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Annotation of embedaddon/curl/lib/curl_des.c, revision 1.1

1.1     ! misho       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 */