feat(mobile): crypto + secret-store + session-storage adapters

2026-05-13 23:55:07 +02:00
parent a275703ba6
commit 7ac93a95e6
3 changed files with 55 additions and 0 deletions
@@ -0,0 +1,28 @@
+import * as s from 'react-native-libsodium';
+import type { CryptoBackend } from '@chat-app/shared/crypto';
+
+// react-native-libsodium re-exports libsodium-wrappers' API shape, so
+// this adapter is the synchronous twin of the desktop one
+// (`apps/desktop/src/lib/cryptoBackend.ts`). No WASM warm-up gate is
+// needed — the native module is ready as soon as the module loads.
+export function createLibsodiumBackend(): CryptoBackend {
+  return {
+    name: 'react-native-libsodium',
+    nonceLength: s.crypto_box_NONCEBYTES,
+    publicKeyLength: s.crypto_box_PUBLICKEYBYTES,
+    privateKeyLength: s.crypto_box_SECRETKEYBYTES,
+    secretboxKeyLength: s.crypto_secretbox_KEYBYTES,
+    secretboxNonceLength: s.crypto_secretbox_NONCEBYTES,
+    randomBytes: (n) => s.randombytes_buf(n),
+    generateKeyPair: () => {
+      const kp = s.crypto_box_keypair();
+      return { publicKey: kp.publicKey, privateKey: kp.privateKey };
+    },
+    box: (plaintext, nonce, recipientPublicKey, senderPrivateKey) =>
+      s.crypto_box_easy(plaintext, nonce, recipientPublicKey, senderPrivateKey),
+    boxOpen: (ciphertext, nonce, senderPublicKey, recipientPrivateKey) =>
+      s.crypto_box_open_easy(ciphertext, nonce, senderPublicKey, recipientPrivateKey),
+    secretbox: (plaintext, nonce, key) => s.crypto_secretbox_easy(plaintext, nonce, key),
+    secretboxOpen: (ciphertext, nonce, key) => s.crypto_secretbox_open_easy(ciphertext, nonce, key),
+  };
+}