AaltoTLS.RecordLayer.RecordHandler.RemoveMAC C# (CSharp) Метод

        private static bool RemoveMAC(CipherSuite cipherSuite, Record record, UInt64 seqNum, KeyedHashAlgorithm hasher)
        {
            BulkCipherAlgorithmType cipherType = cipherSuite.BulkCipherAlgorithm.Type;
            bool verified = true;

            if (cipherType == BulkCipherAlgorithmType.Stream || cipherType == BulkCipherAlgorithmType.Block) {
                int MACLength = cipherSuite.MACAlgorithm.HashSize;
                if (record.Fragment.Length < MACLength) {
                    verified = false;
                } else {
                    // Allocate a fragment without the MAC value
                    byte[] newFragment = new byte[record.Fragment.Length - MACLength];
                    Buffer.BlockCopy(record.Fragment, 0, newFragment, 0, newFragment.Length);

                    // Calculate the MAC again for new fragment
                    byte[] oldFragment = record.Fragment;
                    record.Fragment = newFragment;
                    GenerateMAC(cipherSuite, record, seqNum, hasher);

                    // Compare our MAC value with theirs
                    verified = true;
                    for (int i=1; i<=MACLength; i++) {
                        if (oldFragment[oldFragment.Length-i] != record.Fragment[record.Fragment.Length-i]) {
                            verified = false;
                        }
                    }

                    // Replace fragment with the one without MAC value
                    record.Fragment = newFragment;
                }
            }

            return verified;
        }