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 <openssl/cast.h>
60 #include "cast_lcl.h"
61
CAST_encrypt(CAST_LONG * data,CAST_KEY * key)62 void CAST_encrypt(CAST_LONG *data, CAST_KEY *key)
63 {
64 register CAST_LONG l,r,*k,t;
65
66 k= &(key->data[0]);
67 l=data[0];
68 r=data[1];
69
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 {
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
90 data[1]=l&0xffffffffL;
91 data[0]=r&0xffffffffL;
92 }
93
CAST_decrypt(CAST_LONG * data,CAST_KEY * key)94 void CAST_decrypt(CAST_LONG *data, CAST_KEY *key)
95 {
96 register CAST_LONG l,r,*k,t;
97
98 k= &(key->data[0]);
99 l=data[0];
100 r=data[1];
101
102 if(!key->short_key)
103 {
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,+,^,-);
121
122 data[1]=l&0xffffffffL;
123 data[0]=r&0xffffffffL;
124 }
125
CAST_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,CAST_KEY * ks,unsigned char * iv,int enc)126 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
127 CAST_KEY *ks, unsigned char *iv, int enc)
128 {
129 register CAST_LONG tin0,tin1;
130 register CAST_LONG tout0,tout1,xor0,xor1;
131 register long l=length;
132 CAST_LONG tin[2];
133
134 if (enc)
135 {
136 n2l(iv,tout0);
137 n2l(iv,tout1);
138 iv-=8;
139 for (l-=8; l>=0; l-=8)
140 {
141 n2l(in,tin0);
142 n2l(in,tin1);
143 tin0^=tout0;
144 tin1^=tout1;
145 tin[0]=tin0;
146 tin[1]=tin1;
147 CAST_encrypt(tin,ks);
148 tout0=tin[0];
149 tout1=tin[1];
150 l2n(tout0,out);
151 l2n(tout1,out);
152 }
153 if (l != -8)
154 {
155 n2ln(in,tin0,tin1,l+8);
156 tin0^=tout0;
157 tin1^=tout1;
158 tin[0]=tin0;
159 tin[1]=tin1;
160 CAST_encrypt(tin,ks);
161 tout0=tin[0];
162 tout1=tin[1];
163 l2n(tout0,out);
164 l2n(tout1,out);
165 }
166 l2n(tout0,iv);
167 l2n(tout1,iv);
168 }
169 else
170 {
171 n2l(iv,xor0);
172 n2l(iv,xor1);
173 iv-=8;
174 for (l-=8; l>=0; l-=8)
175 {
176 n2l(in,tin0);
177 n2l(in,tin1);
178 tin[0]=tin0;
179 tin[1]=tin1;
180 CAST_decrypt(tin,ks);
181 tout0=tin[0]^xor0;
182 tout1=tin[1]^xor1;
183 l2n(tout0,out);
184 l2n(tout1,out);
185 xor0=tin0;
186 xor1=tin1;
187 }
188 if (l != -8)
189 {
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 }
207
208