| /** @file |
| * |
| * QUIC Packet Header Protector (OpenSSL specific code) |
| * |
| * @section license License |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "QUICPacketHeaderProtector.h" |
| |
| bool |
| QUICPacketHeaderProtector::_generate_mask(uint8_t *mask, const uint8_t *sample, const uint8_t *key, const EVP_CIPHER *cipher) const |
| { |
| static constexpr unsigned char FIVE_ZEROS[] = {0x00, 0x00, 0x00, 0x00, 0x00}; |
| EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new(); |
| |
| if (!ctx) { |
| return false; |
| } |
| if (!EVP_EncryptInit_ex(ctx, cipher, nullptr, key, sample)) { |
| EVP_CIPHER_CTX_free(ctx); |
| return false; |
| } |
| |
| int len = 0; |
| if (cipher == EVP_chacha20()) { |
| if (!EVP_EncryptUpdate(ctx, mask, &len, FIVE_ZEROS, sizeof(FIVE_ZEROS))) { |
| EVP_CIPHER_CTX_free(ctx); |
| return false; |
| } |
| } else { |
| if (!EVP_EncryptUpdate(ctx, mask, &len, sample, 16)) { |
| EVP_CIPHER_CTX_free(ctx); |
| return false; |
| } |
| } |
| if (!EVP_EncryptFinal_ex(ctx, mask + len, &len)) { |
| EVP_CIPHER_CTX_free(ctx); |
| return false; |
| } |
| |
| EVP_CIPHER_CTX_free(ctx); |
| |
| return true; |
| } |