Move shared files in net/quic/ into net/quic/core/

net/quic/crypto/key_exchange.h

-// 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(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_