//-----------------------------------------------------------------------------
// (c) 2009 Henryk Plötz <henryk@ploetzli.ch>
+// 2016 Iceman
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
//-----------------------------------------------------------------------------
// 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;
+ uint8_t bits;
uint32_t data;
} current_frame;
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_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_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 */
+ AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
+ AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
+
+ // fast clock
+ AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
+ AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz)/32 -- tick=1.5mks
+ AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_ACPA_CLEAR |
+ AT91C_TC_ACPC_SET | AT91C_TC_ASWTRG_SET;
+ AT91C_BASE_TC0->TC_RA = 1;
+ AT91C_BASE_TC0->TC_RC = 0xBFFF + 1; // 0xC000
+
+*/
+
+// At TIMER_CLOCK3 (MCK/32)
+// testing calculating in ticks. 1.5ticks = 1us
+#define RWD_TIME_1 120 // READER_TIME_PAUSE 20us off, 80us on = 100us 80 * 1.5 == 120ticks
+#define RWD_TIME_0 60 // READER_TIME_PAUSE 20us off, 40us on = 60us 40 * 1.5 == 60ticks
+#define RWD_TIME_PAUSE 30 // 20us == 20 * 1.5 == 30ticks */
+#define TAG_BIT_PERIOD 142 // 100us == 100 * 1.5 == 150ticks
+#define TAG_FRAME_WAIT 495 // 330us from READER frame end to TAG frame start. 330 * 1.5 == 495
+
+#define RWD_TIME_FUZZ 20 // rather generous 13us, since the peak detector + hysteresis fuzz quite a bit
#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 SHORT_COIL LOW(GPIO_SSC_DOUT);
+#endif
+#ifndef OPEN_COIL
+# define OPEN_COIL HIGH(GPIO_SSC_DOUT);
+#endif
+#ifndef LINE_IN
+# define LINE_IN AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+#endif
+// Pause pulse, off in 20us / 30ticks,
+// ONE / ZERO bit pulse,
+// one == 80us / 120ticks
+// zero == 40us / 60ticks
+#ifndef COIL_PULSE
+# define COIL_PULSE(x) \
+ do { \
+ SHORT_COIL; \
+ WaitTicks( (RWD_TIME_PAUSE) ); \
+ OPEN_COIL; \
+ WaitTicks((x)); \
+ } while (0);
+#endif
+
+// 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;
+
+static void frame_append_bit(struct legic_frame * const f, uint8_t 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) {
+ f->data = 0;
+ f->bits = 0;
+}
+
+// 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 - sendFrameStop) / 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 get_key_stream(int skip, int count) {
- /* Use int to enlarge timer tc to 32bit */
+ int i;
+
+ // 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.
/* 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;
-
/* Generate KeyStream */
- for(i=0; i<count; i++) {
- key |= legic_prng_get_bit() << i;
- legic_prng_forward(1);
- }
- return key;
+ return legic_prng_get_bits(count);
}
/* 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;
- }
+void frame_send_tag(uint16_t response, uint8_t bits) {
+
+ uint16_t mask = 1;
+
+ /* Bitbang the response */
+ SHORT_COIL;
+ AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
+
+ /* TAG_FRAME_WAIT -> shift by 2 */
+ legic_prng_forward(3);
+ response ^= legic_prng_get_bits(bits);
+
+ /* Wait for the frame start */
+ WaitTicks( TAG_FRAME_WAIT );
- /* 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) ;
+ for (; mask < BITMASK(bits); mask <<= 1) {
+ if (response & mask)
+ OPEN_COIL
+ else
+ SHORT_COIL
+ WaitTicks(TAG_BIT_PERIOD);
}
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ SHORT_COIL;
}
/* 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 */
+void frame_sendAsReader(uint32_t data, uint8_t bits){
- 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;
+ uint32_t starttime = GET_TICKS, send = 0, mask = 1;
+
+ // xor lsfr onto data.
+ send = data ^ legic_prng_get_bits(bits);
+
+ for (; mask < BITMASK(bits); mask <<= 1) {
+ if (send & mask)
+ COIL_PULSE(RWD_TIME_1)
else
- bit_end = starttime + RWD_TIME_0;
-
-
- /* 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 */
-
- while(timer->TC_CV < bit_end);
+ 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 */
+ // Final pause to mark the end of the frame
+ COIL_PULSE(0);
+
+ // log
+ uint8_t cmdbytes[] = {bits, BYTEx(data,0), BYTEx(data,1), BYTEx(data,2), BYTEx(send,0), BYTEx(send,1), BYTEx(send,2)};
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, 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) {
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
-
- /* we have some time now, precompute the cipher
- * since we cannot compute it on the fly while reading */
+ if ( bits > 32 ) return;
+
+ uint8_t i = bits, edges = 0;
+ uint32_t the_bit = 1, next_bit_at = 0, data = 0;
+ uint32_t old_level = 0;
+ volatile uint32_t level = 0;
+
+ frame_clean(f);
+
+ // calibrate the prng.
legic_prng_forward(2);
+ data = legic_prng_get_bits(bits);
+
+ //FIXED time between sending frame and now listening frame. 330us
+ uint32_t starttime = GET_TICKS;
+ // its about 9+9 ticks delay from end-send to here.
+ WaitTicks( 477 );
- if(crypt) {
- for(i=0; i<bits; i++) {
- data |= legic_prng_get_bit() << i;
- legic_prng_forward(1);
- }
- }
-
- while(timer->TC_CV < next_bit_at) ;
-
- next_bit_at += TAG_TIME_BIT;
+ next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
- for(i=0; i<bits; i++) {
+ while ( i-- ){
edges = 0;
- while(timer->TC_CV < next_bit_at) {
- int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
- if(level != old_level)
- edges++;
+ while ( GET_TICKS < 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 )
data ^= the_bit;
- }
- the_bit <<= 1;
+
+ the_bit <<= 1;
}
+ // output
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 */
-}
-
-static void frame_append_bit(struct legic_frame * const f, int bit)
-{
- if (f->bits >= 31)
- return; /* Overflow, won't happen */
-
- f->data |= (bit << f->bits);
- f->bits++;
-}
-
-static void frame_clean(struct legic_frame * const f)
-{
- f->data = 0;
- f->bits = 0;
+
+ // log
+ uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)};
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
}
-static uint32_t perform_setup_phase_rwd(int iv)
-{
-
- /* Switch on carrier and let the tag charge for 1ms */
- AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
- SpinDelay(1);
+// Setup pm3 as a Legic Reader
+static uint32_t setup_phase_reader(uint8_t iv) {
+
+ // Switch on carrier and let the tag charge for 5ms
+ HIGH(GPIO_SSC_DOUT);
+ WaitUS(5000);
+
+ ResetTicks();
+
+ legic_prng_init(0);
+
+ // send IV handshake
+ frame_sendAsReader(iv, 7);
- legic_prng_init(0); /* no keystream yet */
- frame_send_rwd(iv, 7);
+ // tag and reader has same IV.
legic_prng_init(iv);
- frame_clean(¤t_frame);
- frame_receive_rwd(¤t_frame, 6, 1);
- legic_prng_forward(1); /* we wait anyways */
- while(timer->TC_CV < 387) ; /* ~ 258us */
- frame_send_rwd(0x19, 6);
+ frame_receiveAsReader(¤t_frame, 6);
+
+ // 292us (438t) - fixed delay before sending ack.
+ // minus log and stuff 100tick?
+ WaitTicks(338);
+ legic_prng_forward(3);
+
+ // 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;
+ }
+ legic_prng_forward(2);
return current_frame.data;
}
-static void LegicCommonInit(void) {
+void LegicCommonInit(bool clear_mem) {
+
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
/* Bitbang the transmitter */
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+ SHORT_COIL;
AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
+ AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+
+ // reserve a cardmem, meaning we can use the tracelog function in bigbuff easier.
+ cardmem = BigBuf_get_EM_addr();
+ if ( clear_mem )
+ memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
- setup_timer();
-
+ clear_trace();
+ set_tracing(TRUE);
crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
+
+ StartTicks();
}
-/* Switch off carrier, make sure tag is reset */
-static void switch_off_tag_rwd(void)
-{
- AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
- SpinDelay(10);
+// Switch off carrier, make sure tag is reset
+static void switch_off_tag_rwd(void) {
+ SHORT_COIL;
+ WaitUS(20);
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
+static uint32_t legic4Crc(uint8_t cmd, uint16_t byte_index, uint8_t value, uint8_t cmd_sz) {
+ crc_clear(&legic_crc);
+ uint32_t temp = (value << cmd_sz) | (byte_index << 1) | cmd;
+ crc_update(&legic_crc, temp, cmd_sz + 8 );
return crc_finish(&legic_crc);
}
-int legic_read_byte(int byte_index, int cmd_sz) {
- int byte;
+int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
- legic_prng_forward(4); /* we wait anyways */
- while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */
-
- frame_send_rwd(1 | (byte_index << 1), cmd_sz);
- frame_clean(¤t_frame);
-
- frame_receive_rwd(¤t_frame, 12, 1);
+ uint8_t byte, crc, calcCrc = 0;
+ uint32_t cmd = (index << 1) | LEGIC_READ;
+
+ // 90ticks = 60us (should be 100us but crc calc takes time.)
+ //WaitTicks(330); // 330ticks prng(4) - works
+ WaitTicks(240); // 240ticks prng(3) - works
+
+ frame_sendAsReader(cmd, cmd_sz);
+ frame_receiveAsReader(¤t_frame, 12);
- byte = current_frame.data & 0xff;
+ // CRC check.
+ byte = BYTEx(current_frame.data, 0);
+ crc = BYTEx(current_frame.data, 1);
+ calcCrc = legic4Crc(LEGIC_READ, index, byte, cmd_sz);
- 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: %x != %x !!!", calcCrc, crc);
return -1;
}
+ legic_prng_forward(3);
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 ==============================
- 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);
- uint32_t cmd = ((crc <<(addr_sz+1+8)) //CRC
- |(byte <<(addr_sz+1)) //Data
- |(addr <<1) //Address
- |(0x00 <<0)); //CMD = W
- uint32_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd
-
- legic_prng_forward(4); /* we wait anyways */
- while(timer->TC_CV < 387) ; /* ~ 258us */
- frame_send_rwd(cmd, cmd_sz);
+bool legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ bool isOK = false;
+ int8_t i = 40;
+ uint8_t edges = 0;
+ uint8_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd;
+ uint32_t steps = 0, next_bit_at, start, crc, old_level = 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++) {
+ crc = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
+
+ // send write command
+ uint32_t cmd = LEGIC_WRITE;
+ cmd |= index << 1; // index
+ cmd |= byte << (addr_sz+1); // Data
+ cmd |= (crc & 0xF ) << (addr_sz+1+8); // CRC
+
+ WaitTicks(240);
+
+ frame_sendAsReader(cmd, cmd_sz);
+
+ LINE_IN;
+
+ start = GET_TICKS;
+
+ // ACK, - one single "1" bit after 3.6ms
+ // 3.6ms = 3600us * 1.5 = 5400ticks.
+ WaitTicks(5400);
+
+ next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
+
+ while ( i-- ) {
+ WDT_HIT();
edges = 0;
- next_bit_at += TAG_TIME_BIT;
- while(timer->TC_CV < next_bit_at) {
- int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
- if(level != old_level) {
- edges++;
- }
+ while ( GET_TICKS < next_bit_at) {
+
+ volatile uint32_t level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+
+ if (level != old_level)
+ ++edges;
+
old_level = 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 */
- legic_prng_forward(c-1);
- return 0;
+
+ next_bit_at += TAG_BIT_PERIOD;
+
+ // We expect 42 edges (ONE)
+ if(edges > 20 ) {
+ steps = ( (GET_TICKS - start) / TAG_BIT_PERIOD);
+ legic_prng_forward(steps);
+ isOK = true;
+ goto OUT;
}
}
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
- return -1;
+
+OUT: ;
+ legic_prng_forward(1);
+
+ uint8_t cmdbytes[] = {1, isOK, BYTEx(steps, 0), BYTEx(steps, 1) };
+ LogTrace(cmdbytes, sizeof(cmdbytes), start, GET_TICKS, NULL, FALSE);
+ return isOK;
}
-int LegicRfReader(int offset, int bytes) {
+int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
- // ice_legic_setup();
- // ice_legic_select_card();
- // return 0;
+ uint16_t i = 0;
+ uint8_t isOK = 1;
+ legic_card_select_t card;
- int byte_index=0, cmd_sz=0, card_sz=0;
-
- LegicCommonInit();
-
- uint8_t *BigBuf = BigBuf_get_addr();
- memset(BigBuf, 0, 1024);
-
- DbpString("setting up legic card");
- uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV);
- switch_off_tag_rwd(); //we lose to mutch time with dprintf
- switch(tag_type) {
- case 0x0d:
- DbpString("MIM22 card found, reading card ...");
- cmd_sz = 6;
- card_sz = 22;
- break;
- case 0x1d:
- DbpString("MIM256 card found, reading card ...");
- cmd_sz = 9;
- card_sz = 256;
- break;
- case 0x3d:
- DbpString("MIM1024 card found, reading card ...");
- cmd_sz = 11;
- card_sz = 1024;
- break;
- default:
- Dbprintf("Unknown card format: %x",tag_type);
- return -1;
+ LegicCommonInit(TRUE);
+
+ if ( legic_select_card_iv(&card, iv) ) {
+ isOK = 0;
+ goto OUT;
}
- if(bytes == -1)
- bytes = card_sz;
-
- if(bytes+offset >= card_sz)
- bytes = card_sz-offset;
- perform_setup_phase_rwd(SESSION_IV);
+ if (len + offset > card.cardsize)
+ len = card.cardsize - offset;
LED_B_ON();
- 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;
+ while (i < len) {
+ int r = legic_read_byte(offset + i, card.cmdsize);
+
+ if (r == -1 || BUTTON_PRESS()) {
+ if ( MF_DBGLEVEL >= 2) DbpString("operation aborted");
+ isOK = 0;
+ goto OUT;
}
- BigBuf[byte_index] = r;
+ cardmem[i++] = r;
WDT_HIT();
- byte_index++;
- if (byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
}
- LED_B_OFF();
- LED_C_OFF();
+
+OUT:
+ WDT_HIT();
switch_off_tag_rwd();
- Dbprintf("Card read, use 'hf legic decode' or");
- Dbprintf("'data hexsamples %d' to view results", (bytes+7) & ~7);
+ LEDsoff();
+ cmd_send(CMD_ACK, isOK, len, 0, cardmem, len);
return 0;
}
-/*int _LegicRfWriter(int bytes, int offset, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) {
- int byte_index=0;
-
- LED_B_ON();
- perform_setup_phase_rwd(SESSION_IV);
- //legic_prng_forward(2);
- while(byte_index < bytes) {
- int r;
-
- //check if the DCF should be changed
- if ( (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, RoundBruteforceValue);
- //legic_prng_forward(1);
- if(r == 0) {
- byte_index++;
- r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue);
- }
- //legic_prng_forward(1);
- }
- else {
- r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz, RoundBruteforceValue);
- }
- if((r != 0) || BUTTON_PRESS()) {
- Dbprintf("operation aborted @ 0x%03.3x", byte_index);
- switch_off_tag_rwd();
- LED_B_OFF();
- LED_C_OFF();
- return -1;
- }
+void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
- WDT_HIT();
- byte_index++;
- if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
+ #define LOWERLIMIT 4
+ uint8_t isOK = 1, msg = 0;
+ legic_card_select_t card;
+
+ // uid NOT is writeable.
+ if ( offset <= LOWERLIMIT ) {
+ isOK = 0;
+ goto OUT;
}
- LED_B_OFF();
- LED_C_OFF();
- DbpString("write successful");
- return 0;
-}*/
+
+ LegicCommonInit(TRUE);
+
+ if ( legic_select_card_iv(&card, iv) ) {
+ isOK = 0;
+ msg = 1;
+ goto OUT;
+ }
+
+ if ( len + offset > card.cardsize)
+ len = card.cardsize - offset;
+
+ LED_B_ON();
+ while( len > 0 ) {
+ --len;
+ if ( !legic_write_byte( len + offset, data[len], card.addrsize) ) {
+ Dbprintf("operation failed | %02X | %02X | %02X", len + offset, len, data[len] );
+ isOK = 0;
+ goto OUT;
+ }
+ WDT_HIT();
+ }
+OUT:
+ cmd_send(CMD_ACK, isOK, msg,0,0,0);
+ switch_off_tag_rwd();
+ LEDsoff();
+}
-void LegicRfWriter(int bytes, int offset) {
- int byte_index=0, addr_sz=0;
- uint8_t *BigBuf = BigBuf_get_addr();
+int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){
- LegicCommonInit();
+ if ( p_card == NULL ) return 1;
- DbpString("setting up legic card");
- uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV);
- switch_off_tag_rwd();
- switch(tag_type) {
+ p_card->tagtype = setup_phase_reader(iv);
+
+ switch(p_card->tagtype) {
case 0x0d:
- if(offset+bytes > 22) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset+bytes);
- return;
- }
- addr_sz = 5;
- Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
+ p_card->cmdsize = 6;
+ p_card->addrsize = 5;
+ p_card->cardsize = 22;
break;
case 0x1d:
- if(offset+bytes > 0x100) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset+bytes);
- return;
- }
- addr_sz = 8;
- Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes);
+ p_card->cmdsize = 9;
+ p_card->addrsize = 8;
+ p_card->cardsize = 256;
break;
case 0x3d:
- if(offset+bytes > 0x400) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset+bytes);
- return;
- }
- addr_sz = 10;
- Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset+bytes);
+ p_card->cmdsize = 11;
+ p_card->addrsize = 10;
+ p_card->cardsize = 1024;
break;
- default:
- Dbprintf("No or unknown card found, aborting");
- return;
+ default:
+ p_card->cmdsize = 0;
+ p_card->addrsize = 0;
+ p_card->cardsize = 0;
+ return 2;
}
+ return 0;
+}
+int legic_select_card(legic_card_select_t *p_card){
+ return legic_select_card_iv(p_card, 0x01);
+}
+
+//-----------------------------------------------------------------------------
+// Work with emulator memory
+//
+// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not
+// involved in dealing with emulator memory. But if it is called later, it might
+// destroy the Emulator Memory.
+//-----------------------------------------------------------------------------
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemSet(uint32_t arg0, uint32_t arg1, uint8_t *data) {
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ legic_emlset_mem(data, arg0, arg1);
+}
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemGet(uint32_t arg0, uint32_t arg1) {
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ uint8_t buf[USB_CMD_DATA_SIZE] = {0x00};
+ legic_emlget_mem(buf, arg0, arg1);
+ LED_B_ON();
+ cmd_send(CMD_ACK, arg0, arg1, 0, buf, USB_CMD_DATA_SIZE);
+ LED_B_OFF();
+}
+void legic_emlset_mem(uint8_t *data, int offset, int numofbytes) {
+ cardmem = BigBuf_get_EM_addr();
+ memcpy(cardmem + offset, data, numofbytes);
+}
+void legic_emlget_mem(uint8_t *data, int offset, int numofbytes) {
+ cardmem = BigBuf_get_EM_addr();
+ memcpy(data, cardmem + offset, numofbytes);
+}
-#if 1
- LED_B_ON();
- perform_setup_phase_rwd(SESSION_IV);
+void LegicRfInfo(void){
- while(byte_index < bytes) {
- int r;
+ int r;
+
+ uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
+ legic_card_select_t *card = (legic_card_select_t*) buf;
+
+ LegicCommonInit(FALSE);
- //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);
+ if ( legic_select_card(card) ) {
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ goto OUT;
+ }
- // write second byte on success...
- if(r == 0) {
- byte_index++;
- r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz);
- }
+ // read UID bytes
+ for ( uint8_t i = 0; i < sizeof(card->uid); ++i) {
+ r = legic_read_byte(i, card->cmdsize);
+ if ( r == -1 ) {
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ goto OUT;
}
- else {
- r = legic_write_byte(BigBuf[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();
- return;
- }
-
- WDT_HIT();
- byte_index++;
- if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
+ card->uid[i] = r & 0xFF;
}
- 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;
+
+ // MCC byte.
+ r = legic_read_byte(4, card->cmdsize);
+ uint32_t calc_mcc = CRC8Legic(card->uid, 4);;
+ if ( r != calc_mcc) {
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ goto OUT;
}
-#endif
+
+ // OK
+ cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t));
+OUT:
+ switch_off_tag_rwd();
+ LEDsoff();
}
-void LegicRfRawWriter(int offset, int byte) {
- int byte_index=0, addr_sz=0;
-
- LegicCommonInit();
-
- DbpString("setting up legic card");
- uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV);
- switch_off_tag_rwd();
- switch(tag_type) {
- case 0x0d:
- if(offset > 22) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset);
- return;
- }
- addr_sz = 5;
- Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte);
- break;
- case 0x1d:
- if(offset > 0x100) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset);
- return;
- }
- addr_sz = 8;
- Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte);
- break;
- case 0x3d:
- if(offset > 0x400) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset);
- return;
- }
- addr_sz = 10;
- Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", offset, byte);
- break;
- default:
- Dbprintf("No or unknown card found, aborting");
- return;
- }
- Dbprintf("integer value: %d offset: %d addr_sz: %d", byte, offset, addr_sz);
- LED_B_ON();
- perform_setup_phase_rwd(SESSION_IV);
- //legic_prng_forward(2);
+/* 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)
+{
+ // log
+ //uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)};
+ //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
+ //Dbprintf("ICE: enter frame_handle_tag: %02x ", f->bits);
+
+ /* First Part of Handshake (IV) */
+ if(f->bits == 7) {
+
+ LED_C_ON();
+
+ // Reset prng timer
+ //ResetTimer(prng_timer);
+ ResetTicks();
+
+ // IV from reader.
+ legic_prng_init(f->data);
- int r = legic_write_byte(byte, offset, addr_sz);
+ Dbprintf("ICE: IV: %02x ", f->data);
- 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();
+ // We should have three tagtypes with three different answers.
+ legic_prng_forward(2);
+ //frame_send_tag(0x3d, 6); /* MIM1024 0x3d^0x26 = 0x1B */
+ frame_send_tag(0x1d, 6); // MIM256
+
+ legic_state = STATE_IV;
+ legic_read_count = 0;
+ legic_prng_bc = 0;
+ legic_prng_iv = f->data;
+
+ //ResetTimer(timer);
+ //WaitUS(280);
+ WaitTicks(388);
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");
-}
-
-int timestamp;
-
-/* Handle (whether to respond) a frame in tag mode */
-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;
- legic_prng_init(f->data);
- 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);
- return;
- } else if((prng_timer->TC_CV % 50) > 40) {
- legic_prng_init(f->data);
- frame_send_tag(0x3d, 6, 1);
- SpinDelay(20);
- return;
- }
- }
/* 0x19==??? */
if(legic_state == STATE_IV) {
- if((f->bits == 6) && (f->data == (0x19 ^ get_key_stream(1, 6)))) {
+ uint32_t local_key = get_key_stream(3, 6);
+ int xored = 0x39 ^ local_key;
+ if((f->bits == 6) && (f->data == xored)) {
legic_state = STATE_CON;
- /* TIMEOUT */
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1);
- while(timer->TC_CV < 200);
+ ResetTimer(timer);
+ WaitTicks(300);
return;
- } else {
+
+ } else {
legic_state = STATE_DISCON;
LED_C_OFF();
- Dbprintf("0x19 - Frame: %03.3x", f->data);
+ Dbprintf("iv: %02x frame: %02x key: %02x xored: %02x", legic_prng_iv, f->data, local_key, xored);
return;
}
}
/* Read */
if(f->bits == 11) {
if(legic_state == STATE_CON) {
- int key = get_key_stream(-1, 11); //legic_phase_drift, 11);
- int addr = f->data ^ key; addr = addr >> 1;
- int data = BigBuf[addr];
- int hash = LegicCRC(addr, data, 11) << 8;
- BigBuf[OFFSET_LOG+legic_read_count] = (uint8_t)addr;
- legic_read_count++;
-
- //Dbprintf("Data:%03.3x, key:%03.3x, addr: %03.3x, read_c:%u", f->data, key, addr, read_c);
- legic_prng_forward(legic_reqresp_drift);
-
- frame_send_tag(hash | data, 12, 1);
-
- /* SHORT TIMEOUT */
- timer->TC_CCR = AT91C_TC_SWTRG;
- while(timer->TC_CV > 1);
- legic_prng_forward(legic_frame_drift);
- while(timer->TC_CV < 180);
+ uint32_t key = get_key_stream(2, 11); //legic_phase_drift, 11);
+ uint16_t addr = f->data ^ key;
+ addr >>= 1;
+ uint8_t data = cardmem[addr];
+
+ uint32_t crc = legic4Crc(LEGIC_READ, addr, data, 11) << 8;
+
+ //legic_read_count++;
+ //legic_prng_forward(legic_reqresp_drift);
+
+ frame_send_tag(crc | data, 12);
+ //ResetTimer(timer);
+ legic_prng_forward(2);
+ WaitTicks(330);
return;
}
}
/* Write */
- if(f->bits == 23) {
- int key = get_key_stream(-1, 23); //legic_frame_drift, 23);
- int addr = f->data ^ key; addr = addr >> 1; addr = addr & 0x3ff;
- int data = f->data ^ key; data = data >> 11; data = data & 0xff;
-
+ if (f->bits == 23 || f->bits == 21 ) {
+ uint32_t key = get_key_stream(-1, 23); //legic_frame_drift, 23);
+ uint16_t addr = f->data ^ key;
+ addr >>= 1;
+ addr &= 0x3ff;
+ uint32_t data = f->data ^ key;
+ data >>= 11;
+ data &= 0xff;
+
+ cardmem[addr] = data;
/* write command */
legic_state = STATE_DISCON;
LED_C_OFF();
Dbprintf("write - addr: %x, data: %x", addr, data);
+ // should send a ACK after 3.6ms
return;
}
if(legic_state != STATE_DISCON) {
Dbprintf("Unexpected: sz:%u, Data:%03.3x, State:%u, Count:%u", f->bits, f->data, legic_state, legic_read_count);
- int i;
Dbprintf("IV: %03.3x", legic_prng_iv);
- for(i = 0; i<legic_read_count; i++) {
- Dbprintf("Read Nb: %u, Addr: %u", i, BigBuf[OFFSET_LOG+i]);
- }
-
- for(i = -1; i<legic_read_count; i++) {
- uint32_t t;
- t = BigBuf[OFFSET_LOG+256+i*4];
- t |= BigBuf[OFFSET_LOG+256+i*4+1] << 8;
- t |= BigBuf[OFFSET_LOG+256+i*4+2] <<16;
- t |= BigBuf[OFFSET_LOG+256+i*4+3] <<24;
-
- Dbprintf("Cycles: %u, Frame Length: %u, Time: %u",
- BigBuf[OFFSET_LOG+128+i],
- BigBuf[OFFSET_LOG+384+i],
- t);
- }
}
- legic_state = STATE_DISCON;
- legic_read_count = 0;
- SpinDelay(10);
- LED_C_OFF();
- return;
+
+ legic_state = STATE_DISCON;
+ legic_read_count = 0;
+ WaitMS(10);
+ LED_C_OFF();
+ 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)
* 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.
+ * seems to be 330us.
*/
+
+ int old_level = 0, active = 0;
+ volatile int32_t level = 0;
+
+ legic_state = STATE_DISCON;
+ legic_phase_drift = phase;
+ legic_frame_drift = frame;
+ legic_reqresp_drift = reqresp;
- 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);
-
- 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();
- }
- }
- }
+ /* to get the stream of bits from FPGA in sim mode.*/
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ // Set up the synchronous serial port
+ //FpgaSetupSsc();
+ // connect Demodulated Signal to ADC:
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
+ //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
- 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();
-}
+ #define LEGIC_DMA_BUFFER 256
+ // The DMA buffer, used to stream samples from the FPGA
+ //uint8_t *dmaBuf = BigBuf_malloc(LEGIC_DMA_BUFFER);
+ //uint8_t *data = dmaBuf;
+ // Setup and start DMA.
+ // if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, LEGIC_DMA_BUFFER) ){
+ // if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ // return;
+ // }
+
+ //StartCountSspClk();
+ /* Bitbang the receiver */
+ AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ // need a way to determine which tagtype we are simulating
+
+ // hook up emulator memory
+ cardmem = BigBuf_get_EM_addr();
+
+ clear_trace();
+ set_tracing(TRUE);
-//-----------------------------------------------------------------------------
-//-----------------------------------------------------------------------------
+ crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
+
+ StartTicks();
+
+ LED_B_ON();
+ DbpString("Starting Legic emulator, press button to end");
+
+ /*
+ * The mode FPGA_HF_SIMULATOR_MODULATE_212K works like this.
+ * - A 1-bit input to the FPGA becomes 8 pulses on 212kHz (fc/64) (18.88us).
+ * - A 0-bit input to the FPGA becomes an unmodulated time of 18.88us
+ *
+ * In this mode the SOF can be written as 00011101 = 0x1D
+ * The EOF can be written as 10111000 = 0xb8
+ * A logic 1 is 01
+ * A logic 0 is 10
+ volatile uint8_t b;
+ uint8_t i = 0;
+ while( !BUTTON_PRESS() ) {
+ WDT_HIT();
+
+ // not sending anything.
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ }
+
+ // receive
+ if ( AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY ) {
+ b = (uint8_t) AT91C_BASE_SSC->SSC_RHR;
+ bd[i] = b;
+ ++i;
+ // if(OutOfNDecoding(b & 0x0f))
+ // *len = Uart.byteCnt;
+ }
+
+ }
+ */
+
+ while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
+
+ level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+
+ uint32_t time = GET_TICKS;
+
+ if (level != old_level) {
+ if (level == 1) {
+
+ //Dbprintf("start, %u ", time);
+ StartTicks();
+ // did we get a signal
+ 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();
+ }
+
+ /*
+ * Disable the counter, Then wait for the clock to acknowledge the
+ * shutdown in its status register. Reading the SR has the
+ * side-effect of clearing any pending state in there.
+ */
+ //if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA))
+ if(time >= (20 * RWD_TIME_1) )
+ StopTicks();
+
+ old_level = level;
+ WDT_HIT();
+}
+
+ WDT_HIT();
+ DbpString("LEGIC Prime emulator stopped");
+ switch_off_tag_rwd();
+ FpgaDisableSscDma();
+ LEDsoff();
+ cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
+}
//-----------------------------------------------------------------------------
// The software UART that receives commands from the reader, and its state
// variables.
//-----------------------------------------------------------------------------
+/*
static struct {
enum {
STATE_UNSYNCD,
int posCnt;
uint8_t *output;
} Uart;
-
+*/
/* Receive & handle a bit coming from the reader.
*
* This function is called 4 times per bit (every 2 subcarrier cycles).
// return FALSE;
// }
+/*
-
-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();
// }
// tag's response, which we leave in the buffer to be demodulated on the
// PC side.
//=============================================================================
-
+/*
static struct {
enum {
DEMOD_UNSYNCD,
int sumI;
int sumQ;
} Demod;
-
+*/
/*
* Handles reception of a bit from the tag
*
* false if we are still waiting for some more
*
*/
-
- #ifndef SUBCARRIER_DETECT_THRESHOLD
- # define SUBCARRIER_DETECT_THRESHOLD 8
- #endif
- // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
-#ifndef CHECK_FOR_SUBCARRIER
-# define CHECK_FOR_SUBCARRIER() { v = MAX(ai, aq) + MIN(halfci, halfcq); }
-#endif
-
-// The soft decision on the bit uses an estimate of just the
-// quadrant of the reference angle, not the exact angle.
-// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
-#define MAKE_SOFT_DECISION() { \
- if(Demod.sumI > 0) \
- v = ci; \
- else \
- v = -ci; \
- \
- if(Demod.sumQ > 0) \
- v += cq; \
- else \
- v -= cq; \
- \
- }
-
+/*
static RAMFUNC int HandleLegicSamplesDemod(int ci, int cq)
{
int v = 0;
}
return FALSE;
}
-
+*/
+/*
// Clear out the state of the "UART" that receives from the tag.
static void DemodReset() {
Demod.len = 0;
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) {
Demod.output = data;
DemodReset();
}
+*/
/*
* Demodulate the samples we received from the tag, also log to tracebuffer
* quiet: set to 'TRUE' to disable debug output
*/
+
+ /*
#define LEGIC_DMA_BUFFER_SIZE 256
-static void GetSamplesForLegicDemod(int n, bool quiet)
+
+ static void GetSamplesForLegicDemod(int n, bool quiet)
{
int max = 0;
bool gotFrame = FALSE;
LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE);
}
}
+
+*/
+
//-----------------------------------------------------------------------------
// Transmit the command (to the tag) that was placed in ToSend[].
//-----------------------------------------------------------------------------
+/*
static void TransmitForLegic(void)
{
int c;
}
LED_B_OFF();
}
-
+*/
//-----------------------------------------------------------------------------
// Code a layer 2 command (string of octets, including CRC) into ToSend[],
// so that it is ready to transmit to the tag using TransmitForLegic().
//-----------------------------------------------------------------------------
-static void CodeLegicBitsAsReader(const uint8_t *cmd, int bits)
+/*
+static void CodeLegicBitsAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits)
{
int i, j;
uint8_t b;
ToSendReset();
// Send SOF
- for(i = 0; i < 7; i++) {
+ for(i = 0; i < 7; i++)
ToSendStuffBit(1);
- }
- for(i = 0; i < bits; i++) {
+
+ for(i = 0; i < cmdlen; i++) {
// Start bit
ToSendStuffBit(0);
// Data bits
b = cmd[i];
- for(j = 0; j < 8; j++) {
+ for(j = 0; j < bits; j++) {
if(b & 1) {
ToSendStuffBit(1);
} else {
// Convert from last character reference to length
++ToSendMax;
}
-
+*/
/**
Convenience function to encode, transmit and trace Legic comms
**/
-static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, int bits)
+/*
+ static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits)
{
- CodeLegicBitsAsReader(cmd, bits);
+ CodeLegicBitsAsReader(cmd, cmdlen, bits);
TransmitForLegic();
if (tracing) {
uint8_t parity[1] = {0x00};
- LogTrace(cmd, bits, 0, 0, parity, TRUE);
+ LogTrace(cmd, cmdlen, 0, 0, parity, TRUE);
}
}
-int ice_legic_select_card()
-{
- //int cmd_size=0, card_size=0;
- uint8_t wakeup[] = { 0x7F};
- uint8_t getid[] = {0x19};
-
- legic_prng_init(SESSION_IV);
-
- // first, wake up the tag, 7bits
- CodeAndTransmitLegicAsReader(wakeup, 7);
-
- GetSamplesForLegicDemod(1000, TRUE);
-
- // frame_clean(¤t_frame);
- //frame_receive_rwd(¤t_frame, 6, 1);
-
- legic_prng_forward(1); /* we wait anyways */
-
- //while(timer->TC_CV < 387) ; /* ~ 258us */
- //frame_send_rwd(0x19, 6);
- CodeAndTransmitLegicAsReader(getid, sizeof(getid));
- GetSamplesForLegicDemod(1000, TRUE);
-
- //if (Demod.len < 14) return 2;
- Dbprintf("CARD TYPE: %02x LEN: %d", Demod.output[0], Demod.len);
-
- switch(Demod.output[0]) {
- case 0x1d:
- DbpString("MIM 256 card found");
- // cmd_size = 9;
- // card_size = 256;
- break;
- case 0x3d:
- DbpString("MIM 1024 card found");
- // cmd_size = 11;
- // card_size = 1024;
- break;
- default:
- return -1;
- }
-
- // if(bytes == -1)
- // bytes = card_size;
-
- // if(bytes + offset >= card_size)
- // bytes = card_size - offset;
-
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- set_tracing(FALSE);
- return 1;
-}
-
+*/
// Set up LEGIC communication
+/*
void ice_legic_setup() {
// standard things.
// 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();
// initalize prng
legic_prng_init(0);
-}
\ No newline at end of file
+}
+*/
\ No newline at end of file
projects / proxmark3-svn / blobdiff