Here's the encryption method:
public static byte[] Encrypt(byte[] plaintext, byte[] key)
{
using (var aes = Aes.Create())
{
aes.BlockSize = 128;
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.None;
var iv = new byte[16];
for (int i = 0; i < iv.Length; i++)
iv[i] = 0;
aes.IV = iv;
var encryptor = aes.CreateEncryptor(key, aes.IV);
using(var target = new MemoryStream())
using (var cs = new CryptoStream(target, encryptor, CryptoStreamMode.Write))
{
using (var source = new StreamWriter(cs))
source.Write(plaintext);
return target.ToArray();
}
}
}
And how I'm calling it:
var key = new byte[16] { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
var plaintext = new byte[16] { 128, 0, 112, 0, 96, 0, 80, 0, 64, 0, 48, 0, 32, 0, 16, 0 };
But it keeps throwing an exception at source.Write(plaintext) that says it's not a complete block? I'm using a 16 byte/ 128 bit array with the block size set to 128. I don't understand what's wrong?
Also, just to head off any suggestions that ECB is bad etc, this is not for production, I'm just playing around.
StreamWriter writes UTF8 text characters to a stream.
You're writing plaintext.ToString() as text for the ciphertext.
This returns "System.Byte[]", which does not translate into 16 bytes of UTF8.
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