1 /* crypto/cast/c_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 #include <openssl/cast.h>
62 void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
64 register CAST_LONG l, r, t;
65 const register CAST_LONG *k;
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, +, ^, -);
90 data[1] = l & 0xffffffffL;
91 data[0] = r & 0xffffffffL;
94 void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
96 register CAST_LONG l, r, t;
97 const register CAST_LONG *k;
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, +, ^, -);
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, +, ^, -);
122 data[1] = l & 0xffffffffL;
123 data[0] = r & 0xffffffffL;
126 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
127 long length, const CAST_KEY *ks, unsigned char *iv,
130 register CAST_LONG tin0, tin1;
131 register CAST_LONG tout0, tout1, xor0, xor1;
132 register long l = length;
139 for (l -= 8; l >= 0; l -= 8) {
146 CAST_encrypt(tin, ks);
153 n2ln(in, tin0, tin1, l + 8);
158 CAST_encrypt(tin, ks);
170 for (l -= 8; l >= 0; l -= 8) {
175 CAST_decrypt(tin, ks);
176 tout0 = tin[0] ^ xor0;
177 tout1 = tin[1] ^ xor1;
188 CAST_decrypt(tin, ks);
189 tout0 = tin[0] ^ xor0;
190 tout1 = tin[1] ^ xor1;
191 l2nn(tout0, tout1, out, l + 8);
198 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;