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d02b48c6 | 1 | /* crypto/des/qud_cksm.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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 | ||
0f113f3e MC |
59 | /* |
60 | * From "Message Authentication" R.R. Jueneman, S.M. Matyas, C.H. Meyer IEEE | |
61 | * Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40 This module in | |
62 | * only based on the code in this paper and is almost definitely not the same | |
63 | * as the MIT implementation. | |
d02b48c6 RE |
64 | */ |
65 | #include "des_locl.h" | |
66 | ||
67 | /* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */ | |
0f113f3e MC |
68 | #define Q_B0(a) (((DES_LONG)(a))) |
69 | #define Q_B1(a) (((DES_LONG)(a))<<8) | |
70 | #define Q_B2(a) (((DES_LONG)(a))<<16) | |
71 | #define Q_B3(a) (((DES_LONG)(a))<<24) | |
d02b48c6 RE |
72 | |
73 | /* used to scramble things a bit */ | |
74 | /* Got the value MIT uses via brute force :-) 2/10/90 eay */ | |
0f113f3e | 75 | #define NOISE ((DES_LONG)83653421L) |
d02b48c6 | 76 | |
c2e4f17c | 77 | DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[], |
0f113f3e MC |
78 | long length, int out_count, DES_cblock *seed) |
79 | { | |
80 | DES_LONG z0, z1, t0, t1; | |
81 | int i; | |
82 | long l; | |
83 | const unsigned char *cp; | |
84 | DES_LONG *lp; | |
d02b48c6 | 85 | |
0f113f3e MC |
86 | if (out_count < 1) |
87 | out_count = 1; | |
88 | lp = (DES_LONG *)&(output[0])[0]; | |
d02b48c6 | 89 | |
0f113f3e MC |
90 | z0 = Q_B0((*seed)[0]) | Q_B1((*seed)[1]) | Q_B2((*seed)[2]) | |
91 | Q_B3((*seed)[3]); | |
92 | z1 = Q_B0((*seed)[4]) | Q_B1((*seed)[5]) | Q_B2((*seed)[6]) | | |
93 | Q_B3((*seed)[7]); | |
d02b48c6 | 94 | |
0f113f3e MC |
95 | for (i = 0; ((i < 4) && (i < out_count)); i++) { |
96 | cp = input; | |
97 | l = length; | |
98 | while (l > 0) { | |
99 | if (l > 1) { | |
100 | t0 = (DES_LONG)(*(cp++)); | |
101 | t0 |= (DES_LONG)Q_B1(*(cp++)); | |
102 | l--; | |
103 | } else | |
104 | t0 = (DES_LONG)(*(cp++)); | |
105 | l--; | |
106 | /* add */ | |
107 | t0 += z0; | |
108 | t0 &= 0xffffffffL; | |
109 | t1 = z1; | |
110 | /* square, well sort of square */ | |
111 | z0 = ((((t0 * t0) & 0xffffffffL) + ((t1 * t1) & 0xffffffffL)) | |
112 | & 0xffffffffL) % 0x7fffffffL; | |
113 | z1 = ((t0 * ((t1 + NOISE) & 0xffffffffL)) & 0xffffffffL) % | |
114 | 0x7fffffffL; | |
115 | } | |
116 | if (lp != NULL) { | |
117 | /* | |
118 | * The MIT library assumes that the checksum is composed of | |
119 | * 2*out_count 32 bit ints | |
120 | */ | |
121 | *lp++ = z0; | |
122 | *lp++ = z1; | |
123 | } | |
124 | } | |
125 | return (z0); | |
126 | } |