Update protected query for folder and files.

src/utils/encryptionHelper.ts

@@ -10,3 +10,50 @@ export function generateRandomEncryptionKey(): Promise<string> {
     });
   });
 }
+
+export function createEncryptionKey(passphrase: string): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const salt = crypto.randomBytes(16); // generate a random salt
+    const iterations = 100000; // number of PBKDF2 iterations
+    const keyLength = 32; // desired key length in bytes
+
+    crypto.pbkdf2(
+      passphrase,
+      salt,
+      iterations,
+      keyLength,
+      "sha256",
+      (err, derivedKey) => {
+        if (err) throw reject(err);
+        const encryptionKey = derivedKey.toString("hex");
+        resolve(encryptionKey);
+      },
+    );
+  });
+}
+
+export function encrypt(data: string, encryptionKey: string) {
+  const iv = crypto.randomBytes(16);
+  const cipher = crypto.createCipheriv(
+    "aes-256-cbc",
+    Buffer.from(encryptionKey, "hex"),
+    iv,
+  );
+  let encrypted = cipher.update(data);
+  encrypted = Buffer.concat([encrypted, cipher.final()]);
+  return iv.toString("hex") + ":" + encrypted.toString("hex");
+}
+
+export function decrypt(encryptedData: string, encryptionKey: string) {
+  const [ivString, encryptedString] = encryptedData.split(":");
+  const iv = Buffer.from(ivString, "hex");
+  const encrypted = Buffer.from(encryptedString, "hex");
+  const decipher = crypto.createDecipheriv(
+    "aes-256-cbc",
+    Buffer.from(encryptionKey, "hex"),
+    iv,
+  );
+  let decrypted = decipher.update(encrypted);
+  decrypted = Buffer.concat([decrypted, decipher.final()]);
+  return decrypted.toString();
+}