45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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