/*
 * Copyright (C) 2014 Frank Morgner
 *
 * This file is part of npa.
 *
 * npa 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.
 *
 * npa 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
 * npa.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * @file
 * @defgroup sm Interface to Secure Messaging (SM) defined in ISO 7816
 * @{
 */
#ifndef _CCID_SM_INTERNAL_H
#define _CCID_SM_INTERNAL_H

#include <libopensc/opensc.h>

#ifdef __cplusplus
extern "C" {
#endif



/* @brief Protect an APDU with Secure Messaging
 *
 * If secure messaging (SM) is activated in \a sctx and \a apdu is not already
 * SM protected, \a apdu is processed with the following steps:
 * \li call to \a sctx->pre_transmit
 * \li encrypt \a apdu calling \a sctx->encrypt
 * \li authenticate \a apdu calling \a sctx->authenticate
 * \li copy the SM protected data to \a sm_apdu
 *
 * Data for authentication or encryption is always padded before the callback
 * functions are called
 *
 * @param[in]     card
 * @param[in]     apdu
 * @param[in,out] sm_apdu
 *
 * @return \c SC_SUCCESS or error code if an error occurred
 */
int iso_get_sm_apdu(struct sc_card *card, struct sc_apdu *apdu, struct sc_apdu **sm_apdu);

/* @brief Remove Secure Messaging from an APDU
 *
 * If secure messaging (SM) is activated in \a sctx and \a apdu is not already
 * SM protected, \a apdu is processed with the following steps:
 * \li verify SM protected \a apdu calling \a sctx->verify_authentication
 * \li decrypt SM protected \a apdu calling \a sctx->decrypt
 * \li copy decrypted/authenticated data and status bytes to \a apdu
 *
 * Callback functions must not remove padding.
 *
 * @param[in]     card
 * @param[in,out] apdu
 * @param[in,out] sm_apdu will be freed when done.
 *
 * @return \c SC_SUCCESS or error code if an error occurred
 */
int iso_free_sm_apdu(struct sc_card *card, struct sc_apdu *apdu, struct sc_apdu **sm_apdu);

/**
 * @brief Cleans up allocated ressources of the ISO SM driver
 *
 * \c iso_sm_close() is designed as SM card operation. However, have in mind
 * that this card operation is not called automatically for \c
 * sc_disconnect_card() .
 *
 * @param[in] card
 *
 * @return \c SC_SUCCESS or error code if an error occurred
 */
int iso_sm_close(struct sc_card *card);

#ifdef  __cplusplus
}
#endif
#endif
/* @} */