1// Copyright 2014 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_CHACHA20_POLY1305_DECRYPTER_H_ 6#define NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_ 7 8#include "net/quic/crypto/aead_base_decrypter.h" 9 10namespace net { 11 12// A ChaCha20Poly1305Decrypter is a QuicDecrypter that implements the 13// AEAD_CHACHA20_POLY1305 algorithm specified in 14// draft-agl-tls-chacha20poly1305-04, except that it truncates the Poly1305 15// authenticator to 12 bytes. Create an instance by calling 16// QuicDecrypter::Create(kCC12). 17// 18// It uses an authentication tag of 16 bytes (128 bits). There is no 19// fixed nonce prefix. 20class NET_EXPORT_PRIVATE ChaCha20Poly1305Decrypter : public AeadBaseDecrypter { 21 public: 22 enum { 23 kAuthTagSize = 12, 24 }; 25 26 ChaCha20Poly1305Decrypter(); 27 virtual ~ChaCha20Poly1305Decrypter(); 28 29 // Returns true if the underlying crypto library supports ChaCha20+Poly1305. 30 static bool IsSupported(); 31 32#if !defined(USE_OPENSSL) 33 protected: 34 // AeadBaseDecrypter methods: 35 virtual void FillAeadParams(base::StringPiece nonce, 36 base::StringPiece associated_data, 37 size_t auth_tag_size, 38 AeadParams* aead_params) const OVERRIDE; 39#endif 40 41 private: 42 DISALLOW_COPY_AND_ASSIGN(ChaCha20Poly1305Decrypter); 43}; 44 45} // namespace net 46 47#endif // NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_ 48