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_DECRYPTER_H_
6#define NET_QUIC_CRYPTO_NULL_DECRYPTER_H_
7
8#include "base/compiler_specific.h"
9#include "net/base/net_export.h"
10#include "net/quic/crypto/quic_decrypter.h"
11
12namespace net {
13
14class QuicDataReader;
15
16// A NullDecrypter is a QuicDecrypter used before a crypto negotiation
17// has occurred.  It does not actually decrypt the payload, but does
18// verify a hash (fnv128) over both the payload and associated data.
19class NET_EXPORT_PRIVATE NullDecrypter : public QuicDecrypter {
20 public:
21  NullDecrypter();
22  virtual ~NullDecrypter() {}
23
24  // QuicDecrypter implementation
25  virtual bool SetKey(base::StringPiece key) OVERRIDE;
26  virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) OVERRIDE;
27  virtual bool Decrypt(base::StringPiece nonce,
28                       base::StringPiece associated_data,
29                       base::StringPiece ciphertext,
30                       unsigned char* output,
31                       size_t* output_length) OVERRIDE;
32  virtual QuicData* DecryptPacket(QuicPacketSequenceNumber sequence_number,
33                                  base::StringPiece associated_data,
34                                  base::StringPiece ciphertext) OVERRIDE;
35  virtual base::StringPiece GetKey() const OVERRIDE;
36  virtual base::StringPiece GetNoncePrefix() const OVERRIDE;
37
38 private:
39  bool ReadHash(QuicDataReader* reader, uint128* hash);
40  uint128 ComputeHash(const std::string& data) const;
41
42  DISALLOW_COPY_AND_ASSIGN(NullDecrypter);
43};
44
45}  // namespace net
46
47#endif  // NET_QUIC_CRYPTO_NULL_DECRYPTER_H_
48