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 * ====================================================================
51 #include <openssl/crypto.h>
52 #include "modes_lcl.h"
62 /* The input and output encrypted as though 128bit ofb mode is being
63 * used. The extra state information to record how much of the
64 * 128bit block we have used is contained in *num;
66 void CRYPTO_ofb128_encrypt(const unsigned char *in
, unsigned char *out
,
67 size_t len
, const void *key
,
68 unsigned char ivec
[16], int *num
,
74 assert(in
&& out
&& key
&& ivec
&& num
);
78 #if !defined(OPENSSL_SMALL_FOOTPRINT)
79 if (16%sizeof(size_t) == 0) do { /* always true actually */
81 *(out
++) = *(in
++) ^ ivec
[n
];
85 #if defined(STRICT_ALIGNMENT)
86 if (((size_t)in
|(size_t)out
|(size_t)ivec
)%sizeof(size_t) != 0)
90 (*block
)(ivec
, ivec
, key
);
91 for (; n
<16; n
+=sizeof(size_t))
93 *(size_t*)(in
+n
) ^ *(size_t*)(ivec
+n
);
100 (*block
)(ivec
, ivec
, key
);
102 out
[n
] = in
[n
] ^ ivec
[n
];
109 /* the rest would be commonly eliminated by x86* compiler */
113 (*block
)(ivec
, ivec
, key
);
115 out
[l
] = in
[l
] ^ ivec
[n
];