chanserv/chanservcrypto.c

   1 #include <stdio.h>
   2
   3 #include "chanserv.h"
   4 #include "../core/error.h"
   5 #include "../lib/prng.h"
   6
   7 prngctx rng;
   8
   9 void chanservcryptoinit(void) {
  10   int ret;
  11
  12   FILE *e = fopen(ENTROPYSOURCE, "rb");
  13   if(!e) {
  14     Error("chanserv",ERR_STOP,"Unable to open entropy source.");
  15     /* shouldn't be running now... */
  16   }
  17
  18   ret = fread(rng.randrsl, 1, sizeof(rng.randrsl), e);
  19   fclose(e);
  20
  21   if(ret != sizeof(rng.randrsl)) {
  22     Error("chanserv",ERR_STOP,"Unable to read entropy.");
  23     /* shouldn't be running now... */
  24   }
  25
  26   prnginit(&rng, 1);
  27 }
  28
  29 ub4 cs_getrandint(void) {
  30   return prng(&rng);
  31 }
  32
  33 void cs_getrandbytes(unsigned char *buf, size_t bytes) {
  34   ub4 b;
  35
  36   for(;bytes>0;bytes-=4,buf+=4) {
  37     ub4 b = cs_getrandint();
  38     memcpy(buf, &b, 4);
  39   }
  40 }