+    if (!this.content004.created) {
+      return undefined
+    }
+    return new Date(Number(this.content004.created))
+  }
+
+  compare(other: SNRootKeyParams): boolean {
+    if (this.version !== other.version) {
+      return false
+    }
+
+    if ([ProtocolVersion.V004, ProtocolVersion.V003].includes(this.version)) {
+      return this.identifier === other.identifier && this.content004.pw_nonce === other.content003.pw_nonce
+    } else if ([ProtocolVersion.V002, ProtocolVersion.V001].includes(this.version)) {
+      return this.identifier === other.identifier && this.content002.pw_salt === other.content001.pw_salt
+    } else {
+      throw Error('Unhandled version in KeyParams.compare')
+    }
+  }
+
+  getPortableValue(): AnyKeyParamsContent {
+    return pickByCopy(this.content, ValidKeyParamsKeys as (keyof AnyKeyParamsContent)[])
+  }
+}
--- a/packages/encryption/src/Domain/Keys/RootKey/ValidKeyParamsKeys.ts
+++ b/packages/encryption/src/Domain/Keys/RootKey/ValidKeyParamsKeys.ts
@@ -0,0 +1,11 @@
+import { AllKeyParamsContents } from './KeyParamsFunctions'
+
+export const ValidKeyParamsKeys: (keyof AllKeyParamsContents)[] = [
+  'identifier',
+  'pw_cost',
+  'pw_nonce',
+  'pw_salt',
+  'version',
+  'origination',
+  'created',
+]
--- a/packages/encryption/src/Domain/Keys/Utils/DecryptItemsKey.ts
+++ b/packages/encryption/src/Domain/Keys/Utils/DecryptItemsKey.ts
@@ -0,0 +1,95 @@
+import {
+  DecryptedPayloadInterface,
+  EncryptedPayloadInterface,
+  isDecryptedPayload,
+  ItemsKeyContent,
+  RootKeyInterface,
+} from '@standardnotes/models'
+import {
+  ChallengePrompt,
+  ChallengeReason,
+  ChallengeServiceInterface,
+  ChallengeValidation,
+} from '@standardnotes/services'
+import { EncryptionProvider } from '../../Service/Encryption/EncryptionProvider'
+import { SNRootKeyParams } from '../RootKey/RootKeyParams'
+import { KeyRecoveryStrings } from './KeyRecoveryStrings'
+
+export async function DecryptItemsKeyWithUserFallback(
+  itemsKey: EncryptedPayloadInterface,
+  encryptor: EncryptionProvider,
+  challengor: ChallengeServiceInterface,
+): Promise<DecryptedPayloadInterface<ItemsKeyContent> | 'failed' | 'aborted'> {
+  const decryptionResult = await encryptor.decryptSplitSingle<ItemsKeyContent>({
+    usesRootKeyWithKeyLookup: {
+      items: [itemsKey],
+    },
+  })
+
+  if (isDecryptedPayload(decryptionResult)) {
+    return decryptionResult
+  }
+
+  const secondDecryptionResult = await DecryptItemsKeyByPromptingUser(itemsKey, encryptor, challengor)
+
+  if (secondDecryptionResult === 'aborted' || secondDecryptionResult === 'failed') {
+    return secondDecryptionResult
+  }
+
+  return secondDecryptionResult.decryptedKey
+}
+
+export async function DecryptItemsKeyByPromptingUser(
+  itemsKey: EncryptedPayloadInterface,
+  encryptor: EncryptionProvider,
+  challengor: ChallengeServiceInterface,
+  keyParams?: SNRootKeyParams,
+): Promise<
+  | {
+      decryptedKey: DecryptedPayloadInterface<ItemsKeyContent>
+      rootKey: RootKeyInterface
+    }
+  | 'failed'
+  | 'aborted'
+> {
+  if (!keyParams) {
+    keyParams = encryptor.getKeyEmbeddedKeyParams(itemsKey)
+  }
+
+  if (!keyParams) {
+    return 'failed'
+  }
+
+  const challenge = challengor.createChallenge(
+    [new ChallengePrompt(ChallengeValidation.None, undefined, undefined, true)],
+    ChallengeReason.Custom,
+    true,
+    KeyRecoveryStrings.KeyRecoveryLoginFlowPrompt(keyParams),
+    KeyRecoveryStrings.KeyRecoveryPasswordRequired,
+  )
+
+  const response = await challengor.promptForChallengeResponse(challenge)
+
+  if (!response) {
+    return 'aborted'
+  }
+
+  const password = response.values[0].value as string
+
+  const rootKey = await encryptor.computeRootKey(password, keyParams)
+
+  const secondDecryptionResult = await encryptor.decryptSplitSingle<ItemsKeyContent>({
+    usesRootKey: {
+      items: [itemsKey],
+      key: rootKey,
+    },
+  })
+
+  challengor.completeChallenge(challenge)
+
+  if (isDecryptedPayload(secondDecryptionResult)) {
+    return { decryptedKey: secondDecryptionResult, rootKey }
+  }
+
+  return 'failed'
+}
--- a/packages/encryption/src/Domain/Keys/Utils/KeyRecoveryStrings.ts
+++ b/packages/encryption/src/Domain/Keys/Utils/KeyRecoveryStrings.ts
@@ -0,0 +1,32 @@
+import { KeyParamsOrigination } from '@standardnotes/common'
+import { SNRootKeyParams } from '../RootKey/RootKeyParams'
+
+export const KeyRecoveryStrings = {
+  KeyRecoveryLoginFlowPrompt: (keyParams: SNRootKeyParams) => {
+    const dateString = keyParams.createdDate?.toLocaleString()
+    switch (keyParams.origination) {
+      case KeyParamsOrigination.EmailChange:
+        return `Enter your account password as it was when you changed your email on ${dateString}.`
+      case KeyParamsOrigination.PasswordChange:
+        return `Enter your account password after it was changed on ${dateString}.`
+      case KeyParamsOrigination.Registration:
+        return `Enter your account password as it was when you registered ${dateString}.`
+      case KeyParamsOrigination.ProtocolUpgrade:
+        return `Enter your account password as it was when you upgraded your encryption version on ${dateString}.`
+      case KeyParamsOrigination.PasscodeChange:
+        return `Enter your application passcode after it was changed on ${dateString}.`
+      case KeyParamsOrigination.PasscodeCreate:
+        return `Enter your application passcode as it was when you created it on ${dateString}.`
+      default:
+        throw Error('Unhandled KeyParamsOrigination case for KeyRecoveryLoginFlowPrompt')
+    }
+  },
+  KeyRecoveryLoginFlowReason: 'Your account password is required to revalidate your session.',
+  KeyRecoveryLoginFlowInvalidPassword: 'Incorrect credentials entered. Please try again.',
+  KeyRecoveryRootKeyReplaced: 'Your credentials have successfully been updated.',
+  KeyRecoveryPasscodeRequiredTitle: 'Passcode Required',
+  KeyRecoveryPasscodeRequiredText: 'You must enter your passcode in order to save your new credentials.',
+  KeyRecoveryPasswordRequired: 'Your account password is required to recover an encryption key.',
+  KeyRecoveryKeyRecovered: 'Your key has successfully been recovered.',
+  KeyRecoveryUnableToRecover: 'Unable to recover your key with the attempted password. Please try again.',
+}
--- a/packages/encryption/src/Domain/Operator/001/Operator001.ts
+++ b/packages/encryption/src/Domain/Operator/001/Operator001.ts
@@ -0,0 +1,215 @@
+import { ContentType, KeyParamsOrigination, ProtocolVersion, ProtocolVersionLength } from '@standardnotes/common'
+import { Create001KeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { firstHalfOfString, secondHalfOfString, splitString, UuidGenerator } from '@standardnotes/utils'
+import { AsynchronousOperator } from '../Operator'
+import {
+  CreateDecryptedItemFromPayload,
+  ItemsKeyContent,
+  ItemsKeyInterface,
+  FillItemContent,
+  ItemContent,
+  DecryptedPayload,
+  DecryptedPayloadInterface,
+  PayloadTimestampDefaults,
+} from '@standardnotes/models'
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { V001Algorithm } from '../../Algorithm'
+import { DecryptedParameters, EncryptedParameters, ErrorDecryptingParameters } from '../../Types/EncryptedParameters'
+import { RootKeyEncryptedAuthenticatedData } from '../../Types/RootKeyEncryptedAuthenticatedData'
+import { ItemAuthenticatedData } from '../../Types/ItemAuthenticatedData'
+import { LegacyAttachedData } from '../../Types/LegacyAttachedData'
+import { isItemsKey } from '../../Keys/ItemsKey'
+import { CreateNewRootKey } from '../../Keys/RootKey/Functions'
+
+const NO_IV = '00000000000000000000000000000000'
+
+/**
+ * @deprecated
+ * A legacy operator no longer used to generate new accounts
+ */
+export class SNProtocolOperator001 implements AsynchronousOperator {
+  protected readonly crypto: PureCryptoInterface
+
+  constructor(crypto: PureCryptoInterface) {
+    this.crypto = crypto
+  }
+
+  public getEncryptionDisplayName(): string {
+    return 'AES-256'
+  }
+
+  get version(): ProtocolVersion {
+    return ProtocolVersion.V001
+  }
+
+  protected generateNewItemsKeyContent(): ItemsKeyContent {
+    const keyLength = V001Algorithm.EncryptionKeyLength
+    const itemsKey = this.crypto.generateRandomKey(keyLength)
+    const response = FillItemContent<ItemsKeyContent>({
+      itemsKey: itemsKey,
+      version: ProtocolVersion.V001,
+    })
+    return response
+  }
+
+  /**
+   * Creates a new random items key to use for item encryption.
+   * The consumer must save/sync this item.
+   */
+  public createItemsKey(): ItemsKeyInterface {
+    const payload = new DecryptedPayload({
+      uuid: UuidGenerator.GenerateUuid(),
+      content_type: ContentType.ItemsKey,
+      content: this.generateNewItemsKeyContent(),
+      ...PayloadTimestampDefaults(),
+    })
+    return CreateDecryptedItemFromPayload(payload)
+  }
+
+  public async createRootKey(
+    identifier: string,
+    password: string,
+    origination: KeyParamsOrigination,
+  ): Promise<SNRootKey> {
+    const pwCost = V001Algorithm.PbkdfMinCost as number
+    const pwNonce = this.crypto.generateRandomKey(V001Algorithm.SaltSeedLength)
+    const pwSalt = await this.crypto.unsafeSha1(identifier + 'SN' + pwNonce)
+
+    const keyParams = Create001KeyParams({
+      email: identifier,
+      pw_cost: pwCost,
+      pw_nonce: pwNonce,
+      pw_salt: pwSalt,
+      version: ProtocolVersion.V001,
+      origination,
+      created: `${Date.now()}`,
+    })
+
+    return this.deriveKey(password, keyParams)
+  }
+
+  public getPayloadAuthenticatedData(
+    _encrypted: EncryptedParameters,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData | LegacyAttachedData | undefined {
+    return undefined
+  }
+
+  public async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    return this.deriveKey(password, keyParams)
+  }
+
+  private async decryptString(ciphertext: string, key: string) {
+    return this.crypto.aes256CbcDecrypt(ciphertext, NO_IV, key)
+  }
+
+  private async encryptString(text: string, key: string) {
+    return this.crypto.aes256CbcEncrypt(text, NO_IV, key)
+  }
+
+  public async generateEncryptedParametersAsync(
+    payload: DecryptedPayloadInterface,
+    key: ItemsKeyInterface | SNRootKey,
+  ): Promise<EncryptedParameters> {
+    /**
+     * Generate new item key that is double the key size.
+     * Will be split to create encryption key and authentication key.
+     */
+    const itemKey = this.crypto.generateRandomKey(V001Algorithm.EncryptionKeyLength * 2)
+    const encItemKey = await this.encryptString(itemKey, key.itemsKey)
+
+    /** Encrypt content */
+    const ek = firstHalfOfString(itemKey)
+    const ak = secondHalfOfString(itemKey)
+    const contentCiphertext = await this.encryptString(JSON.stringify(payload.content), ek)
+    const ciphertext = key.keyVersion + contentCiphertext
+    const authHash = await this.crypto.hmac256(ciphertext, ak)
+
+    if (!authHash) {
+      throw Error('Error generating hmac256 authHash')
+    }
+
+    return {
+      uuid: payload.uuid,
+      items_key_id: isItemsKey(key) ? key.uuid : undefined,
+      content: ciphertext,
+      enc_item_key: encItemKey,
+      auth_hash: authHash,
+      version: this.version,
+    }
+  }
+
+  public async generateDecryptedParametersAsync<C extends ItemContent = ItemContent>(
+    encrypted: EncryptedParameters,
+    key: ItemsKeyInterface | SNRootKey,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    if (!encrypted.enc_item_key) {
+      console.error(Error('Missing item encryption key, skipping decryption.'))
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    let encryptedItemKey = encrypted.enc_item_key
+    encryptedItemKey = this.version + encryptedItemKey
+    const itemKeyComponents = this.encryptionComponentsFromString(encryptedItemKey, key.itemsKey)
+
+    const itemKey = await this.decryptString(itemKeyComponents.ciphertext, itemKeyComponents.key)
+    if (!itemKey) {
+      console.error('Error decrypting parameters', encrypted)
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    const ek = firstHalfOfString(itemKey)
+    const itemParams = this.encryptionComponentsFromString(encrypted.content, ek)
+    const content = await this.decryptString(itemParams.ciphertext, itemParams.key)
+
+    if (!content) {
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    } else {
+      return {
+        uuid: encrypted.uuid,
+        content: JSON.parse(content),
+      }
+    }
+  }
+
+  private encryptionComponentsFromString(string: string, encryptionKey: string) {
+    const encryptionVersion = string.substring(0, ProtocolVersionLength)
+    return {
+      ciphertext: string.substring(ProtocolVersionLength, string.length),
+      version: encryptionVersion,
+      key: encryptionKey,
+    }
+  }
+
+  protected async deriveKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    const derivedKey = await this.crypto.pbkdf2(
+      password,
+      keyParams.content001.pw_salt,
+      keyParams.content001.pw_cost,
+      V001Algorithm.PbkdfOutputLength,
+    )
+
+    if (!derivedKey) {
+      throw Error('Error deriving PBKDF2 key')
+    }
+
+    const partitions = splitString(derivedKey, 2)
+
+    return CreateNewRootKey({
+      serverPassword: partitions[0],
+      masterKey: partitions[1],
+      version: ProtocolVersion.V001,
+      keyParams: keyParams.getPortableValue(),
+    })
+  }
+}
--- a/packages/encryption/src/Domain/Operator/002/Operator002.ts
+++ b/packages/encryption/src/Domain/Operator/002/Operator002.ts
@@ -0,0 +1,296 @@
+import { Create002KeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { SNProtocolOperator001 } from '../001/Operator001'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { UuidGenerator } from '@standardnotes/utils'
+import { V002Algorithm } from '../../Algorithm'
+import * as Common from '@standardnotes/common'
+import * as Models from '@standardnotes/models'
+import * as Utils from '@standardnotes/utils'
+import { DecryptedParameters, EncryptedParameters, ErrorDecryptingParameters } from '../../Types/EncryptedParameters'
+import { RootKeyEncryptedAuthenticatedData } from '../../Types/RootKeyEncryptedAuthenticatedData'
+import { ItemAuthenticatedData } from '../../Types/ItemAuthenticatedData'
+import { LegacyAttachedData } from '../../Types/LegacyAttachedData'
+import { isItemsKey } from '../../Keys/ItemsKey'
+import { CreateNewRootKey } from '../../Keys/RootKey/Functions'
+import { ItemContent, PayloadTimestampDefaults } from '@standardnotes/models'
+
+/**
+ * @deprecated
+ * A legacy operator no longer used to generate new accounts.
+ */
+export class SNProtocolOperator002 extends SNProtocolOperator001 {
+  override get version(): Common.ProtocolVersion {
+    return Common.ProtocolVersion.V002
+  }
+
+  protected override generateNewItemsKeyContent(): Models.ItemsKeyContent {
+    const keyLength = V002Algorithm.EncryptionKeyLength
+    const itemsKey = this.crypto.generateRandomKey(keyLength)
+    const authKey = this.crypto.generateRandomKey(keyLength)
+    const response = Models.FillItemContent<Models.ItemsKeyContent>({
+      itemsKey: itemsKey,
+      dataAuthenticationKey: authKey,
+      version: Common.ProtocolVersion.V002,
+    })
+    return response
+  }
+
+  /**
+   * Creates a new random items key to use for item encryption.
+   * The consumer must save/sync this item.
+   */
+  public override createItemsKey(): Models.ItemsKeyInterface {
+    const payload = new Models.DecryptedPayload({
+      uuid: UuidGenerator.GenerateUuid(),
+      content_type: Common.ContentType.ItemsKey,
+      content: this.generateNewItemsKeyContent(),
+      ...PayloadTimestampDefaults(),
+    })
+    return Models.CreateDecryptedItemFromPayload(payload)
+  }
+
+  public override async createRootKey(
+    identifier: string,
+    password: string,
+    origination: Common.KeyParamsOrigination,
+  ): Promise<SNRootKey> {
+    const pwCost = Utils.lastElement(V002Algorithm.PbkdfCostsUsed) as number
+    const pwNonce = this.crypto.generateRandomKey(V002Algorithm.SaltSeedLength)
+    const pwSalt = await this.crypto.unsafeSha1(identifier + ':' + pwNonce)
+
+    const keyParams = Create002KeyParams({
+      email: identifier,
+      pw_nonce: pwNonce,
+      pw_cost: pwCost,
+      pw_salt: pwSalt,
+      version: Common.ProtocolVersion.V002,
+      origination,
+      created: `${Date.now()}`,
+    })
+
+    return this.deriveKey(password, keyParams)
+  }
+
+  /**
+   * Note that version 002 supported "dynamic" iteration counts. Some accounts
+   * may have had costs of 5000, and others of 101000. Therefore, when computing
+   * the root key, we must use the value returned by the server.
+   */
+  public override async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    return this.deriveKey(password, keyParams)
+  }
+
+  private async decryptString002(text: string, key: string, iv: string) {
+    return this.crypto.aes256CbcDecrypt(text, iv, key)
+  }
+
+  private async encryptString002(text: string, key: string, iv: string) {
+    return this.crypto.aes256CbcEncrypt(text, iv, key)
+  }
+
+  /**
+   * @param keyParams Supplied only when encrypting an items key
+   */
+  private async encryptTextParams(
+    string: string,
+    encryptionKey: string,
+    authKey: string,
+    uuid: string,
+    version: Common.ProtocolVersion,
+    keyParams?: SNRootKeyParams,
+  ) {
+    const iv = this.crypto.generateRandomKey(V002Algorithm.EncryptionIvLength)
+    const contentCiphertext = await this.encryptString002(string, encryptionKey, iv)
+    const ciphertextToAuth = [version, uuid, iv, contentCiphertext].join(':')
+    const authHash = await this.crypto.hmac256(ciphertextToAuth, authKey)
+
+    if (!authHash) {
+      throw Error('Error generating hmac256 authHash')
+    }
+
+    const components: string[] = [version as string, authHash, uuid, iv, contentCiphertext]
+    if (keyParams) {
+      const keyParamsString = this.crypto.base64Encode(JSON.stringify(keyParams.content))
+      components.push(keyParamsString)
+    }
+    const fullCiphertext = components.join(':')
+    return fullCiphertext
+  }
+
+  private async decryptTextParams(
+    ciphertextToAuth: string,
+    contentCiphertext: string,
+    encryptionKey: string,
+    iv: string,
+    authHash: string,
+    authKey: string,
+  ) {
+    if (!encryptionKey) {
+      throw 'Attempting to decryptTextParams with null encryptionKey'
+    }
+    const localAuthHash = await this.crypto.hmac256(ciphertextToAuth, authKey)
+    if (!localAuthHash) {
+      throw Error('Error generating hmac256 localAuthHash')
+    }
+
+    if (this.crypto.timingSafeEqual(authHash, localAuthHash) === false) {
+      console.error(Error('Auth hash does not match.'))
+      return null
+    }
+    return this.decryptString002(contentCiphertext, encryptionKey, iv)
+  }
+
+  public override getPayloadAuthenticatedData(
+    encrypted: EncryptedParameters,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData | LegacyAttachedData | undefined {
+    const itemKeyComponents = this.encryptionComponentsFromString002(encrypted.enc_item_key)
+    const authenticatedData = itemKeyComponents.keyParams
+
+    if (!authenticatedData) {
+      return undefined
+    }
+
+    const decoded = JSON.parse(this.crypto.base64Decode(authenticatedData))
+    const data: LegacyAttachedData = {
+      ...(decoded as Common.AnyKeyParamsContent),
+    }
+    return data
+  }
+
+  public override async generateEncryptedParametersAsync(
+    payload: Models.DecryptedPayloadInterface,
+    key: Models.ItemsKeyInterface | SNRootKey,
+  ): Promise<EncryptedParameters> {
+    /**
+     * Generate new item key that is double the key size.
+     * Will be split to create encryption key and authentication key.
+     */
+    const itemKey = this.crypto.generateRandomKey(V002Algorithm.EncryptionKeyLength * 2)
+    const encItemKey = await this.encryptTextParams(
+      itemKey,
+      key.itemsKey,
+      key.dataAuthenticationKey as string,
+      payload.uuid,
+      key.keyVersion,
+      key instanceof SNRootKey ? (key as SNRootKey).keyParams : undefined,
+    )
+
+    const ek = Utils.firstHalfOfString(itemKey)
+    const ak = Utils.secondHalfOfString(itemKey)
+    const ciphertext = await this.encryptTextParams(
+      JSON.stringify(payload.content),
+      ek,
+      ak,
+      payload.uuid,
+      key.keyVersion,
+      key instanceof SNRootKey ? (key as SNRootKey).keyParams : undefined,
+    )
+
+    return {
+      uuid: payload.uuid,
+      items_key_id: isItemsKey(key) ? key.uuid : undefined,
+      content: ciphertext,
+      enc_item_key: encItemKey,
+      version: this.version,
+    }
+  }
+
+  public override async generateDecryptedParametersAsync<C extends ItemContent = ItemContent>(
+    encrypted: EncryptedParameters,
+    key: Models.ItemsKeyInterface | SNRootKey,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    if (!encrypted.enc_item_key) {
+      console.error(Error('Missing item encryption key, skipping decryption.'))
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    const encryptedItemKey = encrypted.enc_item_key
+    const itemKeyComponents = this.encryptionComponentsFromString002(
+      encryptedItemKey,
+      key.itemsKey,
+      key.dataAuthenticationKey,
+    )
+
+    const itemKey = await this.decryptTextParams(
+      itemKeyComponents.ciphertextToAuth,
+      itemKeyComponents.contentCiphertext,
+      itemKeyComponents.encryptionKey as string,
+      itemKeyComponents.iv,
+      itemKeyComponents.authHash,
+      itemKeyComponents.authKey as string,
+    )
+    if (!itemKey) {
+      console.error('Error decrypting item_key parameters', encrypted)
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    const ek = Utils.firstHalfOfString(itemKey)
+    const ak = Utils.secondHalfOfString(itemKey)
+    const itemParams = this.encryptionComponentsFromString002(encrypted.content, ek, ak)
+    const content = await this.decryptTextParams(
+      itemParams.ciphertextToAuth,
+      itemParams.contentCiphertext,
+      itemParams.encryptionKey as string,
+      itemParams.iv,
+      itemParams.authHash,
+      itemParams.authKey as string,
+    )
+
+    if (!content) {
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    } else {
+      return {
+        uuid: encrypted.uuid,
+        content: JSON.parse(content),
+      }
+    }
+  }
+
+  protected override async deriveKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    const derivedKey = await this.crypto.pbkdf2(
+      password,
+      keyParams.content002.pw_salt,
+      keyParams.content002.pw_cost,
+      V002Algorithm.PbkdfOutputLength,
+    )
+
+    if (!derivedKey) {
+      throw Error('Error deriving PBKDF2 key')
+    }
+
+    const partitions = Utils.splitString(derivedKey, 3)
+
+    return CreateNewRootKey({
+      serverPassword: partitions[0],
+      masterKey: partitions[1],
+      dataAuthenticationKey: partitions[2],
+      version: Common.ProtocolVersion.V002,
+      keyParams: keyParams.getPortableValue(),
+    })
+  }
+
+  private encryptionComponentsFromString002(string: string, encryptionKey?: string, authKey?: string) {
+    const components = string.split(':')
+    return {
+      encryptionVersion: components[0],
+      authHash: components[1],
+      uuid: components[2],
+      iv: components[3],
+      contentCiphertext: components[4],
+      keyParams: components[5],
+      ciphertextToAuth: [components[0], components[2], components[3], components[4]].join(':'),
+      encryptionKey: encryptionKey,
+      authKey: authKey,
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Operator/003/Operator003.ts
+++ b/packages/encryption/src/Domain/Operator/003/Operator003.ts
@@ -0,0 +1,111 @@
+import { splitString, UuidGenerator } from '@standardnotes/utils'
+import {
+  CreateDecryptedItemFromPayload,
+  DecryptedPayload,
+  ItemsKeyContent,
+  ItemsKeyInterface,
+  FillItemContent,
+  PayloadTimestampDefaults,
+} from '@standardnotes/models'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { V003Algorithm } from '../../Algorithm'
+import { Create003KeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { SNProtocolOperator002 } from '../002/Operator002'
+import { ContentType, KeyParamsOrigination, ProtocolVersion } from '@standardnotes/common'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { CreateNewRootKey } from '../../Keys/RootKey/Functions'
+
+/**
+ * @legacy
+ * Non-expired operator but no longer used for generating new accounts.
+ * This operator subclasses the 002 operator to share functionality that has not
+ * changed, and overrides functions where behavior may differ.
+ */
+export class SNProtocolOperator003 extends SNProtocolOperator002 {
+  override get version(): ProtocolVersion {
+    return ProtocolVersion.V003
+  }
+
+  protected override generateNewItemsKeyContent(): ItemsKeyContent {
+    const keyLength = V003Algorithm.EncryptionKeyLength
+    const itemsKey = this.crypto.generateRandomKey(keyLength)
+    const authKey = this.crypto.generateRandomKey(keyLength)
+    const response = FillItemContent<ItemsKeyContent>({
+      itemsKey: itemsKey,
+      dataAuthenticationKey: authKey,
+      version: ProtocolVersion.V003,
+    })
+    return response
+  }
+
+  /**
+   * Creates a new random items key to use for item encryption.
+   * The consumer must save/sync this item.
+   */
+  public override createItemsKey(): ItemsKeyInterface {
+    const content = this.generateNewItemsKeyContent()
+    const payload = new DecryptedPayload({
+      uuid: UuidGenerator.GenerateUuid(),
+      content_type: ContentType.ItemsKey,
+      content: FillItemContent(content),
+      ...PayloadTimestampDefaults(),
+    })
+    return CreateDecryptedItemFromPayload(payload)
+  }
+
+  public override async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    return this.deriveKey(password, keyParams)
+  }
+
+  protected override async deriveKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    const salt = await this.generateSalt(
+      keyParams.content003.identifier,
+      ProtocolVersion.V003,
+      V003Algorithm.PbkdfCost,
+      keyParams.content003.pw_nonce,
+    )
+
+    const derivedKey = await this.crypto.pbkdf2(
+      password,
+      salt,
+      V003Algorithm.PbkdfCost,
+      V003Algorithm.PbkdfOutputLength,
+    )
+
+    if (!derivedKey) {
+      throw Error('Error deriving PBKDF2 key')
+    }
+
+    const partitions = splitString(derivedKey, 3)
+
+    return CreateNewRootKey({
+      serverPassword: partitions[0],
+      masterKey: partitions[1],
+      dataAuthenticationKey: partitions[2],
+      version: ProtocolVersion.V003,
+      keyParams: keyParams.getPortableValue(),
+    })
+  }
+
+  public override async createRootKey(
+    identifier: string,
+    password: string,
+    origination: KeyParamsOrigination,
+  ): Promise<SNRootKey> {
+    const version = ProtocolVersion.V003
+    const pwNonce = this.crypto.generateRandomKey(V003Algorithm.SaltSeedLength)
+    const keyParams = Create003KeyParams({
+      identifier: identifier,
+      pw_nonce: pwNonce,
+      version: version,
+      origination: origination,
+      created: `${Date.now()}`,
+    })
+    return this.deriveKey(password, keyParams)
+  }
+
+  private async generateSalt(identifier: string, version: ProtocolVersion, cost: number, nonce: string) {
+    const result = await this.crypto.sha256([identifier, 'SF', version, cost, nonce].join(':'))
+    return result
+  }
+}
--- a/packages/encryption/src/Domain/Operator/004/Operator004.spec.ts
+++ b/packages/encryption/src/Domain/Operator/004/Operator004.spec.ts
@@ -0,0 +1,96 @@
+import { ContentType, ProtocolVersion } from '@standardnotes/common'
+import { DecryptedPayload, ItemContent, ItemsKeyContent, PayloadTimestampDefaults } from '@standardnotes/models'
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { SNItemsKey } from '../../Keys/ItemsKey'
+import { ItemAuthenticatedData } from '../../Types/ItemAuthenticatedData'
+import { SNProtocolOperator004 } from './Operator004'
+
+const b64 = (text: string): string => {
+  return Buffer.from(text).toString('base64')
+}
+
+describe('operator 004', () => {
+  let crypto: PureCryptoInterface
+  let operator: SNProtocolOperator004
+
+  beforeEach(() => {
+    crypto = {} as jest.Mocked<PureCryptoInterface>
+    crypto.base64Encode = jest.fn().mockImplementation((text: string) => {
+      return b64(text)
+    })
+    crypto.base64Decode = jest.fn().mockImplementation((text: string) => {
+      return Buffer.from(text, 'base64').toString('ascii')
+    })
+    crypto.xchacha20Encrypt = jest.fn().mockImplementation((text: string) => {
+      return `<e>${text}<e>`
+    })
+    crypto.xchacha20Decrypt = jest.fn().mockImplementation((text: string) => {
+      return text.split('<e>')[1]
+    })
+    crypto.generateRandomKey = jest.fn().mockImplementation(() => {
+      return 'random-string'
+    })
+
+    operator = new SNProtocolOperator004(crypto)
+  })
+
+  it('should generateEncryptedProtocolString', () => {
+    const aad: ItemAuthenticatedData = {
+      u: '123',
+      v: ProtocolVersion.V004,
+    }
+
+    const nonce = 'noncy'
+    const plaintext = 'foo'
+
+    operator.generateEncryptionNonce = jest.fn().mockReturnValue(nonce)
+
+    const result = operator.generateEncryptedProtocolString(plaintext, 'secret', aad)
+
+    expect(result).toEqual(`004:${nonce}:<e>${plaintext}<e>:${b64(JSON.stringify(aad))}`)
+  })
+
+  it('should deconstructEncryptedPayloadString', () => {
+    const string = '004:noncy:<e>foo<e>:eyJ1IjoiMTIzIiwidiI6IjAwNCJ9'
+
+    const result = operator.deconstructEncryptedPayloadString(string)
+
+    expect(result).toEqual({
+      version: '004',
+      nonce: 'noncy',
+      ciphertext: '<e>foo<e>',
+      authenticatedData: 'eyJ1IjoiMTIzIiwidiI6IjAwNCJ9',
+    })
+  })
+
+  it('should generateEncryptedParametersSync', () => {
+    const payload = {
+      uuid: '123',
+      content_type: ContentType.Note,
+      content: { foo: 'bar' } as unknown as jest.Mocked<ItemContent>,
+      ...PayloadTimestampDefaults(),
+    } as jest.Mocked<DecryptedPayload>
+
+    const key = new SNItemsKey(
+      new DecryptedPayload<ItemsKeyContent>({
+        uuid: 'key-456',
+        content_type: ContentType.ItemsKey,
+        content: {
+          itemsKey: 'secret',
+          version: ProtocolVersion.V004,
+        } as jest.Mocked<ItemsKeyContent>,
+        ...PayloadTimestampDefaults(),
+      }),
+    )
+
+    const result = operator.generateEncryptedParametersSync(payload, key)
+
+    expect(result).toEqual({
+      uuid: '123',
+      items_key_id: 'key-456',
+      content: '004:random-string:<e>{"foo":"bar"}<e>:eyJ1IjoiMTIzIiwidiI6IjAwNCJ9',
+      enc_item_key: '004:random-string:<e>random-string<e>:eyJ1IjoiMTIzIiwidiI6IjAwNCJ9',
+      version: '004',
+    })
+  })
+})
--- a/packages/encryption/src/Domain/Operator/004/Operator004.ts
+++ b/packages/encryption/src/Domain/Operator/004/Operator004.ts
@@ -0,0 +1,319 @@
+import { ContentType, KeyParamsOrigination, ProtocolVersion } from '@standardnotes/common'
+import { Create004KeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { SynchronousOperator } from '../Operator'
+import {
+  CreateDecryptedItemFromPayload,
+  FillItemContent,
+  ItemContent,
+  ItemsKeyContent,
+  ItemsKeyInterface,
+  PayloadTimestampDefaults,
+} from '@standardnotes/models'
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { V004Algorithm } from '../../Algorithm'
+import * as Models from '@standardnotes/models'
+import * as Utils from '@standardnotes/utils'
+import { ContentTypeUsesRootKeyEncryption, CreateNewRootKey } from '../../Keys/RootKey/Functions'
+import { DecryptedParameters, EncryptedParameters, ErrorDecryptingParameters } from '../../Types/EncryptedParameters'
+import { RootKeyEncryptedAuthenticatedData } from '../../Types/RootKeyEncryptedAuthenticatedData'
+import { ItemAuthenticatedData } from '../../Types/ItemAuthenticatedData'
+import { LegacyAttachedData } from '../../Types/LegacyAttachedData'
+import { isItemsKey } from '../../Keys/ItemsKey'
+
+type V004StringComponents = [version: string, nonce: string, ciphertext: string, authenticatedData: string]
+
+type V004Components = {
+  version: V004StringComponents[0]
+  nonce: V004StringComponents[1]
+  ciphertext: V004StringComponents[2]
+  authenticatedData: V004StringComponents[3]
+}
+
+const PARTITION_CHARACTER = ':'
+
+export class SNProtocolOperator004 implements SynchronousOperator {
+  protected readonly crypto: PureCryptoInterface
+
+  constructor(crypto: PureCryptoInterface) {
+    this.crypto = crypto
+  }
+
+  public getEncryptionDisplayName(): string {
+    return 'XChaCha20-Poly1305'
+  }
+
+  get version(): ProtocolVersion {
+    return ProtocolVersion.V004
+  }
+
+  private generateNewItemsKeyContent() {
+    const itemsKey = this.crypto.generateRandomKey(V004Algorithm.EncryptionKeyLength)
+    const response = FillItemContent<ItemsKeyContent>({
+      itemsKey: itemsKey,
+      version: ProtocolVersion.V004,
+    })
+    return response
+  }
+
+  /**
+   * Creates a new random items key to use for item encryption.
+   * The consumer must save/sync this item.
+   */
+  public createItemsKey(): ItemsKeyInterface {
+    const payload = new Models.DecryptedPayload({
+      uuid: Utils.UuidGenerator.GenerateUuid(),
+      content_type: ContentType.ItemsKey,
+      content: this.generateNewItemsKeyContent(),
+      ...PayloadTimestampDefaults(),
+    })
+    return CreateDecryptedItemFromPayload(payload)
+  }
+
+  /**
+   * We require both a client-side component and a server-side component in generating a
+   * salt. This way, a comprimised server cannot benefit from sending the same seed value
+   * for every user. We mix a client-controlled value that is globally unique
+   * (their identifier), with a server controlled value to produce a salt for our KDF.
+   * @param identifier
+   * @param seed
+   */
+  private async generateSalt004(identifier: string, seed: string) {
+    const hash = await this.crypto.sha256([identifier, seed].join(PARTITION_CHARACTER))
+    return Utils.truncateHexString(hash, V004Algorithm.ArgonSaltLength)
+  }
+
+  /**
+   * Computes a root key given a passworf
+   * qwd and previous keyParams
+   * @param password - Plain string representing raw user password
+   * @param keyParams - KeyParams object
+   */
+  public async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    return this.deriveKey(password, keyParams)
+  }
+
+  /**
+   * Creates a new root key given an identifier and a user password
+   * @param identifier - Plain string representing a unique identifier
+   * @param password - Plain string representing raw user password
+   */
+  public async createRootKey(
+    identifier: string,
+    password: string,
+    origination: KeyParamsOrigination,
+  ): Promise<SNRootKey> {
+    const version = ProtocolVersion.V004
+    const seed = this.crypto.generateRandomKey(V004Algorithm.ArgonSaltSeedLength)
+    const keyParams = Create004KeyParams({
+      identifier: identifier,
+      pw_nonce: seed,
+      version: version,
+      origination: origination,
+      created: `${Date.now()}`,
+    })
+    return this.deriveKey(password, keyParams)
+  }
+
+  /**
+   * @param plaintext - The plaintext to encrypt.
+   * @param rawKey - The key to use to encrypt the plaintext.
+   * @param nonce - The nonce for encryption.
+   * @param authenticatedData - JavaScript object (will be stringified) representing
+                'Additional authenticated data': data you want to be included in authentication.
+   */
+  encryptString004(plaintext: string, rawKey: string, nonce: string, authenticatedData: ItemAuthenticatedData) {
+    if (!nonce) {
+      throw 'encryptString null nonce'
+    }
+    if (!rawKey) {
+      throw 'encryptString null rawKey'
+    }
+    return this.crypto.xchacha20Encrypt(plaintext, nonce, rawKey, this.authenticatedDataToString(authenticatedData))
+  }
+
+  /**
+   * @param ciphertext  The encrypted text to decrypt.
+   * @param rawKey  The key to use to decrypt the ciphertext.
+   * @param nonce  The nonce for decryption.
+   * @param rawAuthenticatedData String representing
+                'Additional authenticated data' - data you want to be included in authentication.
+   */
+  private decryptString004(ciphertext: string, rawKey: string, nonce: string, rawAuthenticatedData: string) {
+    return this.crypto.xchacha20Decrypt(ciphertext, nonce, rawKey, rawAuthenticatedData)
+  }
+
+  generateEncryptionNonce(): string {
+    return this.crypto.generateRandomKey(V004Algorithm.EncryptionNonceLength)
+  }
+
+  /**
+   * @param plaintext  The plaintext text to decrypt.
+   * @param rawKey  The key to use to encrypt the plaintext.
+   */
+  generateEncryptedProtocolString(plaintext: string, rawKey: string, authenticatedData: ItemAuthenticatedData) {
+    const nonce = this.generateEncryptionNonce()
+
+    const ciphertext = this.encryptString004(plaintext, rawKey, nonce, authenticatedData)
+
+    const components: V004StringComponents = [
+      ProtocolVersion.V004 as string,
+      nonce,
+      ciphertext,
+      this.authenticatedDataToString(authenticatedData),
+    ]
+
+    return components.join(PARTITION_CHARACTER)
+  }
+
+  deconstructEncryptedPayloadString(payloadString: string): V004Components {
+    const components = payloadString.split(PARTITION_CHARACTER) as V004StringComponents
+
+    return {
+      version: components[0],
+      nonce: components[1],
+      ciphertext: components[2],
+      authenticatedData: components[3],
+    }
+  }
+
+  public getPayloadAuthenticatedData(
+    encrypted: EncryptedParameters,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData | LegacyAttachedData | undefined {
+    const itemKeyComponents = this.deconstructEncryptedPayloadString(encrypted.enc_item_key)
+    const authenticatedDataString = itemKeyComponents.authenticatedData
+    const result = this.stringToAuthenticatedData(authenticatedDataString)
+
+    return result
+  }
+
+  /**
+   * For items that are encrypted with a root key, we append the root key's key params, so
+   * that in the event the client/user loses a reference to their root key, they may still
+   * decrypt data by regenerating the key based on the attached key params.
+   */
+  private generateAuthenticatedDataForPayload(
+    payload: Models.DecryptedPayloadInterface,
+    key: ItemsKeyInterface | SNRootKey,
+  ): ItemAuthenticatedData | RootKeyEncryptedAuthenticatedData {
+    const baseData: ItemAuthenticatedData = {
+      u: payload.uuid,
+      v: ProtocolVersion.V004,
+    }
+    if (ContentTypeUsesRootKeyEncryption(payload.content_type)) {
+      return {
+        ...baseData,
+        kp: (key as SNRootKey).keyParams.content,
+      }
+    } else {
+      if (!isItemsKey(key)) {
+        throw Error('Attempting to use non-items key for regular item.')
+      }
+      return baseData
+    }
+  }
+
+  private authenticatedDataToString(attachedData: ItemAuthenticatedData) {
+    return this.crypto.base64Encode(JSON.stringify(Utils.sortedCopy(Utils.omitUndefinedCopy(attachedData))))
+  }
+
+  private stringToAuthenticatedData(
+    rawAuthenticatedData: string,
+    override?: Partial<ItemAuthenticatedData>,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData {
+    const base = JSON.parse(this.crypto.base64Decode(rawAuthenticatedData))
+    return Utils.sortedCopy({
+      ...base,
+      ...override,
+    })
+  }
+
+  public generateEncryptedParametersSync(
+    payload: Models.DecryptedPayloadInterface,
+    key: ItemsKeyInterface | SNRootKey,
+  ): EncryptedParameters {
+    const itemKey = this.crypto.generateRandomKey(V004Algorithm.EncryptionKeyLength)
+
+    const contentPlaintext = JSON.stringify(payload.content)
+    const authenticatedData = this.generateAuthenticatedDataForPayload(payload, key)
+    const encryptedContentString = this.generateEncryptedProtocolString(contentPlaintext, itemKey, authenticatedData)
+
+    const encryptedItemKey = this.generateEncryptedProtocolString(itemKey, key.itemsKey, authenticatedData)
+
+    return {
+      uuid: payload.uuid,
+      items_key_id: isItemsKey(key) ? key.uuid : undefined,
+      content: encryptedContentString,
+      enc_item_key: encryptedItemKey,
+      version: this.version,
+    }
+  }
+
+  public generateDecryptedParametersSync<C extends ItemContent = ItemContent>(
+    encrypted: EncryptedParameters,
+    key: ItemsKeyInterface | SNRootKey,
+  ): DecryptedParameters<C> | ErrorDecryptingParameters {
+    const itemKeyComponents = this.deconstructEncryptedPayloadString(encrypted.enc_item_key)
+    const authenticatedData = this.stringToAuthenticatedData(itemKeyComponents.authenticatedData, {
+      u: encrypted.uuid,
+      v: encrypted.version,
+    })
+
+    const useAuthenticatedString = this.authenticatedDataToString(authenticatedData)
+    const itemKey = this.decryptString004(
+      itemKeyComponents.ciphertext,
+      key.itemsKey,
+      itemKeyComponents.nonce,
+      useAuthenticatedString,
+    )
+
+    if (!itemKey) {
+      console.error('Error decrypting itemKey parameters', encrypted)
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    const contentComponents = this.deconstructEncryptedPayloadString(encrypted.content)
+    const content = this.decryptString004(
+      contentComponents.ciphertext,
+      itemKey,
+      contentComponents.nonce,
+      useAuthenticatedString,
+    )
+    if (!content) {
+      return {
+        uuid: encrypted.uuid,
+        errorDecrypting: true,
+      }
+    } else {
+      return {
+        uuid: encrypted.uuid,
+        content: JSON.parse(content),
+      }
+    }
+  }
+
+  private async deriveKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey> {
+    const salt = await this.generateSalt004(keyParams.content004.identifier, keyParams.content004.pw_nonce)
+    const derivedKey = this.crypto.argon2(
+      password,
+      salt,
+      V004Algorithm.ArgonIterations,
+      V004Algorithm.ArgonMemLimit,
+      V004Algorithm.ArgonOutputKeyBytes,
+    )
+    const partitions = Utils.splitString(derivedKey, 2)
+    const masterKey = partitions[0]
+    const serverPassword = partitions[1]
+
+    return CreateNewRootKey({
+      masterKey,
+      serverPassword,
+      version: ProtocolVersion.V004,
+      keyParams: keyParams.getPortableValue(),
+    })
+  }
+}
--- a/packages/encryption/src/Domain/Operator/Functions.ts
+++ b/packages/encryption/src/Domain/Operator/Functions.ts
@@ -0,0 +1,30 @@
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { SNProtocolOperator001 } from '../Operator/001/Operator001'
+import { SNProtocolOperator002 } from '../Operator/002/Operator002'
+import { SNProtocolOperator003 } from '../Operator/003/Operator003'
+import { SNProtocolOperator004 } from '../Operator/004/Operator004'
+import { AsynchronousOperator, SynchronousOperator } from '../Operator/Operator'
+import { ProtocolVersion } from '@standardnotes/common'
+
+export function createOperatorForVersion(
+  version: ProtocolVersion,
+  crypto: PureCryptoInterface,
+): AsynchronousOperator | SynchronousOperator {
+  if (version === ProtocolVersion.V001) {
+    return new SNProtocolOperator001(crypto)
+  } else if (version === ProtocolVersion.V002) {
+    return new SNProtocolOperator002(crypto)
+  } else if (version === ProtocolVersion.V003) {
+    return new SNProtocolOperator003(crypto)
+  } else if (version === ProtocolVersion.V004) {
+    return new SNProtocolOperator004(crypto)
+  } else {
+    throw Error(`Unable to find operator for version ${version}`)
+  }
+}
+
+export function isAsyncOperator(
+  operator: AsynchronousOperator | SynchronousOperator,
+): operator is AsynchronousOperator {
+  return (operator as AsynchronousOperator).generateDecryptedParametersAsync !== undefined
+}
--- a/packages/encryption/src/Domain/Operator/Operator.ts
+++ b/packages/encryption/src/Domain/Operator/Operator.ts
@@ -0,0 +1,86 @@
+import { ItemsKeyInterface, RootKeyInterface } from '@standardnotes/models'
+import * as Models from '@standardnotes/models'
+import { SNRootKey } from '../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../Keys/RootKey/RootKeyParams'
+import { KeyParamsOrigination } from '@standardnotes/common'
+import { DecryptedParameters, EncryptedParameters, ErrorDecryptingParameters } from '../Types/EncryptedParameters'
+import { RootKeyEncryptedAuthenticatedData } from '../Types/RootKeyEncryptedAuthenticatedData'
+import { ItemAuthenticatedData } from '../Types/ItemAuthenticatedData'
+import { LegacyAttachedData } from '../Types/LegacyAttachedData'
+
+/**w
+ * An operator is responsible for performing crypto operations, such as generating keys
+ * and encrypting/decrypting payloads. Operators interact directly with
+ * platform dependent SNPureCrypto implementation to directly access cryptographic primitives.
+ * Each operator is versioned according to the protocol version. Functions that are common
+ * across all versions appear in this generic parent class.
+ */
+export interface OperatorCommon {
+  createItemsKey(): ItemsKeyInterface
+  /**
+   * Returns encryption protocol display name
+   */
+  getEncryptionDisplayName(): string
+
+  readonly version: string
+
+  /**
+   * Returns the payload's authenticated data. The passed payload must be in a
+   * non-decrypted, ciphertext state.
+   */
+  getPayloadAuthenticatedData(
+    encrypted: EncryptedParameters,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData | LegacyAttachedData | undefined
+
+  /**
+   * Computes a root key given a password and previous keyParams
+   * @param password - Plain string representing raw user password
+   */
+  computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<SNRootKey>
+
+  /**
+   * Creates a new root key given an identifier and a user password
+   * @param identifier - Plain string representing a unique identifier
+   *    for the user
+   * @param password - Plain string representing raw user password
+   */
+  createRootKey(identifier: string, password: string, origination: KeyParamsOrigination): Promise<SNRootKey>
+}
+
+export interface SynchronousOperator extends OperatorCommon {
+  /**
+   * Converts a bare payload into an encrypted one in the desired format.
+   * @param payload - The non-encrypted payload object to encrypt
+   * @param key - The key to use to encrypt the payload. Can be either
+   *  a RootKey (when encrypting payloads that require root key encryption, such as encrypting
+   * items keys), or an ItemsKey (if encrypted regular items)
+   */
+  generateEncryptedParametersSync(
+    payload: Models.DecryptedPayloadInterface,
+    key: ItemsKeyInterface | RootKeyInterface,
+  ): EncryptedParameters
+
+  generateDecryptedParametersSync<C extends Models.ItemContent = Models.ItemContent>(
+    encrypted: EncryptedParameters,
+    key: ItemsKeyInterface | RootKeyInterface,
+  ): DecryptedParameters<C> | ErrorDecryptingParameters
+}
+
+export interface AsynchronousOperator extends OperatorCommon {
+  /**
+   * Converts a bare payload into an encrypted one in the desired format.
+   * @param payload - The non-encrypted payload object to encrypt
+   * @param key - The key to use to encrypt the payload. Can be either
+   *  a RootKey (when encrypting payloads that require root key encryption, such as encrypting
+   * items keys), or an ItemsKey (if encrypted regular items)
+   */
+  generateEncryptedParametersAsync(
+    payload: Models.DecryptedPayloadInterface,
+    key: ItemsKeyInterface | RootKeyInterface,
+  ): Promise<EncryptedParameters>
+
+  generateDecryptedParametersAsync<C extends Models.ItemContent = Models.ItemContent>(
+    encrypted: EncryptedParameters,
+    key: ItemsKeyInterface | RootKeyInterface,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters>
+}
--- a/packages/encryption/src/Domain/Operator/OperatorManager.ts
+++ b/packages/encryption/src/Domain/Operator/OperatorManager.ts
@@ -0,0 +1,34 @@
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { ProtocolVersion, ProtocolVersionLatest } from '@standardnotes/common'
+import { createOperatorForVersion } from './Functions'
+import { AsynchronousOperator, SynchronousOperator } from './Operator'
+
+export class OperatorManager {
+  private operators: Record<string, AsynchronousOperator | SynchronousOperator> = {}
+
+  constructor(private crypto: PureCryptoInterface) {
+    this.crypto = crypto
+  }
+
+  public deinit(): void {
+    ;(this.crypto as unknown) = undefined
+    this.operators = {}
+  }
+
+  public operatorForVersion(version: ProtocolVersion): SynchronousOperator | AsynchronousOperator {
+    const operatorKey = version
+    let operator = this.operators[operatorKey]
+    if (!operator) {
+      operator = createOperatorForVersion(version, this.crypto)
+      this.operators[operatorKey] = operator
+    }
+    return operator
+  }
+
+  /**
+   * Returns the operator corresponding to the latest protocol version
+   */
+  public defaultOperator(): SynchronousOperator | AsynchronousOperator {
+    return this.operatorForVersion(ProtocolVersionLatest)
+  }
+}
--- a/packages/encryption/src/Domain/Operator/OperatorWrapper.ts
+++ b/packages/encryption/src/Domain/Operator/OperatorWrapper.ts
@@ -0,0 +1,52 @@
+import { isAsyncOperator } from './Functions'
+import { OperatorManager } from './OperatorManager'
+import * as Models from '@standardnotes/models'
+import {
+  DecryptedParameters,
+  EncryptedParameters,
+  encryptedParametersFromPayload,
+  ErrorDecryptingParameters,
+} from '../Types/EncryptedParameters'
+
+export async function encryptPayload(
+  payload: Models.DecryptedPayloadInterface,
+  key: Models.ItemsKeyInterface | Models.RootKeyInterface,
+  operatorManager: OperatorManager,
+): Promise<EncryptedParameters> {
+  const operator = operatorManager.operatorForVersion(key.keyVersion)
+  let encryptionParameters
+
+  if (isAsyncOperator(operator)) {
+    encryptionParameters = await operator.generateEncryptedParametersAsync(payload, key)
+  } else {
+    encryptionParameters = operator.generateEncryptedParametersSync(payload, key)
+  }
+
+  if (!encryptionParameters) {
+    throw 'Unable to generate encryption parameters'
+  }
+
+  return encryptionParameters
+}
+
+export async function decryptPayload<C extends Models.ItemContent = Models.ItemContent>(
+  payload: Models.EncryptedPayloadInterface,
+  key: Models.ItemsKeyInterface | Models.RootKeyInterface,
+  operatorManager: OperatorManager,
+): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+  const operator = operatorManager.operatorForVersion(payload.version)
+
+  try {
+    if (isAsyncOperator(operator)) {
+      return await operator.generateDecryptedParametersAsync(encryptedParametersFromPayload(payload), key)
+    } else {
+      return operator.generateDecryptedParametersSync(encryptedParametersFromPayload(payload), key)
+    }
+  } catch (e) {
+    console.error('Error decrypting payload', payload, e)
+    return {
+      uuid: payload.uuid,
+      errorDecrypting: true,
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Operator/index.ts
+++ b/packages/encryption/src/Domain/Operator/index.ts
@@ -0,0 +1,9 @@
+export * from './001/Operator001'
+export * from './002/Operator002'
+export * from './003/Operator003'
+export * from './004/Operator004'
+export * from './Operator'
+export * from '../Types/EncryptedParameters'
+export * from '../Types/ItemAuthenticatedData'
+export * from '../Types/LegacyAttachedData'
+export * from '../Types/RootKeyEncryptedAuthenticatedData'
--- a/packages/encryption/src/Domain/Service/Encryption/EncryptionProvider.ts
+++ b/packages/encryption/src/Domain/Service/Encryption/EncryptionProvider.ts
@@ -0,0 +1,53 @@
+import { ProtocolVersion } from '@standardnotes/common'
+import {
+  DecryptedPayloadInterface,
+  EncryptedPayloadInterface,
+  ItemContent,
+  RootKeyInterface,
+} from '@standardnotes/models'
+import { ClientDisplayableError } from '@standardnotes/responses'
+import { BackupFile } from '../../Backups/BackupFile'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { KeyedDecryptionSplit, KeyedEncryptionSplit } from '../../Split/EncryptionSplit'
+
+export interface EncryptionProvider {
+  encryptSplitSingle(split: KeyedEncryptionSplit): Promise<EncryptedPayloadInterface>
+
+  encryptSplit(split: KeyedEncryptionSplit): Promise<EncryptedPayloadInterface[]>
+
+  decryptSplitSingle<
+    C extends ItemContent = ItemContent,
+    P extends DecryptedPayloadInterface<C> = DecryptedPayloadInterface<C>,
+  >(
+    split: KeyedDecryptionSplit,
+  ): Promise<P | EncryptedPayloadInterface>
+
+  decryptSplit<
+    C extends ItemContent = ItemContent,
+    P extends DecryptedPayloadInterface<C> = DecryptedPayloadInterface<C>,
+  >(
+    split: KeyedDecryptionSplit,
+  ): Promise<(P | EncryptedPayloadInterface)[]>
+
+  hasRootKeyEncryptionSource(): boolean
+
+  getKeyEmbeddedKeyParams(key: EncryptedPayloadInterface): SNRootKeyParams | undefined
+
+  computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<RootKeyInterface>
+
+  /**
+   * @returns The versions that this library supports.
+   */
+  supportedVersions(): ProtocolVersion[]
+
+  getUserVersion(): ProtocolVersion | undefined
+
+  /**
+   * Decrypts a backup file using user-inputted password
+   * @param password - The raw user password associated with this backup file
+   */
+  decryptBackupFile(
+    file: BackupFile,
+    password?: string,
+  ): Promise<ClientDisplayableError | (EncryptedPayloadInterface | DecryptedPayloadInterface)[]>
+}
--- a/packages/encryption/src/Domain/Service/Encryption/EncryptionService.ts
+++ b/packages/encryption/src/Domain/Service/Encryption/EncryptionService.ts
@@ -0,0 +1,751 @@
+import { BackupFile } from '../../Backups/BackupFile'
+import { CreateAnyKeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { DecryptBackupFile } from '../../Backups/BackupFileDecryptor'
+import { EncryptionProvider } from './EncryptionProvider'
+import { findDefaultItemsKey } from '../Functions'
+import { ItemsEncryptionService } from '../Items/ItemsEncryption'
+import { KeyMode } from '../RootKey/KeyMode'
+import { OperatorManager } from '../../Operator/OperatorManager'
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { V001Algorithm, V002Algorithm } from '../../Algorithm'
+import * as Common from '@standardnotes/common'
+import {
+  CreateEncryptionSplitWithKeyLookup,
+  FindPayloadInDecryptionSplit,
+  FindPayloadInEncryptionSplit,
+  KeyedDecryptionSplit,
+  KeyedEncryptionSplit,
+} from '../../Split/EncryptionSplit'
+import * as Models from '@standardnotes/models'
+import * as RootKeyEncryption from '../RootKey/RootKeyEncryption'
+import * as Services from '@standardnotes/services'
+import * as Utils from '@standardnotes/utils'
+import {
+  DecryptedParameters,
+  EncryptedParameters,
+  ErrorDecryptingParameters,
+  isErrorDecryptingParameters,
+  encryptedParametersFromPayload,
+} from '../../Types/EncryptedParameters'
+import { RootKeyEncryptedAuthenticatedData } from '../../Types/RootKeyEncryptedAuthenticatedData'
+import { ItemAuthenticatedData } from '../../Types/ItemAuthenticatedData'
+import { LegacyAttachedData } from '../../Types/LegacyAttachedData'
+import {
+  CreateDecryptedBackupFileContextPayload,
+  CreateEncryptedBackupFileContextPayload,
+  EncryptedPayload,
+  isDecryptedPayload,
+  isEncryptedPayload,
+  RootKeyInterface,
+} from '@standardnotes/models'
+import { SplitPayloadsByEncryptionType } from '../../Split/EncryptionTypeSplit'
+import { ClientDisplayableError } from '@standardnotes/responses'
+import { isNotUndefined } from '@standardnotes/utils'
+import { DiagnosticInfo } from '@standardnotes/services'
+
+export enum EncryptionServiceEvent {
+  RootKeyStatusChanged = 'RootKeyStatusChanged',
+}
+
+/**
+ * The encryption service is responsible for the encryption and decryption of payloads, and
+ * handles delegation of a task to the respective protocol operator. Each version of the protocol
+ * (001, 002, 003, 004, etc) uses a respective operator version to perform encryption operations.
+ * Operators are located in /protocol/operator.
+ * The protocol service depends on the keyManager for determining which key to use for the
+ * encryption and decryption of a particular payload.
+ * The protocol service is also responsible for dictating which protocol versions are valid,
+ * and which are no longer valid or not supported.
+
+ * The key manager is responsible for managing root key and root key wrapper states.
+ * When the key manager is initialized, it initiates itself with a keyMode, which
+ * dictates the entire flow of key management. The key manager's responsibilities include:
+ * - interacting with the device keychain to save or clear the root key
+ * - interacting with storage to save root key params or wrapper params, or the wrapped root key.
+ * - exposing methods that allow the application to unwrap the root key (unlock the application)
+ *
+ * It also exposes two primary methods for determining what key should be used to encrypt
+ * or decrypt a particular payload. Some payloads are encrypted directly with the rootKey
+ * (such as itemsKeys and encryptedStorage). Others are encrypted with itemsKeys (notes, tags, etc).
+
+ * The items key manager manages the lifecycle of items keys.
+ * It is responsible for creating the default items key when conditions call for it
+ * (such as after the first sync completes and no key exists).
+ * It also exposes public methods that allows consumers to retrieve an items key
+ * for a particular payload, and also retrieve all available items keys.
+*/
+export class EncryptionService extends Services.AbstractService<EncryptionServiceEvent> implements EncryptionProvider {
+  private operatorManager: OperatorManager
+  private readonly itemsEncryption: ItemsEncryptionService
+  private readonly rootKeyEncryption: RootKeyEncryption.RootKeyEncryptionService
+  private rootKeyObserverDisposer: () => void
+
+  constructor(
+    private itemManager: Services.ItemManagerInterface,
+    private payloadManager: Services.PayloadManagerInterface,
+    public deviceInterface: Services.DeviceInterface,
+    private storageService: Services.StorageServiceInterface,
+    private identifier: Common.ApplicationIdentifier,
+    public crypto: PureCryptoInterface,
+    protected override internalEventBus: Services.InternalEventBusInterface,
+  ) {
+    super(internalEventBus)
+    this.crypto = crypto
+
+    this.operatorManager = new OperatorManager(crypto)
+
+    this.itemsEncryption = new ItemsEncryptionService(
+      itemManager,
+      payloadManager,
+      storageService,
+      this.operatorManager,
+      internalEventBus,
+    )
+
+    this.rootKeyEncryption = new RootKeyEncryption.RootKeyEncryptionService(
+      this.itemManager,
+      this.operatorManager,
+      this.deviceInterface,
+      this.storageService,
+      this.identifier,
+      this.internalEventBus,
+    )
+    this.rootKeyObserverDisposer = this.rootKeyEncryption.addEventObserver((event) => {
+      this.itemsEncryption.userVersion = this.getUserVersion()
+      if (event === RootKeyEncryption.RootKeyServiceEvent.RootKeyStatusChanged) {
+        void this.notifyEvent(EncryptionServiceEvent.RootKeyStatusChanged)
+      }
+    })
+
+    Utils.UuidGenerator.SetGenerator(this.crypto.generateUUID)
+  }
+
+  public override deinit(): void {
+    ;(this.itemManager as unknown) = undefined
+    ;(this.payloadManager as unknown) = undefined
+    ;(this.deviceInterface as unknown) = undefined
+    ;(this.storageService as unknown) = undefined
+    ;(this.crypto as unknown) = undefined
+    ;(this.operatorManager as unknown) = undefined
+
+    this.rootKeyObserverDisposer()
+    ;(this.rootKeyObserverDisposer as unknown) = undefined
+
+    this.itemsEncryption.deinit()
+    ;(this.itemsEncryption as unknown) = undefined
+
+    this.rootKeyEncryption.deinit()
+    ;(this.rootKeyEncryption as unknown) = undefined
+
+    super.deinit()
+  }
+
+  public async initialize() {
+    await this.rootKeyEncryption.initialize()
+  }
+
+  /**
+   * Returns encryption protocol display name for active account/wrapper
+   */
+  public async getEncryptionDisplayName(): Promise<string> {
+    const version = await this.rootKeyEncryption.getEncryptionSourceVersion()
+
+    if (version) {
+      return this.operatorManager.operatorForVersion(version).getEncryptionDisplayName()
+    }
+
+    throw Error('Attempting to access encryption display name wtihout source')
+  }
+
+  public getLatestVersion() {
+    return Common.ProtocolVersionLatest
+  }
+
+  public hasAccount() {
+    return this.rootKeyEncryption.hasAccount()
+  }
+
+  public hasRootKeyEncryptionSource(): boolean {
+    return this.rootKeyEncryption.hasRootKeyEncryptionSource()
+  }
+
+  public getUserVersion(): Common.ProtocolVersion | undefined {
+    return this.rootKeyEncryption.getUserVersion()
+  }
+
+  public async upgradeAvailable() {
+    const accountUpgradeAvailable = this.accountUpgradeAvailable()
+    const passcodeUpgradeAvailable = await this.passcodeUpgradeAvailable()
+    return accountUpgradeAvailable || passcodeUpgradeAvailable
+  }
+
+  public getSureDefaultItemsKey(): Models.ItemsKeyInterface {
+    return this.itemsEncryption.getDefaultItemsKey() as Models.ItemsKeyInterface
+  }
+
+  async repersistAllItems(): Promise<void> {
+    return this.itemsEncryption.repersistAllItems()
+  }
+
+  public async reencryptItemsKeys(): Promise<void> {
+    await this.rootKeyEncryption.reencryptItemsKeys()
+  }
+
+  public async createNewItemsKeyWithRollback(): Promise<() => Promise<void>> {
+    return this.rootKeyEncryption.createNewItemsKeyWithRollback()
+  }
+
+  public async decryptErroredPayloads(): Promise<void> {
+    await this.itemsEncryption.decryptErroredPayloads()
+  }
+
+  public itemsKeyForPayload(payload: Models.EncryptedPayloadInterface): Models.ItemsKeyInterface | undefined {
+    return this.itemsEncryption.itemsKeyForPayload(payload)
+  }
+
+  public defaultItemsKeyForItemVersion(
+    version: Common.ProtocolVersion,
+    fromKeys?: Models.ItemsKeyInterface[],
+  ): Models.ItemsKeyInterface | undefined {
+    return this.itemsEncryption.defaultItemsKeyForItemVersion(version, fromKeys)
+  }
+
+  public async encryptSplitSingle(split: KeyedEncryptionSplit): Promise<Models.EncryptedPayloadInterface> {
+    return (await this.encryptSplit(split))[0]
+  }
+
+  public async encryptSplit(split: KeyedEncryptionSplit): Promise<Models.EncryptedPayloadInterface[]> {
+    const allEncryptedParams: EncryptedParameters[] = []
+
+    if (split.usesRootKey) {
+      const rootKeyEncrypted = await this.rootKeyEncryption.encryptPayloads(
+        split.usesRootKey.items,
+        split.usesRootKey.key,
+      )
+      Utils.extendArray(allEncryptedParams, rootKeyEncrypted)
+    }
+
+    if (split.usesItemsKey) {
+      const itemsKeyEncrypted = await this.itemsEncryption.encryptPayloads(
+        split.usesItemsKey.items,
+        split.usesItemsKey.key,
+      )
+      Utils.extendArray(allEncryptedParams, itemsKeyEncrypted)
+    }
+
+    if (split.usesRootKeyWithKeyLookup) {
+      const rootKeyEncrypted = await this.rootKeyEncryption.encryptPayloadsWithKeyLookup(
+        split.usesRootKeyWithKeyLookup.items,
+      )
+      Utils.extendArray(allEncryptedParams, rootKeyEncrypted)
+    }
+
+    if (split.usesItemsKeyWithKeyLookup) {
+      const itemsKeyEncrypted = await this.itemsEncryption.encryptPayloadsWithKeyLookup(
+        split.usesItemsKeyWithKeyLookup.items,
+      )
+      Utils.extendArray(allEncryptedParams, itemsKeyEncrypted)
+    }
+
+    const packagedEncrypted = allEncryptedParams.map((encryptedParams) => {
+      const original = FindPayloadInEncryptionSplit(encryptedParams.uuid, split)
+      return new EncryptedPayload({
+        ...original,
+        ...encryptedParams,
+        waitingForKey: false,
+        errorDecrypting: false,
+      })
+    })
+
+    return packagedEncrypted
+  }
+
+  public async decryptSplitSingle<
+    C extends Models.ItemContent = Models.ItemContent,
+    P extends Models.DecryptedPayloadInterface<C> = Models.DecryptedPayloadInterface<C>,
+  >(split: KeyedDecryptionSplit): Promise<P | Models.EncryptedPayloadInterface> {
+    const results = await this.decryptSplit<C, P>(split)
+    return results[0]
+  }
+
+  public async decryptSplit<
+    C extends Models.ItemContent = Models.ItemContent,
+    P extends Models.DecryptedPayloadInterface<C> = Models.DecryptedPayloadInterface<C>,
+  >(split: KeyedDecryptionSplit): Promise<(P | Models.EncryptedPayloadInterface)[]> {
+    const resultParams: (DecryptedParameters<C> | ErrorDecryptingParameters)[] = []
+
+    if (split.usesRootKey) {
+      const rootKeyDecrypted = await this.rootKeyEncryption.decryptPayloads<C>(
+        split.usesRootKey.items,
+        split.usesRootKey.key,
+      )
+      Utils.extendArray(resultParams, rootKeyDecrypted)
+    }
+
+    if (split.usesRootKeyWithKeyLookup) {
+      const rootKeyDecrypted = await this.rootKeyEncryption.decryptPayloadsWithKeyLookup<C>(
+        split.usesRootKeyWithKeyLookup.items,
+      )
+      Utils.extendArray(resultParams, rootKeyDecrypted)
+    }
+
+    if (split.usesItemsKey) {
+      const itemsKeyDecrypted = await this.itemsEncryption.decryptPayloads<C>(
+        split.usesItemsKey.items,
+        split.usesItemsKey.key,
+      )
+      Utils.extendArray(resultParams, itemsKeyDecrypted)
+    }
+
+    if (split.usesItemsKeyWithKeyLookup) {
+      const itemsKeyDecrypted = await this.itemsEncryption.decryptPayloadsWithKeyLookup<C>(
+        split.usesItemsKeyWithKeyLookup.items,
+      )
+      Utils.extendArray(resultParams, itemsKeyDecrypted)
+    }
+
+    const packagedResults = resultParams.map((params) => {
+      const original = FindPayloadInDecryptionSplit(params.uuid, split)
+
+      if (isErrorDecryptingParameters(params)) {
+        return new Models.EncryptedPayload({
+          ...original.ejected(),
+          ...params,
+        })
+      } else {
+        return new Models.DecryptedPayload<C>({
+          ...original.ejected(),
+          ...params,
+        }) as P
+      }
+    })
+
+    return packagedResults
+  }
+
+  /**
+   * Returns true if the user's account protocol version is not equal to the latest version.
+   */
+  public accountUpgradeAvailable(): boolean {
+    const userVersion = this.getUserVersion()
+    if (!userVersion) {
+      return false
+    }
+    return userVersion !== Common.ProtocolVersionLatest
+  }
+
+  /**
+   * Returns true if the user's account protocol version is not equal to the latest version.
+   */
+  public async passcodeUpgradeAvailable(): Promise<boolean> {
+    return this.rootKeyEncryption.passcodeUpgradeAvailable()
+  }
+
+  /**
+   * Determines whether the current environment is capable of supporting
+   * key derivation.
+   */
+  public platformSupportsKeyDerivation(keyParams: SNRootKeyParams) {
+    /**
+     * If the version is 003 or lower, key derivation is supported unless the browser is
+     * IE or Edge (or generally, where WebCrypto is not available) or React Native environment is detected.
+     *
+     * Versions 004 and above are always supported.
+     */
+    if (Common.compareVersions(keyParams.version, Common.ProtocolVersion.V004) >= 0) {
+      /* keyParams.version >= 004 */
+      return true
+    } else {
+      return !!Utils.isWebCryptoAvailable() || Utils.isReactNativeEnvironment()
+    }
+  }
+
+  public supportedVersions(): Common.ProtocolVersion[] {
+    return [
+      Common.ProtocolVersion.V001,
+      Common.ProtocolVersion.V002,
+      Common.ProtocolVersion.V003,
+      Common.ProtocolVersion.V004,
+    ]
+  }
+
+  /**
+   * Determines whether the input version is greater than the latest supported library version.
+   */
+  public isVersionNewerThanLibraryVersion(version: Common.ProtocolVersion) {
+    const libraryVersion = Common.ProtocolVersionLatest
+    return Common.compareVersions(version, libraryVersion) === 1
+  }
+
+  /**
+   * Versions 001 and 002 of the protocol supported dynamic costs, as reported by the server.
+   * This function returns the client-enforced minimum cost, to prevent the server from
+   * overwhelmingly under-reporting the cost.
+   */
+  public costMinimumForVersion(version: Common.ProtocolVersion) {
+    if (Common.compareVersions(version, Common.ProtocolVersion.V003) >= 0) {
+      throw 'Cost minimums only apply to versions <= 002'
+    }
+    if (version === Common.ProtocolVersion.V001) {
+      return V001Algorithm.PbkdfMinCost
+    } else if (version === Common.ProtocolVersion.V002) {
+      return V002Algorithm.PbkdfMinCost
+    } else {
+      throw `Invalid version for cost minimum: ${version}`
+    }
+  }
+
+  /**
+   * Computes a root key given a password and key params.
+   * Delegates computation to respective protocol operator.
+   */
+  public async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<RootKeyInterface> {
+    return this.rootKeyEncryption.computeRootKey(password, keyParams)
+  }
+
+  /**
+   * Creates a root key using the latest protocol version
+   */
+  public async createRootKey(
+    identifier: string,
+    password: string,
+    origination: Common.KeyParamsOrigination,
+    version?: Common.ProtocolVersion,
+  ) {
+    return this.rootKeyEncryption.createRootKey(identifier, password, origination, version)
+  }
+
+  public async decryptBackupFile(
+    file: BackupFile,
+    password?: string,
+  ): Promise<
+    ClientDisplayableError | (Models.EncryptedPayloadInterface | Models.DecryptedPayloadInterface<Models.ItemContent>)[]
+  > {
+    const result = await DecryptBackupFile(file, this, password)
+    return result
+  }
+
+  /**
+   * Creates a key params object from a raw object
+   * @param keyParams - The raw key params object to create a KeyParams object from
+   */
+  public createKeyParams(keyParams: Common.AnyKeyParamsContent) {
+    return CreateAnyKeyParams(keyParams)
+  }
+
+  public async createEncryptedBackupFile(): Promise<BackupFile> {
+    const payloads = this.itemManager.items.map((item) => item.payload)
+
+    const split = SplitPayloadsByEncryptionType(payloads)
+
+    const keyLookupSplit = CreateEncryptionSplitWithKeyLookup(split)
+
+    const result = await this.encryptSplit(keyLookupSplit)
+
+    const ejected = result.map((payload) => CreateEncryptedBackupFileContextPayload(payload))
+
+    const data: BackupFile = {
+      version: Common.ProtocolVersionLatest,
+      items: ejected,
+    }
+
+    const keyParams = await this.getRootKeyParams()
+    data.keyParams = keyParams?.getPortableValue()
+    return data
+  }
+
+  public createDecryptedBackupFile(): BackupFile {
+    const payloads = this.payloadManager.nonDeletedItems.filter(
+      (item) => item.content_type !== Common.ContentType.ItemsKey,
+    )
+
+    const data: BackupFile = {
+      version: Common.ProtocolVersionLatest,
+      items: payloads
+        .map((payload) => {
+          if (isDecryptedPayload(payload)) {
+            return CreateDecryptedBackupFileContextPayload(payload)
+          } else if (isEncryptedPayload(payload)) {
+            return CreateEncryptedBackupFileContextPayload(payload)
+          }
+          return undefined
+        })
+        .filter(isNotUndefined),
+    }
+
+    return data
+  }
+
+  public hasPasscode(): boolean {
+    return this.rootKeyEncryption.hasPasscode()
+  }
+
+  /**
+   * @returns True if the root key has not yet been unwrapped (passcode locked).
+   */
+  public async isPasscodeLocked() {
+    return (await this.rootKeyEncryption.hasRootKeyWrapper()) && this.rootKeyEncryption.getRootKey() == undefined
+  }
+
+  public async getRootKeyParams() {
+    return this.rootKeyEncryption.getRootKeyParams()
+  }
+
+  public getAccountKeyParams() {
+    return this.rootKeyEncryption.memoizedRootKeyParams
+  }
+
+  /**
+   * Computes the root key wrapping key given a passcode.
+   * Wrapping key params are read from disk.
+   */
+  public async computeWrappingKey(passcode: string) {
+    const keyParams = await this.rootKeyEncryption.getSureRootKeyWrapperKeyParams()
+    const key = await this.computeRootKey(passcode, keyParams)
+    return key
+  }
+
+  /**
+   * Unwraps the persisted root key value using the supplied wrappingKey.
+   * Application interfaces must check to see if the root key requires unwrapping on load.
+   * If so, they must generate the unwrapping key by getting our saved wrapping key keyParams.
+   * After unwrapping, the root key is automatically loaded.
+   */
+  public async unwrapRootKey(wrappingKey: RootKeyInterface) {
+    return this.rootKeyEncryption.unwrapRootKey(wrappingKey)
+  }
+  /**
+   * Encrypts rootKey and saves it in storage instead of keychain, and then
+   * clears keychain. This is because we don't want to store large encrypted
+   * payloads in the keychain. If the root key is not wrapped, it is stored
+   * in plain form in the user's secure keychain.
+   */
+  public async setNewRootKeyWrapper(wrappingKey: SNRootKey) {
+    return this.rootKeyEncryption.setNewRootKeyWrapper(wrappingKey)
+  }
+
+  public async removePasscode(): Promise<void> {
+    await this.rootKeyEncryption.removeRootKeyWrapper()
+  }
+
+  public async setRootKey(key: SNRootKey, wrappingKey?: SNRootKey) {
+    await this.rootKeyEncryption.setRootKey(key, wrappingKey)
+  }
+
+  /**
+   * Returns the in-memory root key value.
+   */
+  public getRootKey() {
+    return this.rootKeyEncryption.getRootKey()
+  }
+
+  /**
+   * Deletes root key and wrapper from keychain. Used when signing out of application.
+   */
+  public async deleteWorkspaceSpecificKeyStateFromDevice() {
+    await this.rootKeyEncryption.deleteWorkspaceSpecificKeyStateFromDevice()
+  }
+
+  public async validateAccountPassword(password: string) {
+    return this.rootKeyEncryption.validateAccountPassword(password)
+  }
+
+  public async validatePasscode(passcode: string) {
+    return this.rootKeyEncryption.validatePasscode(passcode)
+  }
+
+  public getEmbeddedPayloadAuthenticatedData(
+    payload: Models.EncryptedPayloadInterface,
+  ): RootKeyEncryptedAuthenticatedData | ItemAuthenticatedData | LegacyAttachedData | undefined {
+    const version = payload.version
+    if (!version) {
+      return undefined
+    }
+    const operator = this.operatorManager.operatorForVersion(version)
+    const authenticatedData = operator.getPayloadAuthenticatedData(encryptedParametersFromPayload(payload))
+    return authenticatedData
+  }
+
+  /** Returns the key params attached to this key's encrypted payload */
+  public getKeyEmbeddedKeyParams(key: Models.EncryptedPayloadInterface): SNRootKeyParams | undefined {
+    const authenticatedData = this.getEmbeddedPayloadAuthenticatedData(key)
+    if (!authenticatedData) {
+      return undefined
+    }
+    if (Common.isVersionLessThanOrEqualTo(key.version, Common.ProtocolVersion.V003)) {
+      const rawKeyParams = authenticatedData as LegacyAttachedData
+      return this.createKeyParams(rawKeyParams)
+    } else {
+      const rawKeyParams = (authenticatedData as RootKeyEncryptedAuthenticatedData).kp
+      return this.createKeyParams(rawKeyParams)
+    }
+  }
+
+  /**
+   * A new rootkey-based items key is needed if a user changes their account password
+   * on an 003 client and syncs on a signed in 004 client.
+   */
+  public needsNewRootKeyBasedItemsKey(): boolean {
+    if (!this.hasAccount()) {
+      return false
+    }
+
+    const rootKey = this.rootKeyEncryption.getRootKey()
+    if (!rootKey) {
+      return false
+    }
+
+    if (Common.compareVersions(rootKey.keyVersion, Common.ProtocolVersionLastNonrootItemsKey) > 0) {
+      /** Is >= 004, not needed */
+      return false
+    }
+
+    /**
+     * A new root key based items key is needed if our default items key content
+     * isnt equal to our current root key
+     */
+    const defaultItemsKey = findDefaultItemsKey(this.itemsEncryption.getItemsKeys())
+
+    /** Shouldn't be undefined, but if it is, we'll take the corrective action */
+    if (!defaultItemsKey) {
+      return true
+    }
+
+    return defaultItemsKey.itemsKey !== rootKey.itemsKey
+  }
+
+  public async createNewDefaultItemsKey(): Promise<Models.ItemsKeyInterface> {
+    return this.rootKeyEncryption.createNewDefaultItemsKey()
+  }
+
+  public getPasswordCreatedDate(): Date | undefined {
+    const rootKey = this.getRootKey()
+    return rootKey ? rootKey.keyParams.createdDate : undefined
+  }
+
+  public async onSyncEvent(eventName: Services.SyncEvent) {
+    if (eventName === Services.SyncEvent.SyncCompletedWithAllItemsUploaded) {
+      await this.handleFullSyncCompletion()
+    }
+    if (eventName === Services.SyncEvent.DownloadFirstSyncCompleted) {
+      await this.handleDownloadFirstSyncCompletion()
+    }
+  }
+
+  /**
+   * When a download-first sync completes, it means we've completed a (potentially multipage)
+   * sync where we only downloaded what the server had before uploading anything. We will be
+   * allowed to make local accomadations here before the server begins with the upload
+   * part of the sync (automatically runs after download-first sync completes).
+   * We use this to see if the server has any default itemsKeys, and if so, allows us to
+   * delete any never-synced items keys we have here locally.
+   */
+  private async handleDownloadFirstSyncCompletion() {
+    if (!this.hasAccount()) {
+      return
+    }
+
+    const itemsKeys = this.itemsEncryption.getItemsKeys()
+
+    const neverSyncedKeys = itemsKeys.filter((key) => {
+      return key.neverSynced
+    })
+
+    const syncedKeys = itemsKeys.filter((key) => {
+      return !key.neverSynced
+    })
+
+    /**
+     * Find isDefault items key that have been previously synced.
+     * If we find one, this means we can delete any non-synced keys.
+     */
+    const defaultSyncedKey = syncedKeys.find((key) => {
+      return key.isDefault
+    })
+
+    const hasSyncedItemsKey = !Utils.isNullOrUndefined(defaultSyncedKey)
+    if (hasSyncedItemsKey) {
+      /** Delete all never synced keys */
+      await this.itemManager.setItemsToBeDeleted(neverSyncedKeys)
+    } else {
+      /**
+       * No previous synced items key.
+       * We can keep the one(s) we have, only if their version is equal to our root key
+       * version. If their version is not equal to our root key version, delete them. If
+       * we end up with 0 items keys, create a new one. This covers the case when you open
+       * the app offline and it creates an 004 key, and then you sign into an 003 account.
+       */
+      const rootKeyParams = await this.getRootKeyParams()
+      if (rootKeyParams) {
+        /** If neverSynced.version != rootKey.version, delete. */
+        const toDelete = neverSyncedKeys.filter((itemsKey) => {
+          return itemsKey.keyVersion !== rootKeyParams.version
+        })
+        if (toDelete.length > 0) {
+          await this.itemManager.setItemsToBeDeleted(toDelete)
+        }
+
+        if (this.itemsEncryption.getItemsKeys().length === 0) {
+          await this.rootKeyEncryption.createNewDefaultItemsKey()
+        }
+      }
+    }
+    /** If we do not have an items key for our current account version, create one */
+    const userVersion = this.getUserVersion()
+    const accountVersionedKey = this.itemsEncryption.getItemsKeys().find((key) => key.keyVersion === userVersion)
+    if (Utils.isNullOrUndefined(accountVersionedKey)) {
+      await this.rootKeyEncryption.createNewDefaultItemsKey()
+    }
+
+    this.syncUnsycnedItemsKeys()
+  }
+
+  private async handleFullSyncCompletion() {
+    /** Always create a new items key after full sync, if no items key is found */
+    const currentItemsKey = findDefaultItemsKey(this.itemsEncryption.getItemsKeys())
+    if (!currentItemsKey) {
+      await this.rootKeyEncryption.createNewDefaultItemsKey()
+      if (this.rootKeyEncryption.keyMode === KeyMode.WrapperOnly) {
+        return this.itemsEncryption.repersistAllItems()
+      }
+    }
+  }
+
+  /**
+   * There is presently an issue where an items key created while signed out of account (
+   * or possibly signed in but with invalid session), then signing into account, results in that
+   * items key never syncing to the account even though it is being used to encrypt synced items.
+   * Until we can determine its cause, this corrective function will find any such keys and sync them.
+   */
+  private syncUnsycnedItemsKeys(): void {
+    if (!this.hasAccount()) {
+      return
+    }
+
+    const unsyncedKeys = this.itemsEncryption.getItemsKeys().filter((key) => key.neverSynced && !key.dirty)
+    if (unsyncedKeys.length > 0) {
+      void this.itemManager.setItemsDirty(unsyncedKeys)
+    }
+  }
+
+  override async getDiagnostics(): Promise<DiagnosticInfo | undefined> {
+    return {
+      encryption: {
+        getLatestVersion: this.getLatestVersion(),
+        hasAccount: this.hasAccount(),
+        hasRootKeyEncryptionSource: this.hasRootKeyEncryptionSource(),
+        getUserVersion: this.getUserVersion(),
+        upgradeAvailable: await this.upgradeAvailable(),
+        accountUpgradeAvailable: this.accountUpgradeAvailable(),
+        passcodeUpgradeAvailable: await this.passcodeUpgradeAvailable(),
+        hasPasscode: this.hasPasscode(),
+        isPasscodeLocked: await this.isPasscodeLocked(),
+        needsNewRootKeyBasedItemsKey: this.needsNewRootKeyBasedItemsKey(),
+        ...(await this.itemsEncryption.getDiagnostics()),
+        ...(await this.rootKeyEncryption.getDiagnostics()),
+      },
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Service/Functions.ts
+++ b/packages/encryption/src/Domain/Service/Functions.ts
@@ -0,0 +1,24 @@
+import { ItemsKeyInterface } from '@standardnotes/models'
+
+export function findDefaultItemsKey(itemsKeys: ItemsKeyInterface[]): ItemsKeyInterface | undefined {
+  if (itemsKeys.length === 1) {
+    return itemsKeys[0]
+  }
+
+  const defaultKeys = itemsKeys.filter((key) => {
+    return key.isDefault
+  })
+
+  if (defaultKeys.length > 1) {
+    /**
+     * Prioritize one that is synced, as neverSynced keys will likely be deleted after
+     * DownloadFirst sync.
+     */
+    const syncedKeys = defaultKeys.filter((key) => !key.neverSynced)
+    if (syncedKeys.length > 0) {
+      return syncedKeys[0]
+    }
+  }
+
+  return defaultKeys[0]
+}
--- a/packages/encryption/src/Domain/Service/Items/ItemsEncryption.ts
+++ b/packages/encryption/src/Domain/Service/Items/ItemsEncryption.ts
@@ -0,0 +1,250 @@
+import { ContentType, ProtocolVersion } from '@standardnotes/common'
+import { findDefaultItemsKey } from '../Functions'
+import { OperatorManager } from '../../Operator/OperatorManager'
+import { StandardException } from '../../StandardException'
+import * as OperatorWrapper from '../../Operator/OperatorWrapper'
+import * as Models from '@standardnotes/models'
+import * as Services from '@standardnotes/services'
+import {
+  DecryptedParameters,
+  EncryptedParameters,
+  ErrorDecryptingParameters,
+  isErrorDecryptingParameters,
+} from '../../Types/EncryptedParameters'
+import { isEncryptedPayload } from '@standardnotes/models'
+import { DiagnosticInfo } from '@standardnotes/services'
+import { Uuids } from '@standardnotes/utils'
+
+export class ItemsEncryptionService extends Services.AbstractService {
+  private removeItemsObserver!: () => void
+  public userVersion?: ProtocolVersion
+
+  constructor(
+    private itemManager: Services.ItemManagerInterface,
+    private payloadManager: Services.PayloadManagerInterface,
+    private storageService: Services.StorageServiceInterface,
+    private operatorManager: OperatorManager,
+    protected override internalEventBus: Services.InternalEventBusInterface,
+  ) {
+    super(internalEventBus)
+
+    this.removeItemsObserver = this.itemManager.addObserver([ContentType.ItemsKey], ({ changed, inserted }) => {
+      if (changed.concat(inserted).length > 0) {
+        void this.decryptErroredPayloads()
+      }
+    })
+  }
+
+  public override deinit(): void {
+    ;(this.itemManager as unknown) = undefined
+    ;(this.payloadManager as unknown) = undefined
+    ;(this.storageService as unknown) = undefined
+    this.removeItemsObserver()
+    ;(this.removeItemsObserver as unknown) = undefined
+    super.deinit()
+  }
+
+  /**
+   * If encryption status changes (esp. on mobile, where local storage encryption
+   * can be disabled), consumers may call this function to repersist all items to
+   * disk using latest encryption status.
+   */
+  async repersistAllItems(): Promise<void> {
+    const items = this.itemManager.items
+    const payloads = items.map((item) => item.payload)
+    return this.storageService.savePayloads(payloads)
+  }
+
+  public getItemsKeys() {
+    return this.itemManager.getDisplayableItemsKeys()
+  }
+
+  public itemsKeyForPayload(payload: Models.EncryptedPayloadInterface): Models.ItemsKeyInterface | undefined {
+    return this.getItemsKeys().find(
+      (key) => key.uuid === payload.items_key_id || key.duplicateOf === payload.items_key_id,
+    )
+  }
+
+  public getDefaultItemsKey(): Models.ItemsKeyInterface | undefined {
+    return findDefaultItemsKey(this.getItemsKeys())
+  }
+
+  private keyToUseForItemEncryption(): Models.ItemsKeyInterface | StandardException {
+    const defaultKey = this.getDefaultItemsKey()
+    let result: Models.ItemsKeyInterface | undefined = undefined
+
+    if (this.userVersion && this.userVersion !== defaultKey?.keyVersion) {
+      /**
+       * The default key appears to be either newer or older than the user's account version
+       * We could throw an exception here, but will instead fall back to a corrective action:
+       * return any items key that corresponds to the user's version
+       */
+      const itemsKeys = this.getItemsKeys()
+      result = itemsKeys.find((key) => key.keyVersion === this.userVersion)
+    } else {
+      result = defaultKey
+    }
+
+    if (!result) {
+      return new StandardException('Cannot find items key to use for encryption')
+    }
+
+    return result
+  }
+
+  private keyToUseForDecryptionOfPayload(
+    payload: Models.EncryptedPayloadInterface,
+  ): Models.ItemsKeyInterface | undefined {
+    if (payload.items_key_id) {
+      const itemsKey = this.itemsKeyForPayload(payload)
+      return itemsKey
+    }
+
+    const defaultKey = this.defaultItemsKeyForItemVersion(payload.version)
+    return defaultKey
+  }
+
+  public async encryptPayloadWithKeyLookup(payload: Models.DecryptedPayloadInterface): Promise<EncryptedParameters> {
+    const key = this.keyToUseForItemEncryption()
+
+    if (key instanceof StandardException) {
+      throw Error(key.message)
+    }
+
+    return this.encryptPayload(payload, key)
+  }
+
+  public async encryptPayload(
+    payload: Models.DecryptedPayloadInterface,
+    key: Models.ItemsKeyInterface,
+  ): Promise<EncryptedParameters> {
+    if (isEncryptedPayload(payload)) {
+      throw Error('Attempting to encrypt already encrypted payload.')
+    }
+    if (!payload.content) {
+      throw Error('Attempting to encrypt payload with no content.')
+    }
+    if (!payload.uuid) {
+      throw Error('Attempting to encrypt payload with no UuidGenerator.')
+    }
+
+    return OperatorWrapper.encryptPayload(payload, key, this.operatorManager)
+  }
+
+  public async encryptPayloads(
+    payloads: Models.DecryptedPayloadInterface[],
+    key: Models.ItemsKeyInterface,
+  ): Promise<EncryptedParameters[]> {
+    return Promise.all(payloads.map((payload) => this.encryptPayload(payload, key)))
+  }
+
+  public async encryptPayloadsWithKeyLookup(
+    payloads: Models.DecryptedPayloadInterface[],
+  ): Promise<EncryptedParameters[]> {
+    return Promise.all(payloads.map((payload) => this.encryptPayloadWithKeyLookup(payload)))
+  }
+
+  public async decryptPayloadWithKeyLookup<C extends Models.ItemContent = Models.ItemContent>(
+    payload: Models.EncryptedPayloadInterface,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    const key = this.keyToUseForDecryptionOfPayload(payload)
+
+    if (key == undefined) {
+      return {
+        uuid: payload.uuid,
+        errorDecrypting: true,
+        waitingForKey: true,
+      }
+    }
+
+    return this.decryptPayload(payload, key)
+  }
+
+  public async decryptPayload<C extends Models.ItemContent = Models.ItemContent>(
+    payload: Models.EncryptedPayloadInterface,
+    key: Models.ItemsKeyInterface,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    if (!payload.content) {
+      return {
+        uuid: payload.uuid,
+        errorDecrypting: true,
+      }
+    }
+
+    return OperatorWrapper.decryptPayload(payload, key, this.operatorManager)
+  }
+
+  public async decryptPayloadsWithKeyLookup<C extends Models.ItemContent = Models.ItemContent>(
+    payloads: Models.EncryptedPayloadInterface[],
+  ): Promise<(DecryptedParameters<C> | ErrorDecryptingParameters)[]> {
+    return Promise.all(payloads.map((payload) => this.decryptPayloadWithKeyLookup<C>(payload)))
+  }
+
+  public async decryptPayloads<C extends Models.ItemContent = Models.ItemContent>(
+    payloads: Models.EncryptedPayloadInterface[],
+    key: Models.ItemsKeyInterface,
+  ): Promise<(DecryptedParameters<C> | ErrorDecryptingParameters)[]> {
+    return Promise.all(payloads.map((payload) => this.decryptPayload<C>(payload, key)))
+  }
+
+  public async decryptErroredPayloads(): Promise<void> {
+    const payloads = this.payloadManager.invalidPayloads.filter((i) => i.content_type !== ContentType.ItemsKey)
+    if (payloads.length === 0) {
+      return
+    }
+
+    const resultParams = await this.decryptPayloadsWithKeyLookup(payloads)
+
+    const decryptedPayloads = resultParams.map((params) => {
+      const original = Models.SureFindPayload(payloads, params.uuid)
+      if (isErrorDecryptingParameters(params)) {
+        return new Models.EncryptedPayload({
+          ...original.ejected(),
+          ...params,
+        })
+      } else {
+        return new Models.DecryptedPayload({
+          ...original.ejected(),
+          ...params,
+        })
+      }
+    })
+
+    await this.payloadManager.emitPayloads(decryptedPayloads, Models.PayloadEmitSource.LocalChanged)
+  }
+
+  /**
+   * When migrating from non-items key architecture, many items will not have a
+   * relationship with any key object. For those items, we can be sure that only 1 key
+   * object will correspond to that protocol version.
+   * @returns The items key object to decrypt items encrypted
+   * with previous protocol version.
+   */
+  public defaultItemsKeyForItemVersion(
+    version: ProtocolVersion,
+    fromKeys?: Models.ItemsKeyInterface[],
+  ): Models.ItemsKeyInterface | undefined {
+    /** Try to find one marked default first */
+    const searchKeys = fromKeys || this.getItemsKeys()
+    const priorityKey = searchKeys.find((key) => {
+      return key.isDefault && key.keyVersion === version
+    })
+    if (priorityKey) {
+      return priorityKey
+    }
+    return searchKeys.find((key) => {
+      return key.keyVersion === version
+    })
+  }
+
+  override async getDiagnostics(): Promise<DiagnosticInfo | undefined> {
+    const keyForItems = this.keyToUseForItemEncryption()
+    return {
+      itemsEncryption: {
+        itemsKeysIds: Uuids(this.getItemsKeys()),
+        defaultItemsKeyId: this.getDefaultItemsKey()?.uuid,
+        keyToUseForItemEncryptionId: keyForItems instanceof StandardException ? undefined : keyForItems.uuid,
+      },
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Service/RootKey/KeyMode.ts
+++ b/packages/encryption/src/Domain/Service/RootKey/KeyMode.ts
@@ -0,0 +1,10 @@
+export enum KeyMode {
+  /** i.e No account and no passcode */
+  RootKeyNone = 0,
+  /** i.e Account but no passcode */
+  RootKeyOnly = 1,
+  /** i.e Account plus passcode */
+  RootKeyPlusWrapper = 2,
+  /** i.e No account, but passcode */
+  WrapperOnly = 3,
+}
--- a/packages/encryption/src/Domain/Service/RootKey/RootKeyEncryption.ts
+++ b/packages/encryption/src/Domain/Service/RootKey/RootKeyEncryption.ts
@@ -0,0 +1,643 @@
+import { CreateAnyKeyParams } from '../../Keys/RootKey/KeyParamsFunctions'
+import { findDefaultItemsKey } from '../Functions'
+import { KeyMode } from './KeyMode'
+import { OperatorManager } from '../../Operator/OperatorManager'
+import { SNRootKey } from '../../Keys/RootKey/RootKey'
+import { SNRootKeyParams } from '../../Keys/RootKey/RootKeyParams'
+import { UuidGenerator } from '@standardnotes/utils'
+import * as Common from '@standardnotes/common'
+import * as Models from '@standardnotes/models'
+import * as OperatorWrapper from '../../Operator/OperatorWrapper'
+import * as Services from '@standardnotes/services'
+import {
+  DecryptedParameters,
+  EncryptedParameters,
+  ErrorDecryptingParameters,
+  isErrorDecryptingParameters,
+} from '../../Types/EncryptedParameters'
+import { ItemsKeyMutator } from '../../Keys/ItemsKey'
+import { CreateNewRootKey } from '../../Keys/RootKey/Functions'
+import {
+  DecryptedPayload,
+  FillItemContentSpecialized,
+  ItemsKeyContent,
+  ItemsKeyContentSpecialized,
+  PayloadTimestampDefaults,
+  RootKeyContent,
+  RootKeyInterface,
+  NamespacedRootKeyInKeychain,
+} from '@standardnotes/models'
+
+export enum RootKeyServiceEvent {
+  RootKeyStatusChanged = 'RootKeyStatusChanged',
+}
+
+export class RootKeyEncryptionService extends Services.AbstractService<RootKeyServiceEvent> {
+  private rootKey?: RootKeyInterface
+  public keyMode = KeyMode.RootKeyNone
+  public memoizedRootKeyParams?: SNRootKeyParams
+
+  constructor(
+    private itemManager: Services.ItemManagerInterface,
+    private operatorManager: OperatorManager,
+    public deviceInterface: Services.DeviceInterface,
+    private storageService: Services.StorageServiceInterface,
+    private identifier: Common.ApplicationIdentifier,
+    protected override internalEventBus: Services.InternalEventBusInterface,
+  ) {
+    super(internalEventBus)
+  }
+
+  public override deinit(): void {
+    ;(this.itemManager as unknown) = undefined
+    this.rootKey = undefined
+    this.memoizedRootKeyParams = undefined
+    super.deinit()
+  }
+
+  public async initialize() {
+    const wrappedRootKey = this.getWrappedRootKey()
+    const accountKeyParams = await this.recomputeAccountKeyParams()
+    const hasWrapper = await this.hasRootKeyWrapper()
+    const hasRootKey = wrappedRootKey != undefined || accountKeyParams != undefined
+
+    if (hasWrapper && hasRootKey) {
+      this.keyMode = KeyMode.RootKeyPlusWrapper
+    } else if (hasWrapper && !hasRootKey) {
+      this.keyMode = KeyMode.WrapperOnly
+    } else if (!hasWrapper && hasRootKey) {
+      this.keyMode = KeyMode.RootKeyOnly
+    } else if (!hasWrapper && !hasRootKey) {
+      this.keyMode = KeyMode.RootKeyNone
+    } else {
+      throw 'Invalid key mode condition'
+    }
+
+    if (this.keyMode === KeyMode.RootKeyOnly) {
+      this.setRootKeyInstance(await this.getRootKeyFromKeychain())
+      await this.handleKeyStatusChange()
+    }
+  }
+
+  private async handleKeyStatusChange() {
+    await this.recomputeAccountKeyParams()
+    void this.notifyEvent(RootKeyServiceEvent.RootKeyStatusChanged)
+  }
+
+  public async passcodeUpgradeAvailable() {
+    const passcodeParams = await this.getRootKeyWrapperKeyParams()
+    if (!passcodeParams) {
+      return false
+    }
+    return passcodeParams.version !== Common.ProtocolVersionLatest
+  }
+
+  public async hasRootKeyWrapper() {
+    const wrapper = await this.getRootKeyWrapperKeyParams()
+    return wrapper != undefined
+  }
+
+  public hasAccount() {
+    switch (this.keyMode) {
+      case KeyMode.RootKeyNone:
+      case KeyMode.WrapperOnly:
+        return false
+      case KeyMode.RootKeyOnly:
+      case KeyMode.RootKeyPlusWrapper:
+        return true
+      default:
+        throw Error(`Unhandled keyMode value '${this.keyMode}'.`)
+    }
+  }
+
+  public hasRootKeyEncryptionSource(): boolean {
+    return this.hasAccount() || this.hasPasscode()
+  }
+
+  public hasPasscode() {
+    return this.keyMode === KeyMode.WrapperOnly || this.keyMode === KeyMode.RootKeyPlusWrapper
+  }
+
+  public async getEncryptionSourceVersion(): Promise<Common.ProtocolVersion> {
+    if (this.hasAccount()) {
+      return this.getSureUserVersion()
+    } else if (this.hasPasscode()) {
+      const passcodeParams = await this.getSureRootKeyWrapperKeyParams()
+      return passcodeParams.version
+    }
+
+    throw Error('Attempting to access encryption source version without source')
+  }
+
+  public getUserVersion(): Common.ProtocolVersion | undefined {
+    const keyParams = this.memoizedRootKeyParams
+    return keyParams?.version
+  }
+
+  private getSureUserVersion(): Common.ProtocolVersion {
+    const keyParams = this.memoizedRootKeyParams as SNRootKeyParams
+    return keyParams.version
+  }
+
+  private async getRootKeyFromKeychain() {
+    const rawKey = (await this.deviceInterface.getNamespacedKeychainValue(this.identifier)) as
+      | NamespacedRootKeyInKeychain
+      | undefined
+
+    if (rawKey == undefined) {
+      return undefined
+    }
+
+    const keyParams = await this.getSureRootKeyParams()
+
+    return CreateNewRootKey({
+      ...rawKey,
+      keyParams: keyParams.getPortableValue(),
+    })
+  }
+
+  private async saveRootKeyToKeychain() {
+    if (this.getRootKey() == undefined) {
+      throw 'Attempting to non-existent root key to the keychain.'
+    }
+    if (this.keyMode !== KeyMode.RootKeyOnly) {
+      throw 'Should not be persisting wrapped key to keychain.'
+    }
+
+    const rawKey = this.getSureRootKey().getKeychainValue()
+
+    return this.executeCriticalFunction(() => {
+      return this.deviceInterface.setNamespacedKeychainValue(rawKey, this.identifier)
+    })
+  }
+
+  public async getRootKeyWrapperKeyParams(): Promise<SNRootKeyParams | undefined> {
+    const rawKeyParams = await this.storageService.getValue(
+      Services.StorageKey.RootKeyWrapperKeyParams,
+      Services.StorageValueModes.Nonwrapped,
+    )
+
+    if (!rawKeyParams) {
+      return undefined
+    }
+
+    return CreateAnyKeyParams(rawKeyParams as Common.AnyKeyParamsContent)
+  }
+
+  public async getSureRootKeyWrapperKeyParams() {
+    return this.getRootKeyWrapperKeyParams() as Promise<SNRootKeyParams>
+  }
+
+  public async getRootKeyParams(): Promise<SNRootKeyParams | undefined> {
+    if (this.keyMode === KeyMode.WrapperOnly) {
+      return this.getRootKeyWrapperKeyParams()
+    } else if (this.keyMode === KeyMode.RootKeyOnly || this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      return this.recomputeAccountKeyParams()
+    } else if (this.keyMode === KeyMode.RootKeyNone) {
+      return undefined
+    } else {
+      throw `Unhandled key mode for getRootKeyParams ${this.keyMode}`
+    }
+  }
+
+  public async getSureRootKeyParams(): Promise<SNRootKeyParams> {
+    return this.getRootKeyParams() as Promise<SNRootKeyParams>
+  }
+
+  public async computeRootKey(password: string, keyParams: SNRootKeyParams): Promise<RootKeyInterface> {
+    const version = keyParams.version
+    const operator = this.operatorManager.operatorForVersion(version)
+    return operator.computeRootKey(password, keyParams)
+  }
+
+  public async createRootKey(
+    identifier: string,
+    password: string,
+    origination: Common.KeyParamsOrigination,
+    version?: Common.ProtocolVersion,
+  ) {
+    const operator = version ? this.operatorManager.operatorForVersion(version) : this.operatorManager.defaultOperator()
+    return operator.createRootKey(identifier, password, origination)
+  }
+
+  private getSureMemoizedRootKeyParams(): SNRootKeyParams {
+    return this.memoizedRootKeyParams as SNRootKeyParams
+  }
+
+  public async validateAccountPassword(password: string) {
+    const key = await this.computeRootKey(password, this.getSureMemoizedRootKeyParams())
+    const valid = this.getSureRootKey().compare(key)
+    if (valid) {
+      return { valid, artifacts: { rootKey: key } }
+    } else {
+      return { valid: false }
+    }
+  }
+
+  public async validatePasscode(passcode: string) {
+    const keyParams = await this.getSureRootKeyWrapperKeyParams()
+    const key = await this.computeRootKey(passcode, keyParams)
+    const valid = await this.validateWrappingKey(key)
+    if (valid) {
+      return { valid, artifacts: { wrappingKey: key } }
+    } else {
+      return { valid: false }
+    }
+  }
+
+  /**
+   * We know a wrappingKey is correct if it correctly decrypts
+   * wrapped root key.
+   */
+  public async validateWrappingKey(wrappingKey: SNRootKey) {
+    const wrappedRootKey = this.getWrappedRootKey()
+
+    /** If wrapper only, storage is encrypted directly with wrappingKey */
+    if (this.keyMode === KeyMode.WrapperOnly) {
+      return this.storageService.canDecryptWithKey(wrappingKey)
+    } else if (this.keyMode === KeyMode.RootKeyOnly || this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      /**
+       * In these modes, storage is encrypted with account keys, and
+       * account keys are encrypted with wrappingKey. Here we validate
+       * by attempting to decrypt account keys.
+       */
+      const wrappedKeyPayload = new Models.EncryptedPayload(wrappedRootKey)
+      const decrypted = await this.decryptPayload(wrappedKeyPayload, wrappingKey)
+      return !isErrorDecryptingParameters(decrypted)
+    } else {
+      throw 'Unhandled case in validateWrappingKey'
+    }
+  }
+
+  private async recomputeAccountKeyParams(): Promise<SNRootKeyParams | undefined> {
+    const rawKeyParams = await this.storageService.getValue(
+      Services.StorageKey.RootKeyParams,
+      Services.StorageValueModes.Nonwrapped,
+    )
+
+    if (!rawKeyParams) {
+      return
+    }
+
+    this.memoizedRootKeyParams = CreateAnyKeyParams(rawKeyParams as Common.AnyKeyParamsContent)
+    return this.memoizedRootKeyParams
+  }
+
+  /**
+   * Wraps the current in-memory root key value using the wrappingKey,
+   * then persists the wrapped value to disk.
+   */
+  private async wrapAndPersistRootKey(wrappingKey: SNRootKey) {
+    const rootKey = this.getSureRootKey()
+    const value: Models.DecryptedTransferPayload = {
+      ...rootKey.payload.ejected(),
+      content: FillItemContentSpecialized(rootKey.persistableValueWhenWrapping()),
+    }
+    const payload = new Models.DecryptedPayload(value)
+
+    const wrappedKey = await this.encryptPayload(payload, wrappingKey)
+    const wrappedKeyPayload = new Models.EncryptedPayload({
+      ...payload.ejected(),
+      ...wrappedKey,
+      errorDecrypting: false,
+      waitingForKey: false,
+    })
+
+    this.storageService.setValue(
+      Services.StorageKey.WrappedRootKey,
+      wrappedKeyPayload.ejected(),
+      Services.StorageValueModes.Nonwrapped,
+    )
+  }
+
+  public async unwrapRootKey(wrappingKey: RootKeyInterface) {
+    if (this.keyMode === KeyMode.WrapperOnly) {
+      this.setRootKeyInstance(wrappingKey)
+      return
+    }
+
+    if (this.keyMode !== KeyMode.RootKeyPlusWrapper) {
+      throw 'Invalid key mode condition for unwrapping.'
+    }
+
+    const wrappedKey = this.getWrappedRootKey()
+    const payload = new Models.EncryptedPayload(wrappedKey)
+    const decrypted = await this.decryptPayload<Models.RootKeyContent>(payload, wrappingKey)
+
+    if (isErrorDecryptingParameters(decrypted)) {
+      throw Error('Unable to decrypt root key with provided wrapping key.')
+    } else {
+      const decryptedPayload = new DecryptedPayload<RootKeyContent>({
+        ...payload.ejected(),
+        ...decrypted,
+      })
+      this.setRootKeyInstance(new SNRootKey(decryptedPayload))
+      await this.handleKeyStatusChange()
+    }
+  }
+
+  /**
+   * Encrypts rootKey and saves it in storage instead of keychain, and then
+   * clears keychain. This is because we don't want to store large encrypted
+   * payloads in the keychain. If the root key is not wrapped, it is stored
+   * in plain form in the user's secure keychain.
+   */
+  public async setNewRootKeyWrapper(wrappingKey: SNRootKey) {
+    if (this.keyMode === KeyMode.RootKeyNone) {
+      this.keyMode = KeyMode.WrapperOnly
+    } else if (this.keyMode === KeyMode.RootKeyOnly) {
+      this.keyMode = KeyMode.RootKeyPlusWrapper
+    } else {
+      throw Error('Attempting to set wrapper on already wrapped key.')
+    }
+
+    await this.deviceInterface.clearNamespacedKeychainValue(this.identifier)
+
+    if (this.keyMode === KeyMode.WrapperOnly || this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      if (this.keyMode === KeyMode.WrapperOnly) {
+        this.setRootKeyInstance(wrappingKey)
+        await this.reencryptItemsKeys()
+      } else {
+        await this.wrapAndPersistRootKey(wrappingKey)
+      }
+
+      this.storageService.setValue(
+        Services.StorageKey.RootKeyWrapperKeyParams,
+        wrappingKey.keyParams.getPortableValue(),
+        Services.StorageValueModes.Nonwrapped,
+      )
+
+      await this.handleKeyStatusChange()
+    } else {
+      throw Error('Invalid keyMode on setNewRootKeyWrapper')
+    }
+  }
+
+  /**
+   * Removes root key wrapper from local storage and stores root key bare in secure keychain.
+   */
+  public async removeRootKeyWrapper(): Promise<void> {
+    if (this.keyMode !== KeyMode.WrapperOnly && this.keyMode !== KeyMode.RootKeyPlusWrapper) {
+      throw Error('Attempting to remove root key wrapper on unwrapped key.')
+    }
+
+    if (this.keyMode === KeyMode.WrapperOnly) {
+      this.keyMode = KeyMode.RootKeyNone
+      this.setRootKeyInstance(undefined)
+    } else if (this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      this.keyMode = KeyMode.RootKeyOnly
+    }
+
+    await this.storageService.removeValue(Services.StorageKey.WrappedRootKey, Services.StorageValueModes.Nonwrapped)
+    await this.storageService.removeValue(
+      Services.StorageKey.RootKeyWrapperKeyParams,
+      Services.StorageValueModes.Nonwrapped,
+    )
+
+    if (this.keyMode === KeyMode.RootKeyOnly) {
+      await this.saveRootKeyToKeychain()
+    }
+
+    await this.handleKeyStatusChange()
+  }
+
+  public async setRootKey(key: SNRootKey, wrappingKey?: SNRootKey) {
+    if (!key.keyParams) {
+      throw Error('keyParams must be supplied if setting root key.')
+    }
+
+    if (this.getRootKey() === key) {
+      throw Error('Attempting to set root key as same current value.')
+    }
+
+    if (this.keyMode === KeyMode.WrapperOnly) {
+      this.keyMode = KeyMode.RootKeyPlusWrapper
+    } else if (this.keyMode === KeyMode.RootKeyNone) {
+      this.keyMode = KeyMode.RootKeyOnly
+    } else if (this.keyMode === KeyMode.RootKeyOnly || this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      /** Root key is simply changing, mode stays the same */
+      /** this.keyMode = this.keyMode; */
+    } else {
+      throw Error(`Unhandled key mode for setNewRootKey ${this.keyMode}`)
+    }
+
+    this.setRootKeyInstance(key)
+
+    this.storageService.setValue(
+      Services.StorageKey.RootKeyParams,
+      key.keyParams.getPortableValue(),
+      Services.StorageValueModes.Nonwrapped,
+    )
+
+    if (this.keyMode === KeyMode.RootKeyOnly) {
+      await this.saveRootKeyToKeychain()
+    } else if (this.keyMode === KeyMode.RootKeyPlusWrapper) {
+      if (!wrappingKey) {
+        throw Error('wrappingKey must be supplied')
+      }
+      await this.wrapAndPersistRootKey(wrappingKey)
+    }
+
+    await this.handleKeyStatusChange()
+  }
+
+  /**
+   * Deletes root key and wrapper from keychain. Used when signing out of application.
+   */
+  public async deleteWorkspaceSpecificKeyStateFromDevice() {
+    await this.deviceInterface.clearNamespacedKeychainValue(this.identifier)
+    await this.storageService.removeValue(Services.StorageKey.WrappedRootKey, Services.StorageValueModes.Nonwrapped)
+    await this.storageService.removeValue(
+      Services.StorageKey.RootKeyWrapperKeyParams,
+      Services.StorageValueModes.Nonwrapped,
+    )
+    await this.storageService.removeValue(Services.StorageKey.RootKeyParams, Services.StorageValueModes.Nonwrapped)
+    this.keyMode = KeyMode.RootKeyNone
+    this.setRootKeyInstance(undefined)
+
+    await this.handleKeyStatusChange()
+  }
+
+  private getWrappedRootKey() {
+    return this.storageService.getValue<Models.EncryptedTransferPayload>(
+      Services.StorageKey.WrappedRootKey,
+      Services.StorageValueModes.Nonwrapped,
+    )
+  }
+
+  public setRootKeyInstance(rootKey: RootKeyInterface | undefined): void {
+    this.rootKey = rootKey
+  }
+
+  public getRootKey(): RootKeyInterface | undefined {
+    return this.rootKey
+  }
+
+  private getSureRootKey(): RootKeyInterface {
+    return this.rootKey as RootKeyInterface
+  }
+
+  private getItemsKeys() {
+    return this.itemManager.getDisplayableItemsKeys()
+  }
+
+  public async encrypPayloadWithKeyLookup(payload: Models.DecryptedPayloadInterface): Promise<EncryptedParameters> {
+    const key = this.getRootKey()
+
+    if (key == undefined) {
+      throw Error('Attempting root key encryption with no root key')
+    }
+
+    return this.encryptPayload(payload, key)
+  }
+
+  public async encryptPayloadsWithKeyLookup(
+    payloads: Models.DecryptedPayloadInterface[],
+  ): Promise<EncryptedParameters[]> {
+    return Promise.all(payloads.map((payload) => this.encrypPayloadWithKeyLookup(payload)))
+  }
+
+  public async encryptPayload(
+    payload: Models.DecryptedPayloadInterface,
+    key: RootKeyInterface,
+  ): Promise<EncryptedParameters> {
+    return OperatorWrapper.encryptPayload(payload, key, this.operatorManager)
+  }
+
+  public async encryptPayloads(payloads: Models.DecryptedPayloadInterface[], key: RootKeyInterface) {
+    return Promise.all(payloads.map((payload) => this.encryptPayload(payload, key)))
+  }
+
+  public async decryptPayloadWithKeyLookup<C extends Models.ItemContent = Models.ItemContent>(
+    payload: Models.EncryptedPayloadInterface,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    const key = this.getRootKey()
+
+    if (key == undefined) {
+      return {
+        uuid: payload.uuid,
+        errorDecrypting: true,
+        waitingForKey: true,
+      }
+    }
+
+    return this.decryptPayload(payload, key)
+  }
+
+  public async decryptPayload<C extends Models.ItemContent = Models.ItemContent>(
+    payload: Models.EncryptedPayloadInterface,
+    key: RootKeyInterface,
+  ): Promise<DecryptedParameters<C> | ErrorDecryptingParameters> {
+    return OperatorWrapper.decryptPayload(payload, key, this.operatorManager)
+  }
+
+  public async decryptPayloadsWithKeyLookup<C extends Models.ItemContent = Models.ItemContent>(
+    payloads: Models.EncryptedPayloadInterface[],
+  ): Promise<(DecryptedParameters<C> | ErrorDecryptingParameters)[]> {
+    return Promise.all(payloads.map((payload) => this.decryptPayloadWithKeyLookup<C>(payload)))
+  }
+
+  public async decryptPayloads<C extends Models.ItemContent = Models.ItemContent>(
+    payloads: Models.EncryptedPayloadInterface[],
+    key: RootKeyInterface,
+  ): Promise<(DecryptedParameters<C> | ErrorDecryptingParameters)[]> {
+    return Promise.all(payloads.map((payload) => this.decryptPayload<C>(payload, key)))
+  }
+
+  /**
+   * When the root key changes (non-null only), we must re-encrypt all items
+   * keys with this new root key (by simply re-syncing).
+   */
+  public async reencryptItemsKeys(): Promise<void> {
+    const itemsKeys = this.getItemsKeys()
+
+    if (itemsKeys.length > 0) {
+      /**
+       * Do not call sync after marking dirty.
+       * Re-encrypting items keys is called by consumers who have specific flows who
+       * will sync on their own timing
+       */
+      await this.itemManager.setItemsDirty(itemsKeys)
+    }
+  }
+
+  /**
+   * Creates a new random items key to use for item encryption, and adds it to model management.
+   * Consumer must call sync. If the protocol version <= 003, only one items key should be created,
+   * and its .itemsKey value should be equal to the root key masterKey value.
+   */
+  public async createNewDefaultItemsKey(): Promise<Models.ItemsKeyInterface> {
+    const rootKey = this.getSureRootKey()
+    const operatorVersion = rootKey ? rootKey.keyVersion : Common.ProtocolVersionLatest
+    let itemTemplate: Models.ItemsKeyInterface
+
+    if (Common.compareVersions(operatorVersion, Common.ProtocolVersionLastNonrootItemsKey) <= 0) {
+      /** Create root key based items key */
+      const payload = new DecryptedPayload<ItemsKeyContent>({
+        uuid: UuidGenerator.GenerateUuid(),
+        content_type: Common.ContentType.ItemsKey,
+        content: Models.FillItemContentSpecialized<ItemsKeyContentSpecialized, ItemsKeyContent>({
+          itemsKey: rootKey.masterKey,
+          dataAuthenticationKey: rootKey.dataAuthenticationKey,
+          version: operatorVersion,
+        }),
+        ...PayloadTimestampDefaults(),
+      })
+      itemTemplate = Models.CreateDecryptedItemFromPayload(payload)
+    } else {
+      /** Create independent items key */
+      itemTemplate = this.operatorManager.operatorForVersion(operatorVersion).createItemsKey()
+    }
+
+    const itemsKeys = this.getItemsKeys()
+    const defaultKeys = itemsKeys.filter((key) => {
+      return key.isDefault
+    })
+
+    for (const key of defaultKeys) {
+      await this.itemManager.changeItemsKey(key, (mutator) => {
+        mutator.isDefault = false
+      })
+    }
+
+    const itemsKey = (await this.itemManager.insertItem(itemTemplate)) as Models.ItemsKeyInterface
+
+    await this.itemManager.changeItemsKey(itemsKey, (mutator) => {
+      mutator.isDefault = true
+    })
+
+    return itemsKey
+  }
+
+  public async createNewItemsKeyWithRollback(): Promise<() => Promise<void>> {
+    const currentDefaultItemsKey = findDefaultItemsKey(this.getItemsKeys())
+    const newDefaultItemsKey = await this.createNewDefaultItemsKey()
+
+    const rollback = async () => {
+      await this.itemManager.setItemToBeDeleted(newDefaultItemsKey)
+
+      if (currentDefaultItemsKey) {
+        await this.itemManager.changeItem<ItemsKeyMutator>(currentDefaultItemsKey, (mutator) => {
+          mutator.isDefault = true
+        })
+      }
+    }
+
+    return rollback
+  }
+
+  override async getDiagnostics(): Promise<Services.DiagnosticInfo | undefined> {
+    return {
+      rootKeyEncryption: {
+        hasRootKey: this.rootKey != undefined,
+        keyMode: KeyMode[this.keyMode],
+        hasRootKeyWrapper: await this.hasRootKeyWrapper(),
+        hasAccount: this.hasAccount(),
+        hasRootKeyEncryptionSource: this.hasRootKeyEncryptionSource(),
+        hasPasscode: this.hasPasscode(),
+        getEncryptionSourceVersion: this.hasRootKeyEncryptionSource() && (await this.getEncryptionSourceVersion()),
+        getUserVersion: this.getUserVersion(),
+      },
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Service/index.ts
+++ b/packages/encryption/src/Domain/Service/index.ts
@@ -0,0 +1,3 @@
+export * from '../Backups/BackupFile'
+export * from './Encryption/EncryptionService'
+export * from './RootKey/KeyMode'
--- a/packages/encryption/src/Domain/Split/EncryptionSplit.ts
+++ b/packages/encryption/src/Domain/Split/EncryptionSplit.ts
@@ -0,0 +1,109 @@
+import { Uuid } from '@standardnotes/common'
+import {
+  DecryptedPayloadInterface,
+  EncryptedPayloadInterface,
+  ItemsKeyInterface,
+  PayloadInterface,
+  RootKeyInterface,
+} from '@standardnotes/models'
+import { EncryptionTypeSplit } from './EncryptionTypeSplit'
+
+export interface AbstractKeySplit<T = EncryptedPayloadInterface | DecryptedPayloadInterface> {
+  usesRootKey?: {
+    items: T[]
+    key: RootKeyInterface
+  }
+  usesItemsKey?: {
+    items: T[]
+    key: ItemsKeyInterface
+  }
+  usesRootKeyWithKeyLookup?: {
+    items: T[]
+  }
+  usesItemsKeyWithKeyLookup?: {
+    items: T[]
+  }
+}
+
+export type KeyedEncryptionSplit = AbstractKeySplit<DecryptedPayloadInterface>
+export type KeyedDecryptionSplit = AbstractKeySplit<EncryptedPayloadInterface>
+
+export function CreateEncryptionSplitWithKeyLookup(
+  payloadSplit: EncryptionTypeSplit<DecryptedPayloadInterface>,
+): KeyedEncryptionSplit {
+  const result: KeyedEncryptionSplit = {}
+
+  if (payloadSplit.rootKeyEncryption) {
+    result.usesRootKeyWithKeyLookup = { items: payloadSplit.rootKeyEncryption }
+  }
+
+  if (payloadSplit.itemsKeyEncryption) {
+    result.usesItemsKeyWithKeyLookup = { items: payloadSplit.itemsKeyEncryption }
+  }
+
+  return result
+}
+
+export function CreateDecryptionSplitWithKeyLookup(
+  payloadSplit: EncryptionTypeSplit<EncryptedPayloadInterface>,
+): KeyedDecryptionSplit {
+  const result: KeyedDecryptionSplit = {}
+
+  if (payloadSplit.rootKeyEncryption) {
+    result.usesRootKeyWithKeyLookup = { items: payloadSplit.rootKeyEncryption }
+  }
+
+  if (payloadSplit.itemsKeyEncryption) {
+    result.usesItemsKeyWithKeyLookup = { items: payloadSplit.itemsKeyEncryption }
+  }
+
+  return result
+}
+
+export function FindPayloadInEncryptionSplit(uuid: Uuid, split: KeyedEncryptionSplit): DecryptedPayloadInterface {
+  const inUsesItemsKey = split.usesItemsKey?.items.find((item: PayloadInterface) => item.uuid === uuid)
+  if (inUsesItemsKey) {
+    return inUsesItemsKey
+  }
+
+  const inUsesRootKey = split.usesRootKey?.items.find((item) => item.uuid === uuid)
+  if (inUsesRootKey) {
+    return inUsesRootKey
+  }
+
+  const inUsesItemsKeyWithKeyLookup = split.usesItemsKeyWithKeyLookup?.items.find((item) => item.uuid === uuid)
+  if (inUsesItemsKeyWithKeyLookup) {
+    return inUsesItemsKeyWithKeyLookup
+  }
+
+  const inUsesRootKeyWithKeyLookup = split.usesRootKeyWithKeyLookup?.items.find((item) => item.uuid === uuid)
+  if (inUsesRootKeyWithKeyLookup) {
+    return inUsesRootKeyWithKeyLookup
+  }
+
+  throw Error('Cannot find payload in encryption split')
+}
+
+export function FindPayloadInDecryptionSplit(uuid: Uuid, split: KeyedDecryptionSplit): EncryptedPayloadInterface {
+  const inUsesItemsKey = split.usesItemsKey?.items.find((item: PayloadInterface) => item.uuid === uuid)
+  if (inUsesItemsKey) {
+    return inUsesItemsKey
+  }
+
+  const inUsesRootKey = split.usesRootKey?.items.find((item) => item.uuid === uuid)
+  if (inUsesRootKey) {
+    return inUsesRootKey
+  }
+
+  const inUsesItemsKeyWithKeyLookup = split.usesItemsKeyWithKeyLookup?.items.find((item) => item.uuid === uuid)
+  if (inUsesItemsKeyWithKeyLookup) {
+    return inUsesItemsKeyWithKeyLookup
+  }
+
+  const inUsesRootKeyWithKeyLookup = split.usesRootKeyWithKeyLookup?.items.find((item) => item.uuid === uuid)
+  if (inUsesRootKeyWithKeyLookup) {
+    return inUsesRootKeyWithKeyLookup
+  }
+
+  throw Error('Cannot find payload in encryption split')
+}
--- a/packages/encryption/src/Domain/Split/EncryptionTypeSplit.ts
+++ b/packages/encryption/src/Domain/Split/EncryptionTypeSplit.ts
@@ -0,0 +1,27 @@
+import { DecryptedPayloadInterface, EncryptedPayloadInterface } from '@standardnotes/models'
+import { ItemContentTypeUsesRootKeyEncryption } from '../Keys/RootKey/Functions'
+
+export interface EncryptionTypeSplit<T = EncryptedPayloadInterface | DecryptedPayloadInterface> {
+  rootKeyEncryption?: T[]
+  itemsKeyEncryption?: T[]
+}
+
+export function SplitPayloadsByEncryptionType<T extends EncryptedPayloadInterface | DecryptedPayloadInterface>(
+  payloads: T[],
+): EncryptionTypeSplit<T> {
+  const usesRootKey: T[] = []
+  const usesItemsKey: T[] = []
+
+  for (const item of payloads) {
+    if (ItemContentTypeUsesRootKeyEncryption(item.content_type)) {
+      usesRootKey.push(item)
+    } else {
+      usesItemsKey.push(item)
+    }
+  }
+
+  return {
+    rootKeyEncryption: usesRootKey.length > 0 ? usesRootKey : undefined,
+    itemsKeyEncryption: usesItemsKey.length > 0 ? usesItemsKey : undefined,
+  }
+}
--- a/packages/encryption/src/Domain/StandardException.ts
+++ b/packages/encryption/src/Domain/StandardException.ts
@@ -0,0 +1,7 @@
+export class StandardException {
+  constructor(public readonly message: string, log = false) {
+    if (log) {
+      console.error('StandardException raised: ', message)
+    }
+  }
+}
--- a/packages/encryption/src/Domain/Types/EncryptedParameters.ts
+++ b/packages/encryption/src/Domain/Types/EncryptedParameters.ts
@@ -0,0 +1,41 @@
+import { ProtocolVersion } from '@standardnotes/common'
+import { EncryptedPayloadInterface, ItemContent } from '@standardnotes/models'
+
+export type EncryptedParameters = {
+  uuid: string
+  content: string
+  items_key_id: string | undefined
+  enc_item_key: string
+  version: ProtocolVersion
+
+  /** @deprecated */
+  auth_hash?: string
+}
+
+export type DecryptedParameters<C extends ItemContent = ItemContent> = {
+  uuid: string
+  content: C
+}
+
+export type ErrorDecryptingParameters = {
+  uuid: string
+  errorDecrypting: true
+  waitingForKey?: boolean
+}
+
+export function isErrorDecryptingParameters(
+  x: EncryptedParameters | DecryptedParameters | ErrorDecryptingParameters,
+): x is ErrorDecryptingParameters {
+  return (x as ErrorDecryptingParameters).errorDecrypting
+}
+
+export function encryptedParametersFromPayload(payload: EncryptedPayloadInterface): EncryptedParameters {
+  return {
+    uuid: payload.uuid,
+    content: payload.content,
+    items_key_id: payload.items_key_id,
+    enc_item_key: payload.enc_item_key as string,
+    version: payload.version,
+    auth_hash: payload.auth_hash,
+  }
+}
--- a/packages/encryption/src/Domain/Types/ItemAuthenticatedData.ts
+++ b/packages/encryption/src/Domain/Types/ItemAuthenticatedData.ts
@@ -0,0 +1,6 @@
+import { Uuid, ProtocolVersion } from '@standardnotes/common'
+
+export type ItemAuthenticatedData = {
+  u: Uuid
+  v: ProtocolVersion
+}
--- a/packages/encryption/src/Domain/Types/LegacyAttachedData.ts
+++ b/packages/encryption/src/Domain/Types/LegacyAttachedData.ts
@@ -0,0 +1,8 @@
+import { AnyKeyParamsContent } from '@standardnotes/common'
+
+/**
+ * <= V003 optionally included key params content as last component in encrypted string
+ * as a json stringified base64 representation. This data is attached but not included
+ * in authentication hash.
+ */
+export type LegacyAttachedData = AnyKeyParamsContent & Record<string, unknown>
--- a/packages/encryption/src/Domain/Types/RootKeyEncryptedAuthenticatedData.ts
+++ b/packages/encryption/src/Domain/Types/RootKeyEncryptedAuthenticatedData.ts
@@ -0,0 +1,8 @@
+import { AnyKeyParamsContent } from '@standardnotes/common'
+import { ItemAuthenticatedData } from './ItemAuthenticatedData'
+
+/** Data that is attached to items that are encrypted with a root key */
+export type RootKeyEncryptedAuthenticatedData = ItemAuthenticatedData & {
+  /** The key params used to generate the root key that encrypts this item key */
+  kp: AnyKeyParamsContent
+}
--- a/packages/encryption/src/Domain/Workspace/PrivateWorkspace.ts
+++ b/packages/encryption/src/Domain/Workspace/PrivateWorkspace.ts
@@ -0,0 +1,18 @@
+import { PureCryptoInterface } from '@standardnotes/sncrypto-common'
+
+export async function ComputePrivateWorkspaceIdentifier(
+  crypto: PureCryptoInterface,
+  userphrase: string,
+  name: string,
+): Promise<string | undefined> {
+  const identifier = await crypto.hmac256(
+    await crypto.sha256(name.trim().toLowerCase()),
+    await crypto.sha256(userphrase.trim().toLowerCase()),
+  )
+
+  if (identifier == undefined) {
+    return undefined
+  }
+
+  return identifier
+}
--- a/packages/encryption/src/Domain/index.ts
+++ b/packages/encryption/src/Domain/index.ts
@@ -0,0 +1,15 @@
+export * from './Algorithm'
+export * from './Split/EncryptionSplit'
+export * from './Split/EncryptionTypeSplit'
+export * from './Operator'
+export * from './Keys/RootKey/KeyParamsFunctions'
+export * from './Keys/RootKey/RootKey'
+export * from './Keys/RootKey/RootKeyParams'
+export * from './Keys/RootKey/Functions'
+export * from './Service'
+export * from './Service/Encryption/EncryptionProvider'
+export * from './Split/EncryptionSplit'
+export * from './Workspace/PrivateWorkspace'
+export * from './Keys/ItemsKey'
+export * from './Keys/Utils/DecryptItemsKey'
+export * from './Keys/Utils/KeyRecoveryStrings'
--- a/packages/encryption/src/index.ts
+++ b/packages/encryption/src/index.ts
@@ -0,0 +1 @@
+export * from './Domain'
--- a/packages/encryption/tsconfig.json
+++ b/packages/encryption/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "extends": "../../node_modules/@standardnotes/config/src/tsconfig.json",
+  "compilerOptions": {
+    "skipLibCheck": true,
+    "rootDir": "./src",
+    "outDir": "./dist",
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "references": [],
+  "exclude": ["**/*.spec.ts", "dist", "node_modules"]
+}
--- a/packages/mobile/package.json
+++ b/packages/mobile/package.json
@@ -36,6 +36,7 @@
    "@react-navigation/native": "^6.0.10",
    "@react-navigation/stack": "^6.2.1",
    "@standardnotes/components-meta": "workspace:*",
+    "@standardnotes/encryption": "workspace:^",
    "@standardnotes/filepicker": "^1.16.23",
    "@standardnotes/icons": "workspace:*",
    "@standardnotes/react-native-aes": "^1.4.3",
--- a/packages/mobile/src/Lib/ComponentManager.ts
+++ b/packages/mobile/src/Lib/ComponentManager.ts
@@ -1,10 +1,10 @@
 import { MobileTheme } from '@Root/Style/MobileTheme'
 import { ComponentChecksumsType } from '@standardnotes/components-meta'
 import RawComponentChecksumsFile from '@standardnotes/components-meta/dist/zips/checksums.json'
+import { EncryptionService } from '@standardnotes/encryption'
 import { FeatureDescription, FeatureIdentifier, GetFeatures } from '@standardnotes/features'
 import {
  ComponentMutator,
-  EncryptionService,
  isRightVersionGreaterThanLeft,
  PermissionDialog,
  SNApplication,
--- a/packages/web/package.json
+++ b/packages/web/package.json
@@ -68,6 +68,7 @@
    "@reach/listbox": "^0.16.2",
    "@reach/tooltip": "^0.16.2",
    "@reach/visually-hidden": "^0.16.0",
+    "@standardnotes/encryption": "workspace:*",
    "@standardnotes/filepicker": "1.16.23",
    "@standardnotes/icons": "workspace:*",
    "@standardnotes/services": "^1.13.23",
--- a/packages/web/src/javascripts/Components/Preferences/Panes/Backups/DataBackups.tsx
+++ b/packages/web/src/javascripts/Components/Preferences/Panes/Backups/DataBackups.tsx
@@ -10,7 +10,7 @@ import {
  STRING_LOCAL_ENC_ENABLED,
  STRING_ENC_NOT_ENABLED,
 } from '@/Constants/Strings'
-import { BackupFile } from '@standardnotes/snjs'
+import { BackupFile } from '@standardnotes/encryption'
 import { ChangeEventHandler, MouseEventHandler, useCallback, useEffect, useRef, useState } from 'react'
 import { WebApplication } from '@/Application/Application'
 import { ViewControllerManager } from '@/Services/ViewControllerManager'
--- a/packages/web/src/javascripts/Services/ArchiveManager.ts
+++ b/packages/web/src/javascripts/Services/ArchiveManager.ts
@@ -2,11 +2,11 @@ import { WebApplication } from '@/Application/Application'
 import { parseFileName } from '@standardnotes/filepicker'
 import {
  ContentType,
-  BackupFile,
  BackupFileDecryptedContextualPayload,
  NoteContent,
  EncryptedItemInterface,
 } from '@standardnotes/snjs'
+import { BackupFile } from '@standardnotes/encryption'

 function sanitizeFileName(name: string): string {
  return name.trim().replace(/[.\\/:"?*|<>]/g, '_')
--- a/yarn.lock
+++ b/yarn.lock
@@ -6165,7 +6165,7 @@ __metadata:
  languageName: unknown
  linkType: soft

-"@standardnotes/config@npm:^2.4.3":
+"@standardnotes/config@npm:2.4.3, @standardnotes/config@npm:^2.4.3":
  version: 2.4.3
  resolution: "@standardnotes/config@npm:2.4.3"
  dependencies:
@@ -6326,27 +6326,26 @@ __metadata:
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  linkType: hard

-"@standardnotes/encryption@npm:^1.8.22":
-  version: 1.8.22
-  resolution: "@standardnotes/encryption@npm:1.8.22"
-  dependencies:
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-    "@standardnotes/responses": ^1.6.38
-    "@standardnotes/services": ^1.13.22
-  checksum: 7a571c4b257b7469054b37930b4157fa786b81558d0d7887fc5db0527c7eb5acd1d7ecdb90509d50652440017e708eb87d8820cf0df52b3c7a8628940d0e0e72
-  languageName: node
-  linkType: hard
-
-"@standardnotes/encryption@npm:^1.8.23":
-  version: 1.8.23
-  resolution: "@standardnotes/encryption@npm:1.8.23"
+"@standardnotes/encryption@^1.8.22, @standardnotes/encryption@^1.8.23, @standardnotes/encryption@workspace:*, @standardnotes/encryption@workspace:^, @standardnotes/encryption@workspace:packages/encryption":
+  version: 0.0.0-use.local
+  resolution: "@standardnotes/encryption@workspace:packages/encryption"
  dependencies:
+    "@standardnotes/common": ^1.23.1
+    "@standardnotes/config": 2.4.3
    "@standardnotes/models": ^1.11.13
    "@standardnotes/responses": ^1.6.39
    "@standardnotes/services": ^1.13.23
-  checksum: b86df01dc7d76eb170bd5d7cbe17b04d4c77ff657fda19cfc66a4e72d143016407ffc1434063e19d7f80a7a953df113a60712cba4a22be4a7ab7f125311a77e5
-  languageName: node
-  linkType: hard
+    "@standardnotes/sncrypto-common": ^1.9.0
+    "@standardnotes/utils": ^1.6.12
+    "@types/jest": ^27.4.1
+    "@types/node": ^18.0.0
+    "@typescript-eslint/eslint-plugin": ^5.30.0
+    eslint-plugin-prettier: ^4.2.1
+    jest: ^27.5.1
+    reflect-metadata: ^0.1.13
+    ts-jest: ^27.1.3
+  languageName: unknown
+  linkType: soft

 "@standardnotes/eslint-config-extensions@npm:1.0.1":
  version: 1.0.1
@@ -6721,6 +6720,7 @@ __metadata:
    "@react-navigation/stack": ^6.2.1
    "@standardnotes/components-meta": "workspace:*"
    "@standardnotes/config": ^2.4.3
+    "@standardnotes/encryption": "workspace:^"
    "@standardnotes/filepicker": ^1.16.23
    "@standardnotes/icons": "workspace:*"
    "@standardnotes/react-native-aes": ^1.4.3
@@ -7215,6 +7215,7 @@ __metadata:
    "@reach/listbox": ^0.16.2
    "@reach/tooltip": ^0.16.2
    "@reach/visually-hidden": ^0.16.0
+    "@standardnotes/encryption": "workspace:*"
    "@standardnotes/filepicker": 1.16.23
    "@standardnotes/icons": "workspace:*"
    "@standardnotes/services": ^1.13.23
@@ -8223,6 +8224,13 @@ __metadata:
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  linkType: hard

+"@types/node@npm:^18.0.0":
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+
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+"reflect-metadata@npm:^0.1.13":
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  linkType: hard

-"ts-jest@npm:^27.1.4":
+"ts-jest@npm:^27.1.3, ts-jest@npm:^27.1.4":
  version: 27.1.5
  resolution: "ts-jest@npm:27.1.5"
  dependencies: