| 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) 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.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 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #if defined(USE_CURL_NTLM_CORE) && !defined(USE_WOLFSSL) && \
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| 28 | (defined(USE_GNUTLS) || \
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| 29 | defined(USE_SECTRANSP) || \
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| 30 | defined(USE_OS400CRYPTO) || \
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| 31 | defined(USE_WIN32_CRYPTO))
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| 32 |
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| 33 | #include "curl_des.h"
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| 34 |
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| 35 | /*
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| 36 | * Curl_des_set_odd_parity()
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| 37 | *
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| 38 | * This is used to apply odd parity to the given byte array. It is typically
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| 39 | * used by when a cryptography engines doesn't have it's own version.
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| 40 | *
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| 41 | * The function is a port of the Java based oddParity() function over at:
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| 42 | *
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| 43 | * https://davenport.sourceforge.net/ntlm.html
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| 44 | *
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| 45 | * Parameters:
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| 46 | *
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| 47 | * bytes [in/out] - The data whose parity bits are to be adjusted for
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| 48 | * odd parity.
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| 49 | * len [out] - The length of the data.
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| 50 | */
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| 51 | void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
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| 52 | {
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| 53 | size_t i;
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| 54 |
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| 55 | for(i = 0; i < len; i++) {
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| 56 | unsigned char b = bytes[i];
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| 57 |
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| 58 | bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
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| 59 | (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
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| 60 | (b >> 1)) & 0x01) == 0;
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| 61 |
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| 62 | if(needs_parity)
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| 63 | bytes[i] |= 0x01;
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| 64 | else
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| 65 | bytes[i] &= 0xfe;
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | #endif
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