md5/md5_hash.c

   1 /*
   2 ** Copyright 2000 Double Precision, Inc.
   3 ** See COPYING for distribution information.
   4 */
   5
   6 #include        "md5.h"
   7 #include        <string.h>
   8
   9 static const char rcsid[]="$Id: md5_hash.c,v 1.5 2002/12/12 04:23:58 mrsam Exp $";
  10
  11 static const char base64tab[]=
  12 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  13
  14 const char *md5_hash_courier(const char *passw)
  15 {
  16 MD5_DIGEST md5buf;
  17 static char hash_buffer[1+(sizeof(md5buf)+2)/3*4];
  18 int     a=0,b=0,c=0;
  19 int     i, j;
  20 int     d, e, f, g;
  21
  22         md5_digest(passw, strlen(passw), md5buf);
  23
  24         j=0;
  25
  26         for (i=0; i<sizeof(md5buf); i += 3)
  27         {
  28                 a=md5buf[i];
  29                 b= i+1 < sizeof(md5buf) ? md5buf[i+1]:0;
  30                 c= i+2 < sizeof(md5buf) ? md5buf[i+2]:0;
  31
  32                 d=base64tab[ a >> 2 ];
  33                 e=base64tab[ ((a & 3 ) << 4) | (b >> 4)];
  34                 f=base64tab[ ((b & 15) << 2) | (c >> 6)];
  35                 g=base64tab[ c & 63 ];
  36                 if (i + 1 >= sizeof(md5buf))    f='=';
  37                 if (i + 2 >= sizeof(md5buf)) g='=';
  38                 hash_buffer[j++]=d;
  39                 hash_buffer[j++]=e;
  40                 hash_buffer[j++]=f;
  41                 hash_buffer[j++]=g;
  42         }
  43
  44         hash_buffer[j]=0;
  45         return (hash_buffer);
  46 }