1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 2015, Steve Holme, <steve_holme@hotmail.com>.
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 http://curl.haxx.se/docs/copyright.html.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 #include "curl_setup.h"
25 #if defined(USE_NTLM) && (!defined(USE_OPENSSL) || defined(HAVE_BORINGSSL))
30 * Curl_des_set_odd_parity()
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.
35 * The function is a port of the Java based oddParity() function over at:
37 * http://davenport.sourceforge.net/ntlm.html
41 * bytes [in/out] - The data whose parity bits are to be adjusted for
43 * len [out] - The length of the data.
45 void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
49 for(i = 0; i < len; i++) {
50 unsigned char b = bytes[i];
52 bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
53 (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
54 (b >> 1)) & 0x01) == 0;
63 #endif /* USE_NTLM && (!USE_OPENSSL || HAVE_BORINGSSL) */