| /** @file |
| |
| HKDF utility |
| |
| @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. |
| */ |
| |
| #pragma once |
| |
| #ifdef OPENSSL_IS_BORINGSSL |
| #include <openssl/digest.h> |
| #include <openssl/cipher.h> |
| #else |
| #include <openssl/evp.h> |
| #endif |
| |
| class HKDF |
| { |
| public: |
| HKDF(const EVP_MD *digest); |
| ~HKDF(); |
| int extract(uint8_t *dst, size_t *dst_len, const uint8_t *salt, size_t salt_len, const uint8_t *ikm, size_t ikm_len); |
| int expand(uint8_t *dst, size_t *dst_len, const uint8_t *prk, size_t prk_len, const uint8_t *info, size_t info_len, |
| uint16_t length); |
| |
| protected: |
| const EVP_MD *_digest = nullptr; |
| EVP_PKEY_CTX *_pctx = nullptr; |
| }; |