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1 /* crypto/des/cbc_cksm.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 "des_locl.h"
60 
DES_cbc_cksum(const unsigned char * in,DES_cblock * output,long length,DES_key_schedule * schedule,const_DES_cblock * ivec)61 DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output,
62 		       long length, DES_key_schedule *schedule,
63 		       const_DES_cblock *ivec)
64 	{
65 	register DES_LONG tout0,tout1,tin0,tin1;
66 	register long l=length;
67 	DES_LONG tin[2];
68 	unsigned char *out = &(*output)[0];
69 	const unsigned char *iv = &(*ivec)[0];
70 
71 	c2l(iv,tout0);
72 	c2l(iv,tout1);
73 	for (; l>0; l-=8)
74 		{
75 		if (l >= 8)
76 			{
77 			c2l(in,tin0);
78 			c2l(in,tin1);
79 			}
80 		else
81 			c2ln(in,tin0,tin1,l);
82 
83 		tin0^=tout0; tin[0]=tin0;
84 		tin1^=tout1; tin[1]=tin1;
85 		DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
86 		/* fix 15/10/91 eay - thanks to keithr@sco.COM */
87 		tout0=tin[0];
88 		tout1=tin[1];
89 		}
90 	if (out != NULL)
91 		{
92 		l2c(tout0,out);
93 		l2c(tout1,out);
94 		}
95 	tout0=tin0=tin1=tin[0]=tin[1]=0;
96 	/*
97 	  Transform the data in tout1 so that it will
98 	  match the return value that the MIT Kerberos
99 	  mit_des_cbc_cksum API returns.
100 	*/
101 	tout1 = ((tout1 >> 24L) & 0x000000FF)
102 	      | ((tout1 >> 8L)  & 0x0000FF00)
103 	      | ((tout1 << 8L)  & 0x00FF0000)
104 	      | ((tout1 << 24L) & 0xFF000000);
105 	return(tout1);
106 	}
107