libcruft-util/hash/hotp.hpp

44 lines
1.1 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_HOTP_HPP
#define __UTIL_HASH_HOTP_HPP
#include "hmac.hpp"
#include "sha1.hpp"
#include <cstdint>
namespace util::hash {
/// HMAC one-time password (RFC 4226)
class HOTP {
public:
HOTP (const char *key, uint64_t counter);
HOTP (const void *key, size_t len, uint64_t counter);
unsigned value (void);
uint64_t counter (void) const;
private:
uint32_t truncate (SHA1::digest_t);
uint64_t m_counter;
HMAC<SHA1> m_hash;
};
}
#endif