| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 2015, Steve Holme, <[email protected]>.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #if defined(USE_NTLM) && !defined(USE_OPENSSL)
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| 26 |
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| 27 | #include "curl_des.h"
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| 28 |
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| 29 | /*
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| 30 | * Curl_des_set_odd_parity()
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| 31 | *
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| 32 | * This is used to apply odd parity to the given byte array. It is typically
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| 33 | * used by when a cryptography engines doesn't have it's own version.
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| 34 | *
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| 35 | * The function is a port of the Java based oddParity() function over at:
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| 36 | *
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| 37 | * https://davenport.sourceforge.io/ntlm.html
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| 38 | *
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| 39 | * Parameters:
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| 40 | *
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| 41 | * bytes [in/out] - The data whose parity bits are to be adjusted for
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| 42 | * odd parity.
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| 43 | * len [out] - The length of the data.
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| 44 | */
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| 45 | void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
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| 46 | {
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| 47 | size_t i;
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| 48 |
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| 49 | for(i = 0; i < len; i++) {
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| 50 | unsigned char b = bytes[i];
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| 51 |
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| 52 | bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
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| 53 | (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
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| 54 | (b >> 1)) & 0x01) == 0;
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| 55 |
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| 56 | if(needs_parity)
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| 57 | bytes[i] |= 0x01;
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| 58 | else
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| 59 | bytes[i] &= 0xfe;
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | #endif /* USE_NTLM && !USE_OPENSSL */
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