The below code works for encrypting the string "this is a test" with a key of "abcdefghijklmnop" and then decrypting at the site http://aesencryption.net/
static void test()
{
Console.WriteLine(Convert.ToBase64String(EncryptStringToBytes("this is a test", System.Text.Encoding.ASCII.GetBytes("abcdefghijklmnop"))));
}
static byte[] EncryptStringToBytes(string plainText, byte[] key)
{
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (key == null || key.Length <= 0)
throw new ArgumentNullException("key");
byte[] encrypted;
using (var rijAlg = new RijndaelManaged())
{
rijAlg.BlockSize = 256;
rijAlg.Key = key;
rijAlg.Mode = CipherMode.ECB;
rijAlg.Padding = PaddingMode.Zeros;
rijAlg.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
using (var msEncrypt = new MemoryStream())
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (var swEncrypt = new StreamWriter(csEncrypt))
swEncrypt.Write(plainText);
encrypted = msEncrypt.ToArray();
}
}
return encrypted;
}
