servers/inet/generic/rand256.c

   1 /*
   2 rand256.c
   3
   4 Created:        Oct 2000 by Philip Homburg <philip@f-mnx.phicoh.com>
   5
   6 Generate 256-bit random numbers
   7 */
   8
   9 #ifdef __NBSD_LIBC
  10 #include <sys/sha2.h>
  11 #else
  12 #include <minix/sha2.h>
  13 #endif
  14 #include "inet.h"
  15 #include "rand256.h"
  16
  17 static u32_t base_bits[8];
  18
  19 void init_rand256(bits)
  20 u8_t bits[32];
  21 {
  22         memcpy(base_bits, bits, sizeof(base_bits));
  23 }
  24
  25 void rand256(bits)
  26 u8_t bits[32];
  27 {
  28         u32_t a;
  29         SHA256_CTX ctx;
  30
  31         a= ++base_bits[0];
  32         if (a == 0)
  33                 base_bits[1]++;
  34         SHA256_Init(&ctx);
  35         SHA256_Update(&ctx, (unsigned char *)base_bits, sizeof(base_bits));
  36         SHA256_Final(bits, &ctx);
  37 }
  38
  39 /*
  40  * $PchId: rand256.c,v 1.1 2005/06/28 14:13:43 philip Exp $
  41  */