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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 "net/third_party/quiche/src/quic/core/crypto/null_decrypter.h"
#include <cstdint>
#include "net/third_party/quiche/src/quic/core/quic_data_reader.h"
#include "net/third_party/quiche/src/quic/core/quic_utils.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"
namespace quic {
NullDecrypter::NullDecrypter(Perspective perspective)
: perspective_(perspective) {}
bool NullDecrypter::SetKey(QuicStringPiece key) {
return key.empty();
}
bool NullDecrypter::SetNoncePrefix(QuicStringPiece nonce_prefix) {
return nonce_prefix.empty();
}
bool NullDecrypter::SetIV(QuicStringPiece iv) {
return iv.empty();
}
bool NullDecrypter::SetPreliminaryKey(QuicStringPiece key) {
QUIC_BUG << "Should not be called";
return false;
}
bool NullDecrypter::SetDiversificationNonce(const DiversificationNonce& nonce) {
QUIC_BUG << "Should not be called";
return true;
}
bool NullDecrypter::DecryptPacket(QuicTransportVersion version,
uint64_t /*packet_number*/,
QuicStringPiece associated_data,
QuicStringPiece ciphertext,
char* output,
size_t* output_length,
size_t max_output_length) {
QuicDataReader reader(ciphertext.data(), ciphertext.length(),
HOST_BYTE_ORDER);
QuicUint128 hash;
if (!ReadHash(&reader, &hash)) {
return false;
}
QuicStringPiece plaintext = reader.ReadRemainingPayload();
if (plaintext.length() > max_output_length) {
QUIC_BUG << "Output buffer must be larger than the plaintext.";
return false;
}
if (hash != ComputeHash(version, associated_data, plaintext)) {
return false;
}
// Copy the plaintext to output.
memcpy(output, plaintext.data(), plaintext.length());
*output_length = plaintext.length();
return true;
}
size_t NullDecrypter::GetKeySize() const {
return 0;
}
size_t NullDecrypter::GetIVSize() const {
return 0;
}
QuicStringPiece NullDecrypter::GetKey() const {
return QuicStringPiece();
}
QuicStringPiece NullDecrypter::GetNoncePrefix() const {
return QuicStringPiece();
}
uint32_t NullDecrypter::cipher_id() const {
return 0;
}
bool NullDecrypter::ReadHash(QuicDataReader* reader, QuicUint128* hash) {
uint64_t lo;
uint32_t hi;
if (!reader->ReadUInt64(&lo) || !reader->ReadUInt32(&hi)) {
return false;
}
*hash = MakeQuicUint128(hi, lo);
return true;
}
QuicUint128 NullDecrypter::ComputeHash(QuicTransportVersion version,
const QuicStringPiece data1,
const QuicStringPiece data2) const {
QuicUint128 correct_hash;
if (version > QUIC_VERSION_35) {
if (perspective_ == Perspective::IS_CLIENT) {
// Peer is a server.
correct_hash = QuicUtils::FNV1a_128_Hash_Three(data1, data2, "Server");
} else {
// Peer is a client.
correct_hash = QuicUtils::FNV1a_128_Hash_Three(data1, data2, "Client");
}
} else {
correct_hash = QuicUtils::FNV1a_128_Hash_Two(data1, data2);
}
QuicUint128 mask = MakeQuicUint128(UINT64_C(0x0), UINT64_C(0xffffffff));
mask <<= 96;
correct_hash &= ~mask;
return correct_hash;
}
} // namespace quic