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// Copyright (c) 2013 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 "quic/core/crypto/chacha_base_encrypter.h"
#include "absl/base/macros.h"
#include "absl/strings/string_view.h"
#include "third_party/boringssl/src/include/openssl/chacha.h"
#include "quic/core/quic_data_reader.h"
#include "quic/platform/api/quic_bug_tracker.h"
#include "common/quiche_endian.h"
namespace quic {
bool ChaChaBaseEncrypter::SetHeaderProtectionKey(absl::string_view key) {
if (key.size() != GetKeySize()) {
QUIC_BUG << "Invalid key size for header protection";
return false;
}
memcpy(pne_key_, key.data(), key.size());
return true;
}
std::string ChaChaBaseEncrypter::GenerateHeaderProtectionMask(
absl::string_view sample) {
if (sample.size() != 16) {
return std::string();
}
const uint8_t* nonce = reinterpret_cast<const uint8_t*>(sample.data()) + 4;
uint32_t counter;
QuicDataReader(sample.data(), 4, quiche::HOST_BYTE_ORDER)
.ReadUInt32(&counter);
const uint8_t zeroes[] = {0, 0, 0, 0, 0};
std::string out(ABSL_ARRAYSIZE(zeroes), 0);
CRYPTO_chacha_20(reinterpret_cast<uint8_t*>(const_cast<char*>(out.data())),
zeroes, ABSL_ARRAYSIZE(zeroes), pne_key_, nonce, counter);
return out;
}
} // namespace quic
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