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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 NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
#define NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "net/quic/crypto/aead_base_decrypter.h"
namespace net {
// A ChaCha20Poly1305Decrypter is a QuicDecrypter that implements the
// AEAD_CHACHA20_POLY1305 algorithm specified in
// draft-agl-tls-chacha20poly1305-04, except that it truncates the Poly1305
// authenticator to 12 bytes. Create an instance by calling
// QuicDecrypter::Create(kCC12).
//
// It uses an authentication tag of 16 bytes (128 bits). There is no
// fixed nonce prefix.
class NET_EXPORT_PRIVATE ChaCha20Poly1305Decrypter : public AeadBaseDecrypter {
public:
enum {
kAuthTagSize = 12,
};
ChaCha20Poly1305Decrypter();
~ChaCha20Poly1305Decrypter() override;
#if !defined(USE_OPENSSL)
protected:
// AeadBaseDecrypter methods:
void FillAeadParams(base::StringPiece nonce,
base::StringPiece associated_data,
size_t auth_tag_size,
AeadParams* aead_params) const override;
#endif
const char* cipher_name() const override;
uint32_t cipher_id() const override;
private:
DISALLOW_COPY_AND_ASSIGN(ChaCha20Poly1305Decrypter);
};
} // namespace net
#endif // NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
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