RijndaelManaged doesn't encrypt

Question

I'm trying to encrypt a buffer with RijndaelManaged class without any success. It always return byte[0]. Here's the code:

    public byte[] Encrypt(byte[] data, byte[] key)
    {
        using (var ms = new MemoryStream())
        {
            using (var aes = RijndaelManaged.Create())
            {
                aes.Key = _checksumProvider.CalculateChecksum(key);
                aes.IV = _checksumProvider.CalculateChecksum(key);
                var stream = new CryptoStream(ms, aes.CreateEncryptor(aes.Key, aes.IV), CryptoStreamMode.Write);
                stream.Write(data, 0, data.Length);
                return ms.ToArray();
            }
        }
    }

Key and IV are correctly assigned. Any idea what's wrong with the code? Thanks.

Answer 1

You need to call stream.FlushFinalBlock().

This will perform any final steps in the encryption, and flush the CryptoStream's internal buffer into the underlying memory stream.