| 1 | /*
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| 2 | * pppcrypt.c - PPP/DES linkage for MS-CHAP and EAP SRP-SHA1
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| 3 | *
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| 4 | * Extracted from chap_ms.c by James Carlson.
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| 5 | *
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| 6 | * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | *
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| 12 | * 1. Redistributions of source code must retain the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer.
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| 14 | *
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in
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| 17 | * the documentation and/or other materials provided with the
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| 18 | * distribution.
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| 19 | *
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| 20 | * 3. The name(s) of the authors of this software must not be used to
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| 21 | * endorse or promote products derived from this software without
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| 22 | * prior written permission.
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| 23 | *
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| 24 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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| 25 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 26 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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| 27 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 28 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 29 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 30 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 31 | */
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| 32 |
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| 33 | #include "netif/ppp/ppp_opts.h"
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| 34 | #if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not necessary */
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| 35 |
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| 36 | #include "netif/ppp/ppp_impl.h"
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| 37 |
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| 38 | #include "netif/ppp/pppcrypt.h"
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| 39 |
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| 40 |
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| 41 | static u_char pppcrypt_get_7bits(u_char *input, int startBit) {
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| 42 | unsigned int word;
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| 43 |
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| 44 | word = (unsigned)input[startBit / 8] << 8;
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| 45 | word |= (unsigned)input[startBit / 8 + 1];
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| 46 |
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| 47 | word >>= 15 - (startBit % 8 + 7);
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| 48 |
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| 49 | return word & 0xFE;
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| 50 | }
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| 51 |
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| 52 | /* IN 56 bit DES key missing parity bits
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| 53 | * OUT 64 bit DES key with parity bits added
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| 54 | */
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| 55 | void pppcrypt_56_to_64_bit_key(u_char *key, u_char * des_key) {
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| 56 | des_key[0] = pppcrypt_get_7bits(key, 0);
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| 57 | des_key[1] = pppcrypt_get_7bits(key, 7);
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| 58 | des_key[2] = pppcrypt_get_7bits(key, 14);
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| 59 | des_key[3] = pppcrypt_get_7bits(key, 21);
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| 60 | des_key[4] = pppcrypt_get_7bits(key, 28);
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| 61 | des_key[5] = pppcrypt_get_7bits(key, 35);
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| 62 | des_key[6] = pppcrypt_get_7bits(key, 42);
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| 63 | des_key[7] = pppcrypt_get_7bits(key, 49);
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| 64 | }
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| 65 |
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| 66 | #endif /* PPP_SUPPORT && MSCHAP_SUPPORT */
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