1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24 25#include "curl_setup.h" 26 27#if defined(USE_CURL_NTLM_CORE) && !defined(USE_WOLFSSL) && \ 28 (defined(USE_GNUTLS) || \ 29 defined(USE_SECTRANSP) || \ 30 defined(USE_OS400CRYPTO) || \ 31 defined(USE_WIN32_CRYPTO)) 32 33#include "curl_des.h" 34 35/* 36 * Curl_des_set_odd_parity() 37 * 38 * This is used to apply odd parity to the given byte array. It is typically 39 * used by when a cryptography engines doesn't have it's own version. 40 * 41 * The function is a port of the Java based oddParity() function over at: 42 * 43 * https://davenport.sourceforge.net/ntlm.html 44 * 45 * Parameters: 46 * 47 * bytes [in/out] - The data whose parity bits are to be adjusted for 48 * odd parity. 49 * len [out] - The length of the data. 50 */ 51void Curl_des_set_odd_parity(unsigned char *bytes, size_t len) 52{ 53 size_t i; 54 55 for(i = 0; i < len; i++) { 56 unsigned char b = bytes[i]; 57 58 bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^ 59 (b >> 4) ^ (b >> 3) ^ (b >> 2) ^ 60 (b >> 1)) & 0x01) == 0; 61 62 if(needs_parity) 63 bytes[i] |= 0x01; 64 else 65 bytes[i] &= 0xfe; 66 } 67} 68 69#endif 70