Update rand_bytes()

src/rand.c

@@ -1,46 +0,0 @@
-/*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
- *
- *  Licensed under the Apache License, Version 2.0 (the License); you may
- *  not use this file except in compliance with the License.
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- */
-
-
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <gmssl/rand.h>
-#include <gmssl/error.h>
-
-#define RAND_MAX_BUF_SIZE 4096
-
-int rand_bytes(uint8_t *buf, size_t len)
-{
-	FILE *fp;
-	if (!buf) {
-		error_print();
-		return -1;
-	}
-	if (len > RAND_MAX_BUF_SIZE) {
-		error_print();
-		return -1;
-	}
-	if (!len) {
-		return 0;
-	}
-
-	if (!(fp = fopen("/dev/urandom", "rb"))) {
-		error_print();
-		return -1;
-	}
-	if (fread(buf, 1, len, fp) != len) {
-		error_print();
-		fclose(fp);
-		return -1;
-	}
-	fclose(fp);
-	return 1;
-}