| // 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 "quiche/quic/core/crypto/quic_decrypter.h" |
| |
| #include <string> |
| #include <utility> |
| |
| #include "absl/strings/string_view.h" |
| #include "openssl/tls1.h" |
| #include "quiche/quic/core/crypto/aes_128_gcm_12_decrypter.h" |
| #include "quiche/quic/core/crypto/aes_128_gcm_decrypter.h" |
| #include "quiche/quic/core/crypto/aes_256_gcm_decrypter.h" |
| #include "quiche/quic/core/crypto/chacha20_poly1305_decrypter.h" |
| #include "quiche/quic/core/crypto/chacha20_poly1305_tls_decrypter.h" |
| #include "quiche/quic/core/crypto/crypto_protocol.h" |
| #include "quiche/quic/core/crypto/null_decrypter.h" |
| #include "quiche/quic/core/crypto/quic_hkdf.h" |
| #include "quiche/quic/platform/api/quic_bug_tracker.h" |
| #include "quiche/quic/platform/api/quic_logging.h" |
| |
| namespace quic { |
| |
| // static |
| std::unique_ptr<QuicDecrypter> QuicDecrypter::Create( |
| const ParsedQuicVersion& version, QuicTag algorithm) { |
| switch (algorithm) { |
| case kAESG: |
| if (version.UsesInitialObfuscators()) { |
| return std::make_unique<Aes128GcmDecrypter>(); |
| } else { |
| return std::make_unique<Aes128Gcm12Decrypter>(); |
| } |
| case kCC20: |
| if (version.UsesInitialObfuscators()) { |
| return std::make_unique<ChaCha20Poly1305TlsDecrypter>(); |
| } else { |
| return std::make_unique<ChaCha20Poly1305Decrypter>(); |
| } |
| default: |
| QUIC_LOG(FATAL) << "Unsupported algorithm: " << algorithm; |
| return nullptr; |
| } |
| } |
| |
| // static |
| std::unique_ptr<QuicDecrypter> QuicDecrypter::CreateFromCipherSuite( |
| uint32_t cipher_suite) { |
| switch (cipher_suite) { |
| case TLS1_CK_AES_128_GCM_SHA256: |
| return std::make_unique<Aes128GcmDecrypter>(); |
| case TLS1_CK_AES_256_GCM_SHA384: |
| return std::make_unique<Aes256GcmDecrypter>(); |
| case TLS1_CK_CHACHA20_POLY1305_SHA256: |
| return std::make_unique<ChaCha20Poly1305TlsDecrypter>(); |
| default: |
| QUIC_BUG(quic_bug_10660_1) << "TLS cipher suite is unknown to QUIC"; |
| return nullptr; |
| } |
| } |
| |
| // static |
| void QuicDecrypter::DiversifyPreliminaryKey(absl::string_view preliminary_key, |
| absl::string_view nonce_prefix, |
| const DiversificationNonce& nonce, |
| size_t key_size, |
| size_t nonce_prefix_size, |
| std::string* out_key, |
| std::string* out_nonce_prefix) { |
| QuicHKDF hkdf((std::string(preliminary_key)) + (std::string(nonce_prefix)), |
| absl::string_view(nonce.data(), nonce.size()), |
| "QUIC key diversification", 0, key_size, 0, nonce_prefix_size, |
| 0); |
| *out_key = std::string(hkdf.server_write_key()); |
| *out_nonce_prefix = std::string(hkdf.server_write_iv()); |
| } |
| |
| } // namespace quic |