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ofb128.c

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1/* $OpenBSD: ofb128.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */-
2/* ====================================================================-
3 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.-
4 *-
5 * Redistribution and use in source and binary forms, with or without-
6 * modification, are permitted provided that the following conditions-
7 * are met:-
8 *-
9 * 1. Redistributions of source code must retain the above copyright-
10 * notice, this list of conditions and the following disclaimer. -
11 *-
12 * 2. Redistributions in binary form must reproduce the above copyright-
13 * notice, this list of conditions and the following disclaimer in-
14 * the documentation and/or other materials provided with the-
15 * distribution.-
16 *-
17 * 3. All advertising materials mentioning features or use of this-
18 * software must display the following acknowledgment:-
19 * "This product includes software developed by the OpenSSL Project-
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"-
21 *-
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to-
23 * endorse or promote products derived from this software without-
24 * prior written permission. For written permission, please contact-
25 * openssl-core@openssl.org.-
26 *-
27 * 5. Products derived from this software may not be called "OpenSSL"-
28 * nor may "OpenSSL" appear in their names without prior written-
29 * permission of the OpenSSL Project.-
30 *-
31 * 6. Redistributions of any form whatsoever must retain the following-
32 * acknowledgment:-
33 * "This product includes software developed by the OpenSSL Project-
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"-
35 *-
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY-
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE-
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR-
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR-
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,-
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT-
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;-
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)-
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,-
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)-
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED-
47 * OF THE POSSIBILITY OF SUCH DAMAGE.-
48 * ====================================================================-
49 *-
50 */-
51-
52#include <openssl/crypto.h>-
53#include "modes_lcl.h"-
54#include <string.h>-
55-
56#ifndef MODES_DEBUG-
57# ifndef NDEBUG-
58# define NDEBUG-
59# endif-
60#endif-
61-
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;-
65 */-
66void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,-
67 size_t len, const void *key,-
68 unsigned char ivec[16], int *num,-
69 block128_f block)-
70{-
71 unsigned int n;-
72 size_t l=0;-
73-
74 n = *num;-
75-
76#if !defined(OPENSSL_SMALL_FOOTPRINT)-
77 if (16%sizeof(size_t) == 0) do { /* always true actually */
16%sizeof(size_t) == 0Description
TRUEevaluated 60 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-60
78 while (n && len) {
nDescription
TRUEnever evaluated
FALSEevaluated 60 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
lenDescription
TRUEnever evaluated
FALSEnever evaluated
0-60
79 *(out++) = *(in++) ^ ivec[n];-
80 --len;-
81 n = (n+1) % 16;-
82 }
never executed: end of block
0
83#ifdef __STRICT_ALIGNMENT-
84 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)-
85 break;-
86#endif-
87 while (len>=16) {
len>=16Description
TRUEevaluated 708 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 60 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
60-708
88 (*block)(ivec, ivec, key);-
89 for (; n<16; n+=sizeof(size_t))
n<16Description
TRUEevaluated 1416 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 708 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
708-1416
90 *(size_t*)(out+n) =
executed 1416 times by 2 tests: *(size_t*)(out+n) = *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
Executed by:
  • evptest
  • libcrypto.so.44.0.1
1416
91 *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
executed 1416 times by 2 tests: *(size_t*)(out+n) = *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
Executed by:
  • evptest
  • libcrypto.so.44.0.1
1416
92 len -= 16;-
93 out += 16;-
94 in += 16;-
95 n = 0;-
96 }
executed 708 times by 2 tests: end of block
Executed by:
  • evptest
  • libcrypto.so.44.0.1
708
97 if (len) {
lenDescription
TRUEevaluated 12 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 48 times by 1 test
Evaluated by:
  • evptest
12-48
98 (*block)(ivec, ivec, key);-
99 while (len--) {
len--Description
TRUEevaluated 96 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 12 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
12-96
100 out[n] = in[n] ^ ivec[n];-
101 ++n;-
102 }
executed 96 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
96
103 }
executed 12 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
12
104 *num = n;-
105 return;
executed 60 times by 2 tests: return;
Executed by:
  • evptest
  • libcrypto.so.44.0.1
60
106 } while(0);
never executed: end of block
0
107 /* the rest would be commonly eliminated by x86* compiler */-
108#endif-
109 while (l<len) {
l<lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
110 if (n==0) {
n==0Description
TRUEnever evaluated
FALSEnever evaluated
0
111 (*block)(ivec, ivec, key);-
112 }
never executed: end of block
0
113 out[l] = in[l] ^ ivec[n];-
114 ++l;-
115 n = (n+1) % 16;-
116 }
never executed: end of block
0
117-
118 *num=n;-
119}
never executed: end of block
0
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