public CipherSuite(ProtocolVersion version)
        {
            ProtocolVersion = version;
            CipherSuiteID = 0x0000;
            CipherSuiteName = "TLS_NULL_WITH_NULL_NULL";

            _keyExchangeAlgorithm = new KeyExchangeAlgorithmNull();
            _signatureAlgorithm = new SignatureAlgorithmNull();
            _pseudoRandomFunction = null;
            _bulkCipherAlgorithm = new BulkCipherAlgorithmNull();
            _macAlgorithm = new MACAlgorithmNull();
        }
        protected HashAlgorithm GetSignatureHashAlgorithm(SignatureAlgorithm signatureAlgorithm, byte hashAlgorithmType)
        {
            if (!signatureAlgorithm.SupportsHashAlgorithmType(hashAlgorithmType))
            {
                throw new AlertException(AlertDescription.IllegalParameter,
                                         "Illegal hash algorithm type");
            }

            HashAlgorithm hashAlgorithm;
            switch (hashAlgorithmType)
            {
                case 1:
                    hashAlgorithm = new MD5CryptoServiceProvider();
                    break;
                case 2:
                    hashAlgorithm = new SHA1CryptoServiceProvider();
                    break;
                case 4:
                    hashAlgorithm = new SHA256Managed();
                    break;
                case 5:
                    hashAlgorithm = new SHA384Managed();
                    break;
                case 6:
                    hashAlgorithm = new SHA512Managed();
                    break;
                default:
                    throw new AlertException(AlertDescription.InternalError,
                                             "Unsupported hash algorithm type: " + hashAlgorithmType);
            }

            return hashAlgorithm;
        }