1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
6#define NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
7
8#include "base/compiler_specific.h"
9#include "net/base/net_export.h"
10#include "net/quic/crypto/quic_encrypter.h"
11
12namespace net {
13
14// A NullEncrypter is a QuicEncrypter used before a crypto negotiation
15// has occurred.  It does not actually encrypt the payload, but does
16// generate a MAC (fnv128) over both the payload and associated data.
17class NET_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
18 public:
19  NullEncrypter();
20  virtual ~NullEncrypter() {}
21
22  // QuicEncrypter implementation
23  virtual bool SetKey(base::StringPiece key) OVERRIDE;
24  virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) OVERRIDE;
25  virtual bool Encrypt(base::StringPiece nonce,
26                       base::StringPiece associated_data,
27                       base::StringPiece plaintext,
28                       unsigned char* output) OVERRIDE;
29  virtual QuicData* EncryptPacket(QuicPacketSequenceNumber sequence_number,
30                                  base::StringPiece associated_data,
31                                  base::StringPiece plaintext) OVERRIDE;
32  virtual size_t GetKeySize() const OVERRIDE;
33  virtual size_t GetNoncePrefixSize() const OVERRIDE;
34  virtual size_t GetMaxPlaintextSize(size_t ciphertext_size) const OVERRIDE;
35  virtual size_t GetCiphertextSize(size_t plaintext_size) const OVERRIDE;
36  virtual base::StringPiece GetKey() const OVERRIDE;
37  virtual base::StringPiece GetNoncePrefix() const OVERRIDE;
38
39 private:
40  size_t GetHashLength() const;
41
42  DISALLOW_COPY_AND_ASSIGN(NullEncrypter);
43};
44
45}  // namespace net
46
47#endif  // NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
48