47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
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/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_HASH_HOTP_HPP
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#define __UTIL_HASH_HOTP_HPP
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#include "hmac.hpp"
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#include "sha1.hpp"
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#include <cstdint>
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namespace util { namespace hash {
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/// HMAC one-time password (RFC 4226)
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class HOTP {
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public:
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HOTP (const char *key, uint64_t counter);
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HOTP (const void *key, size_t len, uint64_t counter);
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unsigned value (void);
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uint64_t counter (void) const;
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private:
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uint32_t truncate (SHA1::digest_t);
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uint64_t m_counter;
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HMAC<SHA1> m_hash;
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};
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} }
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#endif
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