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   ~NullDecrypter() override {}
  23
  24   // QuicDecrypter implementation
  25   bool SetKey(base::StringPiece key) override;
  26   bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
  27   bool DecryptPacket(QuicPacketSequenceNumber sequence_number,
  28                      const base::StringPiece& associated_data,
  29                      const base::StringPiece& ciphertext,
  30                      char* output,
  31                      size_t* output_length,
  32                      size_t max_output_length) override;
  33   base::StringPiece GetKey() const override;
  34   base::StringPiece GetNoncePrefix() const override;
  35
  36   const char* cipher_name() const override;
  37   uint32 cipher_id() const override;
  38
  39  private:
  40   bool ReadHash(QuicDataReader* reader, uint128* hash);
  41   uint128 ComputeHash(const base::StringPiece& data1,
  42                       const base::StringPiece& data2) const;
  43
  44   DISALLOW_COPY_AND_ASSIGN(NullDecrypter);
  45 };
  46
  47 }  // namespace net
  48
  49 #endif  // NET_QUIC_CRYPTO_NULL_DECRYPTER_H_