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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
#define QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
#include <cstdint>
#include "quic/core/crypto/chacha_base_decrypter.h"
#include "quic/platform/api/quic_export.h"
namespace quic {
// A ChaCha20Poly1305Decrypter is a QuicDecrypter that implements the
// AEAD_CHACHA20_POLY1305 algorithm specified in RFC 7539, except that
// it truncates the Poly1305 authenticator to 12 bytes. Create an instance
// by calling QuicDecrypter::Create(kCC20).
//
// It uses an authentication tag of 12 bytes (96 bits). The fixed prefix of the
// nonce is four bytes.
class QUIC_EXPORT_PRIVATE ChaCha20Poly1305Decrypter
: public ChaChaBaseDecrypter {
public:
enum {
kAuthTagSize = 12,
};
ChaCha20Poly1305Decrypter();
ChaCha20Poly1305Decrypter(const ChaCha20Poly1305Decrypter&) = delete;
ChaCha20Poly1305Decrypter& operator=(const ChaCha20Poly1305Decrypter&) =
delete;
~ChaCha20Poly1305Decrypter() override;
uint32_t cipher_id() const override;
QuicPacketCount GetIntegrityLimit() const override;
};
} // namespace quic
#endif // QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_