decrypted return SecretBox has wrong message authentication code (MAC)

[zupvlad]

Hi,

I received from python the Ciphertext (this is formated from StringEcrypted + first 4 elements from MAC. When I'll try to decrypt the message I received wrong MAC. I think the problem is on MAC. I'm able to set the MAC length with 4 on the SecretBox? I'll add the code:

Future<List> decrypt(List message) async { final algorithm = AesGcm.with128bits(); final key = await kdf(isEncrypt: true); final secretKey = SecretKey(key); final mac = Mac(message.skip(message.length - 4).toList()); final secretMessage = SecretBox(message.take(message.length - 4).toList(), nonce: HEX.decode(cpIV), mac: mac); final clearText = await algorithm.decrypt(secretMessage, secretKey: secretKey); print(clearText); return clearText; }

SecretBox details "Nonce: [174, 1, 226, 226, 211, 55, 4, 206, 188, 172, 17, 149]" "Ciphertext: [179, 43, 17]" "MAC: [255, 47, 7, 170]"