1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 2015 - 2019, Steve Holme, <steve_holme@hotmail.com>. |
9 | * |
10 | * This software is licensed as described in the file COPYING, which |
11 | * you should have received as part of this distribution. The terms |
12 | * are also available at https://curl.haxx.se/docs/copyright.html. |
13 | * |
14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
15 | * copies of the Software, and permit persons to whom the Software is |
16 | * furnished to do so, under the terms of the COPYING file. |
17 | * |
18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
19 | * KIND, either express or implied. |
20 | * |
21 | ***************************************************************************/ |
22 | |
23 | #include "curl_setup.h" |
24 | |
25 | #if defined(USE_NTLM) && !defined(USE_OPENSSL) |
26 | |
27 | #include "curl_des.h" |
28 | |
29 | /* |
30 | * Curl_des_set_odd_parity() |
31 | * |
32 | * This is used to apply odd parity to the given byte array. It is typically |
33 | * used by when a cryptography engines doesn't have it's own version. |
34 | * |
35 | * The function is a port of the Java based oddParity() function over at: |
36 | * |
37 | * https://davenport.sourceforge.io/ntlm.html |
38 | * |
39 | * Parameters: |
40 | * |
41 | * bytes [in/out] - The data whose parity bits are to be adjusted for |
42 | * odd parity. |
43 | * len [out] - The length of the data. |
44 | */ |
45 | void Curl_des_set_odd_parity(unsigned char *bytes, size_t len) |
46 | { |
47 | size_t i; |
48 | |
49 | for(i = 0; i < len; i++) { |
50 | unsigned char b = bytes[i]; |
51 | |
52 | bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^ |
53 | (b >> 4) ^ (b >> 3) ^ (b >> 2) ^ |
54 | (b >> 1)) & 0x01) == 0; |
55 | |
56 | if(needs_parity) |
57 | bytes[i] |= 0x01; |
58 | else |
59 | bytes[i] &= 0xfe; |
60 | } |
61 | } |
62 | |
63 | #endif /* USE_NTLM && !USE_OPENSSL */ |
64 | |