include/libtorrent/hasher.hpp

   1 /*
   2
   3 Copyright (c) 2003, Arvid Norberg
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions
   8 are met:
   9
  10     * Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12     * Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in
  14       the documentation and/or other materials provided with the distribution.
  15     * Neither the name of the author nor the names of its
  16       contributors may be used to endorse or promote products derived
  17       from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 POSSIBILITY OF SUCH DAMAGE.
  30
  31 */
  32
  33 #ifndef TORRENT_HASHER_HPP_INCLUDED
  34 #define TORRENT_HASHER_HPP_INCLUDED
  35
  36 #include <boost/cstdint.hpp>
  37
  38 #include "libtorrent/peer_id.hpp"
  39 #include "libtorrent/config.hpp"
  40 #include "libtorrent/assert.hpp"
  41 #include "zlib.h"
  42
  43 #ifdef TORRENT_USE_OPENSSL
  44 extern "C"
  45 {
  46 #include <openssl/sha.h>
  47 }
  48 #else
  49 // from sha1.cpp
  50 struct TORRENT_EXPORT SHA_CTX
  51 {
  52         boost::uint32_t state[5];
  53         boost::uint32_t count[2];
  54         boost::uint8_t buffer[64];
  55 };
  56
  57 TORRENT_EXPORT void SHA1_Init(SHA_CTX* context);
  58 TORRENT_EXPORT void SHA1_Update(SHA_CTX* context, boost::uint8_t const* data, boost::uint32_t len);
  59 TORRENT_EXPORT void SHA1_Final(boost::uint8_t* digest, SHA_CTX* context);
  60
  61 #endif
  62
  63 namespace libtorrent
  64 {
  65
  66         class adler32_crc
  67         {
  68         public:
  69                 adler32_crc(): m_adler(adler32(0, 0, 0)) {}
  70
  71                 void update(const char* data, int len)
  72                 {
  73                         TORRENT_ASSERT(data != 0);
  74                         TORRENT_ASSERT(len > 0);
  75                         m_adler = adler32(m_adler, (const Bytef*)data, len);
  76                 }
  77                 unsigned long final() const { return m_adler; }
  78                 void reset() { m_adler = adler32(0, 0, 0); }
  79
  80         private:
  81
  82                 unsigned long m_adler;
  83
  84         };
  85
  86         class hasher
  87         {
  88         public:
  89
  90                 hasher() { SHA1_Init(&m_context); }
  91                 hasher(const char* data, int len)
  92                 {
  93                         SHA1_Init(&m_context);
  94                         TORRENT_ASSERT(data != 0);
  95                         TORRENT_ASSERT(len > 0);
  96                         SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
  97                 }
  98                 void update(const char* data, int len)
  99                 {
 100                         TORRENT_ASSERT(data != 0);
 101                         TORRENT_ASSERT(len > 0);
 102                         SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
 103                 }
 104
 105                 sha1_hash final()
 106                 {
 107                         sha1_hash digest;
 108                         SHA1_Final(digest.begin(), &m_context);
 109                         return digest;
 110                 }
 111
 112                 void reset() { SHA1_Init(&m_context); }
 113
 114         private:
 115
 116                 SHA_CTX m_context;
 117
 118         };
 119 }
 120
 121 #endif // TORRENT_HASHER_HPP_INCLUDED
 122