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-rw-r--r--src/lib/libcrypto/cast/c_enc.c207
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diff --git a/src/lib/libcrypto/cast/c_enc.c b/src/lib/libcrypto/cast/c_enc.c
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1/* $OpenBSD: c_enc.c,v 1.10 2023/07/08 10:43:59 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/cast.h>
60#include "cast_local.h"
61
62#ifndef OPENBSD_CAST_ASM
63void
64CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
65{
66 CAST_LONG l, r, t;
67 const CAST_LONG *k;
68
69 k = &(key->data[0]);
70 l = data[0];
71 r = data[1];
72
73 E_CAST( 0, k,l, r,+,^, -);
74 E_CAST( 1, k,r, l,^, -,+);
75 E_CAST( 2, k,l, r, -,+,^);
76 E_CAST( 3, k,r, l,+,^, -);
77 E_CAST( 4, k,l, r,^, -,+);
78 E_CAST( 5, k,r, l, -,+,^);
79 E_CAST( 6, k,l, r,+,^, -);
80 E_CAST( 7, k,r, l,^, -,+);
81 E_CAST( 8, k,l, r, -,+,^);
82 E_CAST( 9, k,r, l,+,^, -);
83 E_CAST(10, k,l, r,^, -,+);
84 E_CAST(11, k,r, l, -,+,^);
85 if (!key->short_key) {
86 E_CAST(12, k,l, r,+,^, -);
87 E_CAST(13, k,r, l,^, -,+);
88 E_CAST(14, k,l, r, -,+,^);
89 E_CAST(15, k,r, l,+,^, -);
90 }
91
92 data[1] = l&0xffffffffL;
93 data[0] = r&0xffffffffL;
94}
95LCRYPTO_ALIAS(CAST_encrypt);
96
97void
98CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
99{
100 CAST_LONG l, r, t;
101 const CAST_LONG *k;
102
103 k = &(key->data[0]);
104 l = data[0];
105 r = data[1];
106
107 if (!key->short_key) {
108 E_CAST(15, k,l, r,+,^, -);
109 E_CAST(14, k,r, l, -,+,^);
110 E_CAST(13, k,l, r,^, -,+);
111 E_CAST(12, k,r, l,+,^, -);
112 }
113 E_CAST(11, k,l, r, -,+,^);
114 E_CAST(10, k,r, l,^, -,+);
115 E_CAST( 9, k,l, r,+,^, -);
116 E_CAST( 8, k,r, l, -,+,^);
117 E_CAST( 7, k,l, r,^, -,+);
118 E_CAST( 6, k,r, l,+,^, -);
119 E_CAST( 5, k,l, r, -,+,^);
120 E_CAST( 4, k,r, l,^, -,+);
121 E_CAST( 3, k,l, r,+,^, -);
122 E_CAST( 2, k,r, l, -,+,^);
123 E_CAST( 1, k,l, r,^, -,+);
124 E_CAST( 0, k,r, l,+,^, -);
125
126 data[1] = l&0xffffffffL;
127 data[0] = r&0xffffffffL;
128}
129LCRYPTO_ALIAS(CAST_decrypt);
130#endif
131
132void
133CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
134 const CAST_KEY *ks, unsigned char *iv, int enc)
135{
136 CAST_LONG tin0, tin1;
137 CAST_LONG tout0, tout1, xor0, xor1;
138 long l = length;
139 CAST_LONG tin[2];
140
141 if (enc) {
142 n2l(iv, tout0);
143 n2l(iv, tout1);
144 iv -= 8;
145 for (l -= 8; l >= 0; l -= 8) {
146 n2l(in, tin0);
147 n2l(in, tin1);
148 tin0 ^= tout0;
149 tin1 ^= tout1;
150 tin[0] = tin0;
151 tin[1] = tin1;
152 CAST_encrypt(tin, ks);
153 tout0 = tin[0];
154 tout1 = tin[1];
155 l2n(tout0, out);
156 l2n(tout1, out);
157 }
158 if (l != -8) {
159 n2ln(in, tin0, tin1, l + 8);
160 tin0 ^= tout0;
161 tin1 ^= tout1;
162 tin[0] = tin0;
163 tin[1] = tin1;
164 CAST_encrypt(tin, ks);
165 tout0 = tin[0];
166 tout1 = tin[1];
167 l2n(tout0, out);
168 l2n(tout1, out);
169 }
170 l2n(tout0, iv);
171 l2n(tout1, iv);
172 } else {
173 n2l(iv, xor0);
174 n2l(iv, xor1);
175 iv -= 8;
176 for (l -= 8; l >= 0; l -= 8) {
177 n2l(in, tin0);
178 n2l(in, tin1);
179 tin[0] = tin0;
180 tin[1] = tin1;
181 CAST_decrypt(tin, ks);
182 tout0 = tin[0]^xor0;
183 tout1 = tin[1]^xor1;
184 l2n(tout0, out);
185 l2n(tout1, out);
186 xor0 = tin0;
187 xor1 = tin1;
188 }
189 if (l != -8) {
190 n2l(in, tin0);
191 n2l(in, tin1);
192 tin[0] = tin0;
193 tin[1] = tin1;
194 CAST_decrypt(tin, ks);
195 tout0 = tin[0]^xor0;
196 tout1 = tin[1]^xor1;
197 l2nn(tout0, tout1, out, l + 8);
198 xor0 = tin0;
199 xor1 = tin1;
200 }
201 l2n(xor0, iv);
202 l2n(xor1, iv);
203 }
204 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
205 tin[0] = tin[1] = 0;
206}
207LCRYPTO_ALIAS(CAST_cbc_encrypt);
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-04 05:57:14 +0000