Line data Source code
1 : /* crypto/rc2/rc2_cbc.c */
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_locl.h"
61 :
62 0 : void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
63 : RC2_KEY *ks, unsigned char *iv, int encrypt)
64 : {
65 : register unsigned long tin0, tin1;
66 : register unsigned long tout0, tout1, xor0, xor1;
67 : register long l = length;
68 : unsigned long tin[2];
69 :
70 0 : if (encrypt) {
71 0 : c2l(iv, tout0);
72 0 : c2l(iv, tout1);
73 : iv -= 8;
74 0 : for (l -= 8; l >= 0; l -= 8) {
75 0 : c2l(in, tin0);
76 0 : c2l(in, tin1);
77 0 : tin0 ^= tout0;
78 0 : tin1 ^= tout1;
79 0 : tin[0] = tin0;
80 0 : tin[1] = tin1;
81 0 : RC2_encrypt(tin, ks);
82 0 : tout0 = tin[0];
83 0 : l2c(tout0, out);
84 0 : tout1 = tin[1];
85 0 : l2c(tout1, out);
86 : }
87 0 : if (l != -8) {
88 0 : c2ln(in, tin0, tin1, l + 8);
89 0 : tin0 ^= tout0;
90 0 : tin1 ^= tout1;
91 0 : tin[0] = tin0;
92 0 : tin[1] = tin1;
93 0 : RC2_encrypt(tin, ks);
94 0 : tout0 = tin[0];
95 0 : l2c(tout0, out);
96 0 : tout1 = tin[1];
97 0 : l2c(tout1, out);
98 : }
99 0 : l2c(tout0, iv);
100 0 : l2c(tout1, iv);
101 : } else {
102 0 : c2l(iv, xor0);
103 0 : c2l(iv, xor1);
104 : iv -= 8;
105 0 : for (l -= 8; l >= 0; l -= 8) {
106 0 : c2l(in, tin0);
107 0 : tin[0] = tin0;
108 0 : c2l(in, tin1);
109 0 : tin[1] = tin1;
110 0 : RC2_decrypt(tin, ks);
111 0 : tout0 = tin[0] ^ xor0;
112 0 : tout1 = tin[1] ^ xor1;
113 0 : l2c(tout0, out);
114 0 : l2c(tout1, out);
115 : xor0 = tin0;
116 : xor1 = tin1;
117 : }
118 0 : if (l != -8) {
119 0 : c2l(in, tin0);
120 0 : tin[0] = tin0;
121 0 : c2l(in, tin1);
122 0 : tin[1] = tin1;
123 0 : RC2_decrypt(tin, ks);
124 0 : tout0 = tin[0] ^ xor0;
125 0 : tout1 = tin[1] ^ xor1;
126 0 : l2cn(tout0, tout1, out, l + 8);
127 : xor0 = tin0;
128 : xor1 = tin1;
129 : }
130 0 : l2c(xor0, iv);
131 0 : l2c(xor1, iv);
132 : }
133 : tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
134 : tin[0] = tin[1] = 0;
135 0 : }
136 :
137 0 : void RC2_encrypt(unsigned long *d, RC2_KEY *key)
138 : {
139 : int i, n;
140 : register RC2_INT *p0, *p1;
141 : register RC2_INT x0, x1, x2, x3, t;
142 : unsigned long l;
143 :
144 0 : l = d[0];
145 0 : x0 = (RC2_INT) l & 0xffff;
146 0 : x1 = (RC2_INT) (l >> 16L);
147 0 : l = d[1];
148 0 : x2 = (RC2_INT) l & 0xffff;
149 0 : x3 = (RC2_INT) (l >> 16L);
150 :
151 : n = 3;
152 : i = 5;
153 :
154 0 : p0 = p1 = &(key->data[0]);
155 : for (;;) {
156 0 : t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
157 0 : x0 = (t << 1) | (t >> 15);
158 0 : t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
159 0 : x1 = (t << 2) | (t >> 14);
160 0 : t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
161 0 : x2 = (t << 3) | (t >> 13);
162 0 : t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
163 0 : x3 = (t << 5) | (t >> 11);
164 :
165 0 : if (--i == 0) {
166 0 : if (--n == 0)
167 : break;
168 0 : i = (n == 2) ? 6 : 5;
169 :
170 0 : x0 += p1[x3 & 0x3f];
171 0 : x1 += p1[x0 & 0x3f];
172 0 : x2 += p1[x1 & 0x3f];
173 0 : x3 += p1[x2 & 0x3f];
174 : }
175 : }
176 :
177 0 : d[0] =
178 0 : (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
179 0 : d[1] =
180 0 : (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
181 0 : }
182 :
183 0 : void RC2_decrypt(unsigned long *d, RC2_KEY *key)
184 : {
185 : int i, n;
186 : register RC2_INT *p0, *p1;
187 : register RC2_INT x0, x1, x2, x3, t;
188 : unsigned long l;
189 :
190 0 : l = d[0];
191 0 : x0 = (RC2_INT) l & 0xffff;
192 0 : x1 = (RC2_INT) (l >> 16L);
193 0 : l = d[1];
194 0 : x2 = (RC2_INT) l & 0xffff;
195 0 : x3 = (RC2_INT) (l >> 16L);
196 :
197 : n = 3;
198 : i = 5;
199 :
200 0 : p0 = &(key->data[63]);
201 0 : p1 = &(key->data[0]);
202 : for (;;) {
203 0 : t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
204 0 : x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
205 0 : t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
206 0 : x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
207 0 : t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
208 0 : x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
209 0 : t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
210 0 : x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
211 :
212 0 : if (--i == 0) {
213 0 : if (--n == 0)
214 : break;
215 0 : i = (n == 2) ? 6 : 5;
216 :
217 0 : x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
218 0 : x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
219 0 : x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
220 0 : x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
221 : }
222 : }
223 :
224 0 : d[0] =
225 0 : (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
226 0 : d[1] =
227 0 : (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
228 0 : }
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