Exemplo n.º 1
0
        public void EncryptMessage(byte[] message, out byte[] encryptedBuffer)
        {
            encryptedBuffer = null;

            SECURITY_HANDLE EncryptionContext = _hClientContext;

            SecPkgContext_Sizes ContextSizes;

            if (QueryContextAttributes(ref EncryptionContext,
                                       SECPKG_ATTR_SIZES, out ContextSizes) != SEC_E_OK)
            {
                throw new Exception("QueryContextAttribute() failed!!!");
            }

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[]
            {
                new MultipleSecBufferHelper(new byte[ContextSizes.cbSecurityTrailer],
                                            SecBufferType.SECBUFFER_TOKEN),
                new MultipleSecBufferHelper(message, SecBufferType.SECBUFFER_DATA),
                new MultipleSecBufferHelper(new byte[ContextSizes.cbBlockSize],
                                            SecBufferType.SECBUFFER_PADDING)
            };

            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);

            try
            {
                if (EncryptMessage(ref EncryptionContext,
                                   SECQOP_WRAP_NO_ENCRYPT, ref DescBuffer, 0) != SEC_E_OK)
                {
                    throw new Exception("EncryptMessage() failed!!!");
                }

                encryptedBuffer = DescBuffer.GetSecBufferByteArray();
            }
            finally
            {
                DescBuffer.Dispose();
            }
        }
Exemplo n.º 2
0
        public void DecryptMessage(int messageLength, byte[] encryptedBuffer, out byte[] decryptedBuffer)
        {
            decryptedBuffer = null;

            SECURITY_HANDLE DecryptionContext = _hClientContext;

            byte[] EncryptedMessage = new byte[messageLength];
            Array.Copy(encryptedBuffer, 0, EncryptedMessage, 0, messageLength);

            int SecurityTrailerLength = encryptedBuffer.Length - messageLength;

            byte[] SecurityTrailer = new byte[SecurityTrailerLength];
            Array.Copy(encryptedBuffer, messageLength, SecurityTrailer, 0, SecurityTrailerLength);

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[]
            {
                new MultipleSecBufferHelper(EncryptedMessage, SecBufferType.SECBUFFER_DATA),
                new MultipleSecBufferHelper(SecurityTrailer, SecBufferType.SECBUFFER_STREAM)
            };

            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);

            try
            {
                uint EncryptionQuality;

                if (DecryptMessage(ref DecryptionContext, ref DescBuffer, 0, out EncryptionQuality) != SEC_E_OK)
                {
                    throw new Exception("DecryptMessage() failed!!!");
                }

                decryptedBuffer = new byte[messageLength];
                Array.Copy(DescBuffer.GetSecBufferByteArray(), 0, decryptedBuffer, 0, messageLength);
            }
            finally
            {
                DescBuffer.Dispose();
            }
        }