xref: /aosp_15_r20/external/curl/lib/curl_des.c (revision 6236dae45794135f37c4eb022389c904c8b0090d)
1*6236dae4SAndroid Build Coastguard Worker /***************************************************************************
2*6236dae4SAndroid Build Coastguard Worker  *                                  _   _ ____  _
3*6236dae4SAndroid Build Coastguard Worker  *  Project                     ___| | | |  _ \| |
4*6236dae4SAndroid Build Coastguard Worker  *                             / __| | | | |_) | |
5*6236dae4SAndroid Build Coastguard Worker  *                            | (__| |_| |  _ <| |___
6*6236dae4SAndroid Build Coastguard Worker  *                             \___|\___/|_| \_\_____|
7*6236dae4SAndroid Build Coastguard Worker  *
8*6236dae4SAndroid Build Coastguard Worker  * Copyright (C) Steve Holme, <[email protected]>.
9*6236dae4SAndroid Build Coastguard Worker  *
10*6236dae4SAndroid Build Coastguard Worker  * This software is licensed as described in the file COPYING, which
11*6236dae4SAndroid Build Coastguard Worker  * you should have received as part of this distribution. The terms
12*6236dae4SAndroid Build Coastguard Worker  * are also available at https://curl.se/docs/copyright.html.
13*6236dae4SAndroid Build Coastguard Worker  *
14*6236dae4SAndroid Build Coastguard Worker  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15*6236dae4SAndroid Build Coastguard Worker  * copies of the Software, and permit persons to whom the Software is
16*6236dae4SAndroid Build Coastguard Worker  * furnished to do so, under the terms of the COPYING file.
17*6236dae4SAndroid Build Coastguard Worker  *
18*6236dae4SAndroid Build Coastguard Worker  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19*6236dae4SAndroid Build Coastguard Worker  * KIND, either express or implied.
20*6236dae4SAndroid Build Coastguard Worker  *
21*6236dae4SAndroid Build Coastguard Worker  * SPDX-License-Identifier: curl
22*6236dae4SAndroid Build Coastguard Worker  *
23*6236dae4SAndroid Build Coastguard Worker  ***************************************************************************/
24*6236dae4SAndroid Build Coastguard Worker 
25*6236dae4SAndroid Build Coastguard Worker #include "curl_setup.h"
26*6236dae4SAndroid Build Coastguard Worker 
27*6236dae4SAndroid Build Coastguard Worker #if defined(USE_CURL_NTLM_CORE) && \
28*6236dae4SAndroid Build Coastguard Worker   (defined(USE_GNUTLS) ||          \
29*6236dae4SAndroid Build Coastguard Worker    defined(USE_SECTRANSP) ||       \
30*6236dae4SAndroid Build Coastguard Worker    defined(USE_OS400CRYPTO) ||     \
31*6236dae4SAndroid Build Coastguard Worker    defined(USE_WIN32_CRYPTO))
32*6236dae4SAndroid Build Coastguard Worker 
33*6236dae4SAndroid Build Coastguard Worker #include "curl_des.h"
34*6236dae4SAndroid Build Coastguard Worker 
35*6236dae4SAndroid Build Coastguard Worker /*
36*6236dae4SAndroid Build Coastguard Worker  * Curl_des_set_odd_parity()
37*6236dae4SAndroid Build Coastguard Worker  *
38*6236dae4SAndroid Build Coastguard Worker  * This is used to apply odd parity to the given byte array. It is typically
39*6236dae4SAndroid Build Coastguard Worker  * used by when a cryptography engine does not have its own version.
40*6236dae4SAndroid Build Coastguard Worker  *
41*6236dae4SAndroid Build Coastguard Worker  * The function is a port of the Java based oddParity() function over at:
42*6236dae4SAndroid Build Coastguard Worker  *
43*6236dae4SAndroid Build Coastguard Worker  * https://davenport.sourceforge.net/ntlm.html
44*6236dae4SAndroid Build Coastguard Worker  *
45*6236dae4SAndroid Build Coastguard Worker  * Parameters:
46*6236dae4SAndroid Build Coastguard Worker  *
47*6236dae4SAndroid Build Coastguard Worker  * bytes       [in/out] - The data whose parity bits are to be adjusted for
48*6236dae4SAndroid Build Coastguard Worker  *                        odd parity.
49*6236dae4SAndroid Build Coastguard Worker  * len         [out]    - The length of the data.
50*6236dae4SAndroid Build Coastguard Worker  */
Curl_des_set_odd_parity(unsigned char * bytes,size_t len)51*6236dae4SAndroid Build Coastguard Worker void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
52*6236dae4SAndroid Build Coastguard Worker {
53*6236dae4SAndroid Build Coastguard Worker   size_t i;
54*6236dae4SAndroid Build Coastguard Worker 
55*6236dae4SAndroid Build Coastguard Worker   for(i = 0; i < len; i++) {
56*6236dae4SAndroid Build Coastguard Worker     unsigned char b = bytes[i];
57*6236dae4SAndroid Build Coastguard Worker 
58*6236dae4SAndroid Build Coastguard Worker     bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
59*6236dae4SAndroid Build Coastguard Worker                           (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
60*6236dae4SAndroid Build Coastguard Worker                           (b >> 1)) & 0x01) == 0;
61*6236dae4SAndroid Build Coastguard Worker 
62*6236dae4SAndroid Build Coastguard Worker     if(needs_parity)
63*6236dae4SAndroid Build Coastguard Worker       bytes[i] |= 0x01;
64*6236dae4SAndroid Build Coastguard Worker     else
65*6236dae4SAndroid Build Coastguard Worker       bytes[i] &= 0xfe;
66*6236dae4SAndroid Build Coastguard Worker   }
67*6236dae4SAndroid Build Coastguard Worker }
68*6236dae4SAndroid Build Coastguard Worker 
69*6236dae4SAndroid Build Coastguard Worker #endif
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