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// Copyright (c) 2012 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.
#include <cstddef>
#include <cstdint>
#include "absl/numeric/int128.h"
#include "absl/strings/string_view.h"
#include "quic/core/crypto/quic_decrypter.h"
#include "quic/core/quic_types.h"
#include "quic/platform/api/quic_export.h"
namespace quic {
class QuicDataReader;
// A NullDecrypter is a QuicDecrypter used before a crypto negotiation
// has occurred. It does not actually decrypt the payload, but does
// verify a hash (fnv128) over both the payload and associated data.
class QUIC_EXPORT_PRIVATE NullDecrypter : public QuicDecrypter {
explicit NullDecrypter(Perspective perspective);
NullDecrypter(const NullDecrypter&) = delete;
NullDecrypter& operator=(const NullDecrypter&) = delete;
~NullDecrypter() override {}
// QuicDecrypter implementation
bool SetKey(absl::string_view key) override;
bool SetNoncePrefix(absl::string_view nonce_prefix) override;
bool SetIV(absl::string_view iv) override;
bool SetHeaderProtectionKey(absl::string_view key) override;
bool SetPreliminaryKey(absl::string_view key) override;
bool SetDiversificationNonce(const DiversificationNonce& nonce) override;
bool DecryptPacket(uint64_t packet_number,
absl::string_view associated_data,
absl::string_view ciphertext,
char* output,
size_t* output_length,
size_t max_output_length) override;
std::string GenerateHeaderProtectionMask(
QuicDataReader* sample_reader) override;
size_t GetKeySize() const override;
size_t GetNoncePrefixSize() const override;
size_t GetIVSize() const override;
absl::string_view GetKey() const override;
absl::string_view GetNoncePrefix() const override;
uint32_t cipher_id() const override;
QuicPacketCount GetIntegrityLimit() const override;
bool ReadHash(QuicDataReader* reader, absl::uint128* hash);
absl::uint128 ComputeHash(absl::string_view data1,
absl::string_view data2) const;
Perspective perspective_;
} // namespace quic