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#include <s.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "logerr.h"
#include "random.h"
static FILE *
FRANDOM = NULL;
int
random_init(void) {
int rc = -1;
FRANDOM = fopen("/dev/urandom", "r");
if (FRANDOM == NULL) {
logerr("fopen(): %s", strerror(errno));
goto out;
}
rc = 0;
out:
return rc;
}
int
random_end(void) {
int rc = -1;
if (fclose(FRANDOM)) {
logerr("fclose(): %s", strerror(errno));
goto out;
}
rc = 0;
out:
FRANDOM = NULL;
return rc;
}
int
random_bytes(const size_t length, u8 (*const out)[]) {
int rc = -1;
assert(FRANDOM != NULL);
const size_t read_count = fread(out, 1U, length, FRANDOM);
if (ferror(FRANDOM)) {
logerr("fread(): %s", strerror(errno));
goto out;
}
assert(read_count == length);
rc = 0;
out:
return rc;
}
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