1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
58 #include <openssl/cast.h>
61 void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
63 register CAST_LONG l, r, t;
64 const register CAST_LONG *k;
70 E_CAST(0, k, l, r, +, ^, -);
71 E_CAST(1, k, r, l, ^, -, +);
72 E_CAST(2, k, l, r, -, +, ^);
73 E_CAST(3, k, r, l, +, ^, -);
74 E_CAST(4, k, l, r, ^, -, +);
75 E_CAST(5, k, r, l, -, +, ^);
76 E_CAST(6, k, l, r, +, ^, -);
77 E_CAST(7, k, r, l, ^, -, +);
78 E_CAST(8, k, l, r, -, +, ^);
79 E_CAST(9, k, r, l, +, ^, -);
80 E_CAST(10, k, l, r, ^, -, +);
81 E_CAST(11, k, r, l, -, +, ^);
82 if (!key->short_key) {
83 E_CAST(12, k, l, r, +, ^, -);
84 E_CAST(13, k, r, l, ^, -, +);
85 E_CAST(14, k, l, r, -, +, ^);
86 E_CAST(15, k, r, l, +, ^, -);
89 data[1] = l & 0xffffffffL;
90 data[0] = r & 0xffffffffL;
93 void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
95 register CAST_LONG l, r, t;
96 const register CAST_LONG *k;
102 if (!key->short_key) {
103 E_CAST(15, k, l, r, +, ^, -);
104 E_CAST(14, k, r, l, -, +, ^);
105 E_CAST(13, k, l, r, ^, -, +);
106 E_CAST(12, k, r, l, +, ^, -);
108 E_CAST(11, k, l, r, -, +, ^);
109 E_CAST(10, k, r, l, ^, -, +);
110 E_CAST(9, k, l, r, +, ^, -);
111 E_CAST(8, k, r, l, -, +, ^);
112 E_CAST(7, k, l, r, ^, -, +);
113 E_CAST(6, k, r, l, +, ^, -);
114 E_CAST(5, k, l, r, -, +, ^);
115 E_CAST(4, k, r, l, ^, -, +);
116 E_CAST(3, k, l, r, +, ^, -);
117 E_CAST(2, k, r, l, -, +, ^);
118 E_CAST(1, k, l, r, ^, -, +);
119 E_CAST(0, k, r, l, +, ^, -);
121 data[1] = l & 0xffffffffL;
122 data[0] = r & 0xffffffffL;
125 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
126 long length, const CAST_KEY *ks, unsigned char *iv,
129 register CAST_LONG tin0, tin1;
130 register CAST_LONG tout0, tout1, xor0, xor1;
131 register long l = length;
138 for (l -= 8; l >= 0; l -= 8) {
145 CAST_encrypt(tin, ks);
152 n2ln(in, tin0, tin1, l + 8);
157 CAST_encrypt(tin, ks);
169 for (l -= 8; l >= 0; l -= 8) {
174 CAST_decrypt(tin, ks);
175 tout0 = tin[0] ^ xor0;
176 tout1 = tin[1] ^ xor1;
187 CAST_decrypt(tin, ks);
188 tout0 = tin[0] ^ xor0;
189 tout1 = tin[1] ^ xor1;
190 l2nn(tout0, tout1, out, l + 8);
197 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;