private byte[] ComputeAuthTag(byte[] aad, byte[] iv, byte[] cipherText, byte[] hmacKey)
{
byte[] al = Arrays.LongToBytes(aad.Length * 8);
byte[] hmacInput = Arrays.Concat(aad, iv, cipherText, al);
byte[] hmac = hashAlgorithm.Sign(hmacInput, hmacKey);
return(Arrays.FirstHalf(hmac));
}
public static byte[] Xor(byte[] left, long right)
{
Ensure.BitSize(left, 64, "Arrays.Xor(byte[], long) expects array size to be 8 bytes, but was {0}", new object[] { (int)left.Length });
return(Arrays.LongToBytes(Arrays.BytesToLong(left) ^ right));
}
private byte[] ComputeAuthTag(byte[] aad, byte[] iv, byte[] cipherText, byte[] hmacKey)
{
byte[] bytes = Arrays.LongToBytes((long)((int)aad.Length * 8));
byte[] numArray = Arrays.Concat(new byte[][] { aad, iv, cipherText, bytes });
return(Arrays.FirstHalf(this.hashAlgorithm.Sign(numArray, hmacKey)));
}
public static byte[] SixtyFourBitLength(byte[] aad)
{
return(Arrays.LongToBytes((long)((int)aad.Length * 8)));
}