Пример 3

class EncryptedClientChannelSink: IClientChannelSink { public IDictionary Properties { get { return null; } } private IClientChannelSink nextSink; public IClientChannelSink NextChannelSink { get { return nextSink; } } private SymmetricEncryptor encryptor; public EncryptedClientChannelSink(SymmetricEncryptor channelEncryptor, IClientChannelSink next) { encryptor = channelEncryptor; nextSink = next; } public void ProcessMessage(IMessage message, ITransportHeaders requestHeaders, Stream requestStream, out ITransportHeaders responseHeaders, out Stream responseStream) { MemoryStream encryptedStream = new MemoryStream(); Stream serverStream = null; // Зашифровать запрос клиента encryptor.Encrypt(requestStream, encryptedStream); encryptedStream.Position = 0; nextSink.ProcessMessage(message, requestHeaders, encryptedStream, out responseHeaders, out serverStream); serverStream = Utils.ReadAllStream(serverStream); // Расшифровать ответ сервера responseStream = new MemoryStream(); encryptor.Decrypt(serverStream, responseStream); responseStream.Position = 0; } public Stream GetRequestStream(IMessage msg, ITransportHeaders headers) { return null; } public void AsyncProcessRequest(IClientChannelSinkStack sinkStack, IMessage message, ITransportHeaders headers, Stream stream) { throw new NotSupportedException(); } public void AsyncProcessResponse( IClientResponseChannelSinkStack sinkStack, object state, ITransportHeaders headers, Stream stream) { throw new NotSupportedException(); } } // EncryptedClientChannelSink

Листинг 8.3.

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