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// Copyright 2016 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 <string>
#include "quic/core/crypto/quic_compressed_certs_cache.h"
namespace quic {
namespace {
// Inline helper function for extending a 64-bit |seed| in-place with a 64-bit
// |value|. Based on Boost's hash_combine function.
inline void hash_combine(uint64_t* seed, const uint64_t& val) {
(*seed) ^= val + 0x9e3779b9 + ((*seed) << 6) + ((*seed) >> 2);
}
} // namespace
const size_t QuicCompressedCertsCache::kQuicCompressedCertsCacheSize = 225;
QuicCompressedCertsCache::UncompressedCerts::UncompressedCerts()
: chain(nullptr),
client_common_set_hashes(nullptr),
client_cached_cert_hashes(nullptr) {}
QuicCompressedCertsCache::UncompressedCerts::UncompressedCerts(
const QuicReferenceCountedPointer<ProofSource::Chain>& chain,
const std::string* client_common_set_hashes,
const std::string* client_cached_cert_hashes)
: chain(chain),
client_common_set_hashes(client_common_set_hashes),
client_cached_cert_hashes(client_cached_cert_hashes) {}
QuicCompressedCertsCache::UncompressedCerts::~UncompressedCerts() {}
QuicCompressedCertsCache::CachedCerts::CachedCerts() {}
QuicCompressedCertsCache::CachedCerts::CachedCerts(
const UncompressedCerts& uncompressed_certs,
const std::string& compressed_cert)
: chain_(uncompressed_certs.chain),
client_common_set_hashes_(*uncompressed_certs.client_common_set_hashes),
client_cached_cert_hashes_(*uncompressed_certs.client_cached_cert_hashes),
compressed_cert_(compressed_cert) {}
QuicCompressedCertsCache::CachedCerts::CachedCerts(const CachedCerts& other) =
default;
QuicCompressedCertsCache::CachedCerts::~CachedCerts() {}
bool QuicCompressedCertsCache::CachedCerts::MatchesUncompressedCerts(
const UncompressedCerts& uncompressed_certs) const {
return (client_common_set_hashes_ ==
*uncompressed_certs.client_common_set_hashes &&
client_cached_cert_hashes_ ==
*uncompressed_certs.client_cached_cert_hashes &&
chain_ == uncompressed_certs.chain);
}
const std::string* QuicCompressedCertsCache::CachedCerts::compressed_cert()
const {
return &compressed_cert_;
}
QuicCompressedCertsCache::QuicCompressedCertsCache(int64_t max_num_certs)
: certs_cache_(max_num_certs) {}
QuicCompressedCertsCache::~QuicCompressedCertsCache() {
// Underlying cache must be cleared before destruction.
certs_cache_.Clear();
}
const std::string* QuicCompressedCertsCache::GetCompressedCert(
const QuicReferenceCountedPointer<ProofSource::Chain>& chain,
const std::string& client_common_set_hashes,
const std::string& client_cached_cert_hashes) {
UncompressedCerts uncompressed_certs(chain, &client_common_set_hashes,
&client_cached_cert_hashes);
uint64_t key = ComputeUncompressedCertsHash(uncompressed_certs);
CachedCerts* cached_value = nullptr;
auto iter = certs_cache_.Lookup(key);
if (iter != certs_cache_.end()) {
cached_value = iter->second.get();
}
if (cached_value != nullptr &&
cached_value->MatchesUncompressedCerts(uncompressed_certs)) {
return cached_value->compressed_cert();
}
return nullptr;
}
void QuicCompressedCertsCache::Insert(
const QuicReferenceCountedPointer<ProofSource::Chain>& chain,
const std::string& client_common_set_hashes,
const std::string& client_cached_cert_hashes,
const std::string& compressed_cert) {
UncompressedCerts uncompressed_certs(chain, &client_common_set_hashes,
&client_cached_cert_hashes);
uint64_t key = ComputeUncompressedCertsHash(uncompressed_certs);
// Insert one unit to the cache.
std::unique_ptr<CachedCerts> cached_certs(
new CachedCerts(uncompressed_certs, compressed_cert));
certs_cache_.Insert(key, std::move(cached_certs));
}
size_t QuicCompressedCertsCache::MaxSize() {
return certs_cache_.MaxSize();
}
size_t QuicCompressedCertsCache::Size() {
return certs_cache_.Size();
}
uint64_t QuicCompressedCertsCache::ComputeUncompressedCertsHash(
const UncompressedCerts& uncompressed_certs) {
uint64_t hash =
std::hash<std::string>()(*uncompressed_certs.client_common_set_hashes);
uint64_t h =
std::hash<std::string>()(*uncompressed_certs.client_cached_cert_hashes);
hash_combine(&hash, h);
hash_combine(&hash,
reinterpret_cast<uint64_t>(uncompressed_certs.chain.get()));
return hash;
}
} // namespace quic