Line data    Source code

       1             : /* Copyright (C) 2010 Wildfire Games.
       2             :  * This file is part of 0 A.D.
       3             :  *
       4             :  * 0 A.D. is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 2 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * 0 A.D. is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #ifndef INCLUDED_MD5
      19             : #define INCLUDED_MD5
      20             : 
      21             : #include <cstring>
      22             : 
      23             : /**
      24             :  * MD5 hashing algorithm. Note that MD5 is broken and must not be used for
      25             :  * anything that requires security.
      26             :  */
      27             : class MD5
      28             : {
      29             : public:
      30             :     static const size_t DIGESTSIZE = 16;
      31             : 
      32             :     MD5();
      33             : 
      34       19876 :     void Update(const u8* data, size_t len)
      35             :     {
      36             :         // (Defined inline for efficiency in the common fixed-length fits-in-buffer case)
      37             : 
      38       19876 :         const size_t CHUNK_SIZE = sizeof(m_Buf);
      39             : 
      40       19876 :         m_InputLen += len;
      41             : 
      42             :         // If we have enough space in m_Buf and won't flush, simply append the input
      43       19876 :         if (m_BufLen + len < CHUNK_SIZE)
      44             :         {
      45       19243 :             memcpy(m_Buf + m_BufLen, data, len);
      46       19243 :             m_BufLen += len;
      47       19243 :             return;
      48             :         }
      49             : 
      50             :         // Fall back to non-inline function if we have to do more work
      51         633 :         UpdateRest(data, len);
      52             :     }
      53             : 
      54             :     void Final(u8* digest);
      55             : 
      56             : private:
      57             :     void InitState();
      58             :     void UpdateRest(const u8* data, size_t len);
      59             :     void Transform(const u32* in);
      60             :     u32 m_Digest[4]; // internal state
      61             :     u8 m_Buf[64]; // buffered input bytes
      62             :     size_t m_BufLen; // bytes in m_Buf that are valid
      63             :     u64 m_InputLen; // bytes
      64             : };
      65             : 
      66             : #endif // INCLUDED_MD5