67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
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/*
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* pppcrypt.c - PPP/DES linkage for MS-CHAP and EAP SRP-SHA1
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*
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* Extracted from chap_ms.c by James Carlson.
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*
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* Copyright (c) 1995 Eric Rosenquist. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The name(s) of the authors of this software must not be used to
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* endorse or promote products derived from this software without
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* prior written permission.
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*
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* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "lwip/opt.h"
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#if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not necessary */
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#include "netif/ppp/ppp_impl.h"
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#include "netif/ppp/pppcrypt.h"
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static u_char pppcrypt_get_7bits(u_char *input, int startBit) {
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unsigned int word;
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word = (unsigned)input[startBit / 8] << 8;
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word |= (unsigned)input[startBit / 8 + 1];
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word >>= 15 - (startBit % 8 + 7);
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return word & 0xFE;
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}
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/* IN 56 bit DES key missing parity bits
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* OUT 64 bit DES key with parity bits added
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*/
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void pppcrypt_56_to_64_bit_key(u_char *key, u_char * des_key) {
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des_key[0] = pppcrypt_get_7bits(key, 0);
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des_key[1] = pppcrypt_get_7bits(key, 7);
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des_key[2] = pppcrypt_get_7bits(key, 14);
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des_key[3] = pppcrypt_get_7bits(key, 21);
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des_key[4] = pppcrypt_get_7bits(key, 28);
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des_key[5] = pppcrypt_get_7bits(key, 35);
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des_key[6] = pppcrypt_get_7bits(key, 42);
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des_key[7] = pppcrypt_get_7bits(key, 49);
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}
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#endif /* PPP_SUPPORT && MSCHAP_SUPPORT */
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