md5.h
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1 /*
2  * Copyright (C) 2011 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #ifndef CXXTOOLS_MD5_H
30 #define CXXTOOLS_MD5_H
31 
32 #include <cxxtools/md5stream.h>
33 #include <iterator>
34 #include <algorithm>
35 
36 namespace cxxtools
37 {
38 
39 template <typename iterator_type>
40 std::string md5(iterator_type from, iterator_type to)
41 {
42  Md5stream s;
43  std::copy(from, to, std::ostream_iterator<char>(s));
44  return s.getHexDigest();
45 }
46 
47 template <typename data_type>
48 std::string md5(const data_type& data)
49 {
50  Md5stream s;
51  s << data;
52  return s.getHexDigest();
53 }
54 
55 template <typename data_type> class md5_hash
56 {
57  std::string digest;
58 
59 public:
60  explicit md5_hash(const data_type& data)
61  {
62  unsigned char _digest[16];
63  Md5stream s;
64  s << data;
65  s.getDigest(_digest);
66  digest.assign(reinterpret_cast<char*>(&_digest[0]), reinterpret_cast<char*>(&_digest[0] + 16));
67  }
68 
69  md5_hash(typename data_type::const_iterator from,
70  typename data_type::const_iterator to)
71  {
72  unsigned char _digest[16];
73  Md5stream s;
74  std::copy(from, to, std::ostream_iterator<char>(s));
75  s.getDigest(_digest);
76  digest.assign(reinterpret_cast<char*>(&_digest[0]), reinterpret_cast<char*>(&_digest[0] + 16));
77  }
78 
79  static const unsigned short blockSize = 64;
80 
81  std::string getHexDigest() const
82  {
83  static const char hex[] = "0123456789abcdef";
84  std::string ret;
85  ret.reserve(32);
86  for (unsigned n = 0; n < 16; ++n)
87  {
88  ret.push_back(hex[(digest[n] >> 4) & 0xf]);
89  ret.push_back(hex[digest[n] & 0xf]);
90  }
91  return ret;
92  }
93 
94  std::string getDigest() const
95  { return digest; }
96 };
97 
98 }
99 
100 #endif // CXXTOOLS_MD5_H