net/quic/crypto/null_decrypter.h

   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
  12 namespace net {
  13
  14 class 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.
  19 class 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_