code: function (data, secret, encoder, mode) {
        // mode = CBC, CFB, OFB, CTR
        mode = mode || MODE;
        var keyIv = this.getBytesFromSecret(secret);
        var cipher = forge.aes.createDecryptionCipher(keyIv, mode);
        cipher.start(keyIv);
        var decoded;
        if (encoder === 'url') {
          decoded = base64url.decode(data);
        } else {
          decoded = forge.util.decode64(data);
        }
        cipher.update(forge.util.createBuffer(decoded));
        cipher.finish();
        return cipher.output.data;
      }
docs: Decrypt AES encrypted data
  @param {String} data The data to decrypt
  @param {String} secret The secret to use in decryption in Base64 format
  @param {String} [encoder = 'base64'] base64 or url encoding
  @param {String} [mode='CTR'] The mode to use in decryption. 'CBC', 'CFB', 'OFB', 'CTR' are allowed modes.
  @return {String} The decrypted data