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- changed return values from Boolean to "pm3"

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- added LED signals
This commit is contained in:
tharexde 2020-11-29 00:19:42 +01:00
commit 7bc372633f
1 changed files with 39 additions and 17 deletions
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56
armsrc/em4x50.c
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@ -34,6 +34,7 @@
#define EM4X50_T_TAG_FULL_PERIOD 64
#define EM4X50_T_TAG_TPP 64
#define EM4X50_T_TAG_TWA 64
#define EM4X50_T_TAG_WAITING_FOR_SIGNAL 75
#define EM4X50_T_WAITING_FOR_DBLLIW 1550
#define EM4X50_T_WAITING_FOR_SNGLLIW 140 // this value seems to be
// critical;
@ -195,7 +196,7 @@ static bool get_signalproperties(void) {
LED_A_ON();
// wait until signal/noise > 1 (max. 32 periods)
for (int i = 0; i < T0 * no_periods; i++) {
for (int i = 0; i < EM4X50_T_TAG_WAITING_FOR_SIGNAL; i++) {
if (BUTTON_PRESS()) return false;
@ -385,6 +386,8 @@ static bool find_single_listen_window(void) {
// find single listen window
int cnt_pulses = 0;
LED_B_ON();
while (cnt_pulses < EM4X50_T_WAITING_FOR_SNGLLIW) {
@ -394,13 +397,16 @@ static bool find_single_listen_window(void) {
if (check_pulse_length(get_pulse_length(), 2 * EM4X50_T_TAG_FULL_PERIOD)) {
// listen window found
// found listen window
LED_B_OFF();
return true;
}
}
cnt_pulses++;
}
LED_B_OFF();
return false;
}
@ -418,10 +424,16 @@ static int find_double_listen_window(bool bcommand) {
while (cnt_pulses < EM4X50_T_WAITING_FOR_DBLLIW) {
if (BUTTON_PRESS())
return BUTTON_SINGLE_CLICK;
// identification of listen window is done via evaluation of
// pulse lengths
if (check_pulse_length(get_pulse_length(), 3 * EM4X50_T_TAG_FULL_PERIOD)) {
//if (BUTTON_PRESS())
// return BUTTON_SINGLE_CLICK;
if (check_pulse_length(get_pulse_length(), 2 * EM4X50_T_TAG_FULL_PERIOD)) {
// first listen window found
@ -451,7 +463,7 @@ static int find_double_listen_window(bool bcommand) {
LED_B_OFF();
return true;
return PM3_SUCCESS;
}
}
@ -463,7 +475,7 @@ static int find_double_listen_window(bool bcommand) {
// return although second listen window consists of one
// more bit period but this period is necessary for
// evaluating further pulse lengths
return true;
return PM3_SUCCESS;
}
}
}
@ -472,18 +484,14 @@ static int find_double_listen_window(bool bcommand) {
LED_B_OFF();
return false;
return PM3_EFAILED;
}
static bool find_em4x50_tag(void) {
// function is used to check wether a tag on the proxmark is an
// EM4x50 tag or not -> speed up "lf search" process
LED_B_ON();
return find_single_listen_window();
LED_B_OFF();
}
static int request_receive_mode(void) {
@ -505,6 +513,9 @@ static bool check_ack(bool bliw) {
AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG;
while (AT91C_BASE_TC0->TC_CV < T0 * 4 * EM4X50_T_TAG_FULL_PERIOD) {
if (BUTTON_PRESS())
return false;
if (check_pulse_length(get_pulse_length(), 2 * EM4X50_T_TAG_FULL_PERIOD)) {
// The received signal is either ACK or NAK.
@ -803,7 +814,7 @@ static bool login(uint32_t password) {
// simple login to EM4x50,
// used in operations that require authentication
if (request_receive_mode()) {
if (request_receive_mode() == PM3_SUCCESS) {
// send login command
em4x50_reader_send_byte_with_parity(EM4X50_COMMAND_LOGIN);
@ -835,8 +846,19 @@ static bool brute(uint32_t start, uint32_t stop, uint32_t *pwd) {
for (*pwd = start; *pwd <= stop; (*pwd)++) {
if (login(*pwd) == PM3_SUCCESS) {
pwd_found = true;
break;
// to be safe login 5 more times
for (int i = 0; i < 5; i++) {
if (login(*pwd) != PM3_SUCCESS) {
pwd_found = false;
break;
}
}
if (pwd_found)
break;
}
// print password every 500 iterations
@ -970,7 +992,7 @@ static int reset(void) {
// resets EM4x50 tag (used by write function)
if (request_receive_mode()) {
if (request_receive_mode() == PM3_SUCCESS) {
// send reset command
em4x50_reader_send_byte_with_parity(EM4X50_COMMAND_RESET);
@ -1014,7 +1036,7 @@ static int standard_read(int *now, uint32_t *words) {
int fwr = *now, res = PM3_EFAILED;
// start with the identification of two successive listening windows
if (find_double_listen_window(false)) {
if ((res = find_double_listen_window(false)) == PM3_SUCCESS) {
// read and save words until following double listen window is detected
while ((res = get_word_from_bitstream(&words[*now])) == EM4X50_TAG_WORD)
@ -1041,7 +1063,7 @@ static int selective_read(uint32_t addresses, uint32_t *words) {
uint8_t lwr = (addresses >> 8) & 0xFF; // last word read (second byte)
int now = fwr; // number of words
if (request_receive_mode()) {
if (request_receive_mode() == PM3_SUCCESS) {
// send selective read command
em4x50_reader_send_byte_with_parity(EM4X50_COMMAND_SELECTIVE_READ);
@ -1180,7 +1202,7 @@ static int write(uint32_t word, uint32_t addresses) {
// writes <word> to specified <addresses>
if (request_receive_mode()) {
if (request_receive_mode() == PM3_SUCCESS) {
// send write command
em4x50_reader_send_byte_with_parity(EM4X50_COMMAND_WRITE);
@ -1220,7 +1242,7 @@ static int write_password(uint32_t password, uint32_t new_password) {
// changes password from <password> to <new_password>
if (request_receive_mode()) {
if (request_receive_mode() == PM3_SUCCESS) {
// send write password command
em4x50_reader_send_byte_with_parity(EM4X50_COMMAND_WRITE_PASSWORD);
@ -1503,7 +1525,7 @@ int em4x50_standalone_read(uint32_t *words) {
em4x50_setup_read();
if (get_signalproperties() && find_em4x50_tag())
if (find_double_listen_window(false))
if (find_double_listen_window(false) == PM3_SUCCESS)
while (get_word_from_bitstream(&words[now]) == EM4X50_TAG_WORD)
now++;