libs/sha1/sha256_hash.c

   1 /*
   2 ** Copyright 2005 Double Precision, Inc.
   3 ** See COPYING for distribution information.
   4 */
   5
   6 #include        "sha1.h"
   7 #include        <string.h>
   8
   9
  10 static const char base64tab[]=
  11 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  12
  13 const char *sha256_hash(const char *passw)
  14 {
  15 SHA256_DIGEST sha256buf;
  16 static char hash_buffer[1+(sizeof(sha256buf)+2)/3*4];
  17 int     a=0,b=0,c=0;
  18 int     i, j;
  19 int     d, e, f, g;
  20
  21         sha256_digest(passw, strlen(passw), sha256buf);
  22
  23         j=0;
  24
  25         for (i=0; i<sizeof(sha256buf); i += 3)
  26         {
  27                 a=sha256buf[i];
  28                 b= i+1 < sizeof(sha256buf) ? sha256buf[i+1]:0;
  29                 c= i+2 < sizeof(sha256buf) ? sha256buf[i+2]:0;
  30
  31                 d=base64tab[ a >> 2 ];
  32                 e=base64tab[ ((a & 3 ) << 4) | (b >> 4)];
  33                 f=base64tab[ ((b & 15) << 2) | (c >> 6)];
  34                 g=base64tab[ c & 63 ];
  35                 if (i + 1 >= sizeof(sha256buf)) f='=';
  36                 if (i + 2 >= sizeof(sha256buf)) g='=';
  37                 hash_buffer[j++]=d;
  38                 hash_buffer[j++]=e;
  39                 hash_buffer[j++]=f;
  40                 hash_buffer[j++]=g;
  41         }
  42
  43         hash_buffer[j]=0;
  44         return (hash_buffer);
  45 }