added standalone mode "brute force"

This commit is contained in:
tharexde 2020-10-03 22:59:21 +02:00
commit a9ec622d97
3 changed files with 392 additions and 100 deletions

View file

@ -451,7 +451,7 @@ static bool find_single_listen_window(void) {
return false;
}
static bool find_double_listen_window(bool bcommand) {
static int find_double_listen_window(bool bcommand) {
// find two successive listen windows that indicate the beginning of
// data transmission
@ -505,13 +505,160 @@ static bool find_double_listen_window(bool bcommand) {
return true;
}
}
cnt_pulses++;
}
cnt_pulses++;
}
return false;
}
static bool em4x50_sim_send_bit(uint8_t bit) {
uint16_t check = 0;
for (int t = 0; t < EM4X50_T_TAG_FULL_PERIOD; t++) {
// wait until SSC_CLK goes HIGH
// used as a simple detection of a reader field?
while (!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {
WDT_HIT();
if (check == 1000) {
if (BUTTON_PRESS())
return false;
check = 0;
}
++check;
}
if (bit)
OPEN_COIL();
else
SHORT_COIL();
check = 0;
//wait until SSC_CLK goes LOW
while (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) {
WDT_HIT();
if (check == 1000) {
if (BUTTON_PRESS())
return false;
check = 0;
}
++check;
}
if (t == EM4X50_T_TAG_HALF_PERIOD)
bit ^= 1;
}
return true;
}
static bool em4x50_sim_send_byte(uint8_t byte) {
// send byte
for (int i = 0; i < 8; i++)
if (!em4x50_sim_send_bit((byte >> (7 - i)) & 1))
return false;
return true;
}
static bool em4x50_sim_send_byte_with_parity(uint8_t byte) {
uint8_t parity = 0x0;
// send byte with parity (even)
for (int i = 0; i < 8; i++)
parity ^= (byte >> i) & 1;
if (!em4x50_sim_send_byte(byte))
return false;;
if (!em4x50_sim_send_bit(parity))
return false;
return true;
}
bool em4x50_sim_send_word(uint32_t word) {
uint8_t cparity = 0x00;
// 4 bytes each with even row parity bit
for (int i = 0; i < 4; i++)
if (!em4x50_sim_send_byte_with_parity((word >> ((3 - i) * 8)) & 0xFF))
return false;
// column parity
for (int i = 0; i < 8; i++) {
cparity <<= 1;
for (int j = 0; j < 4; j++) {
cparity ^= (((word >> ((3 - j) * 8)) & 0xFF) >> (7 - i)) & 1;
}
}
if (!em4x50_sim_send_byte(cparity))
return false;
// stop bit
if (!em4x50_sim_send_bit(0))
return false;
return true;
}
bool em4x50_sim_send_listen_window(void) {
//int i = 0;
uint16_t check = 0;
//uint8_t test[100] = {0};
for (int t = 0; t < 5 * EM4X50_T_TAG_FULL_PERIOD; t++) {
// wait until SSC_CLK goes HIGH
while (!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {
WDT_HIT();
if (check == 1000) {
if (BUTTON_PRESS())
return false;
check = 0;
}
++check;
}
if (t >= 4 * EM4X50_T_TAG_FULL_PERIOD) {
SHORT_COIL();
} else if (t >= 3 * EM4X50_T_TAG_FULL_PERIOD) {
OPEN_COIL();
} else if (t >= EM4X50_T_TAG_FULL_PERIOD) {
SHORT_COIL();
} else if (t >= EM4X50_T_TAG_HALF_PERIOD) {
OPEN_COIL();
} else {
SHORT_COIL();
}
check = 0;
//wait until SSC_CLK goes LOW
while (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) {
WDT_HIT();
if (check == 1000) {
if (BUTTON_PRESS())
return false;
check = 0;
}
++check;
}
}
return true;
}
static bool find_em4x50_tag(void) {
// function is used to check wether a tag on the proxmark is an
@ -519,7 +666,7 @@ static bool find_em4x50_tag(void) {
return find_single_listen_window();
}
static bool request_receive_mode(void) {
static int request_receive_mode(void) {
// To issue a command we have to find a listen window first.
// Because identification and sychronization at the same time is not
@ -1100,67 +1247,29 @@ void em4x50_wipe(em4x50_data_t *etd) {
reply_ng(CMD_ACK, bsuccess, (uint8_t *)tag.sectors, 238);
}
void em4x50_brute(em4x50_data_t *etd) {
void em4x50_reset(void) {
// searching for password in given range
// reset EM4x50
uint8_t status = 0;
bool bsuccess = false;
int cnt = 0;
uint8_t bytes[4] ={0x0, 0x0, 0x0, 0x0};
uint32_t pwd = 0x0, rpwd = 0x0;
init_tag();
em4x50_setup_read();
// set gHigh and gLow
if (get_signalproperties() && find_em4x50_tag()) {
for (pwd = etd->start_password; pwd <= etd->stop_password; pwd++) {
// lsb -> msb
rpwd = reflect32(pwd);
for (int i = 0; i < 4; i++)
bytes[i] = (rpwd >> ((3 - i) * 8)) & 0xFF;
if (login(bytes)) {
bsuccess = true;
break;
}
// print password every 500 iterations
if ((++cnt % 500) == 0) {
// print header
if (cnt == 500) {
Dbprintf("");
Dbprintf("|---------+------------+------------|");
Dbprintf("| no. | pwd (msb) | pwd (lsb) |");
Dbprintf("|---------+------------+------------|");
}
// print data
Dbprintf("|%8i | 0x%08x | 0x%08x |", cnt, rpwd, pwd);
}
if (BUTTON_PRESS())
break;
}
// print footer
if (cnt >= 500)
Dbprintf("|---------+------------+------------|");
status = reset();
}
lf_finalize();
reply_ng(CMD_ACK, bsuccess, (uint8_t *)(&pwd), 32);
reply_ng(CMD_ACK, status, 0, 0);
}
void em4x50_login(em4x50_data_t *etd) {
// login into EM4x50
uint8_t status = 0;
uint8_t status = false;
uint8_t bytes[4] = {0x0, 0x0, 0x0, 0x0};
uint32_t rpwd = 0x0;
@ -1183,22 +1292,87 @@ void em4x50_login(em4x50_data_t *etd) {
reply_ng(CMD_ACK, status, 0, 0);
}
void em4x50_reset(void) {
static bool brute(uint32_t start, uint32_t stop, uint32_t *pwd) {
// reset EM4x50
// searching for password in given range
uint8_t status = 0;
bool pwd_found = false;
int cnt = 0;
uint32_t rpwd = 0x0;
uint8_t bytes[4] = {0x0, 0x0, 0x0, 0x0};
for (*pwd = start; *pwd <= stop; (*pwd)++) {
// lsb -> msb
rpwd = reflect32(*pwd);
for (int i = 0; i < 4; i++)
bytes[i] = (rpwd >> ((3 - i) * 8)) & 0xFF;
if (login(bytes)) {
pwd_found = true;
break;
}
// print password every 500 iterations
if ((++cnt % 500) == 0) {
// print header
if (cnt == 500) {
Dbprintf("|---------+------------+------------|");
Dbprintf("| no. | pwd (msb) | pwd (lsb) |");
Dbprintf("|---------+------------+------------|");
}
// print data
Dbprintf("|%8i | 0x%08x | 0x%08x |", cnt, rpwd, *pwd);
}
if (BUTTON_PRESS())
break;
}
// print footer
if (cnt >= 500)
Dbprintf("|---------+------------+------------|");
return pwd_found;
}
void em4x50_brute(em4x50_data_t *etd) {
// envoke password search
bool bsuccess = false;
uint32_t pwd = 0x0;
em4x50_setup_read();
if (get_signalproperties() && find_em4x50_tag())
bsuccess = brute(etd->start_password, etd->stop_password, &pwd);
lf_finalize();
reply_ng(CMD_ACK, bsuccess, (uint8_t *)(&pwd), 32);
}
int em4x50_standalone_brute(uint32_t start, uint32_t stop, uint32_t *pwd) {
// envoke password search in standalone mode
int status = false;
em4x50_setup_read();
// set gHigh and gLow
if (get_signalproperties() && find_em4x50_tag()) {
status = reset();
status = brute(start, stop, pwd);
} else {
status = PM3_ETIMEOUT;
}
lf_finalize();
reply_ng(CMD_ACK, status, 0, 0);
return status;
}
int em4x50_standalone_read(uint64_t *words) {