//-----------------------------------------------------------------------------
// (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 "legicrf.h"
static struct legic_frame {
- int bits;
+ uint8_t bits;
uint32_t data;
} current_frame;
*/
// 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 */
-
-// testing calculating in ticks instead of (us) microseconds.
+// testing calculating in (us) microseconds.
#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 150 // 100us == 100 * 1.5 == 150ticks
+#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 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);
+# 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;
-
+#ifndef LINE_IN
+# define LINE_IN \
+ do { \
+ AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; \
+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; \
+ } while (0);
+#endif
// Pause pulse, off in 20us / 30ticks,
// ONE / ZERO bit pulse,
// one == 80us / 120ticks
// zero == 40us / 60ticks
#ifndef COIL_PULSE
-# define COIL_PULSE(x) { \
+# define COIL_PULSE(x) \
+ do { \
SHORT_COIL; \
- Wait(RWD_TIME_PAUSE); \
+ WaitTicks( (RWD_TIME_PAUSE) ); \
OPEN_COIL; \
- Wait((x)); \
- }
-#endif
-#ifndef GET_TICKS
-# define GET_TICKS AT91C_BASE_TC0->TC_CV
+ 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.
#define LEGIC_CARD_MEMSIZE 1024
static uint8_t* cardmem;
-static void Wait(uint32_t time){
- if ( time == 0 ) return;
- time += GET_TICKS;
- while (GET_TICKS < time);
-}
-// 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);
-}
-
-static void frame_append_bit(struct legic_frame * const f, int bit) {
+static void frame_append_bit(struct legic_frame * const f, uint8_t bit) {
// Overflow, won't happen
if (f->bits >= 31) return;
// 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 ;
+ uint32_t i = (time - sendFrameStop) / 100 ;
// substract cycles of finished frames
int k = i - legic_prng_count()+1;
*/
/* Generate Keystream */
-static uint32_t get_key_stream(int skip, int count)
-{
- uint32_t key = 0;
+uint32_t get_key_stream(int skip, int count) {
+
int i;
// Use int to enlarge timer tc to 32bit
legic_prng_bc += prng_timer->TC_CV;
// reset the prng timer.
- Reset(prng_timer);
/* If skip == -1, forward prng time based */
if(skip == -1) {
i = (count == 6) ? -1 : legic_read_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++) {
- 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, uint8_t bits, uint8_t crypt) {
+void frame_send_tag(uint16_t response, uint8_t bits) {
+
+ uint16_t mask = 1;
+
/* Bitbang the response */
- LOW(GPIO_SSC_DOUT);
+ SHORT_COIL;
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_FRAME_WAIT -> shift by 2 */
- response ^= legic_prng_get_bits(bits);
- }
+ /* TAG_FRAME_WAIT -> shift by 2 */
+ legic_prng_forward(2);
+ response ^= legic_prng_get_bits(bits);
/* Wait for the frame start */
- Wait( TAG_FRAME_WAIT );
-
- uint8_t bit = 0;
- for(int i = 0; i < bits; i++) {
-
- bit = response & 1;
- response >>= 1;
+ WaitTicks( TAG_FRAME_WAIT );
- if (bit)
- HIGH(GPIO_SSC_DOUT);
+ for (; mask < BITMASK(bits); mask <<= 1) {
+ if (response & mask)
+ OPEN_COIL
else
- LOW(GPIO_SSC_DOUT);
-
- Wait(100);
+ SHORT_COIL
+ WaitTicks(TAG_BIT_PERIOD);
}
- LOW(GPIO_SSC_DOUT);
+ SHORT_COIL;
}
/* Send a frame in reader mode, the FPGA must have been set up by
* LegicRfReader
*/
-static void frame_sendAsReader(uint32_t data, uint8_t bits){
+void frame_sendAsReader(uint32_t data, uint8_t bits){
uint32_t starttime = GET_TICKS, send = 0;
uint16_t mask = 1;
- uint8_t prng1 = legic_prng_count() ;
// 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 {
- COIL_PULSE(RWD_TIME_0);
- }
+ if (send & mask)
+ COIL_PULSE(RWD_TIME_1)
+ else
+ COIL_PULSE(RWD_TIME_0)
}
// Final pause to mark the end of the frame
COIL_PULSE(0);
- stop_send_frame_us = GET_TICKS;
- uint8_t cmdbytes[] = {
- BYTEx(data, 0),
- BYTEx(data, 1),
- bits,
- prng1,
- legic_prng_count()
- };
- LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, TRUE);
+ // log
+ uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1)};
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
}
/* Receive a frame from the card in reader emulation mode, the FPGA and
*/
static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) {
+ 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);
- uint8_t i = 0, edges = 0;
- uint16_t lsfr = 0;
- uint32_t the_bit = 1, next_bit_at = 0, data;
- int old_level = 0, level = 0;
-
- if(bits > 32) bits = 32;
-
- AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
- AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+ /* Bitbang the receiver */
+ LINE_IN;
- // calibrate the prng.
+ // calibrate the prng.
legic_prng_forward(2);
-
- // precompute the cipher
- uint8_t prng_before = legic_prng_count() ;
-
- lsfr = legic_prng_get_bits(bits);
-
- data = lsfr;
+ data = legic_prng_get_bits(bits);
//FIXED time between sending frame and now listening frame. 330us
- Wait( TAG_FRAME_WAIT );
-
uint32_t starttime = GET_TICKS;
-
- next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
-
- for( i = 0; i < bits; i++) {
+ // its about 9+9 ticks delay from end-send to here.
+ WaitTicks( 477 );
+
+ next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
+
+ while ( i-- ){
edges = 0;
while ( GET_TICKS < next_bit_at) {
++edges;
old_level = level;
- }
+ }
+
next_bit_at += TAG_BIT_PERIOD;
- // We expect 42 edges == ONE
- if(edges > 20 && edges < 60) {
+ // We expect 42 edges (ONE)
+ if ( edges > 20 )
data ^= the_bit;
- }
- the_bit <<= 1;
+
+ the_bit <<= 1;
}
// output
f->data = data;
f->bits = bits;
-
- // log
- stop_send_frame_us = GET_TICKS;
- uint8_t cmdbytes[] = {
- BYTEx(data,0),
- BYTEx(data,1),
- bits,
- BYTEx(lsfr,0),
- BYTEx(lsfr,1),
- prng_before,
- legic_prng_count()
- };
- LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, FALSE);
+ // log
+ uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)};
+ LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
}
// Setup pm3 as a Legic Reader
-static uint32_t perform_setup_phase_rwd(uint8_t iv) {
-
+static uint32_t setup_phase_reader(uint8_t iv) {
+
// Switch on carrier and let the tag charge for 1ms
HIGH(GPIO_SSC_DOUT);
- SpinDelay(40);
+ WaitUS(5000);
- ResetUSClock();
+ ResetTicks();
// no keystream yet
legic_prng_init(0);
frame_receiveAsReader(¤t_frame, 6);
- // fixed delay before sending ack.
- Wait(TAG_FRAME_WAIT);
- legic_prng_forward(4);
+ // 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;
+ 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) {
+static void LegicCommonInit(void) {
+
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
/* Bitbang the transmitter */
LOW(GPIO_SSC_DOUT);
AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
// reserve a cardmem, meaning we can use the tracelog function in bigbuff easier.
- cardmem = BigBuf_malloc(LEGIC_CARD_MEMSIZE);
+ cardmem = BigBuf_get_EM_addr();
memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
clear_trace();
set_tracing(TRUE);
crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
- StartCountUS();
+ StartTicks();
}
// Switch off carrier, make sure tag is reset
static void switch_off_tag_rwd(void) {
LOW(GPIO_SSC_DOUT);
- SpinDelay(10);
+ WaitUS(20);
WDT_HIT();
}
// calculate crc4 for a legic READ command
-// 5,8,10 address size.
-static uint32_t legic4Crc(uint8_t legicCmd, uint16_t byte_index, uint8_t value, uint8_t cmd_sz) {
+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) | legicCmd;
+ 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) {
-
- uint8_t byte = 0, crc = 0;
- uint32_t calcCrc = 0;
- uint32_t cmd = (byte_index << 1) | LEGIC_READ;
+int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
- Wait(TAG_FRAME_WAIT);
+ 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);
+ // CRC check.
byte = BYTEx(current_frame.data, 0);
- calcCrc = legic4Crc(LEGIC_READ, byte_index, byte, cmd_sz);
crc = BYTEx(current_frame.data, 1);
+ calcCrc = legic4Crc(LEGIC_READ, index, byte, cmd_sz);
if( calcCrc != crc ) {
Dbprintf("!!! crc mismatch: expected %x but got %x !!!", calcCrc, crc);
return -1;
}
- legic_prng_forward(4);
+
+ legic_prng_forward(3);
return byte;
}
* - 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(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
-
- //do not write UID, CRC at offset 0-4.
- if (addr <= 4) return 0;
+int legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
// crc
crc_clear(&legic_crc);
crc_update(&legic_crc, 0, 1); /* CMD_WRITE */
- crc_update(&legic_crc, addr, addr_sz);
+ crc_update(&legic_crc, index, addr_sz);
crc_update(&legic_crc, byte, 8);
uint32_t crc = crc_finish(&legic_crc);
-
- uint32_t crc2 = legic4Crc(LEGIC_WRITE, addr, byte, addr_sz+1);
- if ( crc != crc2 )
+ uint32_t crc2 = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
+ if ( crc != crc2 ) {
Dbprintf("crc is missmatch");
-
+ return 1;
+ }
// send write command
uint32_t cmd = ((crc <<(addr_sz+1+8)) //CRC
|(byte <<(addr_sz+1)) //Data
- |(addr <<1) //Address
- | LEGIC_WRITE); //CMD = Write
+ |(index <<1) //index
+ | LEGIC_WRITE); //CMD = Write
uint32_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd
- legic_prng_forward(2); /* we wait anyways */
+ legic_prng_forward(2);
- Wait(TAG_FRAME_WAIT);
+ WaitTicks(330);
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;
- // wait for ack
+ /* Bitbang the receiver */
+ LINE_IN;
+
int t, old_level = 0, edges = 0;
int next_bit_at = 0;
- Wait(TAG_FRAME_WAIT);
+ // ACK 3.6ms = 3600us * 1.5 = 5400ticks.
+ WaitTicks(5360);
for( t = 0; t < 80; ++t) {
edges = 0;
next_bit_at += TAG_BIT_PERIOD;
while(timer->TC_CV < next_bit_at) {
- int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+ 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 */
+ /* expected are 42 edges (ONE) */
+ if(edges > 20 ) {
int t = timer->TC_CV;
int c = t / TAG_BIT_PERIOD;
- ResetClock();
+ ResetTimer(timer);
legic_prng_forward(c);
return 0;
}
}
- ResetClock();
return -1;
}
-int LegicRfReader(int offset, int bytes, int iv) {
+int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
- uint16_t byte_index = 0;
- uint8_t cmd_sz = 0;
- int card_sz = 0;
-
- if ( MF_DBGLEVEL >= 2)
- Dbprintf("setting up legic card, IV = 0x%03.3x", iv);
+ uint16_t i = 0;
+ uint8_t isOK = 1;
+ legic_card_select_t card;
LegicCommonInit();
-
- uint32_t tag_type = perform_setup_phase_rwd(iv);
-
- //we lose to mutch time with dprintf
- switch_off_tag_rwd();
- switch(tag_type) {
- case 0x0d:
- if ( MF_DBGLEVEL >= 2) DbpString("MIM22 card found, reading card");
- cmd_sz = 6;
- card_sz = 22;
- break;
- case 0x1d:
- if ( MF_DBGLEVEL >= 2) DbpString("MIM256 card found, reading card");
- cmd_sz = 9;
- card_sz = 256;
- break;
- case 0x3d:
- if ( MF_DBGLEVEL >= 2) DbpString("MIM1024 card found, reading card");
- cmd_sz = 11;
- card_sz = 1024;
- break;
- default:
- if ( MF_DBGLEVEL >= 1) Dbprintf("Unknown card format: %x", tag_type);
- return 1;
+ 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;
+ switch_off_tag_rwd();
- // Start setup and read bytes.
- perform_setup_phase_rwd(iv);
+ if (len + offset >= card.cardsize)
+ len = card.cardsize - offset;
+ setup_phase_reader(iv);
+
LED_B_ON();
- while (byte_index < bytes) {
- int r = legic_read_byte(byte_index + offset, cmd_sz);
+ while (i < len) {
+ int r = legic_read_byte(offset + i, card.cmdsize);
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;
+ isOK = 0;
+ goto OUT;
}
- cardmem[++byte_index] = r;
- //byte_index++;
+ cardmem[i++] = r;
WDT_HIT();
}
+OUT:
+ WDT_HIT();
switch_off_tag_rwd();
LEDsoff();
- uint8_t len = (bytes & 0x3FF);
- cmd_send(CMD_ACK,1,len,0,0,0);
+ cmd_send(CMD_ACK, isOK, len, 0, cardmem, len);
return 0;
}
-/*int _LegicRfWriter(int offset, int bytes, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) {
- int byte_index=0;
-
- LED_B_ON();
- perform_setup_phase_rwd(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;
- }
-
- WDT_HIT();
- byte_index++;
- if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
- }
- LED_B_OFF();
- LED_C_OFF();
- DbpString("write successful");
- return 0;
-}*/
-
-void LegicRfWriter(int offset, int bytes, int iv) {
+void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
- int byte_index = 0, addr_sz = 0;
-
- LegicCommonInit();
+ uint8_t isOK = 1;
- if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
+ // UID not is writeable.
+ if ( offset <= 4 ) {
+ isOK = 0;
+ goto OUT;
+ }
- uint32_t tag_type = perform_setup_phase_rwd(iv);
+ legic_card_select_t card;
- switch_off_tag_rwd();
+ LegicCommonInit();
- switch(tag_type) {
- case 0x0d:
- if(offset+bytes > 22) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset + bytes);
- return;
- }
- addr_sz = 5;
- 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) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset + bytes);
- return;
- }
- addr_sz = 8;
- 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) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset + bytes);
- return;
- }
- addr_sz = 10;
- 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 ( legic_select_card_iv(&card, iv) ) {
+ isOK = 0;
+ goto OUT;
}
+
+ if (len + offset >= card.cardsize)
+ len = card.cardsize - offset;
- LED_B_ON();
- perform_setup_phase_rwd(iv);
- int r = 0;
- 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(cardmem[(0x06-byte_index)], (0x06-byte_index), addr_sz);
+ setup_phase_reader(iv);
- // write second byte on success...
- if(r == 0) {
- byte_index++;
- r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), addr_sz);
- }
- }
- else {
- r = legic_write_byte(cardmem[byte_index+offset], byte_index+offset, addr_sz);
- }
+ LED_B_ON();
+ int r = 0;
+ // how about we write backwards instead. no need for this extra DCF check.
+ // index = len - cardsize
+ // stops uid 01234,
+ /*
+ len = 20
+ offset = 5
+
+ index = 20+5 = 25
+ if ( index > cardsize ) return -1;
+
+ loop
+ write( data[index], index , card.addrsize);
+ --index;
+ end loop
+ */
+ uint16_t index = len;
+ while(index > 4) {
+
+ r = legic_write_byte( index, data[ index ], card.addrsize);
- if ((r != 0) || BUTTON_PRESS()) {
- Dbprintf("operation aborted @ 0x%03.3x", byte_index);
- switch_off_tag_rwd();
- LEDsoff();
- return;
+ if ( r ) {
+ Dbprintf("operation aborted @ 0x%03.3x", index);
+ isOK = 0;
+ goto OUT;
}
-
- WDT_HIT();
- byte_index++;
+ --index;
+ WDT_HIT();
}
- LEDsoff();
- if ( MF_DBGLEVEL >= 1) DbpString("write successful");
+
+OUT:
+ cmd_send(CMD_ACK, isOK, 0,0,0,0);
+ switch_off_tag_rwd();
+ LEDsoff();
}
-void LegicRfRawWriter(int address, int byte, int iv) {
+int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){
- int byte_index = 0, addr_sz = 0;
-
- LegicCommonInit();
-
- if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
+ if ( p_card == NULL ) return 1;
- uint32_t tag_type = perform_setup_phase_rwd(iv);
-
- switch_off_tag_rwd();
+ p_card->tagtype = setup_phase_reader(iv);
- switch(tag_type) {
+ switch(p_card->tagtype) {
case 0x0d:
- if(address > 22) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM22", address);
- return;
- }
- addr_sz = 5;
- if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
+ p_card->cmdsize = 6;
+ p_card->addrsize = 5;
+ p_card->cardsize = 22;
break;
case 0x1d:
- if(address > 0x100) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM256", address);
- return;
- }
- addr_sz = 8;
- if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
+ p_card->cmdsize = 9;
+ p_card->addrsize = 8;
+ p_card->cardsize = 256;
break;
case 0x3d:
- if(address > 0x400) {
- Dbprintf("Error: can not write to 0x%03.3x on MIM1024", address);
- return;
- }
- addr_sz = 10;
- if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte);
+ 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);
+}
+
+void LegicRfInfo(void){
+
+ int r;
- Dbprintf("integer value: %d address: %d addr_sz: %d", byte, address, addr_sz);
- LED_B_ON();
+ uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
+ legic_card_select_t *card = (legic_card_select_t*) buf;
- perform_setup_phase_rwd(iv);
-
- int r = legic_write_byte(byte, address, addr_sz);
-
- if((r != 0) || BUTTON_PRESS()) {
- Dbprintf("operation aborted @ 0x%03.3x (%1d)", byte_index, r);
- switch_off_tag_rwd();
- LEDsoff();
- return;
+ LegicCommonInit();
+
+ if ( legic_select_card(card) ) {
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ goto OUT;
+ }
+
+ // 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;
+ }
+ card->uid[i] = r & 0xFF;
+ }
+
+ // 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;
}
+
+ // OK
+ cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t));
- LEDsoff();
- if ( MF_DBGLEVEL >= 1) DbpString("write successful");
+OUT:
+ switch_off_tag_rwd();
+ LEDsoff();
}
/* 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();
+ // log
+ //uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)};
+ //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
+
+ cardmem = BigBuf_get_EM_addr();
+
+ /* First Part of Handshake (IV) */
+ if(f->bits == 7) {
- /* First Part of Handshake (IV) */
- if(f->bits == 7) {
+ LED_C_ON();
- LED_C_ON();
-
// Reset prng timer
- Reset(prng_timer);
+ ResetTimer(prng_timer);
+
+ // IV from reader.
+ legic_prng_init(f->data);
- 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;
-
-
- ResetClock();
- Wait(280);
- return;
- }
+ // We should have three tagtypes with three different answers.
+ frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
+
+ legic_state = STATE_IV;
+ legic_read_count = 0;
+ legic_prng_bc = 0;
+ legic_prng_iv = f->data;
+
+
+ ResetTimer(timer);
+ WaitUS(280);
+ return;
+ }
/* 0x19==??? */
if(legic_state == STATE_IV) {
- int local_key = get_key_stream(3, 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;
- ResetClock();
- Wait(200);
+ ResetTimer(timer);
+ WaitUS(200);
return;
} else {
/* Read */
if(f->bits == 11) {
if(legic_state == STATE_CON) {
- int key = get_key_stream(2, 11); //legic_phase_drift, 11);
- int addr = f->data ^ key; addr = addr >> 1;
- int data = BigBuf[addr];
+ 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];
int hash = legic4Crc(LEGIC_READ, 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_read_count++;
legic_prng_forward(legic_reqresp_drift);
- frame_send_tag(hash | data, 12, 1);
-
- ResetClock();
+ frame_send_tag(hash | data, 12);
+ ResetTimer(timer);
legic_prng_forward(2);
- Wait(180);
+ 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;
-
+ 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 within 3.5ms too
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);
* on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,
* seems to be 300us-ish.
*/
+
+ int old_level = 0, active = 0;
+ legic_state = STATE_DISCON;
legic_phase_drift = phase;
legic_frame_drift = frame;
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;
+ LINE_IN;
+
+ // need a way to determine which tagtype we are simulating
+
+ // hook up emulator memory
+ cardmem = BigBuf_get_EM_addr();
+
+ clear_trace();
+ set_tracing(TRUE);
- //setup_timer();
crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
- int old_level = 0;
- int active = 0;
- legic_state = STATE_DISCON;
+ StartTicks();
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;
+ volatile uint32_t level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
- if(level != old_level) {
- if(level == 1) {
- timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+ uint32_t time = GET_TICKS;
+
+ if (level != old_level) {
+
+ if (level) {
+
+ ResetTicks();
if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
/* 1 bit */
LED_A_OFF();
}
- if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
- timer->TC_CCR = AT91C_TC_CLKDIS;
- }
+ /*
+ * 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))
+ StopTicks();
old_level = level;
WDT_HIT();
}
- if ( MF_DBGLEVEL >= 1) DbpString("Stopped");
+
+ WDT_HIT();
+ switch_off_tag_rwd();
LEDsoff();
+ cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
}
-//-----------------------------------------------------------------------------
-//-----------------------------------------------------------------------------
-
-
//-----------------------------------------------------------------------------
// Code up a string of octets at layer 2 (including CRC, we don't generate
// that here) so that they can be transmitted to the reader. Doesn't transmit
// 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 = 3;
Uart.posCnt = 0;
memset(Uart.output, 0x00, 3);
}
-
+*/
// 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.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, uint8_t cmdlen, int bits)
{
int i, j;
// Convert from last character reference to length
++ToSendMax;
}
-
+*/
/**
Convenience function to encode, transmit and trace Legic comms
**/
-static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits)
+/*
+ static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits)
{
CodeLegicBitsAsReader(cmd, cmdlen, bits);
TransmitForLegic();
}
}
-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, sizeof(wakeup), 7);
-
- GetSamplesForLegicDemod(1000, TRUE);
-
- //frame_receiveAsReader(¤t_frame, 6, 1);
-
- legic_prng_forward(1); /* we wait anyways */
-
- //while(timer->TC_CV < 387) ; /* ~ 258us */
- //frame_sendAsReader(0x19, 6);
- CodeAndTransmitLegicAsReader(getid, sizeof(getid), 8);
- 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.
// initalize prng
legic_prng_init(0);
-}
\ No newline at end of file
+}
+*/
\ No newline at end of file
projects / proxmark3-svn / blobdiff