270 lines
6.5 KiB
C
270 lines
6.5 KiB
C
/*-
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* Copyright (c) 2014 Michihiro NAKAJIMA
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* All rights reserved.
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*
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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 the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#if !defined(HAVE_ARC4RANDOM_BUF) && (!defined(_WIN32) || defined(__CYGWIN__))
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#ifdef HAVE_FCNTL
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#include <fcntl.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_PTHREAD_H
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#include <pthread.h>
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#endif
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static void arc4random_buf(void *, size_t);
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#endif /* HAVE_ARC4RANDOM_BUF */
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#include "archive.h"
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#include "archive_random_private.h"
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#if defined(HAVE_WINCRYPT_H) && !defined(__CYGWIN__)
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#include <wincrypt.h>
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#endif
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 0
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#endif
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/*
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* Random number generator function.
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* This simply calls arc4random_buf function if the platform provides it.
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*/
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int
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archive_random(void *buf, size_t nbytes)
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{
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#if defined(_WIN32) && !defined(__CYGWIN__)
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HCRYPTPROV hProv;
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BOOL success;
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success = CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT);
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if (!success && GetLastError() == NTE_BAD_KEYSET) {
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success = CryptAcquireContext(&hProv, NULL, NULL,
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PROV_RSA_FULL, CRYPT_NEWKEYSET);
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}
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if (success) {
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success = CryptGenRandom(hProv, (DWORD)nbytes, (BYTE*)buf);
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CryptReleaseContext(hProv, 0);
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if (success)
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return ARCHIVE_OK;
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}
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/* TODO: Does this case really happen? */
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return ARCHIVE_FAILED;
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#else
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arc4random_buf(buf, nbytes);
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return ARCHIVE_OK;
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#endif
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}
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#if !defined(HAVE_ARC4RANDOM_BUF) && (!defined(_WIN32) || defined(__CYGWIN__))
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/* $OpenBSD: arc4random.c,v 1.24 2013/06/11 16:59:50 deraadt Exp $ */
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/*
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* Copyright (c) 1996, David Mazieres <dm@uun.org>
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Arc4 random number generator for OpenBSD.
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*
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* This code is derived from section 17.1 of Applied Cryptography,
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* second edition, which describes a stream cipher allegedly
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* compatible with RSA Labs "RC4" cipher (the actual description of
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* which is a trade secret). The same algorithm is used as a stream
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* cipher called "arcfour" in Tatu Ylonen's ssh package.
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*
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* RC4 is a registered trademark of RSA Laboratories.
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*/
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#ifdef __GNUC__
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#define inline __inline
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#else /* !__GNUC__ */
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#define inline
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#endif /* !__GNUC__ */
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struct arc4_stream {
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uint8_t i;
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uint8_t j;
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uint8_t s[256];
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};
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#define RANDOMDEV "/dev/urandom"
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#define KEYSIZE 128
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#ifdef HAVE_PTHREAD_H
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static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
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#define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx);
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#define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx);
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#else
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#define _ARC4_LOCK()
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#define _ARC4_UNLOCK()
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#endif
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static int rs_initialized;
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static struct arc4_stream rs;
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static pid_t arc4_stir_pid;
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static int arc4_count;
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static inline uint8_t arc4_getbyte(void);
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static void arc4_stir(void);
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static inline void
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arc4_init(void)
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{
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int n;
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for (n = 0; n < 256; n++)
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rs.s[n] = n;
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rs.i = 0;
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rs.j = 0;
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}
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static inline void
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arc4_addrandom(u_char *dat, int datlen)
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{
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int n;
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uint8_t si;
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rs.i--;
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for (n = 0; n < 256; n++) {
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rs.i = (rs.i + 1);
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si = rs.s[rs.i];
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rs.j = (rs.j + si + dat[n % datlen]);
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rs.s[rs.i] = rs.s[rs.j];
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rs.s[rs.j] = si;
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}
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rs.j = rs.i;
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}
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static void
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arc4_stir(void)
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{
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int done, fd, i;
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struct {
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struct timeval tv;
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pid_t pid;
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u_char rnd[KEYSIZE];
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} rdat;
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if (!rs_initialized) {
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arc4_init();
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rs_initialized = 1;
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}
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done = 0;
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fd = open(RANDOMDEV, O_RDONLY | O_CLOEXEC, 0);
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if (fd >= 0) {
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if (read(fd, &rdat, KEYSIZE) == KEYSIZE)
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done = 1;
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(void)close(fd);
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}
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if (!done) {
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(void)gettimeofday(&rdat.tv, NULL);
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rdat.pid = getpid();
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/* We'll just take whatever was on the stack too... */
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}
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arc4_addrandom((u_char *)&rdat, KEYSIZE);
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/*
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* Discard early keystream, as per recommendations in:
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* "(Not So) Random Shuffles of RC4" by Ilya Mironov.
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*/
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for (i = 0; i < 1024; i++)
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(void)arc4_getbyte();
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arc4_count = 1600000;
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}
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static void
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arc4_stir_if_needed(void)
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{
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pid_t pid = getpid();
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if (arc4_count <= 0 || !rs_initialized || arc4_stir_pid != pid) {
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arc4_stir_pid = pid;
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arc4_stir();
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}
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}
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static inline uint8_t
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arc4_getbyte(void)
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{
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uint8_t si, sj;
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rs.i = (rs.i + 1);
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si = rs.s[rs.i];
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rs.j = (rs.j + si);
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sj = rs.s[rs.j];
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rs.s[rs.i] = sj;
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rs.s[rs.j] = si;
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return (rs.s[(si + sj) & 0xff]);
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}
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static void
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arc4random_buf(void *_buf, size_t n)
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{
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u_char *buf = (u_char *)_buf;
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_ARC4_LOCK();
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arc4_stir_if_needed();
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while (n--) {
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if (--arc4_count <= 0)
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arc4_stir();
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buf[n] = arc4_getbyte();
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}
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_ARC4_UNLOCK();
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}
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#endif /* !HAVE_ARC4RANDOM_BUF */
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