mdw@git.distorted.org.uk Git - ezmlm/blob - surfpcs.c

   1 /* XXX: this needs testing */
   2
   3 #include "surf.h"
   4 #include "surfpcs.h"
   5
   6 void surfpcs_init(s,k)
   7 surfpcs *s;
   8 uint32 k[32];
   9 {
  10   int i;
  11   for (i = 0;i < 32;++i) s->seed[i] = k[i];
  12   for (i = 0;i < 8;++i) s->sum[i] = 0;
  13   for (i = 0;i < 12;++i) s->in[i] = 0;
  14   s->todo = 0;
  15 }
  16
  17 static uint32 littleendian[8] = {
  18   50462976, 117835012, 185207048, 252579084,
  19   319951120, 387323156, 454695192, 522067228
  20 } ;
  21 #define end ((unsigned char *) &littleendian)
  22
  23 #define data ((unsigned char *) s->in)
  24 #define outdata ((unsigned char *) s->out)
  25
  26 void surfpcs_add(s,x,n)
  27 surfpcs *s;
  28 unsigned char *x;
  29 unsigned int n;
  30 {
  31   int i;
  32   while (n--) {
  33     data[end[s->todo++]] = *x++;
  34     if (s->todo == 32) {
  35       s->todo = 0;
  36       if (!++s->in[8])
  37         if (!++s->in[9])
  38           if (!++s->in[10])
  39             ++s->in[11];
  40       surf(s->out,s->in,s->seed);
  41       for (i = 0;i < 8;++i)
  42         s->sum[i] += s->out[i];
  43     }
  44   }
  45 }
  46
  47 void surfpcs_out(s,h)
  48 surfpcs *s;
  49 unsigned char h[32];
  50 {
  51   int i;
  52   surfpcs_add(s,".",1);
  53   while (s->todo) surfpcs_add(s,"",1);
  54   for (i = 0;i < 8;++i) s->in[i] = s->sum[i];
  55   for (;i < 12;++i) s->in[i] = 0;
  56   surf(s->out,s->in,s->seed);
  57   for (i = 0;i < 32;++i) h[i] = outdata[end[i]];
  58 }