diff options
Diffstat (limited to 'lwip/src/netif/ppp/pppcrypt.c')
| -rw-r--r-- | lwip/src/netif/ppp/pppcrypt.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/lwip/src/netif/ppp/pppcrypt.c b/lwip/src/netif/ppp/pppcrypt.c new file mode 100644 index 0000000..82d78c1 --- /dev/null +++ b/lwip/src/netif/ppp/pppcrypt.c @@ -0,0 +1,66 @@ +/* + * 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 "netif/ppp/ppp_opts.h" +#if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not necessary */ + +#include "netif/ppp/ppp_impl.h" + +#include "netif/ppp/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 */ |