File: | src/lib/libcrypto/des/cfb_enc.c |
Warning: | line 187, column 2 Value stored to 'v0' is never read |
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1 | /* $OpenBSD: cfb_enc.c,v 1.14 2021/11/09 18:40:21 bcook 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_locl.h" |
60 | #include <endian.h> |
61 | |
62 | /* The input and output are loaded in multiples of 8 bits. |
63 | * What this means is that if you hame numbits=12 and length=2 |
64 | * the first 12 bits will be retrieved from the first byte and half |
65 | * the second. The second 12 bits will come from the 3rd and half the 4th |
66 | * byte. |
67 | */ |
68 | /* Until Aug 1 2003 this function did not correctly implement CFB-r, so it |
69 | * will not be compatible with any encryption prior to that date. Ben. */ |
70 | void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, |
71 | long length, DES_key_schedule *schedule, DES_cblock *ivec, |
72 | int enc) |
73 | { |
74 | DES_LONGunsigned int d0,d1,v0,v1; |
75 | unsigned long l=length; |
76 | int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8; |
77 | DES_LONGunsigned int ti[2]; |
78 | unsigned char *iv; |
79 | #if BYTE_ORDER1234 != LITTLE_ENDIAN1234 |
80 | unsigned char ovec[16]; |
81 | #else |
82 | unsigned int sh[4]; |
83 | unsigned char *ovec=(unsigned char *)sh; |
84 | #endif |
85 | |
86 | if (numbits<=0 || numbits > 64) return; |
87 | iv = &(*ivec)[0]; |
88 | c2l(iv,v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
89 | c2l(iv,v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
90 | if (enc) |
91 | { |
92 | while (l >= (unsigned long)n) |
93 | { |
94 | l-=n; |
95 | ti[0]=v0; |
96 | ti[1]=v1; |
97 | DES_encrypt1((DES_LONGunsigned int *)ti,schedule,DES_ENCRYPT1); |
98 | c2ln(in,d0,d1,n){ in+=n; d0=d1=0; switch (n) { case 8: d1 =((unsigned int)(*( --(in))))<<24L; case 7: d1|=((unsigned int)(*(--(in)))) <<16L; case 6: d1|=((unsigned int)(*(--(in))))<< 8L ; case 5: d1|=((unsigned int)(*(--(in)))); case 4: d0 =((unsigned int)(*(--(in))))<<24L; case 3: d0|=((unsigned int)(*(-- (in))))<<16L; case 2: d0|=((unsigned int)(*(--(in))))<< 8L; case 1: d0|=((unsigned int)(*(--(in)))); } }; |
99 | in+=n; |
100 | d0^=ti[0]; |
101 | d1^=ti[1]; |
102 | l2cn(d0,d1,out,n){ out+=n; switch (n) { case 8: *(--(out))=(unsigned char)(((d1 )>>24L)&0xff); case 7: *(--(out))=(unsigned char)(( (d1)>>16L)&0xff); case 6: *(--(out))=(unsigned char )(((d1)>> 8L)&0xff); case 5: *(--(out))=(unsigned char )(((d1) )&0xff); case 4: *(--(out))=(unsigned char)(((d0) >>24L)&0xff); case 3: *(--(out))=(unsigned char)((( d0)>>16L)&0xff); case 2: *(--(out))=(unsigned char) (((d0)>> 8L)&0xff); case 1: *(--(out))=(unsigned char )(((d0) )&0xff); } }; |
103 | out+=n; |
104 | /* 30-08-94 - eay - changed because l>>32 and |
105 | * l<<32 are bad under gcc :-( */ |
106 | if (numbits == 32) |
107 | { v0=v1; v1=d0; } |
108 | else if (numbits == 64) |
109 | { v0=d0; v1=d1; } |
110 | else |
111 | { |
112 | #if BYTE_ORDER1234 != LITTLE_ENDIAN1234 |
113 | iv=&ovec[0]; |
114 | 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)); |
115 | l2c(v1,iv)(*((iv)++)=(unsigned char)(((v1) )&0xff), *((iv)++)=(unsigned char)(((v1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v1)>>16L)&0xff), *((iv)++)=(unsigned char)(((v1) >>24L)&0xff)); |
116 | l2c(d0,iv)(*((iv)++)=(unsigned char)(((d0) )&0xff), *((iv)++)=(unsigned char)(((d0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((d0)>>16L)&0xff), *((iv)++)=(unsigned char)(((d0) >>24L)&0xff)); |
117 | l2c(d1,iv)(*((iv)++)=(unsigned char)(((d1) )&0xff), *((iv)++)=(unsigned char)(((d1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((d1)>>16L)&0xff), *((iv)++)=(unsigned char)(((d1) >>24L)&0xff)); |
118 | #else |
119 | sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; |
120 | #endif |
121 | if (rem==0) |
122 | memmove(ovec,ovec+num,8); |
123 | else |
124 | for(i=0 ; i < 8 ; ++i) |
125 | ovec[i]=ovec[i+num]<<rem | |
126 | ovec[i+num+1]>>(8-rem); |
127 | #if BYTE_ORDER1234 == LITTLE_ENDIAN1234 |
128 | v0=sh[0], v1=sh[1]; |
129 | #else |
130 | iv=&ovec[0]; |
131 | c2l(iv,v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
132 | c2l(iv,v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
133 | #endif |
134 | } |
135 | } |
136 | } |
137 | else |
138 | { |
139 | while (l >= (unsigned long)n) |
140 | { |
141 | l-=n; |
142 | ti[0]=v0; |
143 | ti[1]=v1; |
144 | DES_encrypt1((DES_LONGunsigned int *)ti,schedule,DES_ENCRYPT1); |
145 | c2ln(in,d0,d1,n){ in+=n; d0=d1=0; switch (n) { case 8: d1 =((unsigned int)(*( --(in))))<<24L; case 7: d1|=((unsigned int)(*(--(in)))) <<16L; case 6: d1|=((unsigned int)(*(--(in))))<< 8L ; case 5: d1|=((unsigned int)(*(--(in)))); case 4: d0 =((unsigned int)(*(--(in))))<<24L; case 3: d0|=((unsigned int)(*(-- (in))))<<16L; case 2: d0|=((unsigned int)(*(--(in))))<< 8L; case 1: d0|=((unsigned int)(*(--(in)))); } }; |
146 | in+=n; |
147 | /* 30-08-94 - eay - changed because l>>32 and |
148 | * l<<32 are bad under gcc :-( */ |
149 | if (numbits == 32) |
150 | { v0=v1; v1=d0; } |
151 | else if (numbits == 64) |
152 | { v0=d0; v1=d1; } |
153 | else |
154 | { |
155 | #if BYTE_ORDER1234 != LITTLE_ENDIAN1234 |
156 | iv=&ovec[0]; |
157 | 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)); |
158 | l2c(v1,iv)(*((iv)++)=(unsigned char)(((v1) )&0xff), *((iv)++)=(unsigned char)(((v1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v1)>>16L)&0xff), *((iv)++)=(unsigned char)(((v1) >>24L)&0xff)); |
159 | l2c(d0,iv)(*((iv)++)=(unsigned char)(((d0) )&0xff), *((iv)++)=(unsigned char)(((d0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((d0)>>16L)&0xff), *((iv)++)=(unsigned char)(((d0) >>24L)&0xff)); |
160 | l2c(d1,iv)(*((iv)++)=(unsigned char)(((d1) )&0xff), *((iv)++)=(unsigned char)(((d1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((d1)>>16L)&0xff), *((iv)++)=(unsigned char)(((d1) >>24L)&0xff)); |
161 | #else |
162 | sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; |
163 | #endif |
164 | if (rem==0) |
165 | memmove(ovec,ovec+num,8); |
166 | else |
167 | for(i=0 ; i < 8 ; ++i) |
168 | ovec[i]=ovec[i+num]<<rem | |
169 | ovec[i+num+1]>>(8-rem); |
170 | #if BYTE_ORDER1234 == LITTLE_ENDIAN1234 |
171 | v0=sh[0], v1=sh[1]; |
172 | #else |
173 | iv=&ovec[0]; |
174 | c2l(iv,v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
175 | c2l(iv,v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
176 | #endif |
177 | } |
178 | d0^=ti[0]; |
179 | d1^=ti[1]; |
180 | l2cn(d0,d1,out,n){ out+=n; switch (n) { case 8: *(--(out))=(unsigned char)(((d1 )>>24L)&0xff); case 7: *(--(out))=(unsigned char)(( (d1)>>16L)&0xff); case 6: *(--(out))=(unsigned char )(((d1)>> 8L)&0xff); case 5: *(--(out))=(unsigned char )(((d1) )&0xff); case 4: *(--(out))=(unsigned char)(((d0) >>24L)&0xff); case 3: *(--(out))=(unsigned char)((( d0)>>16L)&0xff); case 2: *(--(out))=(unsigned char) (((d0)>> 8L)&0xff); case 1: *(--(out))=(unsigned char )(((d0) )&0xff); } }; |
181 | out+=n; |
182 | } |
183 | } |
184 | iv = &(*ivec)[0]; |
185 | 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)); |
186 | l2c(v1,iv)(*((iv)++)=(unsigned char)(((v1) )&0xff), *((iv)++)=(unsigned char)(((v1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v1)>>16L)&0xff), *((iv)++)=(unsigned char)(((v1) >>24L)&0xff)); |
187 | v0=v1=d0=d1=ti[0]=ti[1]=0; |
Value stored to 'v0' is never read | |
188 | } |
189 |