net/quic/crypto/null_encrypter.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_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
  12 namespace 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.
  17 class 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_