File: | src/lib/libcrypto/des/cfb64enc.c |
Warning: | line 120, column 32 Although the value stored to 'cc' is used in the enclosing expression, the value is never actually read from 'cc' |
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1 | /* $OpenBSD: cfb64enc.c,v 1.8 2023/07/08 07:11:07 beck Exp $ */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
3 | * All rights reserved. |
4 | * |
5 | * This package is an SSL implementation written |
6 | * by Eric Young (eay@cryptsoft.com). |
7 | * The implementation was written so as to conform with Netscapes SSL. |
8 | * |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions |
11 | * apply to all code found in this distribution, be it the RC4, RSA, |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
13 | * included with this distribution is covered by the same copyright terms |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
15 | * |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. |
18 | * If this package is used in a product, Eric Young should be given attribution |
19 | * as the author of the parts of the library used. |
20 | * This can be in the form of a textual message at program startup or |
21 | * in documentation (online or textual) provided with the package. |
22 | * |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions |
25 | * are met: |
26 | * 1. Redistributions of source code must retain the copyright |
27 | * notice, this list of conditions and the following disclaimer. |
28 | * 2. Redistributions in binary form must reproduce the above copyright |
29 | * notice, this list of conditions and the following disclaimer in the |
30 | * documentation and/or other materials provided with the distribution. |
31 | * 3. All advertising materials mentioning features or use of this software |
32 | * must display the following acknowledgement: |
33 | * "This product includes cryptographic software written by |
34 | * Eric Young (eay@cryptsoft.com)" |
35 | * The word 'cryptographic' can be left out if the rouines from the library |
36 | * being used are not cryptographic related :-). |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
40 | * |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
51 | * SUCH DAMAGE. |
52 | * |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
55 | * copied and put under another distribution licence |
56 | * [including the GNU Public Licence.] |
57 | */ |
58 | |
59 | #include "des_local.h" |
60 | |
61 | /* The input and output encrypted as though 64bit cfb mode is being |
62 | * used. The extra state information to record how much of the |
63 | * 64bit block we have used is contained in *num; |
64 | */ |
65 | |
66 | void |
67 | DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
68 | long length, DES_key_schedule *schedule, |
69 | DES_cblock *ivec, int *num, int enc) |
70 | { |
71 | DES_LONGunsigned int v0, v1; |
72 | long l = length; |
73 | int n = *num; |
74 | DES_LONGunsigned int ti[2]; |
75 | unsigned char *iv, c, cc; |
76 | |
77 | iv = &(*ivec)[0]; |
78 | if (enc) { |
79 | while (l--) { |
80 | if (n == 0) { |
81 | c2l(iv, v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
82 | ti[0] = v0; |
83 | c2l(iv, v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
84 | ti[1] = v1; |
85 | DES_encrypt1(ti, schedule, DES_ENCRYPT1); |
86 | iv = &(*ivec)[0]; |
87 | v0 = ti[0]; |
88 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
89 | v0 = ti[1]; |
90 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
91 | iv = &(*ivec)[0]; |
92 | } |
93 | c = *(in++) ^ iv[n]; |
94 | *(out++) = c; |
95 | iv[n] = c; |
96 | n = (n + 1) & 0x07; |
97 | } |
98 | } else { |
99 | while (l--) { |
100 | if (n == 0) { |
101 | c2l(iv, v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
102 | ti[0] = v0; |
103 | c2l(iv, v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
104 | ti[1] = v1; |
105 | DES_encrypt1(ti, schedule, DES_ENCRYPT1); |
106 | iv = &(*ivec)[0]; |
107 | v0 = ti[0]; |
108 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
109 | v0 = ti[1]; |
110 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
111 | iv = &(*ivec)[0]; |
112 | } |
113 | cc = *(in++); |
114 | c = iv[n]; |
115 | iv[n] = cc; |
116 | *(out++) = c ^ cc; |
117 | n = (n + 1) & 0x07; |
118 | } |
119 | } |
120 | v0 = v1 = ti[0] = ti[1] = c = cc = 0; |
Although the value stored to 'cc' is used in the enclosing expression, the value is never actually read from 'cc' | |
121 | *num = n; |
122 | } |