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4f22f405 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
4f22f405 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include "des_locl.h" | |
11 | ||
c2e4f17c | 12 | DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output, |
0f113f3e MC |
13 | long length, DES_key_schedule *schedule, |
14 | const_DES_cblock *ivec) | |
15 | { | |
16 | register DES_LONG tout0, tout1, tin0, tin1; | |
17 | register long l = length; | |
18 | DES_LONG tin[2]; | |
19 | unsigned char *out = &(*output)[0]; | |
20 | const unsigned char *iv = &(*ivec)[0]; | |
21 | ||
22 | c2l(iv, tout0); | |
23 | c2l(iv, tout1); | |
24 | for (; l > 0; l -= 8) { | |
25 | if (l >= 8) { | |
26 | c2l(in, tin0); | |
27 | c2l(in, tin1); | |
28 | } else | |
29 | c2ln(in, tin0, tin1, l); | |
d02b48c6 | 30 | |
0f113f3e MC |
31 | tin0 ^= tout0; |
32 | tin[0] = tin0; | |
33 | tin1 ^= tout1; | |
34 | tin[1] = tin1; | |
35 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); | |
36 | /* fix 15/10/91 eay - thanks to keithr@sco.COM */ | |
37 | tout0 = tin[0]; | |
38 | tout1 = tin[1]; | |
39 | } | |
40 | if (out != NULL) { | |
41 | l2c(tout0, out); | |
42 | l2c(tout1, out); | |
43 | } | |
44 | tout0 = tin0 = tin1 = tin[0] = tin[1] = 0; | |
45 | /* | |
46 | * Transform the data in tout1 so that it will match the return value | |
47 | * that the MIT Kerberos mit_des_cbc_cksum API returns. | |
48 | */ | |
49 | tout1 = ((tout1 >> 24L) & 0x000000FF) | |
50 | | ((tout1 >> 8L) & 0x0000FF00) | |
51 | | ((tout1 << 8L) & 0x00FF0000) | |
52 | | ((tout1 << 24L) & 0xFF000000); | |
53 | return (tout1); | |
54 | } |