| Index: openssl/crypto/modes/ofb128.c
|
| ===================================================================
|
| --- openssl/crypto/modes/ofb128.c (revision 0)
|
| +++ openssl/crypto/modes/ofb128.c (revision 0)
|
| @@ -0,0 +1,128 @@
|
| +/* ====================================================================
|
| + * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
|
| + *
|
| + * 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. All advertising materials mentioning features or use of this
|
| + * software must display the following acknowledgment:
|
| + * "This product includes software developed by the OpenSSL Project
|
| + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
|
| + *
|
| + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
| + * endorse or promote products derived from this software without
|
| + * prior written permission. For written permission, please contact
|
| + * openssl-core@openssl.org.
|
| + *
|
| + * 5. Products derived from this software may not be called "OpenSSL"
|
| + * nor may "OpenSSL" appear in their names without prior written
|
| + * permission of the OpenSSL Project.
|
| + *
|
| + * 6. Redistributions of any form whatsoever must retain the following
|
| + * acknowledgment:
|
| + * "This product includes software developed by the OpenSSL Project
|
| + * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
|
| + *
|
| + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
| + * EXPRESSED 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 OpenSSL PROJECT OR
|
| + * ITS 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 "modes.h"
|
| +#include <string.h>
|
| +
|
| +#ifndef MODES_DEBUG
|
| +# ifndef NDEBUG
|
| +# define NDEBUG
|
| +# endif
|
| +#endif
|
| +#include <assert.h>
|
| +
|
| +#define STRICT_ALIGNMENT
|
| +#if defined(__i386) || defined(__i386__) || \
|
| + defined(__x86_64) || defined(__x86_64__) || \
|
| + defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
|
| + defined(__s390__) || defined(__s390x__)
|
| +# undef STRICT_ALIGNMENT
|
| +#endif
|
| +
|
| +/* The input and output encrypted as though 128bit ofb mode is being
|
| + * used. The extra state information to record how much of the
|
| + * 128bit block we have used is contained in *num;
|
| + */
|
| +void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
|
| + size_t len, const void *key,
|
| + unsigned char ivec[16], int *num,
|
| + block128_f block)
|
| +{
|
| + unsigned int n;
|
| + size_t l=0;
|
| +
|
| + assert(in && out && key && ivec && num);
|
| +
|
| + n = *num;
|
| +
|
| +#if !defined(OPENSSL_SMALL_FOOTPRINT)
|
| + if (16%sizeof(size_t) == 0) do { /* always true actually */
|
| + while (n && len) {
|
| + *(out++) = *(in++) ^ ivec[n];
|
| + --len;
|
| + n = (n+1) % 16;
|
| + }
|
| +#if defined(STRICT_ALIGNMENT)
|
| + if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
|
| + break;
|
| +#endif
|
| + while (len>=16) {
|
| + (*block)(ivec, ivec, key);
|
| + for (; n<16; n+=sizeof(size_t))
|
| + *(size_t*)(out+n) =
|
| + *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
|
| + len -= 16;
|
| + out += 16;
|
| + in += 16;
|
| + n = 0;
|
| + }
|
| + if (len) {
|
| + (*block)(ivec, ivec, key);
|
| + while (len--) {
|
| + out[n] = in[n] ^ ivec[n];
|
| + ++n;
|
| + }
|
| + }
|
| + *num = n;
|
| + return;
|
| + } while(0);
|
| + /* the rest would be commonly eliminated by x86* compiler */
|
| +#endif
|
| + while (l<len) {
|
| + if (n==0) {
|
| + (*block)(ivec, ivec, key);
|
| + }
|
| + out[l] = in[l] ^ ivec[n];
|
| + ++l;
|
| + n = (n+1) % 16;
|
| + }
|
| +
|
| + *num=n;
|
| +}
|
|
|