feat: add sncrypto client side packages

packages/sncrypto-common/src/Common/Utils.ts

@@ -0,0 +1,22 @@
+/**
+ * Constant-time string comparison
+ * @param a
+ * @param b
+ */
+export function timingSafeEqual(a: string, b: string): boolean {
+  const strA = String(a)
+  let strB = String(b)
+  const lenA = strA.length
+  let result = 0
+
+  if (lenA !== strB.length) {
+    strB = strA
+    result = 1
+  }
+
+  for (let i = 0; i < lenA; i++) {
+    result |= strA.charCodeAt(i) ^ strB.charCodeAt(i)
+  }
+
+  return result === 0
+}