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#include "config.h"
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "logerr.h"
#include "util.h"
#include "random.h"
struct Random {
FILE *const file_handle;
};
int
urandom_bytes(const size_t n, uint8_t (*const addr)[]) {
int rc = -1;
uint8_t *ret = NULL;
FILE *f = NULL;
ret = malloc(n);
if (ret == NULL) {
logerr("malloc(): %s", strerror(errno));
goto out;
}
f = fopen("/dev/urandom", "r");
if (f == NULL) {
logerr("fopen(): %s", strerror(errno));
goto out;
}
const size_t read_count = fread(ret, 1U, n, f);
if (ferror(f)) {
logerr("fread(): %s", strerror(errno));
goto out;
}
assert(read_count == n);
if (fclose(f)) {
logerr("fclose(): %s", strerror(errno));
goto out;
}
f = NULL;
memcpy(addr, ret, n);
rc = 0;
out:
if (f != NULL) {
if (fclose(f)) {
logerr("fclose(): %s", strerror(errno));
rc = -1;
}
}
if (ret != NULL) {
freeit((void *)&ret);
}
return rc;
}
int
random_generate(
const struct Random *const r,
const size_t length,
uint8_t (*const out)[]
) {
int rc = -1;
const size_t read_count = fread(out, 1U, length, r->file_handle);
if (ferror(r->file_handle)) {
logerr("fread(): %s", strerror(errno));
goto out;
}
assert(read_count == length);
rc = 0;
out:
return rc;
}
int
random_new(const struct Random **const out) {
int rc = -1;
const struct Random *ret = NULL;
FILE *f = NULL;
ret = malloc(sizeof(*ret));
if (ret == NULL) {
logerr("malloc(): %s", strerror(errno));
goto out;
}
f = fopen("/dev/urandom", "r");
if (f == NULL) {
logerr("fopen(): %s", strerror(errno));
goto out;
}
memcpy((void *)ret, &(struct Random) {
.file_handle = f,
}, sizeof(*ret));
*out = ret;
rc = 0;
out:
if (rc) {
random_free(&ret);
}
return rc;
}
int
random_free(const struct Random **const r) {
if (r == NULL) {
return 0;
}
if (*r == NULL) {
return 0;
}
int rc = -1;
if (fclose((*r)->file_handle)) {
logerr("fclose(): %s", strerror(errno));
goto out;
}
rc = 0;
out:
freeit((void *)r);
return rc;
}
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