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/*
This file is part of TALER
Copyright (C) 2019 GNUnet e.V.
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file wallet.c
* @brief functions to communicate with taler wallet over nfc
* @author BOSS Marco
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "wallet.h"
int wallet_select_aid( nfc_device *pnd )
{
uint8_t response[] = { 0x00, 0x00 };
int size = sizeof( select_file ) + sizeof( taler_aid );
uint8_t message[size];
if( concat_message( select_file, sizeof(select_file), taler_aid, message, size ) )
return EXIT_FAILURE;
printf( "wallet_select_aid: Selecting Taler apk using AID: " );
for( unsigned int i = 0; i < sizeof(taler_aid); ++i )
printf( "%.2x", taler_aid[i] );
printf( "\n" );
if( nfc_initiator_transceive_bytes( pnd, message, size, response, sizeof(response), TRANSMIT_TIMEOUT ) < 0 ) {
printf( "wallet_select_aid: Failed to select apk\n\n" );
return EXIT_FAILURE;
}
return check_response( response, sizeof(response) );
}
int wallet_put_message( nfc_device *pnd, const char *msg, size_t msgSize )
{
uint8_t response[] = { 0x00, 0x00 };
int size = sizeof( put_data ) + msgSize;
uint8_t message[size];
if( concat_message( put_data, sizeof(put_data), (const uint8_t*)msg, message, size ) )
return EXIT_FAILURE;
printf( "wallet_put_messsage: Sending 'PUT DATA' command to wallet\n" );
if( nfc_initiator_transceive_bytes( pnd, message, size, response, sizeof(response), TRANSMIT_TIMEOUT ) < 0 ) {
printf( "wallet_put_message: Failed to put message\n\n" );
return EXIT_FAILURE;
}
return check_response( response, sizeof(response) );
}
int wallet_transmit( nfc_device *pnd, const char *msg, size_t msgLen )
{
if( !msg ) {
printf( "wallet_transmit: No message to send\n\n" );
return EXIT_FAILURE;
}
if( wallet_select_aid( pnd ) )
return EXIT_FAILURE;
printf( "wallet_transmit: Taler wallet apk selected\n\n" );
if( wallet_put_message( pnd, msg, msgLen ) )
return EXIT_FAILURE;
printf( "wallet_transmit: Transmitted message to taler wallet\n\n");
return EXIT_SUCCESS;
}
int check_response( uint8_t *response, uint8_t responseLen )
{
if( strcmp((char*)response, APDU_SUCCESS ) == 0 ){
printf("Transmission success\n");
} else {
printf("Transmission failure, return code: ");
for( uint8_t i = 0; i < responseLen; ++i ){
printf( "%.2x ", response[i] );
}
printf("\n");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int concat_message(const uint8_t* command, size_t commandSize, const uint8_t* message, uint8_t *retMsg, size_t returnSize )
{
if( !command || !message ){
printf( "concat_message: command and message can't be null" );
return EXIT_FAILURE;
}
uint8_t i = 0;
for( ; i < commandSize; ++i ){
retMsg[i] = command[i];
}
for( ; i < returnSize; ++i){
retMsg[i] = message[i - commandSize];
}
return EXIT_SUCCESS;
}
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