|
public static CreateSymmetricAlgorithm ( ) : |
||
| return | ||
public static byte[] DecryptAuthenticated(byte[] authEncryptedBytes, byte[] cryptKey)
{
if (cryptKey == null || cryptKey.Length != KeySizeBytes)
{
throw new ArgumentException($"CryptKey needs to be {KeySize} bits", nameof(cryptKey));
}
//Grab IV from message
var iv = new byte[AesUtils.BlockSizeBytes];
Buffer.BlockCopy(authEncryptedBytes, 0, iv, 0, iv.Length);
using (var aes = AesUtils.CreateSymmetricAlgorithm())
{
using (var decrypter = aes.CreateDecryptor(cryptKey, iv))
using (var decryptedStream = new MemoryStream())
{
using (var decrypterStream = new CryptoStream(decryptedStream, decrypter, CryptoStreamMode.Write))
using (var writer = new BinaryWriter(decrypterStream))
{
//Decrypt Cipher Text from Message
writer.Write(
authEncryptedBytes,
iv.Length,
authEncryptedBytes.Length - iv.Length - KeySizeBytes);
}
return(decryptedStream.ToArray());
}
}
}
