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/*! \file oap.h
* Osmocom Authentication Protocol message encoder/decoder. */
/*
* (C) 2015-2016 by sysmocom s.f.m.c. GmbH
* All Rights Reserved
*
* Author: Neels Hofmeyr
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#pragma once
#include <stdint.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
/*! Information Element Identifiers for OAP IEs.
* They match osmo_gsup_iei (so far). */
enum osmo_oap_iei {
OAP_CAUSE_IE = 0x02,
OAP_RAND_IE = 0x20,
OAP_AUTN_IE = 0x23,
OAP_XRES_IE = 0x24,
OAP_AUTS_IE = 0x25,
OAP_CLIENT_ID_IE = 0x30,
};
/*! OAP message types */
enum osmo_oap_message_type {
OAP_MSGT_REGISTER_REQUEST = 0b00000100,
OAP_MSGT_REGISTER_ERROR = 0b00000101,
OAP_MSGT_REGISTER_RESULT = 0b00000110,
OAP_MSGT_CHALLENGE_REQUEST = 0b00001000,
OAP_MSGT_CHALLENGE_ERROR = 0b00001001,
OAP_MSGT_CHALLENGE_RESULT = 0b00001010,
OAP_MSGT_SYNC_REQUEST = 0b00001100,
OAP_MSGT_SYNC_ERROR = 0b00001101,
OAP_MSGT_SYNC_RESULT = 0b00001110,
};
/*! Parsed/decoded OAP protocol message */
struct osmo_oap_message {
enum osmo_oap_message_type message_type;
enum gsm48_gmm_cause cause;
uint16_t client_id;
int rand_present;
uint8_t rand[16];
int autn_present;
uint8_t autn[16];
int xres_present;
uint8_t xres[8];
int auts_present;
uint8_t auts[14];
};
int osmo_oap_decode(struct osmo_oap_message *oap_msg, const uint8_t *data,
size_t data_len);
void osmo_oap_encode(struct msgb *msg, const struct osmo_oap_message *oap_msg);
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