/usr/include/cxxtools/hmac.h is in libcxxtools-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | /*
* Copyright (C) 2011 by Julian Wiesener
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* HMAC algorithm as described by RFC 2104
* http://tools.ietf.org/html/rfc2104
*/
#ifndef CXXTOOLS_HMAC_H
#define CXXTOOLS_HMAC_H
#include <sstream>
#include <algorithm>
namespace cxxtools
{
template <typename Algo>
void hmac_pad_key(Algo& key_hash, const std::string& key, std::string& o_key_pad, std::string& i_key_pad)
{
std::string _key(key);
if(key.length() > Algo::blockSize)
_key = key_hash.getDigest();
_key.resize(Algo::blockSize);
std::string::const_iterator key_it = _key.begin();
for(std::string::iterator pad_it = o_key_pad.begin();
pad_it != o_key_pad.end(); pad_it++)
*pad_it = *pad_it ^ *key_it++;
key_it = _key.begin();
for(std::string::iterator pad_it = i_key_pad.begin();
pad_it != i_key_pad.end(); pad_it++)
*pad_it = *pad_it ^ *key_it++;
}
template <typename Algo, typename data_type>
std::string hmac(const std::string& key, const data_type& msg)
{
Algo key_hash(key);
std::string o_key_pad(Algo::blockSize, 0x5c);
std::string i_key_pad(Algo::blockSize, 0x36);
cxxtools::hmac_pad_key(key_hash, key, o_key_pad, i_key_pad);
Algo inner_hash(i_key_pad + msg);
Algo outer_hash(o_key_pad + inner_hash.getDigest());
return outer_hash.getHexDigest();
}
template <typename Algo, typename iterator_type>
std::string hmac(const std::string& key,
iterator_type from, iterator_type to)
{
Algo key_hash(key);
std::string o_key_pad(Algo::blockSize, 0x5c);
std::string i_key_pad(Algo::blockSize, 0x36);
std::stringstream is;
cxxtools::hmac_pad_key(key_hash, key, o_key_pad, i_key_pad);
std::copy(from, to, std::ostreambuf_iterator<char>(is));
Algo inner_hash(i_key_pad + is.str());
Algo outer_hash(o_key_pad + inner_hash.getDigest());
return outer_hash.getHexDigest();
}
}
#endif // CXXTOOLS_HMAC_H
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