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1 /* crypto/des/cbc_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 #include "des_locl.h" | |
60 | |
61 DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output, | |
62 long length, DES_key_schedule *schedule, | |
63 const_DES_cblock *ivec) | |
64 { | |
65 register DES_LONG tout0,tout1,tin0,tin1; | |
66 register long l=length; | |
67 DES_LONG tin[2]; | |
68 unsigned char *out = &(*output)[0]; | |
69 const unsigned char *iv = &(*ivec)[0]; | |
70 | |
71 c2l(iv,tout0); | |
72 c2l(iv,tout1); | |
73 for (; l>0; l-=8) | |
74 { | |
75 if (l >= 8) | |
76 { | |
77 c2l(in,tin0); | |
78 c2l(in,tin1); | |
79 } | |
80 else | |
81 c2ln(in,tin0,tin1,l); | |
82 | |
83 tin0^=tout0; tin[0]=tin0; | |
84 tin1^=tout1; tin[1]=tin1; | |
85 DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT); | |
86 /* fix 15/10/91 eay - thanks to keithr@sco.COM */ | |
87 tout0=tin[0]; | |
88 tout1=tin[1]; | |
89 } | |
90 if (out != NULL) | |
91 { | |
92 l2c(tout0,out); | |
93 l2c(tout1,out); | |
94 } | |
95 tout0=tin0=tin1=tin[0]=tin[1]=0; | |
96 /* | |
97 Transform the data in tout1 so that it will | |
98 match the return value that the MIT Kerberos | |
99 mit_des_cbc_cksum API returns. | |
100 */ | |
101 tout1 = ((tout1 >> 24L) & 0x000000FF) | |
102 | ((tout1 >> 8L) & 0x0000FF00) | |
103 | ((tout1 << 8L) & 0x00FF0000) | |
104 | ((tout1 << 24L) & 0xFF000000); | |
105 return(tout1); | |
106 } | |
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