X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f7b4257301e2ff4b490ae84d0b8ecbe3c7dfe241..0e8cabed8d180d2e03ba0cc04c853dad501cff7a:/armsrc/legicrf.c?ds=sidebyside diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index 1596c50c..19f12a95 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -1,5 +1,6 @@ //----------------------------------------------------------------------------- // (c) 2009 Henryk Plötz +// 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 @@ -7,11 +8,10 @@ //----------------------------------------------------------------------------- // LEGIC RF simulation code //----------------------------------------------------------------------------- - #include "legicrf.h" static struct legic_frame { - int bits; + uint8_t bits; uint32_t data; } current_frame; @@ -30,25 +30,24 @@ static int legic_phase_drift; 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. - */ + // 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; @@ -56,54 +55,99 @@ static void setup_timer(void) { 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 /* 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 (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 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))) -// ~ 258us + 100us*delay -#define WAIT_387 WAIT(387) -#define WAIT(delay) while(timer->TC_CV < (delay) ); +#ifndef SHORT_COIL +# define SHORT_COIL LOW(GPIO_SSC_DOUT); +#endif +#ifndef OPEN_COIL +# define OPEN_COIL HIGH(GPIO_SSC_DOUT); +#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; -/* -The new tracelog.. - // Traceformat: - // 32 bits timestamp (little endian) - // 16 bits duration (little endian) - // 16 bits data length (little endian, Highest Bit used as readerToTag flag) - // y Bytes data - // x Bytes parity (one byte per 8 bytes data) +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; +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. - prng_timer->TC_CCR = AT91C_TC_SWTRG; - while(prng_timer->TC_CV > 1) ; /* If skip == -1, forward prng time based */ if(skip == -1) { @@ -117,129 +161,71 @@ static uint32_t get_key_stream(int skip, int count) 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; + // log + //uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1), legic_prng_count()}; + //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE); /* Generate KeyStream */ - for(i=0; iPIO_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 key = 0; - for(int i = 0; i < bits; i++) { - key |= legic_prng_get_bit() << i; - legic_prng_forward(1); - } - response = response ^ key; - } +void frame_send_tag(uint16_t response, uint8_t bits) { - /* Wait for the frame start */ - //while(timer->TC_CV < (TAG_TIME_WAIT - 30)) ; - WAIT( TAG_TIME_WAIT - 30) - - uint8_t bit = 0; - for(int i = 0; i < bits; i++) { - int nextbit = timer->TC_CV + TAG_TIME_BIT; - bit = response & 1; - 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) ; - WAIT(nextbit) - } - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; -} + 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; -// Starts Clock and waits until its reset -static void ResetClock(void){ - timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; + /* TAG_FRAME_WAIT -> shift by 2 */ + legic_prng_forward(2); + response ^= legic_prng_get_bits(bits); + + /* Wait for the frame start */ + WaitTicks( TAG_FRAME_WAIT ); + + for (; mask < BITMASK(bits); mask <<= 1) { + if (response & mask) + OPEN_COIL + else + SHORT_COIL + WaitTicks(TAG_BIT_PERIOD); + } + 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, uint8_t bits){ +void frame_sendAsReader(uint32_t data, uint8_t bits){ - uint8_t bit = 0; - uint32_t starttime = 0, pause_end = 0, bit_end = 0, temp = data; - ResetClock(); + uint32_t starttime = GET_TICKS, send = 0; + uint16_t mask = 1; - for(int i = 0; i < bits; i++) { - - starttime = timer->TC_CV; - pause_end = starttime + RWD_TIME_PAUSE; - bit = temp & 1; - temp >>= 1; - - if(bit ^ legic_prng_get_bit()) - bit_end = starttime + RWD_TIME_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; - - WAIT( pause_end ) - - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - - // bit duration is longest. use this time to forward the lfsr - legic_prng_forward(1); - - WAIT( bit_end ) + COIL_PULSE(RWD_TIME_0) } - // One final pause to mark the end of the frame - pause_end = timer->TC_CV + RWD_TIME_PAUSE; - - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - - WAIT(pause_end) + // Final pause to mark the end of the frame + COIL_PULSE(0); - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - // log - uint8_t cmdbytes[2] = { (data & 0xFF), 0 }; - if ( bits > 8 ) { - cmdbytes[1] = (data >> 8 ) & 0xFF; - LogTrace(cmdbytes, 2, 0, timer->TC_CV, NULL, TRUE); - } else { - LogTrace(cmdbytes, 1, 0, timer->TC_CV, NULL, TRUE); - } - /* Reset the timer, to measure time until the start of the tag frame */ - ResetClock(); + 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 - * 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 @@ -252,191 +238,167 @@ static void frame_send_rwd(uint32_t data, uint8_t bits){ * 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 starttime = timer->TC_CV; +static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { + + if ( bits > 32 ) return; - uint32_t the_bit = 1; - uint32_t data = 0;/* Use a bitmask to save on shifts */ - int i, old_level = 0, edges = 0; - int next_bit_at = TAG_TIME_WAIT; - int level = 0; + 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; - if(bits > 32) bits = 32; - + frame_clean(f); + 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 */ + + // 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; iTC_CV < next_bit_at) { + while ( GET_TICKS < next_bit_at) { + level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); - if(level != old_level) - edges++; + + if (level != old_level) + ++edges; + old_level = level; - } - next_bit_at += TAG_TIME_BIT; + } + + next_bit_at += TAG_BIT_PERIOD; - // We expect 42 edges - 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 - uint8_t cmdbytes[] = { (data & 0xFF), (data >> 8) & 0xFF }; - LogTrace(cmdbytes, 2, starttime, timer->TC_CV, NULL, FALSE); - // Reset the timer, to synchronize the next frame - ResetClock(); -} - -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) { - 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); } // 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 - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - SpinDelay(20); // was 1ms before. - + HIGH(GPIO_SSC_DOUT); + WaitUS(5000); + + ResetTicks(); + // no keystream yet legic_prng_init(0); - - frame_send_rwd(iv, 7); + // send IV handshake + frame_sendAsReader(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); + frame_receiveAsReader(¤t_frame, 6); - // we wait anyways - legic_prng_forward(3); + // 292us (438t) - fixed delay before sending ack. + // minus log and stuff 100tick? + WaitTicks(338); + legic_prng_forward(3); - WAIT(387) - // Send obsfuscated acknowledgment frame. - // 0x19 = MIM22 - // 0x39 = MIM256, MIM1024 - if ( current_frame.data == 0x0D ){ - frame_send_rwd(0x19, 6); - }else{ - frame_send_rwd(0x39, 6); + // 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) { - + 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; + LOW(GPIO_SSC_DOUT); AT91C_BASE_PIOA->PIO_OER = 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); - - setup_timer(); - crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); + + StartTicks(); } -/* Switch off carrier, make sure tag is reset */ +// 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); + LOW(GPIO_SSC_DOUT); + WaitUS(20); WDT_HIT(); } // 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); - crc_update(&legic_crc, LEGIC_READ, 1); - crc_update(&legic_crc, byte_index, cmd_sz-1); - crc_update(&legic_crc, value, 8); +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); } -#define LEGIC_READ 0x01 -#define LEGIC_WRITE 0x00 - -int legic_read_byte(int byte_index, int cmd_sz) { - - int calcCrc = 0, crc = 0; - uint8_t byte = 0; - uint32_t cmd = (byte_index << 1) | LEGIC_READ; - - WAIT_387 - - // send read command - frame_send_rwd(cmd, cmd_sz); +int legic_read_byte( uint16_t index, uint8_t cmd_sz) { - frame_clean(¤t_frame); - - // receive - 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; - calcCrc = LegicCRC(byte_index, byte, cmd_sz); - crc = (current_frame.data >> 8); + // CRC check. + byte = BYTEx(current_frame.data, 0); + 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; } - // we wait anyways - legic_prng_forward(4); + legic_prng_forward(3); return byte; } @@ -445,314 +407,273 @@ int legic_read_byte(int byte_index, int cmd_sz) { * - 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 at offset 0-4. - if(addr <= 0x04) 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, 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 - |(0x00 <<0)); //CMD = W + |(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); - while(timer->TC_CV < 387) ; /* ~ 258us */ + WaitTicks(330); - frame_send_rwd(cmd, cmd_sz); - -// wllm-rbnt doesnt have these -// AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; -// AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; + frame_sendAsReader(cmd, cmd_sz); // wait for ack + AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; + int t, old_level = 0, edges = 0; int next_bit_at = 0; - while(timer->TC_CV < 387) ; /* ~ 258us */ + // ACK 3.6ms = 3600us * 1.5 = 5400ticks. + WaitTicks(5360); - 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) { + 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_TIME_BIT; + 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 i = 0; + uint8_t isOK = 1; + legic_card_select_t card; - // ice_legic_setup(); - // ice_legic_select_card(); - // return 0; - int byte_index = 0, cmd_sz = 0, card_sz = 0; - LegicCommonInit(); - - if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); - - 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; - - perform_setup_phase_rwd(iv); + switch_off_tag_rwd(); - legic_prng_forward(2); + 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); - if(r == -1 || BUTTON_PRESS()) { - switch_off_tag_rwd(); - LEDsoff(); + while (i < len) { + int r = legic_read_byte(offset + i, card.cmdsize); + + if (r == -1 || BUTTON_PRESS()) { if ( MF_DBGLEVEL >= 2) DbpString("operation aborted"); - return -1; + isOK = 0; + goto OUT; } - cardmem[byte_index] = r; + cardmem[i++] = r; WDT_HIT(); - byte_index++; } +OUT: + WDT_HIT(); switch_off_tag_rwd(); LEDsoff(); - - if ( MF_DBGLEVEL >= 1) Dbprintf("Card read, use 'hf legic decode' or"); - if ( MF_DBGLEVEL >= 1) Dbprintf("'data hexsamples %d' to view results", (bytes+7) & ~7); + 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(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(); + uint8_t isOK = 1; + + // UID not is writeable. + if ( offset <= 4 ) { + isOK = 0; + goto OUT; } - LED_B_OFF(); - LED_C_OFF(); - DbpString("write successful"); - return 0; -}*/ - -void LegicRfWriter(int offset, int bytes, int iv) { - - int byte_index = 0, addr_sz = 0; - iv = (iv <=0 ) ? SESSION_IV : iv; - + legic_card_select_t card; + LegicCommonInit(); - if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); + if ( legic_select_card_iv(&card, iv) ) { + isOK = 0; + goto OUT; + } - uint32_t tag_type = perform_setup_phase_rwd(iv); + if (len + offset >= card.cardsize) + len = card.cardsize - offset; + + setup_phase_reader(iv); + + 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 - switch_off_tag_rwd(); + index = 20+5 = 25 + if ( index > cardsize ) return -1; - 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; - } - - LED_B_ON(); - perform_setup_phase_rwd(iv); - while(byte_index < bytes) { - int r; - - //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); - - // 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); - } + loop + write( cardmem[index], index , card.addrsize); + --index; + end loop + */ + uint16_t index = len; + while(index > 4) { + + r = legic_write_byte( index, cardmem[ 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; - - iv = (iv <= 0) ? SESSION_IV : iv; - - LegicCommonInit(); + if ( p_card == NULL ) return 1; - if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); + p_card->tagtype = setup_phase_reader(iv); - uint32_t tag_type = perform_setup_phase_rwd(iv); - - switch_off_tag_rwd(); - - 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); - //legic_prng_forward(2); - - 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 @@ -762,28 +683,26 @@ 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) { + /* First Part of Handshake (IV) */ + if(f->bits == 7) { + + LED_C_ON(); + + // Reset prng timer + ResetTimer(prng_timer); + + legic_prng_init(f->data); + 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; - LED_C_ON(); - - prng_timer->TC_CCR = AT91C_TC_SWTRG; - while(prng_timer->TC_CV > 1) ; - - 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 */ - ResetClock(); - - //while(timer->TC_CV < 280); - WAIT(280) - return; - } + + ResetTimer(timer); + WaitUS(280); + return; + } /* 0x19==??? */ if(legic_state == STATE_IV) { @@ -792,14 +711,11 @@ static void frame_handle_tag(struct legic_frame const * const f) if((f->bits == 6) && (f->data == xored)) { legic_state = STATE_CON; - /* TIMEOUT */ - ResetClock(); - - //while(timer->TC_CV < 200); - WAIT(200) - + ResetTimer(timer); + WaitUS(200); return; - } else { + + } else { legic_state = STATE_DISCON; LED_C_OFF(); Dbprintf("iv: %02x frame: %02x key: %02x xored: %02x", legic_prng_iv, f->data, local_key, xored); @@ -813,22 +729,18 @@ static void frame_handle_tag(struct legic_frame const * const f) int key = get_key_stream(2, 11); //legic_phase_drift, 11); int addr = f->data ^ key; addr = addr >> 1; int data = BigBuf[addr]; - int hash = LegicCRC(addr, data, 11) << 8; + 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_prng_forward(legic_reqresp_drift); - frame_send_tag(hash | data, 12, 1); + frame_send_tag(hash | data, 12); - /* TIMEOUT */ - ResetClock(); - + ResetTimer(timer); legic_prng_forward(2); - //while(timer->TC_CV < 180); - WAIT(180) - + WaitUS(180); return; } } @@ -924,7 +836,7 @@ void LegicRfSimulate(int phase, int frame, int reqresp) AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; - setup_timer(); + //setup_timer(); crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); int old_level = 0; @@ -979,10 +891,6 @@ void LegicRfSimulate(int phase, int frame, int reqresp) LEDsoff(); } -//----------------------------------------------------------------------------- -//----------------------------------------------------------------------------- - - //----------------------------------------------------------------------------- // 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 @@ -1074,6 +982,7 @@ void LegicRfSimulate(int phase, int frame, int reqresp) // The software UART that receives commands from the reader, and its state // variables. //----------------------------------------------------------------------------- +/* static struct { enum { STATE_UNSYNCD, @@ -1088,7 +997,7 @@ static struct { 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). @@ -1213,7 +1122,7 @@ static struct { // return FALSE; // } - +/* static void UartReset() { Uart.byteCntMax = 3; @@ -1223,7 +1132,7 @@ static void UartReset() { Uart.posCnt = 0; memset(Uart.output, 0x00, 3); } - +*/ // static void UartInit(uint8_t *data) { // Uart.output = data; // UartReset(); @@ -1235,7 +1144,7 @@ static void UartReset() { // tag's response, which we leave in the buffer to be demodulated on the // PC side. //============================================================================= - +/* static struct { enum { DEMOD_UNSYNCD, @@ -1254,7 +1163,7 @@ static struct { int sumI; int sumQ; } Demod; - +*/ /* * Handles reception of a bit from the tag * @@ -1269,32 +1178,8 @@ static struct { * 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; @@ -1449,7 +1334,8 @@ static RAMFUNC int HandleLegicSamplesDemod(int ci, int cq) } return FALSE; } - +*/ +/* // Clear out the state of the "UART" that receives from the tag. static void DemodReset() { Demod.len = 0; @@ -1467,13 +1353,17 @@ 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; @@ -1548,9 +1438,13 @@ static void GetSamplesForLegicDemod(int n, bool quiet) 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; @@ -1597,12 +1491,13 @@ static void TransmitForLegic(void) } 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; @@ -1634,11 +1529,12 @@ static void CodeLegicBitsAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits) // 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(); @@ -1648,59 +1544,9 @@ static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int } } -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_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), 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. @@ -1729,4 +1575,5 @@ void ice_legic_setup() { // initalize prng legic_prng_init(0); -} \ No newline at end of file +} +*/ \ No newline at end of file