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/*
zip_random_unix.c -- fill the user's buffer with random stuff (Unix version)
Copyright (C) 2016-2021 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <info@libzip.org>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "zipint.h"
#ifdef HAVE_CRYPTO
#include "zip_crypto.h"
#endif
#ifdef HAVE_ARC4RANDOM
#include <stdlib.h>
#ifndef HAVE_SECURE_RANDOM
ZIP_EXTERN bool
zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
arc4random_buf(buffer, length);
return true;
}
#endif
#ifndef HAVE_RANDOM_UINT32
zip_uint32_t
zip_random_uint32(void) {
return arc4random();
}
#endif
#else /* HAVE_ARC4RANDOM */
#ifndef HAVE_SECURE_RANDOM
#include <fcntl.h>
#include <unistd.h>
ZIP_EXTERN bool
zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
int fd;
if ((fd = open("/dev/urandom", O_RDONLY)) < 0) {
return false;
}
if (read(fd, buffer, length) != length) {
close(fd);
return false;
}
close(fd);
return true;
}
#endif
#ifndef HAVE_RANDOM_UINT32
#include <stdlib.h>
#ifndef HAVE_RANDOM
#define srandom srand
#define random rand
#endif
zip_uint32_t
zip_random_uint32(void) {
static bool seeded = false;
zip_uint32_t value;
if (zip_secure_random((zip_uint8_t *)&value, sizeof(value))) {
return value;
}
if (!seeded) {
srandom((unsigned int)time(NULL));
seeded = true;
}
return (zip_uint32_t)random();
}
#endif
#endif /* HAVE_ARC4RANDOM */
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