sha1/sha1_hash.c

   1 /*
   2 ** Copyright 2001 Double Precision, Inc.
   3 ** See COPYING for distribution information.
   4 */
   5
   6 #include        "sha1.h"
   7 #include        <string.h>
   8
   9 static const char rcsid[]="$Id: sha1_hash.c,v 1.1 2001/04/19 01:20:46 mrsam Exp $";
  10
  11 static const char base64tab[]=
  12 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  13
  14 const char *sha1_hash(const char *passw)
  15 {
  16 SHA1_DIGEST sha1buf;
  17 static char hash_buffer[1+(sizeof(sha1buf)+2)/3*4];
  18 int     a=0,b=0,c=0;
  19 int     i, j;
  20 int     d, e, f, g;
  21
  22         sha1_digest(passw, strlen(passw), sha1buf);
  23
  24         j=0;
  25
  26         for (i=0; i<sizeof(sha1buf); i += 3)
  27         {
  28                 a=sha1buf[i];
  29                 b= i+1 < sizeof(sha1buf) ? sha1buf[i+1]:0;
  30                 c= i+2 < sizeof(sha1buf) ? sha1buf[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(sha1buf))   f='=';
  37                 if (i + 2 >= sizeof(sha1buf)) 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 }