AES encryption error: The input data is not a complete block?

Question

User-1664485818 posted

Hi everyone, when I run my code, I receive error “The input data is not a complete block”.

I know something is wrong with the input date, but I’m just passing in a string newMessage = "I love programming”

The code breaks at

byte[] enc = icrypt.TransformFinalBlock(textbytes, 0, textbytes.Length);

Any pointers much appreciated…

string newMessage = "I love programming";
string encMessage;
encMessage = Encryp(newMessage);

  public static string Encryp(string decrypted)
        {
            string IV = "qo1lc3sjd8zpt9cx";  //16 chars = 128 bytes
            string Key = "ow7dxys8glfor9tnc2ansdfo1etkfjcv"; // 32 chars = 256 bytes

            byte[] textbytes = ASCIIEncoding.ASCII.GetBytes(decrypted);
          
            AesCryptoServiceProvider encdec = new AesCryptoServiceProvider();

            encdec.BlockSize = 128;
            encdec.KeySize = 256;
            encdec.Key = ASCIIEncoding.ASCII.GetBytes(Key);
            encdec.IV = ASCIIEncoding.ASCII.GetBytes(IV);
            encdec.Padding = PaddingMode.PKCS7;
            encdec.Mode = CipherMode.CBC;

            ICryptoTransform icrypt = encdec.CreateDecryptor(encdec.Key, encdec.IV);

            byte[] enc = icrypt.TransformFinalBlock(textbytes, 0, textbytes.Length);
            icrypt.Dispose();

            return Convert.ToBase64String(enc);
        }

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</div>

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Answer 1

User1535942433 posted

Hi brucey,

According to your description,I have reproduce your problem. As far as I think,your problem is that  is not the encrypted stuff.

More details,you could refer to below codes:

 public static string Encryp(string decrypted)
        {
            string IV = "qo1lc3sjd8zpt9cx";  //16 chars = 128 bytes
            string Key = "ow7dxys8glfor9tnc2ansdfo1etkfjcv"; // 32 chars = 256 bytes
            byte[] textbytes = UnicodeEncoding.ASCII.GetBytes(decrypted);
            AesCryptoServiceProvider encdec = new AesCryptoServiceProvider();
            encdec.BlockSize = 128;
            encdec.KeySize = 256;
            encdec.Key = ASCIIEncoding.ASCII.GetBytes(Key);
            encdec.IV = ASCIIEncoding.ASCII.GetBytes(IV);
            encdec.Padding = PaddingMode.PKCS7;
            encdec.Mode = CipherMode.CBC;
            ICryptoTransform icrypt = encdec.CreateEncryptor(encdec.Key, encdec.IV);
            byte[] enc = icrypt.TransformFinalBlock(textbytes, 0, textbytes.Length);
            icrypt.Dispose();
            return Convert.ToBase64String(enc);
        }
        static void Main(string[] args)
        {
            string newMessage = "I love programming";
            string encMessage;
            encMessage = Encryp(newMessage);
        }

Best regards,

Yijing Sun

Answer 2

User-1664485818 posted

Thanks yij sun :)

encdec.CreateEncryptor