libcruft-util/hash/hmac.hpp

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/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_HASH_HMAC_HPP
#define __UTIL_HASH_HMAC_HPP
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#include <array>
#include <cstdint>
#include <cstdlib>
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namespace util { namespace hash {
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template <class T>
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/// RFC 2104 key-hashing for message authentication
class HMAC {
public:
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using digest_t = typename T::digest_t;
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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:
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std::array<uint8_t,T::BLOCK_SIZE> m_ikey;
std::array<uint8_t,T::BLOCK_SIZE> m_okey;
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T m_hash;
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};
} }
#endif