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/*
* Copyright (C) 2017-2018 Free Software Foundation, Inc.
* Copyright (C) 2018 Red Hat, Inc.
*
* Author: Ander Juaristi, Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include "tls13/psk_ext_parser.h"
/* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no identities
* are present, or 0, on success.
*/
int _gnutls13_psk_ext_parser_init(psk_ext_parser_st *p,
const unsigned char *data, size_t _len)
{
ssize_t len = _len;
if (!p || !data || !len)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
memset(p, 0, sizeof(*p));
DECR_LEN(len, 2);
p->identities_len = _gnutls_read_uint16(data);
data += 2;
if (p->identities_len == 0)
return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
p->identities_data = (unsigned char *) data;
DECR_LEN(len, p->identities_len);
data += p->identities_len;
DECR_LEN(len, 2);
p->binders_len = _gnutls_read_uint16(data);
data += 2;
p->binders_data = data;
DECR_LEN(len, p->binders_len);
return 0;
}
/* Extract PSK identity and move to the next iteration.
*
* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no more identities
* are present, or 0, on success.
*/
int _gnutls13_psk_ext_iter_next_identity(psk_ext_iter_st *iter,
struct psk_st *psk)
{
if (iter->identities_len == 0)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
DECR_LEN(iter->identities_len, 2);
psk->identity.size = _gnutls_read_uint16(iter->identities_data);
if (psk->identity.size == 0)
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
iter->identities_data += 2;
psk->identity.data = (void*)iter->identities_data;
DECR_LEN(iter->identities_len, psk->identity.size);
iter->identities_data += psk->identity.size;
DECR_LEN(iter->identities_len, 4);
psk->ob_ticket_age = _gnutls_read_uint32(iter->identities_data);
iter->identities_data += 4;
return 0;
}
/* Extract PSK binder and move to the next iteration.
*
* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no more identities
* are present, or 0, on success.
*/
int _gnutls13_psk_ext_iter_next_binder(psk_ext_iter_st *iter,
gnutls_datum_t *binder)
{
if (iter->binders_len == 0)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
DECR_LEN(iter->binders_len, 1);
binder->size = *iter->binders_data;
if (binder->size == 0)
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
iter->binders_data++;
binder->data = (uint8_t *)iter->binders_data;
DECR_LEN(iter->binders_len, binder->size);
iter->binders_data += binder->size;
return 0;
}
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