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diff --git a/chromium/net/quic/crypto/key_exchange.h b/chromium/net/quic/crypto/key_exchange.h
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+++ b/chromium/net/quic/crypto/key_exchange.h
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+// Copyright (c) 2013 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.
+
+#ifndef NET_QUIC_CRYPTO_KEY_EXCHANGE_H_
+#define NET_QUIC_CRYPTO_KEY_EXCHANGE_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/quic/crypto/crypto_protocol.h"
+
+namespace net {
+
+class QuicRandom;
+
+// KeyExchange is an abstract class that provides an interface to a
+// key-exchange primitive.
+class NET_EXPORT_PRIVATE KeyExchange {
+ public:
+  virtual ~KeyExchange() {}
+
+  // NewKeyPair generates a new public, private key pair. The caller takes
+  // ownership of the return value. (This is intended for servers that need to
+  // generate forward-secure keys.)
+  virtual KeyExchange* NewKeyPair(QuicRandom* rand) const = 0;
+
+  // CalculateSharedKey computes the shared key between the local private key
+  // (which is implicitly known by a KeyExchange object) and a public value
+  // from the peer.
+  virtual bool CalculateSharedKey(const base::StringPiece& peer_public_value,
+                                  std::string* shared_key) const = 0;
+
+  // public_value returns the local public key which can be sent to a peer in
+  // order to complete a key exchange. The returned StringPiece is a reference
+  // to a member of the KeyExchange and is only valid for as long as the
+  // KeyExchange exists.
+  virtual base::StringPiece public_value() const = 0;
+
+  // tag returns the tag value that identifies this key exchange function.
+  virtual QuicTag tag() const = 0;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_KEY_EXCHANGE_H_