// LEGIC RF simulation code
//-----------------------------------------------------------------------------
-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-
#include "legicrf.h"
-#include "legic_prng.h"
-#include "crc.h"
static struct legic_frame {
int bits;
static int legic_frame_drift;
static int legic_reqresp_drift;
+int timestamp;
+
AT91PS_TC timer;
AT91PS_TC prng_timer;
-static void setup_timer(void)
-{
- /* Set up Timer 1 to use for measuring time between pulses. Since we're bit-banging
- * this it won't be terribly accurate but should be good enough.
- */
+/*
+static void setup_timer(void) {
+ // Set up Timer 1 to use for measuring time between pulses. Since we're bit-banging
+ // this it won't be terribly accurate but should be good enough.
+ //
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1);
timer = AT91C_BASE_TC1;
timer->TC_CCR = AT91C_TC_CLKDIS;
timer->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK;
timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
- /*
- * Set up Timer 2 to use for measuring time between frames in
- * tag simulation mode. Runs 4x faster as Timer 1
- */
+ //
+ // Set up Timer 2 to use for measuring time between frames in
+ // tag simulation mode. Runs 4x faster as Timer 1
+ //
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC2);
prng_timer = AT91C_BASE_TC2;
prng_timer->TC_CCR = AT91C_TC_CLKDIS;
prng_timer->TC_CMR = AT91C_TC_CLKS_TIMER_DIV2_CLOCK;
prng_timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
}
+*/
+
+// At TIMER_CLOCK3 (MCK/32)
+//#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */
+//#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */
+//#define RWD_TIME_PAUSE 30 /* 20us */
+
+#define RWD_TIME_1 80 /* READER_TIME_PAUSE off, 80us on = 100us */
+#define RWD_TIME_0 40 /* READER_TIME_PAUSE off, 40us on = 60us */
+#define RWD_TIME_PAUSE 20 /* 20us */
+
+#define TAG_BIT_PERIOD 100 // 100us for every bit
-/* At TIMER_CLOCK3 (MCK/32) */
-#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */
-#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */
-#define RWD_TIME_PAUSE 30 /* 20us */
#define RWD_TIME_FUZZ 20 /* rather generous 13us, since the peak detector + hysteresis fuzz quite a bit */
-#define TAG_TIME_BIT 150 /* 100us for every bit */
-#define TAG_TIME_WAIT 490 /* time from RWD frame end to tag frame start, experimentally determined */
+
+
+//#define TAG_TIME_WAIT 490 /* 490 time from READER frame end to TAG frame start, experimentally determined */
+#define TAG_TIME_WAIT 258 // 330us from READER frame end to TAG frame start, experimentally determined
+#define RDW_TIME_WAIT 258 //
+
#define SIM_DIVISOR 586 /* prng_time/SIM_DIVISOR count prng needs to be forwared */
#define SIM_SHIFT 900 /* prng_time+SIM_SHIFT shift of delayed start */
-#define SESSION_IV 0x55
#define OFFSET_LOG 1024
#define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz)))
+#ifndef SHORT_COIL
+//#define LOW(x) AT91C_BASE_PIOA->PIO_CODR = (x)
+# define SHORT_COIL() LOW(GPIO_SSC_DOUT);
+#endif
+#ifndef OPEN_COIL
+//#define HIGH(x) AT91C_BASE_PIOA->PIO_SODR = (x)
+# define OPEN_COIL() HIGH(GPIO_SSC_DOUT);
+#endif
+
+uint32_t stop_send_frame_us = 0;
+
+// ~ 258us + 100us*delay
+#define WAIT(delay) SpinDelayUs(delay);
+#define WAIT_100 WAIT(100)
+
+#define COIL_PULSE(delay) \
+ SHORT_COIL() \
+ SpinDelayUs(RWD_TIME_PAUSE); \
+ OPEN_COIL() \
+ SpinDelayUs(delay);
+
+// ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces.
+// Historically it used to be FREE_BUFFER_SIZE, which was 2744.
+#define LEGIC_CARD_MEMSIZE 1024
+static uint8_t* cardmem;
+
+// Starts Clock and waits until its reset
+static void Reset(AT91PS_TC clock){
+ clock->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+ while(clock->TC_CV > 1) ;
+}
+
+// Starts Clock and waits until its reset
+static void ResetClock(void){
+ Reset(timer);
+}
+
+// Prng works when waiting in 99.1us cycles.
+// and while sending/receiving in bit frames (100, 60)
+static void CalibratePrng( uint32_t time){
+ // Calculate Cycles based on timer 100us
+ uint32_t i = (time - stop_send_frame_us) / 100 ;
+
+ // substract cycles of finished frames
+ int k = i - legic_prng_count()+1;
+
+ // substract current frame length, rewind to beginning
+ if ( k > 0 )
+ legic_prng_forward(k);
+}
+
/* Generate Keystream */
static uint32_t get_key_stream(int skip, int count)
{
- uint32_t key=0; int i;
+ uint32_t key = 0;
+ int i;
- /* Use int to enlarge timer tc to 32bit */
+ // Use int to enlarge timer tc to 32bit
legic_prng_bc += prng_timer->TC_CV;
- prng_timer->TC_CCR = AT91C_TC_SWTRG;
+
+ // reset the prng timer.
+ Reset(prng_timer);
/* If skip == -1, forward prng time based */
if(skip == -1) {
- i = (legic_prng_bc+SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */
+ i = (legic_prng_bc + SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */
i -= legic_prng_count(); /* substract cycles of finished frames */
- i -= count; /* substract current frame length, rewidn to bedinning */
+ i -= count; /* substract current frame length, rewind to beginning */
legic_prng_forward(i);
} else {
legic_prng_forward(skip);
}
- /* Write Time Data into LOG */
- uint8_t *BigBuf = BigBuf_get_addr();
i = (count == 6) ? -1 : legic_read_count;
- BigBuf[OFFSET_LOG+128+i] = legic_prng_count();
- BigBuf[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff;
- BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
- BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
- BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
- BigBuf[OFFSET_LOG+384+i] = count;
+ /* Write Time Data into LOG */
+ // uint8_t *BigBuf = BigBuf_get_addr();
+ // BigBuf[OFFSET_LOG+128+i] = legic_prng_count();
+ // BigBuf[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff;
+ // BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
+ // BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
+ // BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
+ // BigBuf[OFFSET_LOG+384+i] = count;
/* Generate KeyStream */
for(i=0; i<count; i++) {
/* 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, int crypt)
-{
- /* 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;
-
- /* Use time to crypt frame */
- if(crypt) {
- legic_prng_forward(2); /* TAG_TIME_WAIT -> shift by 2 */
- int i; int key = 0;
- for(i=0; i<bits; i++) {
- key |= legic_prng_get_bit() << i;
- legic_prng_forward(1);
- }
- //Dbprintf("key = 0x%x", key);
- response = response ^ key;
- }
+static void frame_send_tag(uint16_t response, uint8_t bits, uint8_t crypt) {
+ /* Bitbang the response */
+ LOW(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 - 30)) ;
-
- 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) ;
+ /* Use time to crypt frame */
+ if(crypt) {
+ legic_prng_forward(2); /* TAG_TIME_WAIT -> shift by 2 */
+ response ^= legic_prng_get_bits(bits);
+ }
+
+ /* Wait for the frame start */
+ WAIT( TAG_TIME_WAIT )
+
+ uint8_t bit = 0;
+ for(int i = 0; i < bits; i++) {
+
+ bit = response & 1;
+ response >>= 1;
+
+ if (bit)
+ HIGH(GPIO_SSC_DOUT);
+ else
+ LOW(GPIO_SSC_DOUT);
+
+ WAIT_100
}
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ LOW(GPIO_SSC_DOUT);
}
/* Send a frame in reader mode, the FPGA must have been set up by
* LegicRfReader
*/
-static void frame_send_rwd(uint32_t data, int bits)
-{
- /* Start clock */
- timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
- while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
-
- int i;
- for(i=0; i<bits; i++) {
- int starttime = timer->TC_CV;
- int pause_end = starttime + RWD_TIME_PAUSE, bit_end;
- int bit = data & 1;
- data = data >> 1;
-
- if(bit ^ legic_prng_get_bit())
- bit_end = starttime + RWD_TIME_1;
- else
- bit_end = starttime + RWD_TIME_0;
-
+static void frame_sendAsReader(uint32_t data, uint8_t bits){
- /* RWD_TIME_PAUSE time off, then some time on, so that the complete bit time is
- * RWD_TIME_x, where x is the bit to be transmitted */
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- while(timer->TC_CV < pause_end) ;
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- legic_prng_forward(1); /* bit duration is longest. use this time to forward the lfsr */
+ uint32_t starttime = GetCountUS();
+ uint32_t send = data;
+ uint8_t prng1 = legic_prng_count() ;
+ uint16_t mask = 1;
+ uint16_t lfsr = legic_prng_get_bits(bits);
- while(timer->TC_CV < bit_end);
+ // xor the lsfr onto data.
+ send ^= lfsr;
+
+ for (; mask < BITMASK(bits); mask <<= 1) {
+ if (send & mask) {
+ COIL_PULSE(RWD_TIME_1)
+ } else {
+ COIL_PULSE(RWD_TIME_0)
+ }
}
- /* One final pause to mark the end of the frame */
- int pause_end = timer->TC_CV + RWD_TIME_PAUSE;
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- while(timer->TC_CV < pause_end) ;
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
-
-
- /* 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 */
+ // One final pause to mark the end of the frame
+ COIL_PULSE(0)
+
+ // log
+ stop_send_frame_us = GetCountUS();
+ uint8_t cmdbytes[] = {
+ data & 0xFF,
+ (data >> 8) & 0xFF,
+ lfsr & 0xFF,
+ (lfsr >> 8) & 0xFF,
+ prng1,
+ legic_prng_count()
+ };
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, TRUE);
}
/* Receive a frame from the card in reader emulation mode, the FPGA and
- * timer must have been set up by LegicRfReader and frame_send_rwd.
+ * timer must have been set up by LegicRfReader and frame_sendAsReader.
*
* The LEGIC RF protocol from card to reader does not include explicit
* frame start/stop information or length information. The reader must
* for edges. Count the edges in each bit interval. If they are approximately
* 0 this was a 0-bit, if they are approximately equal to the number of edges
* expected for a 212kHz subcarrier, this was a 1-bit. For timing we use the
- * timer that's still running from frame_send_rwd in order to get a synchronization
+ * timer that's still running from frame_sendAsReader in order to get a synchronization
* with the frame that we just sent.
*
* FIXME: Because we're relying on the hysteresis to just do the right thing
* the range is severely reduced (and you'll probably also need a good antenna).
* So this should be fixed some time in the future for a proper receiver.
*/
-static void frame_receive_rwd(struct legic_frame * const f, int bits, int crypt)
-{
- uint32_t the_bit = 1; /* Use a bitmask to save on shifts */
- uint32_t data=0;
- int i, old_level=0, edges=0;
- int next_bit_at = TAG_TIME_WAIT;
-
- if(bits > 32) {
- bits = 32;
- }
+static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, uint8_t crypt) {
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ uint32_t starttime = GetCountUS();
+
+ uint8_t i = 0;
+ uint32_t the_bit = 1;
+ uint32_t next_bit_at;
+ uint32_t data;/* Use a bitmask to save on shifts */
- /* we have some time now, precompute the cipher
- * since we cannot compute it on the fly while reading */
- legic_prng_forward(2);
+ int old_level = 0, edges = 0, level = 0;
- if(crypt) {
- for(i=0; i<bits; i++) {
- data |= legic_prng_get_bit() << i;
- legic_prng_forward(1);
- }
- }
+ if(bits > 32) bits = 32;
- while(timer->TC_CV < next_bit_at) ;
+ AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
- next_bit_at += TAG_TIME_BIT;
+ // calibrate the prng.
+ // the time between end-of-send and here, div 100us
+ CalibratePrng( starttime );
+
+ // precompute the cipher
+ uint8_t prng1 = legic_prng_count() ;
+ if(crypt)
+ data = legic_prng_get_bits(bits);
- for(i=0; i<bits; i++) {
+ uint16_t lsfr = data;
+
+ // FIXED time between sending frame and now listening frame.
+ WAIT(TAG_TIME_WAIT)
+ //uint32_t iced = GetCountUS() - starttime;
+ //uint32_t icetime = TAG_TIME_WAIT - iced;
+ // if (icetime > TAG_TIME_WAIT)
+ // icetime = TAG_TIME_WAIT;
+ //WAIT( icetime )
+
+ next_bit_at = GetCountUS();
+ next_bit_at += TAG_BIT_PERIOD;
+
+ for( i = 0; i < bits; i++) {
edges = 0;
- while(timer->TC_CV < next_bit_at) {
- int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
- if(level != old_level)
+ while ( GetCountUS() < next_bit_at) {
+
+ level = AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN;
+
+ if (level != old_level)
edges++;
old_level = level;
}
- next_bit_at += TAG_TIME_BIT;
+ next_bit_at += TAG_BIT_PERIOD;
- if(edges > 20 && edges < 60) { /* expected are 42 edges */
+ // We expect 42 edges == ONE
+ if(edges > 20 && edges < 60) {
+ DbpString("one");
data ^= the_bit;
- }
+ }
the_bit <<= 1;
}
f->data = data;
f->bits = bits;
-
- /* 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 */
+
+ // log
+ uint8_t cmdbytes[] = {
+ (data & 0xFF),
+ (data >> 8) & 0xFF,
+ (lsfr & 0xFF),
+ (lsfr >> 8) & 0xFF,
+ prng1,
+ legic_prng_count()
+ };
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GetCountUS(), NULL, FALSE);
}
-static void frame_append_bit(struct legic_frame * const f, int bit)
-{
- if (f->bits >= 31)
- return; /* Overflow, won't happen */
+static void frame_append_bit(struct legic_frame * const f, int bit) {
+ // Overflow, won't happen
+ if (f->bits >= 31) return;
f->data |= (bit << f->bits);
f->bits++;
}
-static void frame_clean(struct legic_frame * const f)
-{
+static void frame_clean(struct legic_frame * const f) {
f->data = 0;
f->bits = 0;
}
-static uint32_t perform_setup_phase_rwd(int iv)
-{
+// Setup pm3 as a Legic Reader
+static uint32_t perform_setup_phase_rwd(uint8_t iv) {
- /* Switch on carrier and let the tag charge for 1ms */
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- SpinDelay(1);
+ // Switch on carrier and let the tag charge for 1ms
+ HIGH(GPIO_SSC_DOUT);
+ SpinDelay(40);
+
+ ResetUSClock();
+
+ // no keystream yet
+ legic_prng_init(0);
+
+ // send IV handshake
+ frame_sendAsReader(iv, 7);
- legic_prng_init(0); /* no keystream yet */
- frame_send_rwd(iv, 7);
+ // Now both tag and reader has same IV. Prng can start.
legic_prng_init(iv);
frame_clean(¤t_frame);
- frame_receive_rwd(¤t_frame, 6, 1);
- legic_prng_forward(3); /* we wait anyways */
- while(timer->TC_CV < 387) ; /* ~ 258us */
- frame_send_rwd(0x39, 6);
+ frame_receiveAsReader(¤t_frame, 6, 1);
+
+ // fixed delay before sending ack.
+ WAIT(TAG_BIT_PERIOD);
+
+ // Send obsfuscated acknowledgment frame.
+ // 0x19 = 0x18 MIM22, 0x01 LSB READCMD
+ // 0x39 = 0x38 MIM256, MIM1024 0x01 LSB READCMD
+ switch ( current_frame.data ) {
+ case 0x0D:
+ frame_sendAsReader(0x19, 6);
+ break;
+ case 0x1D:
+ case 0x3D:
+ frame_sendAsReader(0x39, 6);
+ break;
+ default:
+ break;
+ }
return current_frame.data;
+
+ // End of Setup Phase.
}
-static void LegicCommonInit(void) {
+static void LegicCommonInit(void) {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
FpgaSetupSsc();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
/* Bitbang the transmitter */
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ LOW(GPIO_SSC_DOUT);
AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
- setup_timer();
+ // reserve a cardmem, meaning we can use the tracelog function in bigbuff easier.
+ cardmem = BigBuf_malloc(LEGIC_CARD_MEMSIZE);
+ memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
+
+ clear_trace();
+ set_tracing(TRUE);
crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
+
+ StartCountUS();
}
/* Switch off carrier, make sure tag is reset */
-static void switch_off_tag_rwd(void)
-{
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+static void switch_off_tag_rwd(void) {
+ LOW(GPIO_SSC_DOUT);
SpinDelay(10);
WDT_HIT();
}
-/* calculate crc for a legic command */
-static int LegicCRC(int byte_index, int value, int cmd_sz) {
- crc_clear(&legic_crc);
- crc_update(&legic_crc, 1, 1); /* CMD_READ */
- crc_update(&legic_crc, byte_index, cmd_sz-1);
- crc_update(&legic_crc, value, 8);
+
+// calculate crc4 for a legic READ command
+// 5,8,10 address size.
+static int LegicCRC(uint16_t byte_index, uint8_t value, uint8_t cmd_sz) {
+ crc_clear(&legic_crc);
+ uint32_t temp = (value << cmd_sz) | (byte_index << 1) | LEGIC_READ;
+ crc_update(&legic_crc, temp, cmd_sz + 8 );
+ // crc_update(&legic_crc, LEGIC_READ, 1);
+ // crc_update(&legic_crc, byte_index, cmd_sz-1);
+ // crc_update(&legic_crc, value, 8);
return crc_finish(&legic_crc);
}
int legic_read_byte(int byte_index, int cmd_sz) {
- int byte;
- while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */
+ int calcCrc = 0;
+ uint8_t byte = 0, crc = 0;
+ uint32_t cmd = (byte_index << 1) | LEGIC_READ;
+
+ legic_prng_forward(3);
+ WAIT(300)
+
+ frame_sendAsReader(cmd, cmd_sz);
- frame_send_rwd(1 | (byte_index << 1), cmd_sz);
frame_clean(¤t_frame);
- frame_receive_rwd(¤t_frame, 12, 1);
+ frame_receiveAsReader(¤t_frame, 12, 1);
byte = current_frame.data & 0xff;
+ calcCrc = LegicCRC(byte_index, byte, cmd_sz);
+ crc = (current_frame.data >> 8);
- if( LegicCRC(byte_index, byte, cmd_sz) != (current_frame.data >> 8) ) {
- Dbprintf("!!! crc mismatch: expected %x but got %x !!!",
- LegicCRC(byte_index, current_frame.data & 0xff, cmd_sz),
- current_frame.data >> 8);
+ if( calcCrc != crc ) {
+ Dbprintf("!!! crc mismatch: expected %x but got %x !!!", calcCrc, crc);
return -1;
}
- legic_prng_forward(4); /* we wait anyways */
return byte;
}
-/* legic_write_byte() is not included, however it's trivial to implement
- * and here are some hints on what remains to be done:
- *
- * * assemble a write_cmd_frame with crc and send it
- * * wait until the tag sends back an ACK ('1' bit unencrypted)
- * * forward the prng based on the timing
+/*
+ * - assemble a write_cmd_frame with crc and send it
+ * - wait until the tag sends back an ACK ('1' bit unencrypted)
+ * - forward the prng based on the timing
*/
//int legic_write_byte(int byte, int addr, int addr_sz, int PrngCorrection) {
int legic_write_byte(int byte, int addr, int addr_sz) {
- //do not write UID, CRC
- if(addr <= 0x04) {
- return 0;
- }
- //== send write command ==============================
+
+ //do not write UID, CRC at offset 0-4.
+ if(addr <= 0x04) return 0;
+
+ // crc
crc_clear(&legic_crc);
crc_update(&legic_crc, 0, 1); /* CMD_WRITE */
crc_update(&legic_crc, addr, addr_sz);
crc_update(&legic_crc, byte, 8);
-
uint32_t crc = crc_finish(&legic_crc);
+
+ // send write command
uint32_t cmd = ((crc <<(addr_sz+1+8)) //CRC
|(byte <<(addr_sz+1)) //Data
|(addr <<1) //Address
uint32_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd
legic_prng_forward(2); /* we wait anyways */
+
while(timer->TC_CV < 387) ; /* ~ 258us */
- frame_send_rwd(cmd, cmd_sz);
+
+ frame_sendAsReader(cmd, cmd_sz);
+
+// wllm-rbnt doesnt have these
+// AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+// AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ // wait for ack
+ int t, old_level = 0, edges = 0;
+ int next_bit_at = 0;
- //== wait for ack ====================================
- int t, old_level=0, edges=0;
- int next_bit_at =0;
while(timer->TC_CV < 387) ; /* ~ 258us */
- for(t=0; t<80; t++) {
+
+ for( t = 0; t < 80; t++) {
edges = 0;
- next_bit_at += TAG_TIME_BIT;
+ next_bit_at += TAG_BIT_PERIOD;
while(timer->TC_CV < next_bit_at) {
int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
if(level != old_level) {
}
if(edges > 20 && edges < 60) { /* expected are 42 edges */
int t = timer->TC_CV;
- int c = t/TAG_TIME_BIT;
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
+ int c = t / TAG_BIT_PERIOD;
+
+ ResetClock();
legic_prng_forward(c);
return 0;
}
}
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
+
+ ResetClock();
return -1;
}
int LegicRfReader(int offset, int bytes, int iv) {
- // ice_legic_setup();
- // ice_legic_select_card();
- // return 0;
-
- int byte_index=0, cmd_sz=0, card_sz=0;
-
- iv = (iv <= 0 ) ? SESSION_IV : iv;
+ int byte_index = 0, cmd_sz = 0, card_sz = 0;
+ if ( MF_DBGLEVEL >= 2) Dbprintf("setting up legic card, IV = %x", iv);
+
LegicCommonInit();
- uint8_t *BigBuf = BigBuf_get_addr();
- memset(BigBuf, 0, 1024);
-
- DbpString("setting up legic card");
uint32_t tag_type = perform_setup_phase_rwd(iv);
- switch_off_tag_rwd(); //we lose to mutch time with dprintf
+
+ //we lose to mutch time with dprintf
+ switch_off_tag_rwd();
+
switch(tag_type) {
case 0x0d:
- DbpString("MIM22 card found, reading card ...");
+ if ( MF_DBGLEVEL >= 2) DbpString("MIM22 card found, reading card ...");
cmd_sz = 6;
card_sz = 22;
break;
case 0x1d:
- DbpString("MIM256 card found, reading card ...");
+ if ( MF_DBGLEVEL >= 2) DbpString("MIM256 card found, reading card ...");
cmd_sz = 9;
card_sz = 256;
break;
case 0x3d:
- DbpString("MIM1024 card found, reading card ...");
+ if ( MF_DBGLEVEL >= 2) DbpString("MIM1024 card found, reading card ...");
cmd_sz = 11;
card_sz = 1024;
break;
default:
- Dbprintf("Unknown card format: %x",tag_type);
- return -1;
+ if ( MF_DBGLEVEL >= 1) Dbprintf("Unknown card format: %x",tag_type);
+ return 1;
}
if(bytes == -1)
bytes = card_sz;
if(bytes+offset >= card_sz)
- bytes = card_sz-offset;
+ bytes = card_sz - offset;
+ // Start setup and read bytes.
perform_setup_phase_rwd(iv);
- legic_prng_forward(2);
-
LED_B_ON();
- while(byte_index < bytes) {
+ while (byte_index < bytes) {
int r = legic_read_byte(byte_index+offset, cmd_sz);
- if(r == -1 ||BUTTON_PRESS()) {
- DbpString("operation aborted");
- switch_off_tag_rwd();
- LED_B_OFF();
- LED_C_OFF();
- return -1;
+
+ if (r == -1 || BUTTON_PRESS()) {
+ switch_off_tag_rwd();
+ LEDsoff();
+ if ( MF_DBGLEVEL >= 2) DbpString("operation aborted");
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ return 1;
}
- BigBuf[byte_index] = r;
+ cardmem[byte_index] = r;
WDT_HIT();
- byte_index++;
- if (byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
+ byte_index++;
}
- LED_B_OFF();
- LED_C_OFF();
+
switch_off_tag_rwd();
- Dbprintf("Card read, use 'hf legic decode' or");
- Dbprintf("'data hexsamples %d' to view results", (bytes+7) & ~7);
+ LEDsoff();
+ uint8_t len = (bytes & 0x3FF);
+ cmd_send(CMD_ACK,1,len,0,0,0);
return 0;
}
int byte_index=0;
LED_B_ON();
- perform_setup_phase_rwd(SESSION_IV);
+ perform_setup_phase_rwd(iv);
//legic_prng_forward(2);
while(byte_index < bytes) {
int r;
void LegicRfWriter(int offset, int bytes, int iv) {
- int byte_index=0, addr_sz=0;
- uint8_t *BigBuf = BigBuf_get_addr();
- iv = (iv <=0 ) ? SESSION_IV : iv;
+ int byte_index = 0, addr_sz = 0;
LegicCommonInit();
- DbpString("setting up legic card");
+ if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
+
uint32_t tag_type = perform_setup_phase_rwd(iv);
+
switch_off_tag_rwd();
+
switch(tag_type) {
case 0x0d:
if(offset+bytes > 22) {
return;
}
addr_sz = 5;
- Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
break;
case 0x1d:
if(offset+bytes > 0x100) {
return;
}
addr_sz = 8;
- Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
break;
case 0x3d:
if(offset+bytes > 0x400) {
return;
}
addr_sz = 10;
- Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset+bytes);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset+bytes);
break;
default:
Dbprintf("No or unknown card found, aborting");
return;
}
-#if 1
LED_B_ON();
perform_setup_phase_rwd(iv);
while(byte_index < bytes) {
//check if the DCF should be changed
if ( ((byte_index+offset) == 0x05) && (bytes >= 0x02) ) {
//write DCF in reverse order (addr 0x06 before 0x05)
- r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz);
+ r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), addr_sz);
// write second byte on success...
if(r == 0) {
byte_index++;
- r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz);
+ r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), addr_sz);
}
}
else {
- r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz);
+ r = legic_write_byte(cardmem[byte_index+offset], byte_index+offset, addr_sz);
}
+
if((r != 0) || BUTTON_PRESS()) {
Dbprintf("operation aborted @ 0x%03.3x", byte_index);
switch_off_tag_rwd();
- LED_B_OFF();
- LED_C_OFF();
+ LEDsoff();
return;
}
WDT_HIT();
byte_index++;
- if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
}
- LED_B_OFF();
- LED_C_OFF();
- DbpString("write successful");
-#else
- for(byte_index = -2; byte_index < 200; byte_index++)
- {
- Dbprintf("+ Try RndValue %d...", byte_index);
- if(_LegicRfWriter(bytes, offset, addr_sz, BigBuf, byte_index) == 0)
- break;
- }
-#endif
-
+ LEDsoff();
+ if ( MF_DBGLEVEL >= 1) DbpString("write successful");
}
void LegicRfRawWriter(int address, int byte, int iv) {
- int byte_index=0, addr_sz=0;
-
- iv = (iv <= 0) ? SESSION_IV : iv;
+
+ int byte_index = 0, addr_sz = 0;
LegicCommonInit();
- DbpString("setting up legic card");
+ if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
+
uint32_t tag_type = perform_setup_phase_rwd(iv);
+
switch_off_tag_rwd();
+
switch(tag_type) {
case 0x0d:
if(address > 22) {
return;
}
addr_sz = 5;
- Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
break;
case 0x1d:
if(address > 0x100) {
return;
}
addr_sz = 8;
- Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
break;
case 0x3d:
if(address > 0x400) {
return;
}
addr_sz = 10;
- Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte);
+ if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte);
break;
default:
Dbprintf("No or unknown card found, aborting");
return;
}
+
Dbprintf("integer value: %d address: %d addr_sz: %d", byte, address, addr_sz);
LED_B_ON();
+
perform_setup_phase_rwd(iv);
//legic_prng_forward(2);
if((r != 0) || BUTTON_PRESS()) {
Dbprintf("operation aborted @ 0x%03.3x (%1d)", byte_index, r);
switch_off_tag_rwd();
- LED_B_OFF();
- LED_C_OFF();
+ LEDsoff();
return;
}
-
- LED_B_OFF();
- LED_C_OFF();
- DbpString("write successful");
-}
-int timestamp;
+ LEDsoff();
+ if ( MF_DBGLEVEL >= 1) DbpString("write successful");
+}
-/* Handle (whether to respond) a frame in tag mode */
+/* Handle (whether to respond) a frame in tag mode
+ * Only called when simulating a tag.
+ */
static void frame_handle_tag(struct legic_frame const * const f)
{
uint8_t *BigBuf = BigBuf_get_addr();
/* First Part of Handshake (IV) */
if(f->bits == 7) {
-// if(f->data == SESSION_IV) {
+
LED_C_ON();
- prng_timer->TC_CCR = AT91C_TC_SWTRG;
+
+ // Reset prng timer
+ Reset(prng_timer);
+
legic_prng_init(f->data);
- frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1b */
+ frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1B */
legic_state = STATE_IV;
legic_read_count = 0;
legic_prng_bc = 0;
legic_prng_iv = f->data;
/* TIMEOUT */
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1);
- while(timer->TC_CV < 280);
+ ResetClock();
+
+ //while(timer->TC_CV < 280);
+ WAIT(280)
return;
-// } else if((prng_timer->TC_CV % 50) > 40) {
-// legic_prng_init(f->data);
-// frame_send_tag(0x3d, 6, 1);
-// SpinDelay(20);
-// return;
-// }
}
/* 0x19==??? */
legic_state = STATE_CON;
/* TIMEOUT */
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1);
- while(timer->TC_CV < 200);
+ ResetClock();
+
+ //while(timer->TC_CV < 200);
+ WAIT(200)
+
return;
} else {
legic_state = STATE_DISCON;
frame_send_tag(hash | data, 12, 1);
- /* SHORT TIMEOUT */
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1);
+ /* TIMEOUT */
+ ResetClock();
+
legic_prng_forward(2);
- while(timer->TC_CV < 180);
+ //while(timer->TC_CV < 180);
+ WAIT(180)
+
return;
}
}
/* Read bit by bit untill full frame is received
* Call to process frame end answer
*/
-static void emit(int bit)
-{
- if(bit == -1) {
- if(current_frame.bits <= 4) {
- frame_clean(¤t_frame);
- } else {
- frame_handle_tag(¤t_frame);
- frame_clean(¤t_frame);
- }
- WDT_HIT();
- } else if(bit == 0) {
- frame_append_bit(¤t_frame, 0);
- } else if(bit == 1) {
- frame_append_bit(¤t_frame, 1);
- }
+static void emit(int bit) {
+
+ switch (bit) {
+ case 1:
+ frame_append_bit(¤t_frame, 1);
+ break;
+ case 0:
+ frame_append_bit(¤t_frame, 0);
+ break;
+ default:
+ if(current_frame.bits <= 4) {
+ frame_clean(¤t_frame);
+ } else {
+ frame_handle_tag(¤t_frame);
+ frame_clean(¤t_frame);
+ }
+ WDT_HIT();
+ break;
+ }
}
void LegicRfSimulate(int phase, int frame, int reqresp)
* seems to be 300us-ish.
*/
-// if(phase < 0) {
-// int i;
-// for(i=0; i<=reqresp; i++) {
-// legic_prng_init(SESSION_IV);
-// Dbprintf("i=%u, key 0x%3.3x", i, get_key_stream(i, frame));
-// }
-// return;
-// }
-
- legic_phase_drift = phase;
- legic_frame_drift = frame;
- legic_reqresp_drift = reqresp;
-
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- 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;
-
- setup_timer();
- crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
+ legic_phase_drift = phase;
+ legic_frame_drift = frame;
+ legic_reqresp_drift = reqresp;
+
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ 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;
+
+ //setup_timer();
+ crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
+
+ int old_level = 0;
+ int active = 0;
+ legic_state = STATE_DISCON;
+
+ LED_B_ON();
+ DbpString("Starting Legic emulator, press button to end");
- int old_level = 0;
- int active = 0;
- legic_state = STATE_DISCON;
-
- LED_B_ON();
- DbpString("Starting Legic emulator, press button to end");
- while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
- 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(1);
- active = 1;
- LED_A_ON();
- } else if(FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {
- /* 0 bit */
- emit(0);
- active = 1;
- LED_A_ON();
- } else if(active) {
- /* invalid */
- emit(-1);
- active = 0;
- LED_A_OFF();
- }
- }
- }
+ while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
+ int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+ int time = timer->TC_CV;
- if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
- /* Frame end */
- emit(-1);
- active = 0;
- LED_A_OFF();
- }
-
- if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
- timer->TC_CCR = AT91C_TC_CLKDIS;
- }
-
- old_level = level;
- WDT_HIT();
- }
- DbpString("Stopped");
- LED_B_OFF();
- LED_A_OFF();
- LED_C_OFF();
-}
+ 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(1);
+ active = 1;
+ LED_A_ON();
+ } else if (FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {
+ /* 0 bit */
+ emit(0);
+ active = 1;
+ LED_A_ON();
+ } else if (active) {
+ /* invalid */
+ emit(-1);
+ active = 0;
+ LED_A_OFF();
+ }
+ }
+ }
+
+ /* Frame end */
+ if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
+ emit(-1);
+ active = 0;
+ LED_A_OFF();
+ }
+
+ if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
+ timer->TC_CCR = AT91C_TC_CLKDIS;
+ }
+ old_level = level;
+ WDT_HIT();
+ }
+ if ( MF_DBGLEVEL >= 1) DbpString("Stopped");
+ LEDsoff();
+}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// }
-static void UartReset()
-{
- Uart.byteCntMax = MAX_FRAME_SIZE;
+static void UartReset() {
+ Uart.byteCntMax = 3;
Uart.state = STATE_UNSYNCD;
Uart.byteCnt = 0;
Uart.bitCnt = 0;
Uart.posCnt = 0;
- memset(Uart.output, 0x00, MAX_FRAME_SIZE);
+ memset(Uart.output, 0x00, 3);
}
-// static void UartInit(uint8_t *data)
-// {
+// static void UartInit(uint8_t *data) {
// Uart.output = data;
// UartReset();
// }
Demod.bitCount = 0;
Demod.thisBit = 0;
Demod.shiftReg = 0;
- memset(Demod.output, 0x00, MAX_FRAME_SIZE);
+ memset(Demod.output, 0x00, 3);
}
static void DemodInit(uint8_t *data) {
uint8_t wakeup[] = { 0x7F };
uint8_t getid[] = {0x19};
- legic_prng_init(SESSION_IV);
+ //legic_prng_init(SESSION_IV);
// first, wake up the tag, 7bits
CodeAndTransmitLegicAsReader(wakeup, sizeof(wakeup), 7);
GetSamplesForLegicDemod(1000, TRUE);
// frame_clean(¤t_frame);
- //frame_receive_rwd(¤t_frame, 6, 1);
+ //frame_receiveAsReader(¤t_frame, 6, 1);
legic_prng_forward(1); /* we wait anyways */
//while(timer->TC_CV < 387) ; /* ~ 258us */
- //frame_send_rwd(0x19, 6);
+ //frame_sendAsReader(0x19, 6);
CodeAndTransmitLegicAsReader(getid, sizeof(getid), 8);
GetSamplesForLegicDemod(1000, TRUE);
// Signal field is on with the appropriate LED
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
- SpinDelay(200);
+ SpinDelay(20);
// Start the timer
//StartCountSspClk();
projects / proxmark3-svn / blobdiff