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packages/shared/src/crypto.ts

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+import { xchacha20poly1305 } from "@noble/ciphers/chacha.js";
+import { managedNonce, randomBytes, utf8ToBytes } from "@noble/ciphers/utils.js";
+import { scrypt } from "@noble/hashes/scrypt.js";
+
+export { bytesToUtf8, utf8ToBytes } from "@noble/ciphers/utils.js";
+export { randomBytes } from "@noble/ciphers/utils.js";
+
+const N = 2 ** 15;
+const KEY_SIZE = 32;
+
+export function generateKey(): Uint8Array {
+  return randomBytes(KEY_SIZE);
+}
+
+export function deriveKey(password: string, salt: Uint8Array): Uint8Array {
+  return scrypt(password, salt, { N, r: 8, p: 1, dkLen: KEY_SIZE });
+}
+
+export function encrypt(data: Uint8Array, key: Uint8Array): Uint8Array {
+  const chacha = managedNonce(xchacha20poly1305)(key);
+  return chacha.encrypt(data);
+}
+
+export function decrypt(data: Uint8Array, key: Uint8Array): Uint8Array {
+  const chacha = managedNonce(xchacha20poly1305)(key);
+  return chacha.decrypt(data);
+}
+
+export function bytesToHex(bytes: Uint8Array): string {
+  return Array.from(bytes)
+    .map((b) => b.toString(16).padStart(2, "0"))
+    .join("");
+}
+
+export function hexToBytes(hex: string): Uint8Array {
+  const bytes = new Uint8Array(hex.length / 2);
+  for (let i = 0; i < bytes.length; i++) {
+    bytes[i] = Number.parseInt(hex.slice(i * 2, i * 2 + 2), 16);
+  }
+  return bytes;
+}