net/quic/crypto/aes_128_gcm_12_decrypter.h

   1 // Copyright (c) 2013 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_AES_128_GCM_12_DECRYPTER_H_
   6 #define NET_QUIC_CRYPTO_AES_128_GCM_12_DECRYPTER_H_
   7
   8 #include "net/quic/crypto/aead_base_decrypter.h"
   9
  10 namespace net {
  11
  12 // An Aes128Gcm12Decrypter is a QuicDecrypter that implements the
  13 // AEAD_AES_128_GCM_12 algorithm specified in RFC 5282. Create an instance by
  14 // calling QuicDecrypter::Create(kAESG).
  15 //
  16 // It uses an authentication tag of 12 bytes (96 bits). The fixed prefix
  17 // of the nonce is four bytes.
  18 class NET_EXPORT_PRIVATE Aes128Gcm12Decrypter : public AeadBaseDecrypter {
  19  public:
  20   enum {
  21     // Authentication tags are truncated to 96 bits.
  22     kAuthTagSize = 12,
  23   };
  24
  25   Aes128Gcm12Decrypter();
  26   ~Aes128Gcm12Decrypter() override;
  27
  28 #if !defined(USE_OPENSSL)
  29  protected:
  30   // AeadBaseDecrypter methods:
  31   void FillAeadParams(base::StringPiece nonce,
  32                       const base::StringPiece& associated_data,
  33                       size_t auth_tag_size,
  34                       AeadParams* aead_params) const override;
  35 #endif
  36
  37   const char* cipher_name() const override;
  38   uint32 cipher_id() const override;
  39
  40  private:
  41   DISALLOW_COPY_AND_ASSIGN(Aes128Gcm12Decrypter);
  42 };
  43
  44 }  // namespace net
  45
  46 #endif  // NET_QUIC_CRYPTO_AES_128_GCM_12_DECRYPTER_H_