hash/hotp: add simple HOTP implementation
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@ -47,6 +47,8 @@ UTIL_FILES = \
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hash/fletcher.hpp \
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hash/fletcher.hpp \
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hash/hmac.cpp \
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hash/hmac.cpp \
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hash/hmac.hpp \
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hash/hmac.hpp \
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hash/hotp.cpp \
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hash/hotp.hpp \
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hash/md2.cpp \
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hash/md2.cpp \
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hash/md2.hpp \
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hash/md2.hpp \
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hash/md4.cpp \
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hash/md4.cpp \
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@ -241,6 +243,7 @@ TEST_BIN = \
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test/fixed \
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test/fixed \
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test/float \
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test/float \
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test/hmac \
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test/hmac \
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test/hotp \
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test/hton \
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test/hton \
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test/ip \
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test/ip \
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test/json_types \
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test/json_types \
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75
hash/hotp.cpp
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75
hash/hotp.cpp
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@ -0,0 +1,75 @@
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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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#include "hotp.hpp"
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#include "../endian.hpp"
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#include <cstring>
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using util::hash::HOTP;
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//-----------------------------------------------------------------------------
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HOTP::HOTP (const char *_key, uint64_t _counter):
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HOTP (_key, strlen (_key), _counter)
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{ ; }
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//-----------------------------------------------------------------------------
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HOTP::HOTP (const void *_key, size_t _len, uint64_t _counter):
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m_counter (_counter),
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m_hash ((const uint8_t*)_key, _len)
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{ ; }
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//-----------------------------------------------------------------------------
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unsigned
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HOTP::value (void)
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{
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auto c = htob (m_counter);
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m_hash.update (&c, sizeof (c));
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m_hash.finish ();
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auto h = m_hash.digest ();
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auto t = truncate (h);
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m_hash.reset ();
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++m_counter;
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return t % 1000000;
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}
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//-----------------------------------------------------------------------------
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uint32_t
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HOTP::truncate (SHA1::digest_t d)
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{
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// offset into the digest by the last 4 bits
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size_t o= d[d.size () - 1] & 0x0F;
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// mask the highest bit per the specification
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uint32_t v = (d[o + 0] & 0x7f) << 24 |
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(d[o + 1] & 0xff) << 16 |
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(d[o + 2] & 0xff) << 8 |
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(d[o + 3] & 0xff) << 0;
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return v;
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}
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46
hash/hotp.hpp
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46
hash/hotp.hpp
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@ -0,0 +1,46 @@
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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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28
test/hotp.cpp
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28
test/hotp.cpp
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@ -0,0 +1,28 @@
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#include "hash/hotp.hpp"
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#include "types.hpp"
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#include "debug.hpp"
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using util::hash::HOTP;
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int
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main (int, char**)
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{
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HOTP h ("12345678901234567890", 0);
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const unsigned EXPECTED[] = {
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755224,
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287082,
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359152,
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969429,
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338314,
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254676,
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287922,
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162583,
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399871,
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520489,
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};
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for (size_t i = 0; i < elems (EXPECTED); ++i)
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CHECK_EQ (EXPECTED[i], h.value ());
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}
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