42 líneas
701 B
C
42 líneas
701 B
C
/*
|
|
This code was taken from the SPHINCS reference implementation and is public domain.
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
static int fd = -1;
|
|
|
|
void randombytes(unsigned char *x, unsigned long long xlen)
|
|
{
|
|
int i;
|
|
|
|
if (fd == -1) {
|
|
for (;;) {
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
if (fd != -1) {
|
|
break;
|
|
}
|
|
sleep(1);
|
|
}
|
|
}
|
|
|
|
while (xlen > 0) {
|
|
if (xlen < 1048576) {
|
|
i = xlen;
|
|
}
|
|
else {
|
|
i = 1048576;
|
|
}
|
|
|
|
i = read(fd, x, i);
|
|
if (i < 1) {
|
|
sleep(1);
|
|
continue;
|
|
}
|
|
|
|
x += i;
|
|
xlen -= i;
|
|
}
|
|
}
|