Error : "Invalid length for a Base-64 char array."

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Hi, I want to Encrypt and Decrypt plain Text with C# with different keys.
When I run this code its gives the error Invalid length for a Base-64 char array on

C#

rijndaelCipher.Key = Convert.FromBase64String("ABC");

I also tried

C#

 rijndaelCipher.Key = Encoding.ASCII.GetBytes("ABC");
// but it gives this error "Specified key is not a valid size for this algorithm."

My code is :

public string EncryptString(string plainText)
        {
            // Instantiate a new RijndaelManaged object to perform string symmetric encryption
            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            // Set key and IV
            rijndaelCipher.Key = Convert.FromBase64String("ABC"); //Error is here                       

            MemoryStream memoryStream = new MemoryStream();
            ICryptoTransform rijndaelEncryptor = rijndaelCipher.CreateEncryptor();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelEncryptor, CryptoStreamMode.Write);
            byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherBytes = memoryStream.ToArray();

            memoryStream.Close();
            cryptoStream.Close();

            string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);
            return cipherText;
        }

Every suggestion would be appreciate.

Regards
Jayanta.

Posted 28-Jun-14 16:06pm

JayantaChatterjee

Updated 28-Jun-14 16:19pm

v2

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JayantaChatterjee · Answer 1 · 2014-06-28T16:22:00

Solved this problems by adding this method for converting string to byte array :

C#

private static byte[] CreateKey(string password)
        {
            var salt = new byte[] { 1, 2, 23, 234, 37, 48, 134, 63, 248, 4 };

            const int Iterations = 9872;
            var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, Iterations);
                return rfc2898DeriveBytes.GetBytes(32);

        }

Previous Code is :

rijndaelCipher.Key = Convert.FromBase64String("ABC");

After solved code is :

rijndaelCipher.Key =CreateKey("ABC");