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85b2c0ce AP |
1 | /* ==================================================================== |
2 | * Copyright (c) 2008 The OpenSSL Project. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * | |
8 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 9 | * notice, this list of conditions and the following disclaimer. |
85b2c0ce AP |
10 | * |
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 | |
14 | * distribution. | |
15 | * | |
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/)" | |
20 | * | |
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. | |
25 | * | |
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. | |
29 | * | |
30 | * 6. Redistributions of any form whatsoever must retain the following | |
31 | * acknowledgment: | |
32 | * "This product includes software developed by the OpenSSL Project | |
33 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
34 | * | |
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 | * ==================================================================== | |
48 | * | |
49 | */ | |
50 | ||
d749e108 | 51 | #include <openssl/crypto.h> |
f472ec8c | 52 | #include "modes_lcl.h" |
85b2c0ce AP |
53 | #include <string.h> |
54 | ||
55 | #ifndef MODES_DEBUG | |
56 | # ifndef NDEBUG | |
57 | # define NDEBUG | |
58 | # endif | |
59 | #endif | |
60 | #include <assert.h> | |
61 | ||
0f113f3e MC |
62 | /* |
63 | * The input and output encrypted as though 128bit ofb mode is being used. | |
64 | * The extra state information to record how much of the 128bit block we have | |
65 | * used is contained in *num; | |
85b2c0ce AP |
66 | */ |
67 | void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out, | |
0f113f3e MC |
68 | size_t len, const void *key, |
69 | unsigned char ivec[16], int *num, block128_f block) | |
85b2c0ce | 70 | { |
0f113f3e MC |
71 | unsigned int n; |
72 | size_t l = 0; | |
85b2c0ce | 73 | |
0f113f3e | 74 | assert(in && out && key && ivec && num); |
85b2c0ce | 75 | |
0f113f3e | 76 | n = *num; |
85b2c0ce AP |
77 | |
78 | #if !defined(OPENSSL_SMALL_FOOTPRINT) | |
0f113f3e MC |
79 | if (16 % sizeof(size_t) == 0) { /* always true actually */ |
80 | do { | |
81 | while (n && len) { | |
82 | *(out++) = *(in++) ^ ivec[n]; | |
83 | --len; | |
84 | n = (n + 1) % 16; | |
85 | } | |
86 | # if defined(STRICT_ALIGNMENT) | |
87 | if (((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != | |
88 | 0) | |
89 | break; | |
90 | # endif | |
91 | while (len >= 16) { | |
92 | (*block) (ivec, ivec, key); | |
93 | for (; n < 16; n += sizeof(size_t)) | |
94 | *(size_t *)(out + n) = | |
95 | *(size_t *)(in + n) ^ *(size_t *)(ivec + n); | |
96 | len -= 16; | |
97 | out += 16; | |
98 | in += 16; | |
99 | n = 0; | |
100 | } | |
101 | if (len) { | |
102 | (*block) (ivec, ivec, key); | |
103 | while (len--) { | |
104 | out[n] = in[n] ^ ivec[n]; | |
105 | ++n; | |
106 | } | |
107 | } | |
108 | *num = n; | |
109 | return; | |
110 | } while (0); | |
111 | } | |
112 | /* the rest would be commonly eliminated by x86* compiler */ | |
85b2c0ce | 113 | #endif |
0f113f3e MC |
114 | while (l < len) { |
115 | if (n == 0) { | |
116 | (*block) (ivec, ivec, key); | |
117 | } | |
118 | out[l] = in[l] ^ ivec[n]; | |
119 | ++l; | |
120 | n = (n + 1) % 16; | |
121 | } | |
85b2c0ce | 122 | |
0f113f3e | 123 | *num = n; |
85b2c0ce | 124 | } |