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/*
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* Copyright (C) 2017-2018 Free Software Foundation, Inc.
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* Copyright (C) 2018 Red Hat, Inc.
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*
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* Author: Ander Juaristi, Nikos Mavrogiannopoulos
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*
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* This file is part of GnuTLS.
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*
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* The GnuTLS is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>
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*
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*/
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#include "gnutls_int.h"
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#include "tls13/psk_ext_parser.h"
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/* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no identities
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* are present, or 0, on success.
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*/
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int _gnutls13_psk_ext_parser_init(psk_ext_parser_st *p,
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const unsigned char *data, size_t len)
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{
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if (!p || !data || !len)
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return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
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memset(p, 0, sizeof(*p));
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DECR_LEN(len, 2);
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p->identities_len = _gnutls_read_uint16(data);
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data += 2;
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if (p->identities_len == 0)
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return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
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p->identities_data = (unsigned char *) data;
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DECR_LEN(len, p->identities_len);
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data += p->identities_len;
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DECR_LEN(len, 2);
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p->binders_len = _gnutls_read_uint16(data);
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data += 2;
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p->binders_data = data;
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DECR_LEN(len, p->binders_len);
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return 0;
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}
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/* Extract PSK identity and move to the next iteration.
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*
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* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no more identities
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* are present, or 0, on success.
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*/
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int _gnutls13_psk_ext_iter_next_identity(psk_ext_iter_st *iter,
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struct psk_st *psk)
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{
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if (iter->identities_len == 0)
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return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
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DECR_LEN(iter->identities_len, 2);
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psk->identity.size = _gnutls_read_uint16(iter->identities_data);
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if (psk->identity.size == 0)
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return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
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iter->identities_data += 2;
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psk->identity.data = (void*)iter->identities_data;
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DECR_LEN(iter->identities_len, psk->identity.size);
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iter->identities_data += psk->identity.size;
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DECR_LEN(iter->identities_len, 4);
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psk->ob_ticket_age = _gnutls_read_uint32(iter->identities_data);
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iter->identities_data += 4;
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return 0;
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}
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/* Extract PSK binder and move to the next iteration.
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*
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* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no more identities
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* are present, or 0, on success.
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*/
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int _gnutls13_psk_ext_iter_next_binder(psk_ext_iter_st *iter,
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gnutls_datum_t *binder)
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{
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if (iter->binders_len == 0)
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return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
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DECR_LEN(iter->binders_len, 1);
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binder->size = *iter->binders_data;
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if (binder->size == 0)
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return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
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iter->binders_data++;
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binder->data = (uint8_t *)iter->binders_data;
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DECR_LEN(iter->binders_len, binder->size);
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iter->binders_data += binder->size;
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return 0;
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}
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