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
76 DES_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 }