1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 2015 - 2022, 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 https://curl.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 * SPDX-License-Identifier: curl
23 ***************************************************************************/
25 #include "curl_setup.h"
27 #if defined(USE_CURL_NTLM_CORE) && !defined(USE_WOLFSSL) && \
28 (defined(USE_GNUTLS) || \
30 defined(USE_SECTRANSP) || \
31 defined(USE_OS400CRYPTO) || \
32 defined(USE_WIN32_CRYPTO))
37 * Curl_des_set_odd_parity()
39 * This is used to apply odd parity to the given byte array. It is typically
40 * used by when a cryptography engines doesn't have it's own version.
42 * The function is a port of the Java based oddParity() function over at:
44 * https://davenport.sourceforge.net/ntlm.html
48 * bytes [in/out] - The data whose parity bits are to be adjusted for
50 * len [out] - The length of the data.
52 void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
56 for(i = 0; i < len; i++) {
57 unsigned char b = bytes[i];
59 bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
60 (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
61 (b >> 1)) & 0x01) == 0;