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 QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_ 6 #define QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_ 7 8 #include "quiche/quic/core/crypto/chacha_base_encrypter.h" 9 #include "quiche/quic/platform/api/quic_export.h" 10 11 namespace quic { 12 13 // A ChaCha20Poly1305Encrypter is a QuicEncrypter that implements the 14 // AEAD_CHACHA20_POLY1305 algorithm specified in RFC 7539, except that 15 // it truncates the Poly1305 authenticator to 12 bytes. Create an instance 16 // by calling QuicEncrypter::Create(kCC20). 17 // 18 // It uses an authentication tag of 12 bytes (96 bits). The fixed prefix of the 19 // nonce is four bytes. 20 class QUICHE_EXPORT ChaCha20Poly1305Encrypter : public ChaChaBaseEncrypter { 21 public: 22 enum { 23 kAuthTagSize = 12, 24 }; 25 26 ChaCha20Poly1305Encrypter(); 27 ChaCha20Poly1305Encrypter(const ChaCha20Poly1305Encrypter&) = delete; 28 ChaCha20Poly1305Encrypter& operator=(const ChaCha20Poly1305Encrypter&) = 29 delete; 30 ~ChaCha20Poly1305Encrypter() override; 31 32 QuicPacketCount GetConfidentialityLimit() const override; 33 }; 34 35 } // namespace quic 36 37 #endif // QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_ 38