xapian-applications/omega/md5wrap.cc

   1 /** @file md5wrap.cc
   2  * @brief wrapper functions to allow easy use of MD5 from C++.
   3  */
   4 /* Copyright (C) 2006,2010,2012,2013,2015,2018 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <config.h>
  22
  23 #include "md5wrap.h"
  24
  25 #include <cerrno>
  26 #include <string>
  27
  28 #include "safeunistd.h"
  29
  30 #include "md5.h"
  31
  32 using namespace std;
  33
  34 bool
  35 md5_fd(int fd, string& md5)
  36 {
  37     MD5Context md5_ctx;
  38     MD5Init(&md5_ctx);
  39
  40     unsigned char blk[4096];
  41
  42     while (true) {
  43         int c = read(fd, blk, sizeof(blk));
  44         if (c == 0) break;
  45         if (c < 0) {
  46             if (errno == EINTR) continue;
  47             return false;
  48         }
  49         MD5Update(&md5_ctx, blk, c);
  50     }
  51
  52     MD5Final(blk, &md5_ctx);
  53     md5.assign(reinterpret_cast<const char*>(blk), 16);
  54
  55     return true;
  56 }
  57
  58 void
  59 md5_block(const char* p, size_t len, string& md5)
  60 {
  61     unsigned char blk[16];
  62     MD5Context md5_ctx;
  63
  64     MD5Init(&md5_ctx);
  65     MD5Update(&md5_ctx, reinterpret_cast<const unsigned char*>(p), len);
  66     MD5Final(blk, &md5_ctx);
  67     md5.assign(reinterpret_cast<const char*>(blk), 16);
  68 }