64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2015 - 2021, Steve Holme, <steve_holme@hotmail.com>.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if defined(USE_NTLM) && !defined(USE_OPENSSL) && !defined(USE_WOLFSSL)
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#include "curl_des.h"
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/*
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* Curl_des_set_odd_parity()
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*
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* This is used to apply odd parity to the given byte array. It is typically
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* used by when a cryptography engines doesn't have it's own version.
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*
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* The function is a port of the Java based oddParity() function over at:
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*
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* https://davenport.sourceforge.io/ntlm.html
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*
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* Parameters:
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*
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* bytes [in/out] - The data whose parity bits are to be adjusted for
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* odd parity.
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* len [out] - The length of the data.
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*/
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void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
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{
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size_t i;
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for(i = 0; i < len; i++) {
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unsigned char b = bytes[i];
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bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
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(b >> 4) ^ (b >> 3) ^ (b >> 2) ^
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(b >> 1)) & 0x01) == 0;
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if(needs_parity)
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bytes[i] |= 0x01;
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else
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bytes[i] &= 0xfe;
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}
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}
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#endif /* USE_NTLM && !USE_OPENSSL */
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