/// <inheritdoc />
public ReadOnlySpan <byte> TransformBlock(ReadOnlySpan <byte> block)
{
using var hmac = new HMACSHA256(macKey);
var rv = new byte[block.Length + 32];
var inputBuffer = block.ToArray();
using var aes = new AesCounterMode();
using var enc = aes.CreateEncryptor(cryptoKey, Array.Empty <byte>());
var encrypted = enc.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
var hash = hmac.ComputeHash(encrypted);
hash.CopyTo(rv.AsSpan());
encrypted.CopyTo(rv.AsSpan(hash.Length));
return(rv);
}
public override void init(int mode, byte[] key, byte[] iv)
{
this.mode = mode;
aes_ctr = new AesCounterMode();
//String pad="NoPadding";
byte[] tmp;
int ivsize = getIVSize();
if (iv.Length > ivsize)
{
tmp = new byte[ivsize];
Array.Copy(iv, 0, tmp, 0, tmp.Length);
iv = tmp;
}
int bsize = getBlockSize();
if (key.Length > bsize)
{
tmp = new byte[bsize];
Array.Copy(key, 0, tmp, 0, tmp.Length);
key = tmp;
}
try
{
// SecretKeySpec keyspec=new SecretKeySpec(key, "AES");
// cipher=javax.crypto.Cipher.getInstance("AES/CBC/"+pad);
// cipher.init((mode==ENCRYPT_MODE?
// javax.crypto.Cipher.ENCRYPT_MODE:
// javax.crypto.Cipher.DECRYPT_MODE),
// keyspec, new IvParameterSpec(iv));
cipher = (mode == ENCRYPT_MODE?
aes_ctr.CreateEncryptor(key, iv):
aes_ctr.CreateDecryptor(key, iv));
}
catch (Exception e)
{
Console.WriteLine(e);
cipher = null;
}
}
