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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 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)%0x7ffffff
fL; | |
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 | |
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