#define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz)))
-static const struct legic_frame queries[] = {
- {7, 0x55}, /* 1010 101 */
-};
-
-static const struct legic_frame responses[] = {
- {6, 0x3b}, /* 1101 11 */
-};
-
-/* Send a frame in tag mode, the FPGA must have been set up by
- * LegicRfSimulate
- */
-static void frame_send_tag(uint16_t response, int bits)
-{
-#if 0
- /* Use the SSC to send a response. 8-bit transfers, LSBit first, 100us per bit */
-#else
- /* Bitbang the response */
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
-
- /* Wait for the frame start */
- while(timer->TC_CV < TAG_TIME_WAIT) ;
-
- int i;
- for(i=0; i<bits; i++) {
- int nextbit = timer->TC_CV + TAG_TIME_BIT;
- int bit = response & 1;
- response = response >> 1;
- if(bit)
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- else
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- while(timer->TC_CV < nextbit) ;
- }
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
-#endif
-}
-
/* Send a frame in reader mode, the FPGA must have been set up by
* LegicRfReader
*/
/* Reset the timer, to measure time until the start of the tag frame */
timer->TC_CCR = AT91C_TC_SWTRG;
+ while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
}
/* Receive a frame from the card in reader emulation mode, the FPGA and
f->data = data;
f->bits = bits;
-}
-
-/* Figure out a response to a frame in tag mode */
-static void frame_respond_tag(struct legic_frame const * const f)
-{
- LED_D_ON();
- int i, r_size=0;
- uint16_t r_data=0;
- for(i=0; i<sizeof(queries)/sizeof(queries[0]); i++) {
- if(f->bits == queries[i].bits && f->data == queries[i].data) {
- r_data = responses[i].data;
- r_size = responses[i].bits;
- break;
- }
- }
-
- if(r_size != 0) {
- frame_send_tag(r_data, r_size);
- LED_A_ON();
- } else {
- LED_A_OFF();
- }
-
- LED_D_OFF();
-}
-
-static void frame_append_bit(struct legic_frame * const f, int bit)
-{
- if(f->bits >= 15)
- return; /* Overflow, won't happen */
- f->data |= (bit<<f->bits);
- f->bits++;
-}
-
-static int frame_is_empty(struct legic_frame const * const f)
-{
- return( f->bits <= 4 );
-}
-
-/* Handle (whether to respond) a frame in tag mode */
-static void frame_handle_tag(struct legic_frame const * const f)
-{
- if(f->bits == 6) {
- /* Short path */
- return;
- }
- if( !frame_is_empty(f) ) {
- frame_respond_tag(f);
- }
+ /* Reset the timer, to synchronize the next frame */
+ timer->TC_CCR = AT91C_TC_SWTRG;
+ while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
}
static void frame_clean(struct legic_frame * const f)
f->bits = 0;
}
-enum emit_mode {
- EMIT_RWD, /* Emit in tag simulation mode, e.g. the source is the RWD */
- EMIT_TAG /* Emit in reader simulation mode, e.g. the source is the TAG */
-};
-static void emit(enum emit_mode mode, int bit)
-{
- if(bit == -1) {
- if(mode == EMIT_RWD) {
- frame_handle_tag(¤t_frame);
- }
- frame_clean(¤t_frame);
- } else if(bit == 0) {
- frame_append_bit(¤t_frame, 0);
- } else if(bit == 1) {
- frame_append_bit(¤t_frame, 1);
- }
-}
-
-void LegicRfSimulate(void)
+static uint16_t perform_setup_phase_rwd(void)
{
- /* ADC path high-frequency peak detector, FPGA in high-frequency simulator mode,
- * modulation mode set to 212kHz subcarrier. We are getting the incoming raw
- * envelope waveform on DIN and should send our response on DOUT.
- *
- * The LEGIC RF protocol is pulse-pause-encoding from reader to card, so we'll
- * measure the time between two rising edges on DIN, and no encoding on the
- * subcarrier from card to reader, so we'll just shift out our verbatim data
- * on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,
- * seems to be 300us-ish.
- */
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
- /* Bitbang the receiver */
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ /* Switch on carrier and let the tag charge for 1ms */
+ AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
+ SpinDelay(1);
- setup_timer();
+ frame_send_rwd(0x55, 7);
+ frame_clean(¤t_frame);
+ frame_receive_rwd(¤t_frame, 6);
+ while(timer->TC_CV < 387) ; /* ~ 258us */
+ frame_send_rwd(0x019, 6);
- int old_level = 0;
- int active = 0;
+ return current_frame.data ^ 0x26;
+}
+
+static void switch_off_tag_rwd(void)
+{
+ /* Switch off carrier, make sure tag is reset */
+ AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ SpinDelay(10);
- while(!BUTTON_PRESS()) {
- int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
- int time = timer->TC_CV;
-
- if(level != old_level) {
- if(level == 1) {
- timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
- if(FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
- /* 1 bit */
- emit(EMIT_RWD, 1);
- active = 1;
- LED_B_ON();
- } else if(FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {
- /* 0 bit */
- emit(EMIT_RWD, 0);
- active = 1;
- LED_B_ON();
- } else if(active) {
- /* invalid */
- emit(EMIT_RWD, -1);
- active = 0;
- LED_B_OFF();
- }
- }
- }
-
- if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
- /* Frame end */
- emit(EMIT_RWD, -1);
- active = 0;
- LED_B_OFF();
- }
-
- if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
- timer->TC_CCR = AT91C_TC_CLKDIS;
- }
-
-
- old_level = level;
- WDT_HIT();
- }
+ WDT_HIT();
}
void LegicRfReader(void)
setup_timer();
- while(!BUTTON_PRESS()) {
- /* Switch on carrier and let the tag charge for 1ms */
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- SpinDelay(1);
-
- LED_A_ON();
- frame_send_rwd(queries[0].data, queries[0].bits);
- LED_A_OFF();
+ memset(BigBuf, 0, 1024);
+
+ int byte_index = 0, card_size = 0, command_size = 0;
+ uint16_t command_obfuscation = 0x57, response_obfuscation = 0;
+ uint16_t tag_type = perform_setup_phase_rwd();
+ switch_off_tag_rwd();
+
+ int error = 0;
+ switch(tag_type) {
+ case 0x1d:
+ DbpString("MIM 256 card found, reading card ...");
+ command_size = 9;
+ card_size = 256;
+ response_obfuscation = 0x52;
+ break;
+ case 0x3d:
+ DbpString("MIM 1024 card found, reading card ...");
+ command_size = 11;
+ card_size = 1024;
+ response_obfuscation = 0xd4;
+ break;
+ default:
+ DbpString("No or unknown card found, aborting");
+ error = 1;
+ break;
+ }
+
+ LED_B_ON();
+ while(!BUTTON_PRESS() && (byte_index<card_size)) {
+ if(perform_setup_phase_rwd() != tag_type) {
+ DbpString("Card removed, aborting");
+ switch_off_tag_rwd();
+ error=1;
+ break;
+ }
+ while(timer->TC_CV < 387) ; /* ~ 258us */
+ frame_send_rwd(command_obfuscation ^ (byte_index<<1), command_size);
frame_clean(¤t_frame);
- LED_B_ON();
- frame_receive_rwd(¤t_frame, responses[0].bits);
- LED_B_OFF();
+ frame_receive_rwd(¤t_frame, 8);
+ ((uint8_t*)BigBuf)[byte_index] = (current_frame.data ^ response_obfuscation) & 0xff;
- /* Switch off carrier, make sure tag is reset */
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- SpinDelay(10);
+ switch_off_tag_rwd();
WDT_HIT();
+ byte_index++;
+ if(byte_index & 0x04) LED_C_ON(); else LED_C_OFF();
+ }
+ LED_B_OFF();
+ LED_C_OFF();
+
+ if(!error) {
+ if(card_size == 256) {
+ DbpString("Card read, use hexsamples 256 to view results");
+ } else if(card_size == 1024) {
+ DbpString("Card read, use hexsamples 1024 to view results");
+ }
}
-
}
projects / proxmark3-svn / blobdiff