| /** @file |
| * |
| * A brief file description |
| * |
| * @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 "QUICRetryIntegrityTag.h" |
| |
| bool |
| QUICRetryIntegrityTag::compute(uint8_t *out, QUICConnectionId odcid, Ptr<IOBufferBlock> header, Ptr<IOBufferBlock> payload) |
| { |
| EVP_CIPHER_CTX *aead_ctx; |
| |
| if (!(aead_ctx = EVP_CIPHER_CTX_new())) { |
| return false; |
| } |
| if (!EVP_EncryptInit_ex(aead_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr)) { |
| return false; |
| } |
| if (!EVP_CIPHER_CTX_ctrl(aead_ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, nullptr)) { |
| return false; |
| } |
| if (!EVP_EncryptInit_ex(aead_ctx, nullptr, nullptr, KEY_FOR_RETRY_INTEGRITY_TAG, NONCE_FOR_RETRY_INTEGRITY_TAG)) { |
| return false; |
| } |
| |
| // Original Destination Connection ID |
| size_t n; |
| int dummy; |
| uint8_t odcid_buf[1 + QUICConnectionId::MAX_LENGTH]; |
| // Len |
| odcid_buf[0] = odcid.length(); |
| // ID |
| QUICTypeUtil::write_QUICConnectionId(odcid, odcid_buf + 1, &n); |
| if (!EVP_EncryptUpdate(aead_ctx, nullptr, &dummy, odcid_buf, 1 + odcid.length())) { |
| return false; |
| } |
| |
| // Retry Packet |
| for (Ptr<IOBufferBlock> b = header; b; b = b->next) { |
| if (!EVP_EncryptUpdate(aead_ctx, nullptr, &dummy, reinterpret_cast<unsigned char *>(b->start()), b->size())) { |
| return false; |
| } |
| } |
| for (Ptr<IOBufferBlock> b = payload; b; b = b->next) { |
| if (!EVP_EncryptUpdate(aead_ctx, nullptr, &dummy, reinterpret_cast<unsigned char *>(b->start()), b->size())) { |
| return false; |
| } |
| } |
| |
| if (!EVP_EncryptFinal_ex(aead_ctx, nullptr, &dummy)) { |
| return false; |
| } |
| |
| if (!EVP_CIPHER_CTX_ctrl(aead_ctx, EVP_CTRL_AEAD_GET_TAG, LEN, out)) { |
| return false; |
| } |
| |
| EVP_CIPHER_CTX_free(aead_ctx); |
| |
| return true; |
| } |