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 #include <sha2.h>
  10 #include "inet.h"
  11 #include "rand256.h"
  12
  13 PRIVATE u32_t base_bits[8];
  14
  15 PUBLIC void init_rand256(bits)
  16 u8_t bits[32];
  17 {
  18         memcpy(base_bits, bits, sizeof(base_bits));
  19 }
  20
  21 PUBLIC void rand256(bits)
  22 u8_t bits[32];
  23 {
  24         u32_t a;
  25         SHA256_CTX ctx;
  26
  27         a= ++base_bits[0];
  28         if (a == 0)
  29                 base_bits[1]++;
  30         SHA256_Init(&ctx);
  31         SHA256_Update(&ctx, (unsigned char *)base_bits, sizeof(base_bits));
  32         SHA256_Final(bits, &ctx);
  33 }
  34
  35 /*
  36  * $PchId: rand256.c,v 1.1 2005/06/28 14:13:43 philip Exp $
  37  */