Implement QUIC key extraction.

net/quic/quic_crypto_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_crypto_stream.h"
 
 #include <string>
 
 #include "base/strings/string_piece.h"
 #include "net/quic/crypto/crypto_handshake.h"
+#include "net/quic/crypto/crypto_utils.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_session.h"
 #include "net/quic/quic_utils.h"
 
 using std::string;
 using base::StringPiece;
 
 namespace net {
 
 QuicCryptoStream::QuicCryptoStream(QuicSession* session)
@@ skipping 34 matching lines @@
 }
 
 void QuicCryptoStream::SendHandshakeMessage(
     const CryptoHandshakeMessage& message) {
   session()->OnCryptoHandshakeMessageSent(message);
   const QuicData& data = message.GetSerialized();
   // TODO(wtc): check the return value.
   WriteOrBufferData(string(data.data(), data.length()), false, NULL);
 }
 
+bool QuicCryptoStream::ExportKeyingMaterial(
+    StringPiece label,
+    StringPiece context,
+    size_t result_len,
+    string* result) const {
+  if (!handshake_confirmed()) {
+    DLOG(ERROR) << "ExportKeyingMaterial was called before forward-secure"
+                << "encryption was established.";
+    return false;
+  }
+  return CryptoUtils::ExportKeyingMaterial(
+      crypto_negotiated_params_.subkey_secret,
+      label,
+      context,
+      result_len,
+      result);
+}
+
 const QuicCryptoNegotiatedParameters&
 QuicCryptoStream::crypto_negotiated_params() const {
   return crypto_negotiated_params_;
 }
 
 }  // namespace net