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cfb128.c

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1/* $OpenBSD: cfb128.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 cfb 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_cfb128_encrypt(const unsigned char *in, unsigned char *out,-
67 size_t len, const void *key,-
68 unsigned char ivec[16], int *num,-
69 int enc, block128_f block)-
70{-
71 unsigned int n;-
72 size_t l = 0;-
73-
74 n = *num;-
75-
76 if (enc) {
encDescription
TRUEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
30
77#if !defined(OPENSSL_SMALL_FOOTPRINT)-
78 if (16%sizeof(size_t) == 0) do { /* always true actually */
16%sizeof(size_t) == 0Description
TRUEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-30
79 while (n && len) {
nDescription
TRUEnever evaluated
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
lenDescription
TRUEnever evaluated
FALSEnever evaluated
0-30
80 *(out++) = ivec[n] ^= *(in++);-
81 --len;-
82 n = (n+1) % 16;-
83 }
never executed: end of block
0
84#ifdef __STRICT_ALIGNMENT-
85 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)-
86 break;-
87#endif-
88 while (len>=16) {
len>=16Description
TRUEevaluated 354 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
30-354
89 (*block)(ivec, ivec, key);-
90 for (; n<16; n+=sizeof(size_t)) {
n<16Description
TRUEevaluated 708 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 354 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
354-708
91 *(size_t*)(out+n) =-
92 *(size_t*)(ivec+n) ^= *(size_t*)(in+n);-
93 }
executed 708 times by 2 tests: end of block
Executed by:
  • evptest
  • libcrypto.so.44.0.1
708
94 len -= 16;-
95 out += 16;-
96 in += 16;-
97 n = 0;-
98 }
executed 354 times by 2 tests: end of block
Executed by:
  • evptest
  • libcrypto.so.44.0.1
354
99 if (len) {
lenDescription
TRUEevaluated 6 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 24 times by 1 test
Evaluated by:
  • evptest
6-24
100 (*block)(ivec, ivec, key);-
101 while (len--) {
len--Description
TRUEevaluated 48 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 6 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
6-48
102 out[n] = ivec[n] ^= in[n];-
103 ++n;-
104 }
executed 48 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
48
105 }
executed 6 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
6
106 *num = n;-
107 return;
executed 30 times by 2 tests: return;
Executed by:
  • evptest
  • libcrypto.so.44.0.1
30
108 } while (0);
never executed: end of block
0
109 /* the rest would be commonly eliminated by x86* compiler */-
110#endif-
111 while (l<len) {
l<lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
112 if (n == 0) {
n == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
113 (*block)(ivec, ivec, key);-
114 }
never executed: end of block
0
115 out[l] = ivec[n] ^= in[l];-
116 ++l;-
117 n = (n+1) % 16;-
118 }
never executed: end of block
0
119 *num = n;-
120 } else {
never executed: end of block
0
121#if !defined(OPENSSL_SMALL_FOOTPRINT)-
122 if (16%sizeof(size_t) == 0) do { /* always true actually */
16%sizeof(size_t) == 0Description
TRUEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-30
123 while (n && len) {
nDescription
TRUEnever evaluated
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
lenDescription
TRUEnever evaluated
FALSEnever evaluated
0-30
124 unsigned char c;-
125 *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c;-
126 --len;-
127 n = (n+1) % 16;-
128 }
never executed: end of block
0
129#ifdef __STRICT_ALIGNMENT-
130 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)-
131 break;-
132#endif-
133 while (len>=16) {
len>=16Description
TRUEevaluated 354 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
30-354
134 (*block)(ivec, ivec, key);-
135 for (; n<16; n+=sizeof(size_t)) {
n<16Description
TRUEevaluated 708 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
FALSEevaluated 354 times by 2 tests
Evaluated by:
  • evptest
  • libcrypto.so.44.0.1
354-708
136 size_t t = *(size_t*)(in+n);-
137 *(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t;-
138 *(size_t*)(ivec+n) = t;-
139 }
executed 708 times by 2 tests: end of block
Executed by:
  • evptest
  • libcrypto.so.44.0.1
708
140 len -= 16;-
141 out += 16;-
142 in += 16;-
143 n = 0;-
144 }
executed 354 times by 2 tests: end of block
Executed by:
  • evptest
  • libcrypto.so.44.0.1
354
145 if (len) {
lenDescription
TRUEevaluated 6 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 24 times by 1 test
Evaluated by:
  • evptest
6-24
146 (*block)(ivec, ivec, key);-
147 while (len--) {
len--Description
TRUEevaluated 48 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 6 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
6-48
148 unsigned char c;-
149 out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c;-
150 ++n;-
151 }
executed 48 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
48
152 }
executed 6 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
6
153 *num = n;-
154 return;
executed 30 times by 2 tests: return;
Executed by:
  • evptest
  • libcrypto.so.44.0.1
30
155 } while (0);
never executed: end of block
0
156 /* the rest would be commonly eliminated by x86* compiler */-
157#endif-
158 while (l<len) {
l<lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
159 unsigned char c;-
160 if (n == 0) {
n == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
161 (*block)(ivec, ivec, key);-
162 }
never executed: end of block
0
163 out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;-
164 ++l;-
165 n = (n+1) % 16;-
166 }
never executed: end of block
0
167 *num=n;-
168 }
never executed: end of block
0
169}-
170-
171/* This expects a single block of size nbits for both in and out. Note that-
172 it corrupts any extra bits in the last byte of out */-
173static void cfbr_encrypt_block(const unsigned char *in,unsigned char *out,-
174 int nbits,const void *key,-
175 unsigned char ivec[16],int enc,-
176 block128_f block)-
177{-
178 int n,rem,num;-
179 unsigned char ovec[16*2 + 1]; /* +1 because we dererefence (but don't use) one byte off the end */-
180-
181 if (nbits<=0 || nbits>128) return;
never executed: return;
nbits<=0Description
TRUEnever evaluated
FALSEevaluated 95904 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
nbits>128Description
TRUEnever evaluated
FALSEevaluated 95904 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
0-95904
182-
183 /* fill in the first half of the new IV with the current IV */-
184 memcpy(ovec,ivec,16);-
185 /* construct the new IV */-
186 (*block)(ivec,ivec,key);-
187 num = (nbits+7)/8;-
188 if (enc) /* encrypt the input */
encDescription
TRUEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
47952
189 for(n=0 ; n < num ; ++n)
n < numDescription
TRUEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
47952
190 out[n] = (ovec[16+n] = in[n] ^ ivec[n]);
executed 47952 times by 1 test: out[n] = (ovec[16+n] = in[n] ^ ivec[n]);
Executed by:
  • libcrypto.so.44.0.1
47952
191 else /* decrypt the input */-
192 for(n=0 ; n < num ; ++n)
n < numDescription
TRUEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 47952 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
47952
193 out[n] = (ovec[16+n] = in[n]) ^ ivec[n];
executed 47952 times by 1 test: out[n] = (ovec[16+n] = in[n]) ^ ivec[n];
Executed by:
  • libcrypto.so.44.0.1
47952
194 /* shift ovec left... */-
195 rem = nbits%8;-
196 num = nbits/8;-
197 if(rem==0)
rem==0Description
TRUEevaluated 10656 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 85248 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
10656-85248
198 memcpy(ivec,ovec+num,16);
executed 10656 times by 1 test: memcpy(ivec,ovec+num,16);
Executed by:
  • libcrypto.so.44.0.1
10656
199 else-
200 for(n=0 ; n < 16 ; ++n)
n < 16Description
TRUEevaluated 1363968 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 85248 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
85248-1363968
201 ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
executed 1363968 times by 1 test: ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
Executed by:
  • libcrypto.so.44.0.1
1363968
202-
203 /* it is not necessary to cleanse ovec, since the IV is not secret */-
204}
executed 95904 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
95904
205-
206/* N.B. This expects the input to be packed, MS bit first */-
207void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out,-
208 size_t bits, const void *key,-
209 unsigned char ivec[16], int *num,-
210 int enc, block128_f block)-
211{-
212 size_t n;-
213 unsigned char c[1],d[1];-
214-
215 for(n=0 ; n<bits ; ++n)
n<bitsDescription
TRUEevaluated 85248 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 12 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
12-85248
216 {-
217 c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
(in[n/8]&(1 << (7-n%8)))Description
TRUEevaluated 38335 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 46913 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
38335-46913
218 cfbr_encrypt_block(c,d,1,key,ivec,enc,block);-
219 out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) |-
220 ((d[0]&0x80) >> (unsigned int)(n%8));-
221 }
executed 85248 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
85248
222}
executed 12 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
12
223-
224void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out,-
225 size_t length, const void *key,-
226 unsigned char ivec[16], int *num,-
227 int enc, block128_f block)-
228{-
229 size_t n;-
230-
231 for(n=0 ; n<length ; ++n)
n<lengthDescription
TRUEevaluated 10656 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
FALSEevaluated 12 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
12-10656
232 cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block);
executed 10656 times by 1 test: cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block);
Executed by:
  • libcrypto.so.44.0.1
10656
233}
executed 12 times by 1 test: end of block
Executed by:
  • libcrypto.so.44.0.1
12
234-
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