Use non-subtle crypto in libsignal-protocol

ts/util/synchronousCrypto.ts

@@ -0,0 +1,57 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import crypto from 'crypto';
+
+import { typedArrayToArrayBuffer as toArrayBuffer } from '../Crypto';
+
+export function sign(key: ArrayBuffer, data: ArrayBuffer): ArrayBuffer {
+  return toArrayBuffer(
+    crypto
+      .createHmac('sha256', Buffer.from(key))
+      .update(Buffer.from(data))
+      .digest()
+  );
+}
+
+export function hash(data: ArrayBuffer): ArrayBuffer {
+  return toArrayBuffer(
+    crypto.createHash('sha512').update(Buffer.from(data)).digest()
+  );
+}
+
+export function encrypt(
+  key: ArrayBuffer,
+  data: ArrayBuffer,
+  iv: ArrayBuffer
+): ArrayBuffer {
+  const cipher = crypto.createCipheriv(
+    'aes-256-cbc',
+    Buffer.from(key),
+    Buffer.from(iv)
+  );
+  const encrypted = Buffer.concat([
+    cipher.update(Buffer.from(data)),
+    cipher.final(),
+  ]);
+
+  return toArrayBuffer(encrypted);
+}
+
+export function decrypt(
+  key: ArrayBuffer,
+  data: ArrayBuffer,
+  iv: ArrayBuffer
+): ArrayBuffer {
+  const cipher = crypto.createDecipheriv(
+    'aes-256-cbc',
+    Buffer.from(key),
+    Buffer.from(iv)
+  );
+  const decrypted = Buffer.concat([
+    cipher.update(Buffer.from(data)),
+    cipher.final(),
+  ]);
+
+  return toArrayBuffer(decrypted);
+}