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