[457] | 1 | /*
|
---|
| 2 | * pppcrypt.c - PPP/DES linkage for MS-CHAP and EAP SRP-SHA1
|
---|
| 3 | *
|
---|
| 4 | * Extracted from chap_ms.c by James Carlson.
|
---|
| 5 | *
|
---|
| 6 | * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
|
---|
| 7 | *
|
---|
| 8 | * Redistribution and use in source and binary forms, with or without
|
---|
| 9 | * modification, are permitted provided that the following conditions
|
---|
| 10 | * are met:
|
---|
| 11 | *
|
---|
| 12 | * 1. Redistributions of source code must retain the above copyright
|
---|
| 13 | * notice, this list of conditions and the following disclaimer.
|
---|
| 14 | *
|
---|
| 15 | * 2. Redistributions in binary form must reproduce the above copyright
|
---|
| 16 | * notice, this list of conditions and the following disclaimer in
|
---|
| 17 | * the documentation and/or other materials provided with the
|
---|
| 18 | * distribution.
|
---|
| 19 | *
|
---|
| 20 | * 3. The name(s) of the authors of this software must not be used to
|
---|
| 21 | * endorse or promote products derived from this software without
|
---|
| 22 | * prior written permission.
|
---|
| 23 | *
|
---|
| 24 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
|
---|
| 25 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
---|
| 26 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
|
---|
| 27 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
---|
| 28 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
|
---|
| 29 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
|
---|
| 30 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
---|
| 31 | */
|
---|
| 32 |
|
---|
| 33 | #include "netif/ppp/ppp_opts.h"
|
---|
| 34 | #if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not necessary */
|
---|
| 35 |
|
---|
| 36 | #include "netif/ppp/ppp_impl.h"
|
---|
| 37 |
|
---|
| 38 | #include "netif/ppp/pppcrypt.h"
|
---|
| 39 |
|
---|
| 40 |
|
---|
| 41 | static u_char pppcrypt_get_7bits(u_char *input, int startBit) {
|
---|
| 42 | unsigned int word;
|
---|
| 43 |
|
---|
| 44 | word = (unsigned)input[startBit / 8] << 8;
|
---|
| 45 | word |= (unsigned)input[startBit / 8 + 1];
|
---|
| 46 |
|
---|
| 47 | word >>= 15 - (startBit % 8 + 7);
|
---|
| 48 |
|
---|
| 49 | return word & 0xFE;
|
---|
| 50 | }
|
---|
| 51 |
|
---|
| 52 | /* IN 56 bit DES key missing parity bits
|
---|
| 53 | * OUT 64 bit DES key with parity bits added
|
---|
| 54 | */
|
---|
| 55 | void pppcrypt_56_to_64_bit_key(u_char *key, u_char * des_key) {
|
---|
| 56 | des_key[0] = pppcrypt_get_7bits(key, 0);
|
---|
| 57 | des_key[1] = pppcrypt_get_7bits(key, 7);
|
---|
| 58 | des_key[2] = pppcrypt_get_7bits(key, 14);
|
---|
| 59 | des_key[3] = pppcrypt_get_7bits(key, 21);
|
---|
| 60 | des_key[4] = pppcrypt_get_7bits(key, 28);
|
---|
| 61 | des_key[5] = pppcrypt_get_7bits(key, 35);
|
---|
| 62 | des_key[6] = pppcrypt_get_7bits(key, 42);
|
---|
| 63 | des_key[7] = pppcrypt_get_7bits(key, 49);
|
---|
| 64 | }
|
---|
| 65 |
|
---|
| 66 | #endif /* PPP_SUPPORT && MSCHAP_SUPPORT */
|
---|