minix/servers/inet/generic/rand256.c

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/*
rand256.c
Created: Oct 2000 by Philip Homburg <philip@f-mnx.phicoh.com>
Generate 256-bit random numbers
*/
2010-11-15 12:10:02 +01:00
#include <minix/sha2.h>
#include "inet.h"
#include "rand256.h"
PRIVATE u32_t base_bits[8];
PUBLIC void init_rand256(bits)
u8_t bits[32];
{
memcpy(base_bits, bits, sizeof(base_bits));
}
PUBLIC void rand256(bits)
u8_t bits[32];
{
u32_t a;
SHA256_CTX ctx;
a= ++base_bits[0];
if (a == 0)
base_bits[1]++;
SHA256_Init(&ctx);
SHA256_Update(&ctx, (unsigned char *)base_bits, sizeof(base_bits));
SHA256_Final(bits, &ctx);
}
/*
* $PchId: rand256.c,v 1.1 2005/06/28 14:13:43 philip Exp $
*/