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/*
Unix SMB/CIFS implementation.
Wrapper for gnutls hash and encryption functions
Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009-2019
Copyright (c) Andreas Schneider <asn@samba.org> 2019
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* This (arcfour over data with a key combined from two inputs, one
* the key another the confounder), is a common pattern in pre-AES
* windows cryptography
*
* Some protocols put the confounder first, others second so both
* parameters are named key_input here.
*
*/
#include "includes.h"
#include "lib/util/data_blob.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include "gnutls_helpers.h"
#include "lib/util/memory.h"
int samba_gnutls_arcfour_confounded_md5(const DATA_BLOB *key_input1,
const DATA_BLOB *key_input2,
DATA_BLOB *data,
enum samba_gnutls_direction encrypt)
{
int rc;
gnutls_hash_hd_t hash_hnd = NULL;
uint8_t confounded_key[16];
gnutls_cipher_hd_t cipher_hnd = NULL;
gnutls_datum_t confounded_key_datum = {
.data = confounded_key,
.size = sizeof(confounded_key),
};
rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
if (rc < 0) {
return rc;
}
rc = gnutls_hash(hash_hnd, key_input1->data, key_input1->length);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return rc;
}
rc = gnutls_hash(hash_hnd, key_input2->data, key_input2->length);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return rc;
}
gnutls_hash_deinit(hash_hnd, confounded_key);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_ARCFOUR_128,
&confounded_key_datum,
NULL);
if (rc < 0) {
return rc;
}
if (encrypt == SAMBA_GNUTLS_ENCRYPT) {
rc = gnutls_cipher_encrypt(cipher_hnd,
data->data,
data->length);
} else {
rc = gnutls_cipher_decrypt(cipher_hnd,
data->data,
data->length);
}
gnutls_cipher_deinit(cipher_hnd);
ZERO_ARRAY(confounded_key);
return rc;
}
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