diff options
Diffstat (limited to 'crypto/memneq.c')
| -rw-r--r-- | crypto/memneq.c | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/crypto/memneq.c b/crypto/memneq.c deleted file mode 100644 index cd01622..0000000 --- a/crypto/memneq.c +++ /dev/null @@ -1,138 +0,0 @@ -/* - * Constant-time equality testing of memory regions. - * - * Authors: - * - * James Yonan <james@openvpn.net> - * Daniel Borkmann <dborkman@redhat.com> - * - * This file is provided under a dual BSD/GPLv2 license. When using or - * redistributing this file, you may do so under either license. - * - * GPL LICENSE SUMMARY - * - * Copyright(c) 2013 OpenVPN Technologies, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * The full GNU General Public License is included in this distribution - * in the file called LICENSE.GPL. - * - * BSD LICENSE - * - * Copyright(c) 2013 OpenVPN Technologies, Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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. - * * Neither the name of OpenVPN Technologies nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "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 COPYRIGHT - * OWNER OR CONTRIBUTORS 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 <crypto/algapi.h> - -#ifndef __HAVE_ARCH_CRYPTO_MEMNEQ - -/* Generic path for arbitrary size */ -static inline unsigned long -__crypto_memneq_generic(const void *a, const void *b, size_t size) -{ - unsigned long neq = 0; - -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) - while (size >= sizeof(unsigned long)) { - neq |= *(unsigned long *)a ^ *(unsigned long *)b; - a += sizeof(unsigned long); - b += sizeof(unsigned long); - size -= sizeof(unsigned long); - } -#endif /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */ - while (size > 0) { - neq |= *(unsigned char *)a ^ *(unsigned char *)b; - a += 1; - b += 1; - size -= 1; - } - return neq; -} - -/* Loop-free fast-path for frequently used 16-byte size */ -static inline unsigned long __crypto_memneq_16(const void *a, const void *b) -{ -#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS - if (sizeof(unsigned long) == 8) - return ((*(unsigned long *)(a) ^ *(unsigned long *)(b)) - | (*(unsigned long *)(a+8) ^ *(unsigned long *)(b+8))); - else if (sizeof(unsigned int) == 4) - return ((*(unsigned int *)(a) ^ *(unsigned int *)(b)) - | (*(unsigned int *)(a+4) ^ *(unsigned int *)(b+4)) - | (*(unsigned int *)(a+8) ^ *(unsigned int *)(b+8)) - | (*(unsigned int *)(a+12) ^ *(unsigned int *)(b+12))); - else -#endif /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */ - return ((*(unsigned char *)(a) ^ *(unsigned char *)(b)) - | (*(unsigned char *)(a+1) ^ *(unsigned char *)(b+1)) - | (*(unsigned char *)(a+2) ^ *(unsigned char *)(b+2)) - | (*(unsigned char *)(a+3) ^ *(unsigned char *)(b+3)) - | (*(unsigned char *)(a+4) ^ *(unsigned char *)(b+4)) - | (*(unsigned char *)(a+5) ^ *(unsigned char *)(b+5)) - | (*(unsigned char *)(a+6) ^ *(unsigned char *)(b+6)) - | (*(unsigned char *)(a+7) ^ *(unsigned char *)(b+7)) - | (*(unsigned char *)(a+8) ^ *(unsigned char *)(b+8)) - | (*(unsigned char *)(a+9) ^ *(unsigned char *)(b+9)) - | (*(unsigned char *)(a+10) ^ *(unsigned char *)(b+10)) - | (*(unsigned char *)(a+11) ^ *(unsigned char *)(b+11)) - | (*(unsigned char *)(a+12) ^ *(unsigned char *)(b+12)) - | (*(unsigned char *)(a+13) ^ *(unsigned char *)(b+13)) - | (*(unsigned char *)(a+14) ^ *(unsigned char *)(b+14)) - | (*(unsigned char *)(a+15) ^ *(unsigned char *)(b+15))); -} - -/* Compare two areas of memory without leaking timing information, - * and with special optimizations for common sizes. Users should - * not call this function directly, but should instead use - * crypto_memneq defined in crypto/algapi.h. - */ -noinline unsigned long __crypto_memneq(const void *a, const void *b, - size_t size) -{ - switch (size) { - case 16: - return __crypto_memneq_16(a, b); - default: - return __crypto_memneq_generic(a, b, size); - } -} -EXPORT_SYMBOL(__crypto_memneq); - -#endif /* __HAVE_ARCH_CRYPTO_MEMNEQ */ |