| // 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_decrypter.h" |
| |
| #include <cstdint> |
| |
| #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 ChaChaBaseDecrypter::SetHeaderProtectionKey(absl::string_view key) { |
| if (key.size() != GetKeySize()) { |
| QUIC_BUG(quic_bug_10620_1) << "Invalid key size for header protection"; |
| return false; |
| } |
| memcpy(pne_key_, key.data(), key.size()); |
| return true; |
| } |
| |
| std::string ChaChaBaseDecrypter::GenerateHeaderProtectionMask( |
| QuicDataReader* sample_reader) { |
| absl::string_view sample; |
| if (!sample_reader->ReadStringPiece(&sample, 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 |