37 lines
802 B
C++
37 lines
802 B
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_CRYPTO_HASH_HOTP_HPP
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#define CRUFT_CRYPTO_HASH_HOTP_HPP
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#include <cruft/util/view.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 cruft::crypto::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 (util::view<const char*> key, 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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