blob: 2e3fe422f05fe62e896ef0977169fd7b066429f9 [file] [log] [blame]
// 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 <string>
#include <vector>
#include "absl/strings/string_view.h"
#include "quiche/quic/core/crypto/crypto_protocol.h"
#include "quiche/quic/platform/api/quic_export.h"
namespace quic {
// CertCompressor provides functions for compressing and decompressing
// certificate chains using two techniquies:
// 1) The peer may provide a list of a 64-bit, FNV-1a hashes of certificates
// that they already have. In the event that one of them is to be
// compressed, it can be replaced with just the hash.
// 2) Otherwise the certificates are compressed with zlib using a pre-shared
// dictionary that consists of the certificates handled with the above
// methods and a small chunk of common substrings.
class QUICHE_EXPORT CertCompressor {
CertCompressor() = delete;
// CompressChain compresses the certificates in |certs| and returns a
// compressed representation. client_cached_cert_hashes| contains
// 64-bit, FNV-1a hashes of certificates that the peer already possesses.
static std::string CompressChain(const std::vector<std::string>& certs,
absl::string_view client_cached_cert_hashes);
// DecompressChain decompresses the result of |CompressChain|, given in |in|,
// into a series of certificates that are written to |out_certs|.
// |cached_certs| contains certificates that the peer may have omitted.
static bool DecompressChain(absl::string_view in,
const std::vector<std::string>& cached_certs,
std::vector<std::string>* out_certs);
} // namespace quic