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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 "cast.h"
60#include "cast_lcl.h"
61
62void CAST_encrypt(data,key)
63CAST_LONG *data;
64CAST_KEY *key;
65 {
66 register CAST_LONG l,r,*k,t;
67
68 k= &(key->data[0]);
69 l=data[0];
70 r=data[1];
71
72 E_CAST( 0,k,l,r,+,^,-);
73 E_CAST( 1,k,r,l,^,-,+);
74 E_CAST( 2,k,l,r,-,+,^);
75 E_CAST( 3,k,r,l,+,^,-);
76 E_CAST( 4,k,l,r,^,-,+);
77 E_CAST( 5,k,r,l,-,+,^);
78 E_CAST( 6,k,l,r,+,^,-);
79 E_CAST( 7,k,r,l,^,-,+);
80 E_CAST( 8,k,l,r,-,+,^);
81 E_CAST( 9,k,r,l,+,^,-);
82 E_CAST(10,k,l,r,^,-,+);
83 E_CAST(11,k,r,l,-,+,^);
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
89 data[1]=l&0xffffffffL;
90 data[0]=r&0xffffffffL;
91 }
92
93void CAST_decrypt(data,key)
94CAST_LONG *data;
95CAST_KEY *key;
96 {
97 register CAST_LONG l,r,*k,t;
98
99 k= &(key->data[0]);
100 l=data[0];
101 r=data[1];
102
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,+,^,-);
107 E_CAST(11,k,l,r,-,+,^);
108 E_CAST(10,k,r,l,^,-,+);
109 E_CAST( 9,k,l,r,+,^,-);
110 E_CAST( 8,k,r,l,-,+,^);
111 E_CAST( 7,k,l,r,^,-,+);
112 E_CAST( 6,k,r,l,+,^,-);
113 E_CAST( 5,k,l,r,-,+,^);
114 E_CAST( 4,k,r,l,^,-,+);
115 E_CAST( 3,k,l,r,+,^,-);
116 E_CAST( 2,k,r,l,-,+,^);
117 E_CAST( 1,k,l,r,^,-,+);
118 E_CAST( 0,k,r,l,+,^,-);
119
120 data[1]=l&0xffffffffL;
121 data[0]=r&0xffffffffL;
122 }
123
124void CAST_cbc_encrypt(in, out, length, ks, iv, encrypt)
125unsigned char *in;
126unsigned char *out;
127long length;
128CAST_KEY *ks;
129unsigned char *iv;
130int encrypt;
131 {
132 register CAST_LONG tin0,tin1;
133 register CAST_LONG tout0,tout1,xor0,xor1;
134 register long l=length;
135 CAST_LONG tin[2];
136
137 if (encrypt)
138 {
139 n2l(iv,tout0);
140 n2l(iv,tout1);
141 iv-=8;
142 for (l-=8; l>=0; l-=8)
143 {
144 n2l(in,tin0);
145 n2l(in,tin1);
146 tin0^=tout0;
147 tin1^=tout1;
148 tin[0]=tin0;
149 tin[1]=tin1;
150 CAST_encrypt(tin,ks);
151 tout0=tin[0];
152 tout1=tin[1];
153 l2n(tout0,out);
154 l2n(tout1,out);
155 }
156 if (l != -8)
157 {
158 n2ln(in,tin0,tin1,l+8);
159 tin0^=tout0;
160 tin1^=tout1;
161 tin[0]=tin0;
162 tin[1]=tin1;
163 CAST_encrypt(tin,ks);
164 tout0=tin[0];
165 tout1=tin[1];
166 l2n(tout0,out);
167 l2n(tout1,out);
168 }
169 l2n(tout0,iv);
170 l2n(tout1,iv);
171 }
172 else
173 {
174 n2l(iv,xor0);
175 n2l(iv,xor1);
176 iv-=8;
177 for (l-=8; l>=0; l-=8)
178 {
179 n2l(in,tin0);
180 n2l(in,tin1);
181 tin[0]=tin0;
182 tin[1]=tin1;
183 CAST_decrypt(tin,ks);
184 tout0=tin[0]^xor0;
185 tout1=tin[1]^xor1;
186 l2n(tout0,out);
187 l2n(tout1,out);
188 xor0=tin0;
189 xor1=tin1;
190 }
191 if (l != -8)
192 {
193 n2l(in,tin0);
194 n2l(in,tin1);
195 tin[0]=tin0;
196 tin[1]=tin1;
197 CAST_decrypt(tin,ks);
198 tout0=tin[0]^xor0;
199 tout1=tin[1]^xor1;
200 l2nn(tout0,tout1,out,l+8);
201 xor0=tin0;
202 xor1=tin1;
203 }
204 l2n(xor0,iv);
205 l2n(xor1,iv);
206 }
207 tin0=tin1=tout0=tout1=xor0=xor1=0;
208 tin[0]=tin[1]=0;
209 }
210
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