OpenCoverage

cfb128.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/openssl/src/crypto/modes/cfb128.c
Source codeSwitch to Preprocessed file
LineSourceCount
1/*-
2 * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.-
3 *-
4 * Licensed under the OpenSSL license (the "License"). You may not use-
5 * this file except in compliance with the License. You can obtain a copy-
6 * in the file LICENSE in the source distribution or at-
7 * https://www.openssl.org/source/license.html-
8 */-
9-
10#include <openssl/crypto.h>-
11#include "modes_lcl.h"-
12#include <string.h>-
13-
14/*-
15 * The input and output encrypted as though 128bit cfb mode is being used.-
16 * The extra state information to record how much of the 128bit block we have-
17 * used is contained in *num;-
18 */-
19void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,-
20 size_t len, const void *key,-
21 unsigned char ivec[16], int *num,-
22 int enc, block128_f block)-
23{-
24 unsigned int n;-
25 size_t l = 0;-
26-
27 n = *num;-
28-
29 if (enc) {
encDescription
TRUEevaluated 10087 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 10027 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
10027-10087
30#if !defined(OPENSSL_SMALL_FOOTPRINT)-
31 if (16 % sizeof(size_t) == 0) { /* always true actually */
16 % sizeof(size_t) == 0Description
TRUEevaluated 10087 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEnever evaluated
0-10087
32 do {-
33 while (n && len) {
nDescription
TRUEevaluated 35028 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 9933 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
lenDescription
TRUEevaluated 34874 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 154 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
154-35028
34 *(out++) = ivec[n] ^= *(in++);-
35 --len;-
36 n = (n + 1) % 16;-
37 }
executed 34874 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
34874
38# if defined(STRICT_ALIGNMENT)-
39 if (((size_t)in | (size_t)out | (size_t)ivec) %-
40 sizeof(size_t) != 0)-
41 break;-
42# endif-
43 while (len >= 16) {
len >= 16Description
TRUEevaluated 195632 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 10087 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
10087-195632
44 (*block) (ivec, ivec, key);-
45 for (; n < 16; n += sizeof(size_t)) {
n < 16Description
TRUEevaluated 391264 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 195632 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
195632-391264
46 *(size_t *)(out + n) =-
47 *(size_t *)(ivec + n) ^= *(size_t *)(in + n);-
48 }
executed 391264 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
391264
49 len -= 16;-
50 out += 16;-
51 in += 16;-
52 n = 0;-
53 }
executed 195632 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
195632
54 if (len) {
lenDescription
TRUEevaluated 4223 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 5864 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
4223-5864
55 (*block) (ivec, ivec, key);-
56 while (len--) {
len--Description
TRUEevaluated 32596 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 4223 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
4223-32596
57 out[n] = ivec[n] ^= in[n];-
58 ++n;-
59 }
executed 32596 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
32596
60 }
executed 4223 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
4223
61 *num = n;-
62 return;
executed 10087 times by 1 test: return;
Executed by:
  • libcrypto.so.1.1
10087
63 } while (0);-
64 }
never executed: end of block
0
65 /* the rest would be commonly eliminated by x86* compiler */-
66#endif-
67 while (l < len) {
l < lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
68 if (n == 0) {
n == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
69 (*block) (ivec, ivec, key);-
70 }
never executed: end of block
0
71 out[l] = ivec[n] ^= in[l];-
72 ++l;-
73 n = (n + 1) % 16;-
74 }
never executed: end of block
0
75 *num = n;-
76 } else {
never executed: end of block
0
77#if !defined(OPENSSL_SMALL_FOOTPRINT)-
78 if (16 % sizeof(size_t) == 0) { /* always true actually */
16 % sizeof(size_t) == 0Description
TRUEevaluated 10027 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEnever evaluated
0-10027
79 do {-
80 while (n && len) {
nDescription
TRUEevaluated 34378 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 9883 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
lenDescription
TRUEevaluated 34234 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 144 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
144-34378
81 unsigned char c;-
82 *(out++) = ivec[n] ^ (c = *(in++));-
83 ivec[n] = c;-
84 --len;-
85 n = (n + 1) % 16;-
86 }
executed 34234 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
34234
87# if defined(STRICT_ALIGNMENT)-
88 if (((size_t)in | (size_t)out | (size_t)ivec) %-
89 sizeof(size_t) != 0)-
90 break;-
91# endif-
92 while (len >= 16) {
len >= 16Description
TRUEevaluated 195672 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 10027 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
10027-195672
93 (*block) (ivec, ivec, key);-
94 for (; n < 16; n += sizeof(size_t)) {
n < 16Description
TRUEevaluated 391344 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 195672 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
195672-391344
95 size_t t = *(size_t *)(in + n);-
96 *(size_t *)(out + n) = *(size_t *)(ivec + n) ^ t;-
97 *(size_t *)(ivec + n) = t;-
98 }
executed 391344 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
391344
99 len -= 16;-
100 out += 16;-
101 in += 16;-
102 n = 0;-
103 }
executed 195672 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
195672
104 if (len) {
lenDescription
TRUEevaluated 4183 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 5844 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
4183-5844
105 (*block) (ivec, ivec, key);-
106 while (len--) {
len--Description
TRUEevaluated 32596 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 4183 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
4183-32596
107 unsigned char c;-
108 out[n] = ivec[n] ^ (c = in[n]);-
109 ivec[n] = c;-
110 ++n;-
111 }
executed 32596 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
32596
112 }
executed 4183 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
4183
113 *num = n;-
114 return;
executed 10027 times by 1 test: return;
Executed by:
  • libcrypto.so.1.1
10027
115 } while (0);-
116 }
never executed: end of block
0
117 /* the rest would be commonly eliminated by x86* compiler */-
118#endif-
119 while (l < len) {
l < lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
120 unsigned char c;-
121 if (n == 0) {
n == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
122 (*block) (ivec, ivec, key);-
123 }
never executed: end of block
0
124 out[l] = ivec[n] ^ (c = in[l]);-
125 ivec[n] = c;-
126 ++l;-
127 n = (n + 1) % 16;-
128 }
never executed: end of block
0
129 *num = n;-
130 }
never executed: end of block
0
131}-
132-
133/*-
134 * This expects a single block of size nbits for both in and out. Note that-
135 * it corrupts any extra bits in the last byte of out-
136 */-
137static void cfbr_encrypt_block(const unsigned char *in, unsigned char *out,-
138 int nbits, const void *key,-
139 unsigned char ivec[16], int enc,-
140 block128_f block)-
141{-
142 int n, rem, num;-
143 unsigned char ovec[16 * 2 + 1]; /* +1 because we dereference (but don't-
144 * use) one byte off the end */-
145-
146 if (nbits <= 0 || nbits > 128)
nbits <= 0Description
TRUEnever evaluated
FALSEevaluated 562212 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
nbits > 128Description
TRUEnever evaluated
FALSEevaluated 562212 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
0-562212
147 return;
never executed: return;
0
148-
149 /* fill in the first half of the new IV with the current IV */-
150 memcpy(ovec, ivec, 16);-
151 /* construct the new IV */-
152 (*block) (ivec, ivec, key);-
153 num = (nbits + 7) / 8;-
154 if (enc) /* encrypt the input */
encDescription
TRUEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
281106
155 for (n = 0; n < num; ++n)
n < numDescription
TRUEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
281106
156 out[n] = (ovec[16 + n] = in[n] ^ ivec[n]);
executed 281106 times by 1 test: out[n] = (ovec[16 + n] = in[n] ^ ivec[n]);
Executed by:
  • libcrypto.so.1.1
281106
157 else /* decrypt the input */-
158 for (n = 0; n < num; ++n)
n < numDescription
TRUEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 281106 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
281106
159 out[n] = (ovec[16 + n] = in[n]) ^ ivec[n];
executed 281106 times by 1 test: out[n] = (ovec[16 + n] = in[n]) ^ ivec[n];
Executed by:
  • libcrypto.so.1.1
281106
160 /* shift ovec left... */-
161 rem = nbits % 8;-
162 num = nbits / 8;-
163 if (rem == 0)
rem == 0Description
TRUEevaluated 72708 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 489504 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
72708-489504
164 memcpy(ivec, ovec + num, 16);
executed 72708 times by 1 test: memcpy(ivec, ovec + num, 16);
Executed by:
  • libcrypto.so.1.1
72708
165 else-
166 for (n = 0; n < 16; ++n)
n < 16Description
TRUEevaluated 7832064 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 489504 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
489504-7832064
167 ivec[n] = ovec[n + num] << rem | ovec[n + num + 1] >> (8 - rem);
executed 7832064 times by 1 test: ivec[n] = ovec[n + num] << rem | ovec[n + num + 1] >> (8 - rem);
Executed by:
  • libcrypto.so.1.1
7832064
168-
169 /* it is not necessary to cleanse ovec, since the IV is not secret */-
170}
executed 562212 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
562212
171-
172/* N.B. This expects the input to be packed, MS bit first */-
173void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out,-
174 size_t bits, const void *key,-
175 unsigned char ivec[16], int *num,-
176 int enc, block128_f block)-
177{-
178 size_t n;-
179 unsigned char c[1], d[1];-
180-
181 for (n = 0; n < bits; ++n) {
n < bitsDescription
TRUEevaluated 489504 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 222 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
222-489504
182 c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
(in[n / 8] & (... (7 - n % 8)))Description
TRUEevaluated 224519 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 264985 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
224519-264985
183 cfbr_encrypt_block(c, d, 1, key, ivec, enc, block);-
184 out[n / 8] = (out[n / 8] & ~(1 << (unsigned int)(7 - n % 8))) |-
185 ((d[0] & 0x80) >> (unsigned int)(n % 8));-
186 }
executed 489504 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
489504
187}
executed 222 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
222
188-
189void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out,-
190 size_t length, const void *key,-
191 unsigned char ivec[16], int *num,-
192 int enc, block128_f block)-
193{-
194 size_t n;-
195-
196 for (n = 0; n < length; ++n)
n < lengthDescription
TRUEevaluated 72708 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
FALSEevaluated 366 times by 1 test
Evaluated by:
  • libcrypto.so.1.1
366-72708
197 cfbr_encrypt_block(&in[n], &out[n], 8, key, ivec, enc, block);
executed 72708 times by 1 test: cfbr_encrypt_block(&in[n], &out[n], 8, key, ivec, enc, block);
Executed by:
  • libcrypto.so.1.1
72708
198}
executed 366 times by 1 test: end of block
Executed by:
  • libcrypto.so.1.1
366
Source codeSwitch to Preprocessed file
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