text: // 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 "net/third_party/quiche/src/quic/core/crypto/quic_decrypter.h"
  
  #include "third_party/boringssl/src/include/openssl/tls1.h"
  #include "net/third_party/quiche/src/quic/core/crypto/aes_128_gcm_12_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/aes_128_gcm_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/aes_256_gcm_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/chacha20_poly1305_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/chacha20_poly1305_tls_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
  #include "net/third_party/quiche/src/quic/core/crypto/null_decrypter.h"
  #include "net/third_party/quiche/src/quic/core/crypto/quic_hkdf.h"
  #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
  #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
  #include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
  #include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
  
  namespace quic {
  
  // static
  std::unique_ptr<QuicDecrypter> QuicDecrypter::Create(QuicTag algorithm) {
    switch (algorithm) {
      case kAESG:
        return QuicMakeUnique<Aes128Gcm12Decrypter>();
      case kCC20:
        return QuicMakeUnique<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 QuicMakeUnique<Aes128GcmDecrypter>();
      case TLS1_CK_AES_256_GCM_SHA384:
        return QuicMakeUnique<Aes256GcmDecrypter>();
      case TLS1_CK_CHACHA20_POLY1305_SHA256:
        return QuicMakeUnique<ChaCha20Poly1305TlsDecrypter>();
      default:
        QUIC_BUG << "TLS cipher suite is unknown to QUIC";
        return nullptr;
    }
  }
  
  // static
  void QuicDecrypter::DiversifyPreliminaryKey(QuicStringPiece preliminary_key,
                                              QuicStringPiece nonce_prefix,
                                              const DiversificationNonce& nonce,
                                              size_t key_size,
                                              size_t nonce_prefix_size,
                                              QuicString* out_key,
                                              QuicString* out_nonce_prefix) {
    QuicHKDF hkdf((QuicString(preliminary_key)) + (QuicString(nonce_prefix)),
                  QuicStringPiece(nonce.data(), nonce.size()),
                  "QUIC key diversification", 0, key_size, 0, nonce_prefix_size,
                  0);
    *out_key = QuicString(hkdf.server_write_key());
    *out_nonce_prefix = QuicString(hkdf.server_write_iv());
  }
  
  }  // namespace quic
  