hash/hmac: add simple HMAC-MD5
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277354807e
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@ -45,6 +45,8 @@ UTIL_FILES = \
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hash/crc.cpp \
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hash/crc.hpp \
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hash/fletcher.hpp \
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hash/hmac.cpp \
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hash/hmac.hpp \
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hash/md2.cpp \
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hash/md2.hpp \
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hash/md4.cpp \
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@ -238,6 +240,7 @@ TEST_BIN = \
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test/extent \
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test/fixed \
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test/float \
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test/hmac \
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test/hton \
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test/ip \
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test/json_types \
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102
hash/hmac.cpp
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102
hash/hmac.cpp
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@ -0,0 +1,102 @@
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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 "hmac.hpp"
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#include "debug.hpp"
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#include <algorithm>
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using util::hash::HMAC;
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//-----------------------------------------------------------------------------
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static const uint8_t IFILL = 0x36;
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static const uint8_t OFILL = 0x5C;
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//-----------------------------------------------------------------------------
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HMAC::HMAC (const uint8_t *restrict key, size_t len)
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{
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CHECK (key);
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CHECK_LE (len, m_ikey.size ());
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CHECK_LE (len, m_okey.size ());
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static_assert (sizeof (m_ikey) == sizeof (m_okey), "key padding must match");
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std::copy (key, key + len, m_ikey.begin ());
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std::fill (m_ikey.begin () + len,
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m_ikey.end (),
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0);
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m_okey = m_ikey;
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std::transform (m_ikey.begin (),
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m_ikey.end (),
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m_ikey.begin (),
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[] (auto v) { return v ^ IFILL; });
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std::transform (m_okey.begin (),
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m_okey.end (),
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m_okey.begin (),
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[] (auto v) { return v ^ OFILL; });
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m_hash.update (m_ikey.data (), m_ikey.size ());
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}
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//-----------------------------------------------------------------------------
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void
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HMAC::update (const void *restrict data, size_t len)
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{
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m_hash.update ((const uint8_t*)data, len);
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}
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//-----------------------------------------------------------------------------
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void
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HMAC::finish (void)
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{
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m_hash.finish ();
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auto d = m_hash.digest ();
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m_hash.reset ();
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m_hash.update (m_okey.data (), m_okey.size ());
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m_hash.update (d.data (), d.size ());
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m_hash.finish ();
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}
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//-----------------------------------------------------------------------------
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void
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HMAC::reset (void)
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{
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m_hash.reset ();
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m_hash.update (m_ikey.data (), m_ikey.size ());
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}
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//-----------------------------------------------------------------------------
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HMAC::digest_t
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HMAC::digest (void)
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{
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return m_hash.digest ();
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}
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47
hash/hmac.hpp
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47
hash/hmac.hpp
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@ -0,0 +1,47 @@
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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_HMAC_HPP
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#define __UTIL_HASH_HMAC_HPP
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#include "md5.hpp"
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namespace util { namespace hash {
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/// RFC 2104 key-hashing for message authentication
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class HMAC {
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public:
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using digest_t = MD5::digest_t;
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HMAC (const uint8_t *key, size_t);
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void update (const void *restrict, size_t);
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void finish (void);
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void reset (void);
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digest_t digest (void);
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private:
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std::array<uint8_t,64> m_ikey;
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std::array<uint8_t,64> m_okey;
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MD5 m_hash;
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};
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} }
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#endif
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67
test/hmac.cpp
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67
test/hmac.cpp
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@ -0,0 +1,67 @@
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#include "hash/hmac.hpp"
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#include "types.hpp"
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#include "debug.hpp"
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#include <iostream>
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#include <vector>
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using util::hash::HMAC;
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static const struct {
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std::vector<uint8_t> key;
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std::vector<uint8_t> dat;
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HMAC::digest_t res;
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} TESTS[] = {
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// RFC 2104 test data, MD5
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{
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{ 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
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0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b },
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{ 'H', 'i', ' ', 'T', 'h', 'e', 'r', 'e' },
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{ { 0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
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0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d } }
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},
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{
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{ 'J', 'e', 'f', 'e' },
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{ 'w', 'h', 'a', 't', ' ', 'd', 'o', ' ',
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'y', 'a', ' ', 'w', 'a', 'n', 't', ' ',
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'f', 'o', 'r', ' ', 'n', 'o', 't', 'h',
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'i', 'n', 'g', '?' },
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{ { 0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
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0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 } }
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},
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{
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{ 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA },
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{ 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD, 0xDD,
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0xDD, 0xDD },
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{ { 0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
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0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 } }
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}
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};
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int
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main (int, char**)
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{
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for (const auto &t: TESTS) {
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util::hash::HMAC h (t.key.data (), t.key.size ());
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h.update (t.dat.data (), t.dat.size ());
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h.finish ();
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if (h.digest () != t.res)
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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