1 /* $OpenBSD: c_enc.c,v 1.7 2014/10/28 07:35:58 jsg Exp $ */
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
62 #ifndef OPENBSD_CAST_ASM
CAST_encrypt(CAST_LONG * data,const CAST_KEY * key)63 void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
64 {
65 CAST_LONG l,r,t;
66 const CAST_LONG *k;
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 if(!key->short_key)
85 {
86 E_CAST(12,k,l,r,+,^,-);
87 E_CAST(13,k,r,l,^,-,+);
88 E_CAST(14,k,l,r,-,+,^);
89 E_CAST(15,k,r,l,+,^,-);
90 }
91
92 data[1]=l&0xffffffffL;
93 data[0]=r&0xffffffffL;
94 }
95
CAST_decrypt(CAST_LONG * data,const CAST_KEY * key)96 void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
97 {
98 CAST_LONG l,r,t;
99 const CAST_LONG *k;
100
101 k= &(key->data[0]);
102 l=data[0];
103 r=data[1];
104
105 if(!key->short_key)
106 {
107 E_CAST(15,k,l,r,+,^,-);
108 E_CAST(14,k,r,l,-,+,^);
109 E_CAST(13,k,l,r,^,-,+);
110 E_CAST(12,k,r,l,+,^,-);
111 }
112 E_CAST(11,k,l,r,-,+,^);
113 E_CAST(10,k,r,l,^,-,+);
114 E_CAST( 9,k,l,r,+,^,-);
115 E_CAST( 8,k,r,l,-,+,^);
116 E_CAST( 7,k,l,r,^,-,+);
117 E_CAST( 6,k,r,l,+,^,-);
118 E_CAST( 5,k,l,r,-,+,^);
119 E_CAST( 4,k,r,l,^,-,+);
120 E_CAST( 3,k,l,r,+,^,-);
121 E_CAST( 2,k,r,l,-,+,^);
122 E_CAST( 1,k,l,r,^,-,+);
123 E_CAST( 0,k,r,l,+,^,-);
124
125 data[1]=l&0xffffffffL;
126 data[0]=r&0xffffffffL;
127 }
128 #endif
129
CAST_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,const CAST_KEY * ks,unsigned char * iv,int enc)130 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
131 const CAST_KEY *ks, unsigned char *iv, int enc)
132 {
133 CAST_LONG tin0,tin1;
134 CAST_LONG tout0,tout1,xor0,xor1;
135 long l=length;
136 CAST_LONG tin[2];
137
138 if (enc)
139 {
140 n2l(iv,tout0);
141 n2l(iv,tout1);
142 iv-=8;
143 for (l-=8; l>=0; l-=8)
144 {
145 n2l(in,tin0);
146 n2l(in,tin1);
147 tin0^=tout0;
148 tin1^=tout1;
149 tin[0]=tin0;
150 tin[1]=tin1;
151 CAST_encrypt(tin,ks);
152 tout0=tin[0];
153 tout1=tin[1];
154 l2n(tout0,out);
155 l2n(tout1,out);
156 }
157 if (l != -8)
158 {
159 n2ln(in,tin0,tin1,l+8);
160 tin0^=tout0;
161 tin1^=tout1;
162 tin[0]=tin0;
163 tin[1]=tin1;
164 CAST_encrypt(tin,ks);
165 tout0=tin[0];
166 tout1=tin[1];
167 l2n(tout0,out);
168 l2n(tout1,out);
169 }
170 l2n(tout0,iv);
171 l2n(tout1,iv);
172 }
173 else
174 {
175 n2l(iv,xor0);
176 n2l(iv,xor1);
177 iv-=8;
178 for (l-=8; l>=0; l-=8)
179 {
180 n2l(in,tin0);
181 n2l(in,tin1);
182 tin[0]=tin0;
183 tin[1]=tin1;
184 CAST_decrypt(tin,ks);
185 tout0=tin[0]^xor0;
186 tout1=tin[1]^xor1;
187 l2n(tout0,out);
188 l2n(tout1,out);
189 xor0=tin0;
190 xor1=tin1;
191 }
192 if (l != -8)
193 {
194 n2l(in,tin0);
195 n2l(in,tin1);
196 tin[0]=tin0;
197 tin[1]=tin1;
198 CAST_decrypt(tin,ks);
199 tout0=tin[0]^xor0;
200 tout1=tin[1]^xor1;
201 l2nn(tout0,tout1,out,l+8);
202 xor0=tin0;
203 xor1=tin1;
204 }
205 l2n(xor0,iv);
206 l2n(xor1,iv);
207 }
208 tin0=tin1=tout0=tout1=xor0=xor1=0;
209 tin[0]=tin[1]=0;
210 }
211