1 /* crypto/cast/c_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 #include <openssl/cast.h>
62 void CAST_encrypt(CAST_LONG
*data
, const CAST_KEY
*key
)
64 register CAST_LONG l
,r
,t
;
65 const register CAST_LONG
*k
;
71 E_CAST( 0,k
,l
,r
,+,^,-);
72 E_CAST( 1,k
,r
,l
,^,-,+);
73 E_CAST( 2,k
,l
,r
,-,+,^);
74 E_CAST( 3,k
,r
,l
,+,^,-);
75 E_CAST( 4,k
,l
,r
,^,-,+);
76 E_CAST( 5,k
,r
,l
,-,+,^);
77 E_CAST( 6,k
,l
,r
,+,^,-);
78 E_CAST( 7,k
,r
,l
,^,-,+);
79 E_CAST( 8,k
,l
,r
,-,+,^);
80 E_CAST( 9,k
,r
,l
,+,^,-);
81 E_CAST(10,k
,l
,r
,^,-,+);
82 E_CAST(11,k
,r
,l
,-,+,^);
85 E_CAST(12,k
,l
,r
,+,^,-);
86 E_CAST(13,k
,r
,l
,^,-,+);
87 E_CAST(14,k
,l
,r
,-,+,^);
88 E_CAST(15,k
,r
,l
,+,^,-);
91 data
[1]=l
&0xffffffffL
;
92 data
[0]=r
&0xffffffffL
;
95 void CAST_decrypt(CAST_LONG
*data
, const CAST_KEY
*key
)
97 register CAST_LONG l
,r
,t
;
98 const register CAST_LONG
*k
;
106 E_CAST(15,k
,l
,r
,+,^,-);
107 E_CAST(14,k
,r
,l
,-,+,^);
108 E_CAST(13,k
,l
,r
,^,-,+);
109 E_CAST(12,k
,r
,l
,+,^,-);
111 E_CAST(11,k
,l
,r
,-,+,^);
112 E_CAST(10,k
,r
,l
,^,-,+);
113 E_CAST( 9,k
,l
,r
,+,^,-);
114 E_CAST( 8,k
,r
,l
,-,+,^);
115 E_CAST( 7,k
,l
,r
,^,-,+);
116 E_CAST( 6,k
,r
,l
,+,^,-);
117 E_CAST( 5,k
,l
,r
,-,+,^);
118 E_CAST( 4,k
,r
,l
,^,-,+);
119 E_CAST( 3,k
,l
,r
,+,^,-);
120 E_CAST( 2,k
,r
,l
,-,+,^);
121 E_CAST( 1,k
,l
,r
,^,-,+);
122 E_CAST( 0,k
,r
,l
,+,^,-);
124 data
[1]=l
&0xffffffffL
;
125 data
[0]=r
&0xffffffffL
;
128 void CAST_cbc_encrypt(const unsigned char *in
, unsigned char *out
, long length
,
129 const CAST_KEY
*ks
, unsigned char *iv
, int enc
)
131 register CAST_LONG tin0
,tin1
;
132 register CAST_LONG tout0
,tout1
,xor0
,xor1
;
133 register long l
=length
;
141 for (l
-=8; l
>=0; l
-=8)
149 CAST_encrypt(tin
,ks
);
157 n2ln(in
,tin0
,tin1
,l
+8);
162 CAST_encrypt(tin
,ks
);
176 for (l
-=8; l
>=0; l
-=8)
182 CAST_decrypt(tin
,ks
);
196 CAST_decrypt(tin
,ks
);
199 l2nn(tout0
,tout1
,out
,l
+8);
206 tin0
=tin1
=tout0
=tout1
=xor0
=xor1
=0;