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/* Mifare Classic implementation, PCD side.
*
* (C) 2005-2006 by Harald Welte <laforge@gnumonks.org>
*
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <librfid/rfid.h>
#include <librfid/rfid_protocol.h>
#include <librfid/rfid_layer2.h>
#include <librfid/rfid_protocol_mifare_classic.h>
#include <librfid/rfid_reader.h>
#include "rfid_iso14443_common.h"
#define MIFARE_UL_CMD_WRITE 0xA2
#define MIFARE_UL_CMD_READ 0x30
#define MIFARE_CL_READ_FWT 250
#define MIFARE_CL_WRITE_FWT 600
static int
mfcl_read(struct rfid_protocol_handle *ph, unsigned int page,
unsigned char *rx_data, unsigned int *rx_len)
{
unsigned char rx_buf[16];
unsigned int real_rx_len = sizeof(rx_buf);
unsigned char tx[2];
int ret;
if (page > MIFARE_CL_PAGE_MAX)
return -EINVAL;
tx[0] = MIFARE_CL_CMD_READ;
tx[1] = page & 0xff;
ret = rfid_layer2_transceive(ph->l2h, RFID_MIFARE_FRAME, tx,
sizeof(tx), rx_buf, &real_rx_len,
MIFARE_CL_READ_FWT, 0);
if (ret < 0)
return ret;
if (real_rx_len == 1 && *rx_buf == 0x04)
return -EPERM;
if (real_rx_len < *rx_len)
*rx_len = real_rx_len;
memcpy(rx_data, rx_buf, *rx_len);
return ret;
}
static int
mfcl_write(struct rfid_protocol_handle *ph, unsigned int page,
unsigned char *tx_data, unsigned int tx_len)
{
unsigned char tx[2];
unsigned char rx[1];
unsigned int rx_len = sizeof(rx);
int ret;
if (page > MIFARE_CL_PAGE_MAX)
return -EINVAL;
if (tx_len != 16)
return -EINVAL;
tx[0] = MIFARE_CL_CMD_WRITE16;
tx[1] = page & 0xff;
ret = rfid_layer2_transceive(ph->l2h, RFID_MIFARE_FRAME, tx, 2, rx,
&rx_len, MIFARE_CL_WRITE_FWT, 0);
if (ret < 0)
return ret;
ret = rfid_layer2_transceive(ph->l2h, RFID_MIFARE_FRAME, tx_data,
tx_len, rx, &rx_len,
MIFARE_CL_WRITE_FWT, 0);
if (ret < 0)
return ret;
if (rx[0] != MIFARE_UL_RESP_ACK)
return -EIO;
return ret;
}
static int
mfcl_getopt(struct rfid_protocol_handle *ph, int optname, void *optval,
unsigned int *optlen)
{
int ret = -EINVAL;
u_int8_t atqa[2];
unsigned int atqa_size = sizeof(atqa);
unsigned int *size = optval;
switch (optname) {
case RFID_OPT_PROTO_SIZE:
if (*optlen < sizeof(*size))
return -EINVAL;
*optlen = sizeof(*size);
ret = 0;
rfid_layer2_getopt(ph->l2h, RFID_OPT_14443A_ATQA,
atqa, &atqa_size);
if (atqa[0] == 0x04 && atqa[1] == 0x00)
*size = 1024;
else if (atqa[0] == 0x02 && atqa[1] == 0x00)
*size = 4096;
else
ret = -EIO;
break;
}
return ret;
}
static struct rfid_protocol_handle *
mfcl_init(struct rfid_layer2_handle *l2h)
{
struct rfid_protocol_handle *ph;
if (l2h->l2->id != RFID_LAYER2_ISO14443A)
return NULL;
if (l2h->uid_len != 4)
return NULL;
ph = malloc_protocol_handle(sizeof(struct rfid_protocol_handle));
return ph;
}
static int mfcl_fini(struct rfid_protocol_handle *ph)
{
free_protocol_handle(ph);
return 0;
}
const struct rfid_protocol rfid_protocol_mfcl = {
.id = RFID_PROTOCOL_MIFARE_CLASSIC,
.name = "Mifare Classic",
.fn = {
.init = &mfcl_init,
.read = &mfcl_read,
.write = &mfcl_write,
.fini = &mfcl_fini,
.getopt = &mfcl_getopt,
},
};
int mfcl_set_key(struct rfid_protocol_handle *ph, unsigned char *key)
{
if (!ph->l2h->rh->reader->mifare_classic.setkey)
return -ENODEV;
return ph->l2h->rh->reader->mifare_classic.setkey(ph->l2h->rh, key);
}
int mfcl_auth(struct rfid_protocol_handle *ph, u_int8_t cmd, u_int8_t block)
{
u_int32_t serno = *((u_int32_t *)ph->l2h->uid);
if (!ph->l2h->rh->reader->mifare_classic.auth)
return -ENODEV;
return ph->l2h->rh->reader->mifare_classic.auth(ph->l2h->rh, cmd,
serno, block);
}
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