xref: /netbsd/sys/crypto/blowfish/bf_cbc.c (revision 6550d01e)
1 /*	$NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $	*/
2 
3 /* crypto/bf/bf_cbc.c */
4 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5  * All rights reserved.
6  *
7  * This package is an SSL implementation written
8  * by Eric Young (eay@cryptsoft.com).
9  * The implementation was written so as to conform with Netscapes SSL.
10  *
11  * This library is free for commercial and non-commercial use as long as
12  * the following conditions are aheared to.  The following conditions
13  * apply to all code found in this distribution, be it the RC4, RSA,
14  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
15  * included with this distribution is covered by the same copyright terms
16  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
17  *
18  * Copyright remains Eric Young's, and as such any Copyright notices in
19  * the code are not to be removed.
20  * If this package is used in a product, Eric Young should be given attribution
21  * as the author of the parts of the library used.
22  * This can be in the form of a textual message at program startup or
23  * in documentation (online or textual) provided with the package.
24  *
25  * Redistribution and use in source and binary forms, with or without
26  * modification, are permitted provided that the following conditions
27  * are met:
28  * 1. Redistributions of source code must retain the copyright
29  *    notice, this list of conditions and the following disclaimer.
30  * 2. Redistributions in binary form must reproduce the above copyright
31  *    notice, this list of conditions and the following disclaimer in the
32  *    documentation and/or other materials provided with the distribution.
33  * 3. All advertising materials mentioning features or use of this software
34  *    must display the following acknowledgement:
35  *    "This product includes cryptographic software written by
36  *     Eric Young (eay@cryptsoft.com)"
37  *    The word 'cryptographic' can be left out if the rouines from the library
38  *    being used are not cryptographic related :-).
39  * 4. If you include any Windows specific code (or a derivative thereof) from
40  *    the apps directory (application code) you must include an acknowledgement:
41  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
42  *
43  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53  * SUCH DAMAGE.
54  *
55  * The licence and distribution terms for any publically available version or
56  * derivative of this code cannot be changed.  i.e. this code cannot simply be
57  * copied and put under another distribution licence
58  * [including the GNU Public Licence.]
59  */
60 
61 #include <sys/cdefs.h>
62 __KERNEL_RCSID(0, "$NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $");
63 
64 #include <sys/types.h>
65 
66 #include <crypto/blowfish/blowfish.h>
67 #include "bf_locl.h"
68 
69 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
70 	     const BF_KEY *schedule, unsigned char *ivec, int encrypt)
71 	{
72 	register BF_LONG tin0,tin1;
73 	register BF_LONG tout0,tout1,xor0,xor1;
74 	register long l=length;
75 	BF_LONG tin[2];
76 
77 	if (encrypt)
78 		{
79 		n2l(ivec,tout0);
80 		n2l(ivec,tout1);
81 		ivec-=8;
82 		for (l-=8; l>=0; l-=8)
83 			{
84 			n2l(in,tin0);
85 			n2l(in,tin1);
86 			tin0^=tout0;
87 			tin1^=tout1;
88 			tin[0]=tin0;
89 			tin[1]=tin1;
90 			BF_encrypt(tin,(const BF_KEY *)schedule);
91 			tout0=tin[0];
92 			tout1=tin[1];
93 			l2n(tout0,out);
94 			l2n(tout1,out);
95 			}
96 		if (l != -8)
97 			{
98 			n2ln(in,tin0,tin1,l+8);
99 			tin0^=tout0;
100 			tin1^=tout1;
101 			tin[0]=tin0;
102 			tin[1]=tin1;
103 			BF_encrypt(tin,(const BF_KEY *)schedule);
104 			tout0=tin[0];
105 			tout1=tin[1];
106 			l2n(tout0,out);
107 			l2n(tout1,out);
108 			}
109 		l2n(tout0,ivec);
110 		l2n(tout1,ivec);
111 		}
112 	else
113 		{
114 		n2l(ivec,xor0);
115 		n2l(ivec,xor1);
116 		ivec-=8;
117 		for (l-=8; l>=0; l-=8)
118 			{
119 			n2l(in,tin0);
120 			n2l(in,tin1);
121 			tin[0]=tin0;
122 			tin[1]=tin1;
123 			BF_decrypt(tin,(const BF_KEY *)schedule);
124 			tout0=tin[0]^xor0;
125 			tout1=tin[1]^xor1;
126 			l2n(tout0,out);
127 			l2n(tout1,out);
128 			xor0=tin0;
129 			xor1=tin1;
130 			}
131 		if (l != -8)
132 			{
133 			n2l(in,tin0);
134 			n2l(in,tin1);
135 			tin[0]=tin0;
136 			tin[1]=tin1;
137 			BF_decrypt(tin,(const BF_KEY *)schedule);
138 			tout0=tin[0]^xor0;
139 			tout1=tin[1]^xor1;
140 			l2nn(tout0,tout1,out,l+8);
141 			xor0=tin0;
142 			xor1=tin1;
143 			}
144 		l2n(xor0,ivec);
145 		l2n(xor1,ivec);
146 		}
147 	tin0=tin1=tout0=tout1=xor0=xor1=0;
148 	tin[0]=tin[1]=0;
149 	}
150 
151