fix: remove monorepo

app/lib/crypto.ts

@@ -0,0 +1,58 @@
+const encoder = new TextEncoder();
+const decoder = new TextDecoder();
+const IV_LENGTH = 16;
+
+export async function encrypt(key: string, data: string) {
+  const iv = crypto.getRandomValues(new Uint8Array(IV_LENGTH));
+  const cryptoKey = await getKey(key);
+
+  const ciphertext = await crypto.subtle.encrypt(
+    {
+      name: 'AES-CBC',
+      iv,
+    },
+    cryptoKey,
+    encoder.encode(data),
+  );
+
+  const bundle = new Uint8Array(IV_LENGTH + ciphertext.byteLength);
+
+  bundle.set(new Uint8Array(ciphertext));
+  bundle.set(iv, ciphertext.byteLength);
+
+  return decodeBase64(bundle);
+}
+
+export async function decrypt(key: string, payload: string) {
+  const bundle = encodeBase64(payload);
+
+  const iv = new Uint8Array(bundle.buffer, bundle.byteLength - IV_LENGTH);
+  const ciphertext = new Uint8Array(bundle.buffer, 0, bundle.byteLength - IV_LENGTH);
+
+  const cryptoKey = await getKey(key);
+
+  const plaintext = await crypto.subtle.decrypt(
+    {
+      name: 'AES-CBC',
+      iv,
+    },
+    cryptoKey,
+    ciphertext,
+  );
+
+  return decoder.decode(plaintext);
+}
+
+async function getKey(key: string) {
+  return await crypto.subtle.importKey('raw', encodeBase64(key), { name: 'AES-CBC' }, false, ['encrypt', 'decrypt']);
+}
+
+function decodeBase64(encoded: Uint8Array) {
+  const byteChars = Array.from(encoded, (byte) => String.fromCodePoint(byte));
+
+  return btoa(byteChars.join(''));
+}
+
+function encodeBase64(data: string) {
+  return Uint8Array.from(atob(data), (ch) => ch.codePointAt(0)!);
+}