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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 : 1 : 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 [ - + ]: 1 : if (out_count < 1) out_count=1;
90 : : #ifdef _CRAY
91 : : lp = (struct lp_st *) &(output[0])[0];
92 : : #else
93 : 1 : lp = (DES_LONG *) &(output[0])[0];
94 : : #endif
95 : :
96 : 1 : z0=Q_B0((*seed)[0])|Q_B1((*seed)[1])|Q_B2((*seed)[2])|Q_B3((*seed)[3]);
97 : 1 : z1=Q_B0((*seed)[4])|Q_B1((*seed)[5])|Q_B2((*seed)[6])|Q_B3((*seed)[7]);
98 : :
99 [ + + ]: 3 : for (i=0; ((i<4)&&(i<out_count)); i++)
100 : : {
101 : : cp=input;
102 : : l=length;
103 [ + + ]: 30 : while (l > 0)
104 : : {
105 [ + - ]: 28 : if (l > 1)
106 : : {
107 : 28 : t0= (DES_LONG)(*(cp++));
108 : 28 : t0|=(DES_LONG)Q_B1(*(cp++));
109 : 28 : l--;
110 : : }
111 : : else
112 : 0 : t0= (DES_LONG)(*(cp++));
113 : 28 : l--;
114 : : /* add */
115 : 28 : t0+=z0;
116 : 28 : t0&=0xffffffffL;
117 : 28 : t1=z1;
118 : : /* square, well sort of square */
119 : 56 : z0=((((t0*t0)&0xffffffffL)+((t1*t1)&0xffffffffL))
120 : 28 : &0xffffffffL)%0x7fffffffL;
121 : 28 : z1=((t0*((t1+NOISE)&0xffffffffL))&0xffffffffL)%0x7fffffffL;
122 : : }
123 [ + - ]: 2 : 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 : 2 : *lp++ = z0;
133 : 2 : *lp++ = z1;
134 : : #endif
135 : : }
136 : : }
137 : 1 : return(z0);
138 : : }
139 : :
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