资源简介
openswan-2.6.50.tar.gz
代码片段和文件信息
/* IPSec VPN client compatible with Cisco equipment.
Copyright (C) 2004-2005 Maurice Massar
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License or
(at your option) any later version.
This program is distributed in the hope that it will be useful
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not write to the Free Software
Foundation Inc. 59 Temple Place Suite 330 Boston MA 02111-1307 USA
$Id: config.c 242 2007-09-09 07:55:21Z Joerg Mayer $
*/
#define _GNU_SOURCE
#include
#include
#include
#include
#include
#include
#include
#include
static int hex2bin_c(unsigned int c)
{
if ((c >= ‘0‘)&&(c <= ‘9‘))
return c - ‘0‘;
if ((c >= ‘A‘)&&(c <= ‘F‘))
return c - ‘A‘ + 10;
if ((c >= ‘a‘)&&(c <= ‘f‘))
return c - ‘a‘ + 10;
return -1;
}
int hex2bin(const char *str char **bin int *len)
{
char *p;
int i l;
if (!bin)
return EINVAL;
for (i = 0; str[i] != ‘\0‘; i++)
if (hex2bin_c(str[i]) == -1)
return EINVAL;
l = i;
if ((l & 1) != 0)
return EINVAL;
l /= 2;
p = malloc(l);
if (p == NULL)
return ENOMEM;
for (i = 0; i < l; i++)
p[i] = hex2bin_c(str[i*2]) << 4 | hex2bin_c(str[i*2+1]);
*bin = p;
if (len)
*len = l;
return 0;
}
int deobfuscate(char *ct int len const char **resp char *reslenp)
{
const char *h1 = ct;
const char *h4 = ct + 20;
const char *enc = ct + 40;
char ht[20] h2[20] h3[20] key[24];
const char *iv = h1;
char *res;
gcry_cipher_hd_t ctx;
int reslen;
if (len < 48)
return -1;
len -= 40;
memcpy(ht h1 20);
ht[19]++;
gcry_md_hash_buffer(GCRY_MD_SHA1 h2 ht 20);
ht[19] += 2;
gcry_md_hash_buffer(GCRY_MD_SHA1 h3 ht 20);
memcpy(key h2 20);
memcpy(key+20 h3 4);
/* who cares about parity anyway? */
gcry_md_hash_buffer(GCRY_MD_SHA1 ht enc len);
if (memcmp(h4 ht 20) != 0)
return -1;
res = malloc(len);
if (res == NULL)
return -1;
gcry_cipher_open(&ctx GCRY_CIPHER_3DES GCRY_CIPHER_MODE_CBC 0);
gcry_cipher_setkey(ctx key 24);
gcry_cipher_setiv(ctx iv 8);
gcry_cipher_decrypt(ctx (unsigned char *)res len (unsigned char *)enc len);
gcry_cipher_close(ctx);
reslen = len - res[len-1];
res[reslen] = ‘\0‘;
if (resp)
*resp = res;
if (reslenp)
*reslenp = reslen;
return 0;
}
/* Decoder for password encoding of Cisco VPN client.
Copyright (C) 2005 Maurice Massar
Thanks to HAL-9000@evilscientists.de for decoding and posting the algorithm!
This program is free software; you can redistribute it and/or mod
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