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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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zip_random_unix.c -- fill the user's buffer with random stuff (Unix version)
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Copyright (C) 2016-2019 Dieter Baron and Thomas Klausner
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This file is part of libzip, a library to manipulate ZIP archives.
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The authors can be contacted at <libzip@nih.at>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The names of the authors may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "zipint.h"
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#ifdef HAVE_CRYPTO
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#include "zip_crypto.h"
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#endif
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#ifdef HAVE_ARC4RANDOM
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#include <stdlib.h>
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#ifndef HAVE_SECURE_RANDOM
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ZIP_EXTERN bool
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zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
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arc4random_buf(buffer, length);
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return true;
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}
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#endif
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#ifndef HAVE_RANDOM_UINT32
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zip_uint32_t
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zip_random_uint32(void) {
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return arc4random();
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}
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#endif
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#else /* HAVE_ARC4RANDOM */
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#ifndef HAVE_SECURE_RANDOM
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#include <fcntl.h>
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#include <unistd.h>
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ZIP_EXTERN bool
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zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
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int fd;
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if ((fd = open("/dev/urandom", O_RDONLY)) < 0) {
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return false;
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}
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if (read(fd, buffer, length) != length) {
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close(fd);
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return false;
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}
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close(fd);
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return true;
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}
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#endif
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#ifndef HAVE_RANDOM_UINT32
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#include <stdlib.h>
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zip_uint32_t
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zip_random_uint32(void) {
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static bool seeded = false;
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zip_uint32_t value;
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if (zip_secure_random((zip_uint8_t *)&value, sizeof(value))) {
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return value;
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}
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if (!seeded) {
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srandom((unsigned int)time(NULL));
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}
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return (zip_uint32_t)random();
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}
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#endif
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#endif /* HAVE_ARC4RANDOM */
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