File: | src/lib/libcrypto/rc2/rc2_cbc.c |
Warning: | line 136, column 32 Although the value stored to 'xor0' is used in the enclosing expression, the value is never actually read from 'xor0' |
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1 | /* $OpenBSD: rc2_cbc.c,v 1.8 2023/07/07 13:40:44 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 <openssl/rc2.h> |
60 | #include "rc2_local.h" |
61 | |
62 | void |
63 | RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
64 | RC2_KEY *ks, unsigned char *iv, int encrypt) |
65 | { |
66 | unsigned long tin0, tin1; |
67 | unsigned long tout0, tout1, xor0, xor1; |
68 | long l = length; |
69 | unsigned long tin[2]; |
70 | |
71 | if (encrypt) { |
72 | c2l(iv, tout0)(tout0 =((unsigned long)(*((iv)++))) , tout0|=((unsigned long )(*((iv)++)))<< 8L, tout0|=((unsigned long)(*((iv)++))) <<16L, tout0|=((unsigned long)(*((iv)++)))<<24L); |
73 | c2l(iv, tout1)(tout1 =((unsigned long)(*((iv)++))) , tout1|=((unsigned long )(*((iv)++)))<< 8L, tout1|=((unsigned long)(*((iv)++))) <<16L, tout1|=((unsigned long)(*((iv)++)))<<24L); |
74 | iv -= 8; |
75 | for (l -= 8; l >= 0; l -= 8) |
76 | { |
77 | c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)( *((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<< 16L, tin0|=((unsigned long)(*((in)++)))<<24L); |
78 | c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)( *((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<< 16L, tin1|=((unsigned long)(*((in)++)))<<24L); |
79 | tin0 ^= tout0; |
80 | tin1 ^= tout1; |
81 | tin[0] = tin0; |
82 | tin[1] = tin1; |
83 | RC2_encrypt(tin, ks); |
84 | tout0 = tin[0]; |
85 | l2c(tout0, out)(*((out)++)=(unsigned char)(((tout0) )&0xff), *((out)++)= (unsigned char)(((tout0)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout0)>>16L)&0xff), *((out)++)=(unsigned char )(((tout0)>>24L)&0xff)); |
86 | tout1 = tin[1]; |
87 | l2c(tout1, out)(*((out)++)=(unsigned char)(((tout1) )&0xff), *((out)++)= (unsigned char)(((tout1)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout1)>>16L)&0xff), *((out)++)=(unsigned char )(((tout1)>>24L)&0xff)); |
88 | } |
89 | if (l != -8) { |
90 | c2ln(in, tin0, tin1, l + 8){ in+=l + 8; tin0=tin1=0; switch (l + 8) { case 8: tin1 =((unsigned long)(*(--(in))))<<24L; case 7: tin1|=((unsigned long) (*(--(in))))<<16L; case 6: tin1|=((unsigned long)(*(--( in))))<< 8L; case 5: tin1|=((unsigned long)(*(--(in)))) ; case 4: tin0 =((unsigned long)(*(--(in))))<<24L; case 3: tin0|=((unsigned long)(*(--(in))))<<16L; case 2: tin0 |=((unsigned long)(*(--(in))))<< 8L; case 1: tin0|=((unsigned long)(*(--(in)))); } }; |
91 | tin0 ^= tout0; |
92 | tin1 ^= tout1; |
93 | tin[0] = tin0; |
94 | tin[1] = tin1; |
95 | RC2_encrypt(tin, ks); |
96 | tout0 = tin[0]; |
97 | l2c(tout0, out)(*((out)++)=(unsigned char)(((tout0) )&0xff), *((out)++)= (unsigned char)(((tout0)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout0)>>16L)&0xff), *((out)++)=(unsigned char )(((tout0)>>24L)&0xff)); |
98 | tout1 = tin[1]; |
99 | l2c(tout1, out)(*((out)++)=(unsigned char)(((tout1) )&0xff), *((out)++)= (unsigned char)(((tout1)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout1)>>16L)&0xff), *((out)++)=(unsigned char )(((tout1)>>24L)&0xff)); |
100 | } |
101 | l2c(tout0, iv)(*((iv)++)=(unsigned char)(((tout0) )&0xff), *((iv)++)=(unsigned char)(((tout0)>> 8L)&0xff), *((iv)++)=(unsigned char )(((tout0)>>16L)&0xff), *((iv)++)=(unsigned char)(( (tout0)>>24L)&0xff)); |
102 | l2c(tout1, iv)(*((iv)++)=(unsigned char)(((tout1) )&0xff), *((iv)++)=(unsigned char)(((tout1)>> 8L)&0xff), *((iv)++)=(unsigned char )(((tout1)>>16L)&0xff), *((iv)++)=(unsigned char)(( (tout1)>>24L)&0xff)); |
103 | } else { |
104 | c2l(iv, xor0)(xor0 =((unsigned long)(*((iv)++))) , xor0|=((unsigned long)( *((iv)++)))<< 8L, xor0|=((unsigned long)(*((iv)++)))<< 16L, xor0|=((unsigned long)(*((iv)++)))<<24L); |
105 | c2l(iv, xor1)(xor1 =((unsigned long)(*((iv)++))) , xor1|=((unsigned long)( *((iv)++)))<< 8L, xor1|=((unsigned long)(*((iv)++)))<< 16L, xor1|=((unsigned long)(*((iv)++)))<<24L); |
106 | iv -= 8; |
107 | for (l -= 8; l >= 0; l -= 8) |
108 | { |
109 | c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)( *((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<< 16L, tin0|=((unsigned long)(*((in)++)))<<24L); |
110 | tin[0] = tin0; |
111 | c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)( *((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<< 16L, tin1|=((unsigned long)(*((in)++)))<<24L); |
112 | tin[1] = tin1; |
113 | RC2_decrypt(tin, ks); |
114 | tout0 = tin[0] ^ xor0; |
115 | tout1 = tin[1] ^ xor1; |
116 | l2c(tout0, out)(*((out)++)=(unsigned char)(((tout0) )&0xff), *((out)++)= (unsigned char)(((tout0)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout0)>>16L)&0xff), *((out)++)=(unsigned char )(((tout0)>>24L)&0xff)); |
117 | l2c(tout1, out)(*((out)++)=(unsigned char)(((tout1) )&0xff), *((out)++)= (unsigned char)(((tout1)>> 8L)&0xff), *((out)++)=(unsigned char)(((tout1)>>16L)&0xff), *((out)++)=(unsigned char )(((tout1)>>24L)&0xff)); |
118 | xor0 = tin0; |
119 | xor1 = tin1; |
120 | } |
121 | if (l != -8) { |
122 | c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)( *((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<< 16L, tin0|=((unsigned long)(*((in)++)))<<24L); |
123 | tin[0] = tin0; |
124 | c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)( *((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<< 16L, tin1|=((unsigned long)(*((in)++)))<<24L); |
125 | tin[1] = tin1; |
126 | RC2_decrypt(tin, ks); |
127 | tout0 = tin[0] ^ xor0; |
128 | tout1 = tin[1] ^ xor1; |
129 | l2cn(tout0, tout1, out, l + 8){ out+=l + 8; switch (l + 8) { case 8: *(--(out))=(unsigned char )(((tout1)>>24L)&0xff); case 7: *(--(out))=(unsigned char)(((tout1)>>16L)&0xff); case 6: *(--(out))=(unsigned char)(((tout1)>> 8L)&0xff); case 5: *(--(out))=(unsigned char)(((tout1) )&0xff); case 4: *(--(out))=(unsigned char )(((tout0)>>24L)&0xff); case 3: *(--(out))=(unsigned char)(((tout0)>>16L)&0xff); case 2: *(--(out))=(unsigned char)(((tout0)>> 8L)&0xff); case 1: *(--(out))=(unsigned char)(((tout0) )&0xff); } }; |
130 | xor0 = tin0; |
131 | xor1 = tin1; |
132 | } |
133 | l2c(xor0, iv)(*((iv)++)=(unsigned char)(((xor0) )&0xff), *((iv)++)=(unsigned char)(((xor0)>> 8L)&0xff), *((iv)++)=(unsigned char )(((xor0)>>16L)&0xff), *((iv)++)=(unsigned char)((( xor0)>>24L)&0xff)); |
134 | l2c(xor1, iv)(*((iv)++)=(unsigned char)(((xor1) )&0xff), *((iv)++)=(unsigned char)(((xor1)>> 8L)&0xff), *((iv)++)=(unsigned char )(((xor1)>>16L)&0xff), *((iv)++)=(unsigned char)((( xor1)>>24L)&0xff)); |
135 | } |
136 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
Although the value stored to 'xor0' is used in the enclosing expression, the value is never actually read from 'xor0' | |
137 | tin[0] = tin[1] = 0; |
138 | } |
139 | LCRYPTO_ALIAS(RC2_cbc_encrypt)asm(""); |
140 | |
141 | void |
142 | RC2_encrypt(unsigned long *d, RC2_KEY *key) |
143 | { |
144 | int i, n; |
145 | RC2_INTunsigned int *p0, *p1; |
146 | RC2_INTunsigned int x0, x1, x2, x3, t; |
147 | unsigned long l; |
148 | |
149 | l = d[0]; |
150 | x0 = (RC2_INTunsigned int)l & 0xffff; |
151 | x1 = (RC2_INTunsigned int)(l >> 16L); |
152 | l = d[1]; |
153 | x2 = (RC2_INTunsigned int)l & 0xffff; |
154 | x3 = (RC2_INTunsigned int)(l >> 16L); |
155 | |
156 | n = 3; |
157 | i = 5; |
158 | |
159 | p0 = p1 = &(key->data[0]); |
160 | for (;;) { |
161 | t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; |
162 | x0 = (t << 1)|(t >> 15); |
163 | t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; |
164 | x1 = (t << 2)|(t >> 14); |
165 | t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; |
166 | x2 = (t << 3)|(t >> 13); |
167 | t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; |
168 | x3 = (t << 5)|(t >> 11); |
169 | |
170 | if (--i == 0) { |
171 | if (--n == 0) |
172 | break; |
173 | i = (n == 2) ? 6 : 5; |
174 | |
175 | x0 += p1[x3 & 0x3f]; |
176 | x1 += p1[x0 & 0x3f]; |
177 | x2 += p1[x1 & 0x3f]; |
178 | x3 += p1[x2 & 0x3f]; |
179 | } |
180 | } |
181 | |
182 | d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << |
183 | 16L); |
184 | d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << |
185 | 16L); |
186 | } |
187 | LCRYPTO_ALIAS(RC2_encrypt)asm(""); |
188 | |
189 | void |
190 | RC2_decrypt(unsigned long *d, RC2_KEY *key) |
191 | { |
192 | int i, n; |
193 | RC2_INTunsigned int *p0, *p1; |
194 | RC2_INTunsigned int x0, x1, x2, x3, t; |
195 | unsigned long l; |
196 | |
197 | l = d[0]; |
198 | x0 = (RC2_INTunsigned int)l & 0xffff; |
199 | x1 = (RC2_INTunsigned int)(l >> 16L); |
200 | l = d[1]; |
201 | x2 = (RC2_INTunsigned int)l & 0xffff; |
202 | x3 = (RC2_INTunsigned int)(l >> 16L); |
203 | |
204 | n = 3; |
205 | i = 5; |
206 | |
207 | p0 = &(key->data[63]); |
208 | p1 = &(key->data[0]); |
209 | for (;;) { |
210 | t = ((x3 << 11)|(x3 >> 5)) & 0xffff; |
211 | x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; |
212 | t = ((x2 << 13)|(x2 >> 3)) & 0xffff; |
213 | x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; |
214 | t = ((x1 << 14)|(x1 >> 2)) & 0xffff; |
215 | x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; |
216 | t = ((x0 << 15)|(x0 >> 1)) & 0xffff; |
217 | x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; |
218 | |
219 | if (--i == 0) { |
220 | if (--n == 0) |
221 | break; |
222 | i = (n == 2) ? 6 : 5; |
223 | |
224 | x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; |
225 | x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; |
226 | x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; |
227 | x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; |
228 | } |
229 | } |
230 | |
231 | d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << |
232 | 16L); |
233 | d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << |
234 | 16L); |
235 | } |
236 | LCRYPTO_ALIAS(RC2_decrypt)asm(""); |