libcruft-util/hash/hmac.hpp

48 lines
1.2 KiB
C++

/*
* Licensed 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.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_HASH_HMAC_HPP
#define __UTIL_HASH_HMAC_HPP
#include <array>
#include <cstdint>
#include <cstdlib>
namespace util::hash {
template <class T>
/// RFC 2104 key-hashing for message authentication
class HMAC {
public:
using digest_t = typename T::digest_t;
HMAC (const uint8_t *key, size_t);
void update (const void *restrict, size_t);
void finish (void);
void reset (void);
digest_t digest (void);
private:
std::array<uint8_t,T::BLOCK_SIZE> m_ikey;
std::array<uint8_t,T::BLOCK_SIZE> m_okey;
T m_hash;
};
}
#endif