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/*
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., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2004-2005
ssl calls
*/
#include "os_calls.h"
#include <openssl/rc4.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <openssl/bn.h>
/* rc4 stuff */
/*****************************************************************************/
void*
g_rc4_info_create(void)
{
return g_malloc(sizeof(RC4_KEY), 1);;
}
/*****************************************************************************/
void
g_rc4_info_delete(void* rc4_info)
{
g_free(rc4_info);
}
/*****************************************************************************/
void
g_rc4_set_key(void* rc4_info, char* key, int len)
{
RC4_set_key((RC4_KEY*)rc4_info, len, (unsigned char*)key);
}
/*****************************************************************************/
void
g_rc4_crypt(void* rc4_info, char* data, int len)
{
RC4((RC4_KEY*)rc4_info, len, (unsigned char*)data, (unsigned char*)data);
}
/* sha1 stuff */
/*****************************************************************************/
void*
g_sha1_info_create(void)
{
return g_malloc(sizeof(SHA_CTX), 1);
}
/*****************************************************************************/
void
g_sha1_info_delete(void* sha1_info)
{
g_free(sha1_info);
}
/*****************************************************************************/
void
g_sha1_clear(void* sha1_info)
{
SHA1_Init((SHA_CTX*)sha1_info);
}
/*****************************************************************************/
void
g_sha1_transform(void* sha1_info, char* data, int len)
{
SHA1_Update((SHA_CTX*)sha1_info, data, len);
}
/*****************************************************************************/
void
g_sha1_complete(void* sha1_info, char* data)
{
SHA1_Final((unsigned char*)data, (SHA_CTX*)sha1_info);
}
/* md5 stuff */
/*****************************************************************************/
void*
g_md5_info_create(void)
{
return g_malloc(sizeof(MD5_CTX), 1);
}
/*****************************************************************************/
void
g_md5_info_delete(void* md5_info)
{
g_free(md5_info);
}
/*****************************************************************************/
void
g_md5_clear(void* md5_info)
{
MD5_Init((MD5_CTX*)md5_info);
}
/*****************************************************************************/
void
g_md5_transform(void* md5_info, char* data, int len)
{
MD5_Update((MD5_CTX*)md5_info, data, len);
}
/*****************************************************************************/
void
g_md5_complete(void* md5_info, char* data)
{
MD5_Final((unsigned char*)data, (MD5_CTX*)md5_info);
}
/*****************************************************************************/
static void
reverse_it(char* p, int len)
{
int i;
int j;
char temp;
i = 0;
j = len - 1;
while (i < j)
{
temp = p[i];
p[i] = p[j];
p[j] = temp;
i++;
j--;
}
}
/*****************************************************************************/
int
g_mod_exp(char* out, int out_len, char* in, int in_len,
char* mod, int mod_len, char* exp, int exp_len)
{
BN_CTX* ctx;
BIGNUM lmod;
BIGNUM lexp;
BIGNUM lin;
BIGNUM lout;
int rv;
char* l_out;
char* l_in;
char* l_mod;
char* l_exp;
l_out = (char*)g_malloc(out_len, 1);
l_in = (char*)g_malloc(in_len, 1);
l_mod = (char*)g_malloc(mod_len, 1);
l_exp = (char*)g_malloc(exp_len, 1);
g_memcpy(l_in, in, in_len);
g_memcpy(l_mod, mod, mod_len);
g_memcpy(l_exp, exp, exp_len);
reverse_it(l_in, in_len);
reverse_it(l_mod, mod_len);
reverse_it(l_exp, exp_len);
ctx = BN_CTX_new();
BN_init(&lmod);
BN_init(&lexp);
BN_init(&lin);
BN_init(&lout);
BN_bin2bn((unsigned char*)l_mod, mod_len, &lmod);
BN_bin2bn((unsigned char*)l_exp, exp_len, &lexp);
BN_bin2bn((unsigned char*)l_in, in_len, &lin);
BN_mod_exp(&lout, &lin, &lexp, &lmod, ctx);
rv = BN_bn2bin(&lout, (unsigned char*)l_out);
if (rv <= out_len)
{
reverse_it(l_out, rv);
g_memcpy(out, l_out, out_len);
}
else
{
rv = 0;
}
BN_free(&lin);
BN_free(&lout);
BN_free(&lexp);
BN_free(&lmod);
BN_CTX_free(ctx);
g_free(l_out);
g_free(l_in);
g_free(l_mod);
g_free(l_exp);
return rv;
}
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