quickjs-tart

quickjs-based runtime for wallet-core logic
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curl_des.c (2131B)

      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) && \
     28   (defined(USE_GNUTLS) ||          \
     29    defined(USE_OS400CRYPTO) ||     \
     30    defined(USE_WIN32_CRYPTO))
     31 
     32 #include "curl_des.h"
     33 
     34 /*
     35  * Curl_des_set_odd_parity()
     36  *
     37  * This is used to apply odd parity to the given byte array. It is typically
     38  * used by when a cryptography engine does not have its own version.
     39  *
     40  * The function is a port of the Java based oddParity() function over at:
     41  *
     42  * https://davenport.sourceforge.net/ntlm.html
     43  *
     44  * Parameters:
     45  *
     46  * bytes       [in/out] - The data whose parity bits are to be adjusted for
     47  *                        odd parity.
     48  * len         [out]    - The length of the data.
     49  */
     50 void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
     51 {
     52   size_t i;
     53 
     54   for(i = 0; i < len; i++) {
     55     unsigned char b = bytes[i];
     56 
     57     bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
     58                           (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
     59                           (b >> 1)) & 0x01) == 0;
     60 
     61     if(needs_parity)
     62       bytes[i] |= 0x01;
     63     else
     64       bytes[i] &= 0xfe;
     65   }
     66 }
     67 
     68 #endif