int
main (int argc, char** argv) {
/*
uint8 data[1024];
unsigned len = 18;
for (int i=0;i<len;i++) {
printf("%i\n",(int)data[i]);
}
return(0);
}
*/
PX_MD *md;
uint8 rnd[16];
char data[1024];
int i;
strcpy(data,"This is a test");
if (px_get_random_bytes(rnd, 16) < 0) {
printf("No random bytes\n");
exit(1);
}
if (px_find_digest("sha1", &md) < 0) {
printf("No sha\n");
exit(1);
}
for (i=0;i<16;i++) {
printf("%i ",rnd[i]);
}
printf("\n");
/*
* Try to make the feeding unpredictable.
*
* Prefer data over keys, as it's rather likely that key is same in
* several calls.
*/
if (data && rnd[0] >= 32) {
add_block_entropy(md, data);
}
if (data && rnd[1] >= 160) {
add_block_entropy(md, data);
}
if (data && rnd[2] >= 160)
add_block_entropy(md, data);
px_md_free(md);
memset(rnd, 0, sizeof(rnd));
}
/*
* Mix user data into RNG. It is for user own interests to have
* RNG state shuffled.
*/
static void
add_entropy(text *data1, text *data2, text *data3)
{
PX_MD *md;
uint8 rnd[3];
if (!data1 && !data2 && !data3)
return;
if (px_get_random_bytes(rnd, 3) < 0)
return;
if (px_find_digest("sha1", &md) < 0)
return;
/*
* Try to make the feeding unpredictable.
*
* Prefer data over keys, as it's rather likely that key is same in
* several calls.
*/
/* chance: 7/8 */
if (data1 && rnd[0] >= 32)
add_block_entropy(md, data1);
/* chance: 5/8 */
if (data2 && rnd[1] >= 160)
add_block_entropy(md, data2);
/* chance: 5/8 */
if (data3 && rnd[2] >= 160)
add_block_entropy(md, data3);
px_md_free(md);
memset(rnd, 0, sizeof(rnd));
}
