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58964a49 RE |
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. | |
ae5c8664 | 8 | * |
58964a49 RE |
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). | |
ae5c8664 | 15 | * |
58964a49 RE |
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. | |
ae5c8664 | 22 | * |
58964a49 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
58964a49 RE |
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. | |
ae5c8664 | 52 | * |
58964a49 RE |
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 | ||
ec577822 | 59 | #include <openssl/cast.h> |
58964a49 RE |
60 | #include "cast_lcl.h" |
61 | ||
a0b72777 | 62 | void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key) |
ae5c8664 MC |
63 | { |
64 | register CAST_LONG l, r, t; | |
65 | const register CAST_LONG *k; | |
58964a49 | 66 | |
ae5c8664 MC |
67 | k = &(key->data[0]); |
68 | l = data[0]; | |
69 | r = data[1]; | |
58964a49 | 70 | |
ae5c8664 MC |
71 | E_CAST(0, k, l, r, +, ^, -); |
72 | E_CAST(1, k, r, l, ^, -, +); | |
73 | E_CAST(2, k, l, r, -, +, ^); | |
74 | E_CAST(3, k, r, l, +, ^, -); | |
75 | E_CAST(4, k, l, r, ^, -, +); | |
76 | E_CAST(5, k, r, l, -, +, ^); | |
77 | E_CAST(6, k, l, r, +, ^, -); | |
78 | E_CAST(7, k, r, l, ^, -, +); | |
79 | E_CAST(8, k, l, r, -, +, ^); | |
80 | E_CAST(9, k, r, l, +, ^, -); | |
81 | E_CAST(10, k, l, r, ^, -, +); | |
82 | E_CAST(11, k, r, l, -, +, ^); | |
83 | if (!key->short_key) { | |
84 | E_CAST(12, k, l, r, +, ^, -); | |
85 | E_CAST(13, k, r, l, ^, -, +); | |
86 | E_CAST(14, k, l, r, -, +, ^); | |
87 | E_CAST(15, k, r, l, +, ^, -); | |
88 | } | |
58964a49 | 89 | |
ae5c8664 MC |
90 | data[1] = l & 0xffffffffL; |
91 | data[0] = r & 0xffffffffL; | |
92 | } | |
58964a49 | 93 | |
a0b72777 | 94 | void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key) |
ae5c8664 MC |
95 | { |
96 | register CAST_LONG l, r, t; | |
97 | const register CAST_LONG *k; | |
58964a49 | 98 | |
ae5c8664 MC |
99 | k = &(key->data[0]); |
100 | l = data[0]; | |
101 | r = data[1]; | |
58964a49 | 102 | |
ae5c8664 MC |
103 | if (!key->short_key) { |
104 | E_CAST(15, k, l, r, +, ^, -); | |
105 | E_CAST(14, k, r, l, -, +, ^); | |
106 | E_CAST(13, k, l, r, ^, -, +); | |
107 | E_CAST(12, k, r, l, +, ^, -); | |
108 | } | |
109 | E_CAST(11, k, l, r, -, +, ^); | |
110 | E_CAST(10, k, r, l, ^, -, +); | |
111 | E_CAST(9, k, l, r, +, ^, -); | |
112 | E_CAST(8, k, r, l, -, +, ^); | |
113 | E_CAST(7, k, l, r, ^, -, +); | |
114 | E_CAST(6, k, r, l, +, ^, -); | |
115 | E_CAST(5, k, l, r, -, +, ^); | |
116 | E_CAST(4, k, r, l, ^, -, +); | |
117 | E_CAST(3, k, l, r, +, ^, -); | |
118 | E_CAST(2, k, r, l, -, +, ^); | |
119 | E_CAST(1, k, l, r, ^, -, +); | |
120 | E_CAST(0, k, r, l, +, ^, -); | |
58964a49 | 121 | |
ae5c8664 MC |
122 | data[1] = l & 0xffffffffL; |
123 | data[0] = r & 0xffffffffL; | |
124 | } | |
58964a49 | 125 | |
ae5c8664 MC |
126 | 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]; | |
58964a49 | 134 | |
ae5c8664 MC |
135 | if (enc) { |
136 | n2l(iv, tout0); | |
137 | n2l(iv, tout1); | |
138 | iv -= 8; | |
139 | for (l -= 8; l >= 0; l -= 8) { | |
140 | n2l(in, tin0); | |
141 | n2l(in, tin1); | |
142 | tin0 ^= tout0; | |
143 | tin1 ^= tout1; | |
144 | tin[0] = tin0; | |
145 | tin[1] = tin1; | |
146 | CAST_encrypt(tin, ks); | |
147 | tout0 = tin[0]; | |
148 | tout1 = tin[1]; | |
149 | l2n(tout0, out); | |
150 | l2n(tout1, out); | |
151 | } | |
152 | if (l != -8) { | |
153 | n2ln(in, tin0, tin1, l + 8); | |
154 | tin0 ^= tout0; | |
155 | tin1 ^= tout1; | |
156 | tin[0] = tin0; | |
157 | tin[1] = tin1; | |
158 | CAST_encrypt(tin, ks); | |
159 | tout0 = tin[0]; | |
160 | tout1 = tin[1]; | |
161 | l2n(tout0, out); | |
162 | l2n(tout1, out); | |
163 | } | |
164 | l2n(tout0, iv); | |
165 | l2n(tout1, iv); | |
166 | } else { | |
167 | n2l(iv, xor0); | |
168 | n2l(iv, xor1); | |
169 | iv -= 8; | |
170 | for (l -= 8; l >= 0; l -= 8) { | |
171 | n2l(in, tin0); | |
172 | n2l(in, tin1); | |
173 | tin[0] = tin0; | |
174 | tin[1] = tin1; | |
175 | CAST_decrypt(tin, ks); | |
176 | tout0 = tin[0] ^ xor0; | |
177 | tout1 = tin[1] ^ xor1; | |
178 | l2n(tout0, out); | |
179 | l2n(tout1, out); | |
180 | xor0 = tin0; | |
181 | xor1 = tin1; | |
182 | } | |
183 | if (l != -8) { | |
184 | n2l(in, tin0); | |
185 | n2l(in, tin1); | |
186 | tin[0] = tin0; | |
187 | tin[1] = tin1; | |
188 | CAST_decrypt(tin, ks); | |
189 | tout0 = tin[0] ^ xor0; | |
190 | tout1 = tin[1] ^ xor1; | |
191 | l2nn(tout0, tout1, out, l + 8); | |
192 | xor0 = tin0; | |
193 | xor1 = tin1; | |
194 | } | |
195 | l2n(xor0, iv); | |
196 | l2n(xor1, iv); | |
197 | } | |
198 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; | |
199 | tin[0] = tin[1] = 0; | |
200 | } |