1/* crypto/des/qud_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/* From "Message Authentication"  R.R. Jueneman, S.M. Matyas, C.H. Meyer
60 * IEEE Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40
61 * This module in only based on the code in this paper and is
62 * almost definitely not the same as the MIT implementation.
63 */
64#include "des_locl.h"
65
66/* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */
67#define Q_B0(a)	(((DES_LONG)(a)))
68#define Q_B1(a)	(((DES_LONG)(a))<<8)
69#define Q_B2(a)	(((DES_LONG)(a))<<16)
70#define Q_B3(a)	(((DES_LONG)(a))<<24)
71
72/* used to scramble things a bit */
73/* Got the value MIT uses via brute force :-) 2/10/90 eay */
74#define NOISE	((DES_LONG)83653421L)
75
76DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
77	     long length, int out_count, DES_cblock *seed)
78	{
79	DES_LONG z0,z1,t0,t1;
80	int i;
81	long l;
82	const unsigned char *cp;
83#ifdef _CRAY
84	struct lp_st { int a:32; int b:32; } *lp;
85#else
86	DES_LONG *lp;
87#endif
88
89	if (out_count < 1) out_count=1;
90#ifdef _CRAY
91	lp = (struct lp_st *) &(output[0])[0];
92#else
93	lp = (DES_LONG *) &(output[0])[0];
94#endif
95
96	z0=Q_B0((*seed)[0])|Q_B1((*seed)[1])|Q_B2((*seed)[2])|Q_B3((*seed)[3]);
97	z1=Q_B0((*seed)[4])|Q_B1((*seed)[5])|Q_B2((*seed)[6])|Q_B3((*seed)[7]);
98
99	for (i=0; ((i<4)&&(i<out_count)); i++)
100		{
101		cp=input;
102		l=length;
103		while (l > 0)
104			{
105			if (l > 1)
106				{
107				t0= (DES_LONG)(*(cp++));
108				t0|=(DES_LONG)Q_B1(*(cp++));
109				l--;
110				}
111			else
112				t0= (DES_LONG)(*(cp++));
113			l--;
114			/* add */
115			t0+=z0;
116			t0&=0xffffffffL;
117			t1=z1;
118			/* square, well sort of square */
119			z0=((((t0*t0)&0xffffffffL)+((t1*t1)&0xffffffffL))
120				&0xffffffffL)%0x7fffffffL;
121			z1=((t0*((t1+NOISE)&0xffffffffL))&0xffffffffL)%0x7fffffffL;
122			}
123		if (lp != NULL)
124			{
125			/* The MIT library assumes that the checksum is
126			 * composed of 2*out_count 32 bit ints */
127#ifdef _CRAY
128			(*lp).a = z0;
129			(*lp).b = z1;
130			lp++;
131#else
132			*lp++ = z0;
133			*lp++ = z1;
134#endif
135			}
136		}
137	return(z0);
138	}
139
140