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    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 */