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/*
* Copyright (C) 2008, 2010 Free Software Foundation, Inc.
*
* Author: Simon Josefsson
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* Functions to support draft-ietf-netconf-tls-01.txt. */
#include <gnutls_int.h>
#include <gnutls_hash_int.h>
#include <gnutls_errors.h>
#ifdef ENABLE_PSK
/**
* gnutls_psk_netconf_derive_key:
* @password: zero terminated string containing password.
* @psk_identity: zero terminated string with PSK identity.
* @psk_identity_hint: zero terminated string with PSK identity hint.
* @output_key: output variable, contains newly allocated *data pointer.
*
* This function will derive a PSK key from a password, for use with
* the Netconf protocol.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
*
* Since: 2.4.0
**/
int
gnutls_psk_netconf_derive_key (const char *password,
const char *psk_identity,
const char *psk_identity_hint,
gnutls_datum_t * output_key)
{
const char netconf_key_pad[] = "Key Pad for Netconf";
size_t sha1len = _gnutls_hash_get_algo_len (GNUTLS_DIG_SHA1);
size_t hintlen = strlen (psk_identity_hint);
digest_hd_st dig;
char *inner;
size_t innerlen;
int rc;
/*
* PSK = SHA-1(SHA-1(psk_identity + "Key Pad for Netconf" + password) +
* psk_identity_hint)
*
*/
rc = _gnutls_hash_init (&dig, GNUTLS_DIG_SHA1);
if (rc < 0)
{
gnutls_assert ();
return rc;
}
rc = _gnutls_hash (&dig, psk_identity, strlen (psk_identity));
if (rc < 0)
{
gnutls_assert ();
_gnutls_hash_deinit (&dig, NULL);
return rc;
}
rc = _gnutls_hash (&dig, netconf_key_pad, strlen (netconf_key_pad));
if (rc < 0)
{
gnutls_assert ();
_gnutls_hash_deinit (&dig, NULL);
return rc;
}
rc = _gnutls_hash (&dig, password, strlen (password));
if (rc < 0)
{
gnutls_assert ();
_gnutls_hash_deinit (&dig, NULL);
return rc;
}
innerlen = sha1len + hintlen;
inner = gnutls_malloc (innerlen);
_gnutls_hash_deinit (&dig, inner);
if (inner == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
memcpy (inner + sha1len, psk_identity_hint, hintlen);
rc = _gnutls_hash_init (&dig, GNUTLS_DIG_SHA1);
if (rc < 0)
{
gnutls_assert ();
gnutls_free (inner);
return rc;
}
rc = _gnutls_hash (&dig, inner, innerlen);
gnutls_free (inner);
if (rc < 0)
{
gnutls_assert ();
_gnutls_hash_deinit (&dig, NULL);
return rc;
}
output_key->data = gnutls_malloc (sha1len);
_gnutls_hash_deinit (&dig, output_key->data);
if (output_key->data == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
output_key->size = sha1len;
return 0;
}
#endif /* ENABLE_PSK */
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