_lrotl and _lrotr are defined in MSVC but nowhere else that we know
[openssl.git] / crypto / cast / c_enc.c
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
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
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
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