1 /* ====================================================================
2 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@openssl.org.
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
61 #define STRICT_ALIGNMENT
62 #if defined(__i386) || defined(__i386__) || \
63 defined(__x86_64) || defined(__x86_64__) || \
64 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
65 defined(__s390__) || defined(__s390x__)
66 # undef STRICT_ALIGNMENT
69 /* The input and output encrypted as though 128bit ofb mode is being
70 * used. The extra state information to record how much of the
71 * 128bit block we have used is contained in *num;
73 void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
74 size_t len, const void *key,
75 unsigned char ivec[16], int *num,
81 assert(in && out && key && ivec && num);
85 #if !defined(OPENSSL_SMALL_FOOTPRINT)
86 if (16%sizeof(size_t) == 0) do { /* always true actually */
88 *(out++) = *(in++) ^ ivec[n];
92 #if defined(STRICT_ALIGNMENT)
93 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
97 (*block)(ivec, ivec, key);
98 for (; n<16; n+=sizeof(size_t))
100 *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
107 (*block)(ivec, ivec, key);
109 out[n] = in[n] ^ ivec[n];
116 /* the rest would be commonly eliminated by x86* compiler */
120 (*block)(ivec, ivec, key);
122 out[l] = in[l] ^ ivec[n];