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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <librfid/rfid.h>
#include <librfid/rfid_access_mifare_classic.h>
/* parse encoded data structure into c1/c2/c3 */
int mfcl_compile_access(u_int8_t *encoded,
const struct mfcl_access_sect *ac)
{
int b;
u_int8_t c1, c2, c3;
c1 = c2 = c3 = 0;
for (b = 0; b < 4; b++) {
if (ac->block[b] & 0x01)
c1 |= (1 << b);
if (ac->block[b] & 0x02)
c2 |= (1 << b);
if (ac->block[b] & 0x04)
c3 |= (1 << b);
}
DEBUGP("compile: c1=%u c2=%u c3=%u\n", c1, c2, c3);
encoded[3] = 0x00;
encoded[2] = c2 | (c3 << 4);
encoded[1] = (~c3 & 0xf) | (c1 << 4);
encoded[0] = (~c1 & 0xf) | ((~c2 & 0xf) << 4);
return 0;
}
/* parse mifare classic access conditions from card */
int mfcl_parse_access(struct mfcl_access_sect *ac, u_int8_t *encoded)
{
int b;
u_int8_t c1, c2, c3;
DEBUGP("encoded: %s\n", rfid_hexdump(encoded, 4));
c1 = encoded[1] >> 4;
c2 = encoded[2] & 0xf;
c3 = encoded[2] >> 4;
DEBUGP("c1=0x%x, c2=0x%x, c3=0x%x\n", c1, c2, c3);
memset(ac, 0, sizeof(*ac));
for (b = 0; b < 4; b++) {
if (c1 & (1 << b))
ac->block[b] = 0x1;
if (c2 & (1 << b))
ac->block[b] |= 0x2;
if (c3 & (1 << b))
ac->block[b] |= 0x4;
};
/* FIXME: verify the inverted access bits */
return 0;
}
/* functions below here are for our own internal decoded (orthogonal)
* format of access bits */
/* In the order of the table 3.7.3 in MFCL Product Specification Rev. 5.1 */
static const struct mfcl_access_exp_block mfcl_exp_data[] = {
[0] = {
.read = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.inc = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.dec = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
},
[2] = {
.read = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_NEVER,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_NEVER,
},
[1] = {
.read = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_KEY_B,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_NEVER,
},
[3] = {
.read = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_KEY_B,
.inc = MFCL_ACCESS_KEY_B,
.dec = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
},
[4] = {
.read = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_NEVER,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
},
[6] = {
.read = MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_KEY_B,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_NEVER,
},
[5] = {
.read = MFCL_ACCESS_KEY_B,
.write = MFCL_ACCESS_NEVER,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_NEVER,
},
[7] = {
.read = MFCL_ACCESS_NEVER,
.write = MFCL_ACCESS_NEVER,
.inc = MFCL_ACCESS_NEVER,
.dec = MFCL_ACCESS_NEVER,
},
};
static const struct mfcl_access_exp_acc mfcl_exp_trailer[] = {
[0] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_KEY_A,
.acc_rd = MFCL_ACCESS_KEY_A,
.acc_wr = MFCL_ACCESS_NEVER,
.key_b_rd = MFCL_ACCESS_KEY_A,
.key_b_wr = MFCL_ACCESS_KEY_A,
},
[2] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_NEVER,
.acc_rd = MFCL_ACCESS_KEY_A,
.acc_wr = MFCL_ACCESS_NEVER,
.key_b_rd = MFCL_ACCESS_KEY_A,
.key_b_wr = MFCL_ACCESS_NEVER,
},
[1] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_KEY_B,
.acc_rd = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.acc_wr = MFCL_ACCESS_NEVER,
.key_b_rd = MFCL_ACCESS_NEVER,
.key_b_wr = MFCL_ACCESS_KEY_B,
},
[3] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_NEVER,
.acc_rd = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.acc_wr = MFCL_ACCESS_NEVER,
.key_b_rd = MFCL_ACCESS_NEVER,
.key_b_wr = MFCL_ACCESS_NEVER,
},
[4] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_KEY_A,
.acc_rd = MFCL_ACCESS_KEY_A,
.acc_wr = MFCL_ACCESS_KEY_A,
.key_b_rd = MFCL_ACCESS_KEY_A,
.key_b_wr = MFCL_ACCESS_KEY_A,
},
[6] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_KEY_B,
.acc_rd = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.acc_wr = MFCL_ACCESS_KEY_B,
.key_b_rd = MFCL_ACCESS_NEVER,
.key_b_wr = MFCL_ACCESS_KEY_B,
},
[5] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_NEVER,
.acc_rd = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.acc_wr = MFCL_ACCESS_KEY_B,
.key_b_rd = MFCL_ACCESS_NEVER,
.key_b_wr = MFCL_ACCESS_NEVER,
},
[7] = {
.key_a_rd = MFCL_ACCESS_NEVER,
.key_a_wr = MFCL_ACCESS_NEVER,
.acc_rd = MFCL_ACCESS_KEY_A | MFCL_ACCESS_KEY_B,
.acc_wr = MFCL_ACCESS_NEVER,
.key_b_rd = MFCL_ACCESS_NEVER,
.key_b_wr = MFCL_ACCESS_NEVER,
},
};
const char *mfcl_access_str[] = {
[MFCL_ACCESS_NEVER] = "NEVER",
[MFCL_ACCESS_KEY_A] = "A",
[MFCL_ACCESS_KEY_B] = "B",
[MFCL_ACCESS_KEY_A|MFCL_ACCESS_KEY_B] = "A|B",
};
void mfcl_access_to_exp(struct mfcl_access_exp_sect *exp,
const struct mfcl_access_sect *sect)
{
int b;
for (b = 0; b < 3; b++)
exp->block[b] = mfcl_exp_data[sect->block[b]];
exp->acc = mfcl_exp_trailer[sect->block[3]];
}
char *mfcl_access_exp_stringify(const struct mfcl_access_exp_block *exp)
{
static char buf[80];
sprintf(buf, "READ: %s, WRITE: %s, INC: %s, DEC: %s",
mfcl_access_str[exp->read],
mfcl_access_str[exp->write],
mfcl_access_str[exp->inc],
mfcl_access_str[exp->dec]);
return buf;
}
char *mfcl_access_exp_acc_stringify(const struct mfcl_access_exp_acc *acc)
{
static char buf[80];
sprintf(buf, "KEY_A_RD: %s, KEY_A_WR: %s, ACC_RD: %s, ACC_WR: %s, "
"KEY_B_RD: %s, KEY_B_WR: %s",
mfcl_access_str[acc->key_a_rd],
mfcl_access_str[acc->key_a_wr],
mfcl_access_str[acc->acc_rd],
mfcl_access_str[acc->acc_wr],
mfcl_access_str[acc->key_b_rd],
mfcl_access_str[acc->key_b_wr]);
return buf;
}
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