Line data Source code
1 : /* crypto/cast/c_enc.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/cast.h>
60 : #include "cast_lcl.h"
61 :
62 0 : void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
63 : {
64 : register CAST_LONG l, r, t;
65 : const register CAST_LONG *k;
66 :
67 : k = &(key->data[0]);
68 0 : l = data[0];
69 0 : r = data[1];
70 :
71 0 : E_CAST(0, k, l, r, +, ^, -);
72 0 : E_CAST(1, k, r, l, ^, -, +);
73 0 : E_CAST(2, k, l, r, -, +, ^);
74 0 : E_CAST(3, k, r, l, +, ^, -);
75 0 : E_CAST(4, k, l, r, ^, -, +);
76 0 : E_CAST(5, k, r, l, -, +, ^);
77 0 : E_CAST(6, k, l, r, +, ^, -);
78 0 : E_CAST(7, k, r, l, ^, -, +);
79 0 : E_CAST(8, k, l, r, -, +, ^);
80 0 : E_CAST(9, k, r, l, +, ^, -);
81 0 : E_CAST(10, k, l, r, ^, -, +);
82 0 : E_CAST(11, k, r, l, -, +, ^);
83 0 : if (!key->short_key) {
84 0 : E_CAST(12, k, l, r, +, ^, -);
85 0 : E_CAST(13, k, r, l, ^, -, +);
86 0 : E_CAST(14, k, l, r, -, +, ^);
87 0 : E_CAST(15, k, r, l, +, ^, -);
88 : }
89 :
90 0 : data[1] = l & 0xffffffffL;
91 0 : data[0] = r & 0xffffffffL;
92 0 : }
93 :
94 0 : void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
95 : {
96 : register CAST_LONG l, r, t;
97 : const register CAST_LONG *k;
98 :
99 : k = &(key->data[0]);
100 0 : l = data[0];
101 0 : r = data[1];
102 :
103 0 : if (!key->short_key) {
104 0 : E_CAST(15, k, l, r, +, ^, -);
105 0 : E_CAST(14, k, r, l, -, +, ^);
106 0 : E_CAST(13, k, l, r, ^, -, +);
107 0 : E_CAST(12, k, r, l, +, ^, -);
108 : }
109 0 : E_CAST(11, k, l, r, -, +, ^);
110 0 : E_CAST(10, k, r, l, ^, -, +);
111 0 : E_CAST(9, k, l, r, +, ^, -);
112 0 : E_CAST(8, k, r, l, -, +, ^);
113 0 : E_CAST(7, k, l, r, ^, -, +);
114 0 : E_CAST(6, k, r, l, +, ^, -);
115 0 : E_CAST(5, k, l, r, -, +, ^);
116 0 : E_CAST(4, k, r, l, ^, -, +);
117 0 : E_CAST(3, k, l, r, +, ^, -);
118 0 : E_CAST(2, k, r, l, -, +, ^);
119 0 : E_CAST(1, k, l, r, ^, -, +);
120 0 : E_CAST(0, k, r, l, +, ^, -);
121 :
122 0 : data[1] = l & 0xffffffffL;
123 0 : data[0] = r & 0xffffffffL;
124 0 : }
125 :
126 0 : void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
127 : long length, const CAST_KEY *ks, unsigned char *iv,
128 : int enc)
129 : {
130 : register CAST_LONG tin0, tin1;
131 : register CAST_LONG tout0, tout1, xor0, xor1;
132 : register long l = length;
133 : CAST_LONG tin[2];
134 :
135 0 : if (enc) {
136 0 : n2l(iv, tout0);
137 0 : n2l(iv, tout1);
138 : iv -= 8;
139 0 : for (l -= 8; l >= 0; l -= 8) {
140 0 : n2l(in, tin0);
141 0 : n2l(in, tin1);
142 0 : tin0 ^= tout0;
143 0 : tin1 ^= tout1;
144 0 : tin[0] = tin0;
145 0 : tin[1] = tin1;
146 0 : CAST_encrypt(tin, ks);
147 0 : tout0 = tin[0];
148 0 : tout1 = tin[1];
149 0 : l2n(tout0, out);
150 0 : l2n(tout1, out);
151 : }
152 0 : if (l != -8) {
153 0 : n2ln(in, tin0, tin1, l + 8);
154 0 : tin0 ^= tout0;
155 0 : tin1 ^= tout1;
156 0 : tin[0] = tin0;
157 0 : tin[1] = tin1;
158 0 : CAST_encrypt(tin, ks);
159 0 : tout0 = tin[0];
160 0 : tout1 = tin[1];
161 0 : l2n(tout0, out);
162 0 : l2n(tout1, out);
163 : }
164 0 : l2n(tout0, iv);
165 0 : l2n(tout1, iv);
166 : } else {
167 0 : n2l(iv, xor0);
168 0 : n2l(iv, xor1);
169 : iv -= 8;
170 0 : for (l -= 8; l >= 0; l -= 8) {
171 0 : n2l(in, tin0);
172 0 : n2l(in, tin1);
173 0 : tin[0] = tin0;
174 0 : tin[1] = tin1;
175 0 : CAST_decrypt(tin, ks);
176 0 : tout0 = tin[0] ^ xor0;
177 0 : tout1 = tin[1] ^ xor1;
178 0 : l2n(tout0, out);
179 0 : l2n(tout1, out);
180 : xor0 = tin0;
181 : xor1 = tin1;
182 : }
183 0 : if (l != -8) {
184 0 : n2l(in, tin0);
185 0 : n2l(in, tin1);
186 0 : tin[0] = tin0;
187 0 : tin[1] = tin1;
188 0 : CAST_decrypt(tin, ks);
189 0 : tout0 = tin[0] ^ xor0;
190 0 : tout1 = tin[1] ^ xor1;
191 0 : l2nn(tout0, tout1, out, l + 8);
192 : xor0 = tin0;
193 : xor1 = tin1;
194 : }
195 0 : l2n(xor0, iv);
196 0 : l2n(xor1, iv);
197 : }
198 : tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
199 : tin[0] = tin[1] = 0;
200 0 : }
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