From ad5bc8cc8c0a6573d6b2c7bc58bf94f7ab66ad4c Mon Sep 17 00:00:00 2001 From: iceman1001 Date: Fri, 9 Sep 2016 11:56:20 +0200 Subject: [PATCH] In my attempts to make the LEGIC code better, its not working now. Timings if off. CHG: switching to US clock. CHG: better trace annotation for legic CHG: Legic prng can now give a x bits in once. --- armsrc/legicrf.c | 463 ++++++++++++++++++++++--------------------- armsrc/legicrf.h | 2 + client/cmdhf.c | 1 - client/cmdhflegic.c | 27 ++- client/cmdhflegic.h | 1 + client/proxmark3.c | 17 +- common/legic_prng.c | 32 ++- common/protocols.h | 7 +- include/legic_prng.h | 1 + 9 files changed, 317 insertions(+), 234 deletions(-) diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index 1596c50c..8d84740c 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -35,63 +35,106 @@ 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; prng_timer->TC_CMR = AT91C_TC_CLKS_TIMER_DIV2_CLOCK; prng_timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; } +*/ + +// At TIMER_CLOCK3 (MCK/32) +//#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */ +//#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */ +//#define RWD_TIME_PAUSE 30 /* 20us */ + +#define RWD_TIME_1 80 /* READER_TIME_PAUSE off, 80us on = 100us */ +#define RWD_TIME_0 40 /* READER_TIME_PAUSE off, 40us on = 60us */ +#define RWD_TIME_PAUSE 20 /* 20us */ + +#define TAG_BIT_PERIOD 100 // 100us for every bit -/* At TIMER_CLOCK3 (MCK/32) */ -#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */ -#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */ -#define RWD_TIME_PAUSE 30 /* 20us */ #define RWD_TIME_FUZZ 20 /* rather generous 13us, since the peak detector + hysteresis fuzz quite a bit */ -#define TAG_TIME_BIT 150 /* 100us for every bit */ -#define TAG_TIME_WAIT 490 /* 490 time from RWD frame end to tag frame start, experimentally determined */ + + +//#define TAG_TIME_WAIT 490 /* 490 time from READER frame end to TAG frame start, experimentally determined */ +#define TAG_TIME_WAIT 258 // 330us from READER frame end to TAG frame start, experimentally determined +#define RDW_TIME_WAIT 258 // + #define SIM_DIVISOR 586 /* prng_time/SIM_DIVISOR count prng needs to be forwared */ #define SIM_SHIFT 900 /* prng_time+SIM_SHIFT shift of delayed start */ -#define SESSION_IV 0x55 #define OFFSET_LOG 1024 #define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz))) +#ifndef SHORT_COIL +//#define LOW(x) AT91C_BASE_PIOA->PIO_CODR = (x) +# define SHORT_COIL() LOW(GPIO_SSC_DOUT); +#endif +#ifndef OPEN_COIL +//#define HIGH(x) AT91C_BASE_PIOA->PIO_SODR = (x) +# define OPEN_COIL() HIGH(GPIO_SSC_DOUT); +#endif + +uint32_t stop_send_frame_us = 0; + // ~ 258us + 100us*delay -#define WAIT_387 WAIT(387) -#define WAIT(delay) while(timer->TC_CV < (delay) ); +#define WAIT(delay) SpinDelayUs(delay); +#define WAIT_100 WAIT(100) +#define COIL_PULSE(delay) \ + SHORT_COIL() \ + SpinDelayUs(RWD_TIME_PAUSE); \ + OPEN_COIL() \ + SpinDelayUs(delay); // ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. // Historically it used to be FREE_BUFFER_SIZE, which was 2744. #define LEGIC_CARD_MEMSIZE 1024 static uint8_t* cardmem; -/* -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) -*/ - +// Starts Clock and waits until its reset +static void Reset(AT91PS_TC clock){ + clock->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + while(clock->TC_CV > 1) ; +} + +// Starts Clock and waits until its reset +static void ResetClock(void){ + Reset(timer); +} + +// Prng works when waiting in 99.1us cycles. +// and while sending/receiving in bit frames (100, 60) +static void CalibratePrng( uint32_t time){ + // Calculate Cycles based on timer 100us + uint32_t i = (time - stop_send_frame_us) / 100 ; + + // substract cycles of finished frames + int k = i - legic_prng_count()+1; + + // substract current frame length, rewind to beginning + if ( k > 0 ) + legic_prng_forward(k); +} + /* Generate Keystream */ static uint32_t get_key_stream(int skip, int count) { @@ -102,8 +145,7 @@ static uint32_t get_key_stream(int skip, int count) legic_prng_bc += prng_timer->TC_CV; // reset the prng timer. - prng_timer->TC_CCR = AT91C_TC_SWTRG; - while(prng_timer->TC_CV > 1) ; + Reset(prng_timer); /* If skip == -1, forward prng time based */ if(skip == -1) { @@ -137,109 +179,77 @@ static uint32_t get_key_stream(int skip, int 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 key = 0; - for(int i = 0; i < bits; i++) { - key |= legic_prng_get_bit() << i; - legic_prng_forward(1); - } - response = response ^ key; - } - - /* 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; -} +static void frame_send_tag(uint16_t response, uint8_t bits, uint8_t crypt) { + /* Bitbang the response */ + LOW(GPIO_SSC_DOUT); + AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; -// 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) ; -} + /* Use time to crypt frame */ + if(crypt) { + legic_prng_forward(2); /* TAG_TIME_WAIT -> shift by 2 */ + response ^= legic_prng_get_bits(bits); + } -/* 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){ + /* Wait for the frame start */ + WAIT( TAG_TIME_WAIT ) - uint8_t bit = 0; - uint32_t starttime = 0, pause_end = 0, bit_end = 0, temp = data; - ResetClock(); - + uint8_t bit = 0; for(int i = 0; i < bits; i++) { - starttime = timer->TC_CV; - pause_end = starttime + RWD_TIME_PAUSE; - bit = temp & 1; - temp >>= 1; + bit = response & 1; + response >>= 1; - if(bit ^ legic_prng_get_bit()) - bit_end = starttime + RWD_TIME_1; + if (bit) + HIGH(GPIO_SSC_DOUT); 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; + LOW(GPIO_SSC_DOUT); + + WAIT_100 + } + LOW(GPIO_SSC_DOUT); +} - WAIT( pause_end ) - - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; +/* 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){ - // bit duration is longest. use this time to forward the lfsr - legic_prng_forward(1); + uint32_t starttime = GetCountUS(); + uint32_t send = data; + uint8_t prng1 = legic_prng_count() ; + uint16_t mask = 1; + uint16_t lfsr = legic_prng_get_bits(bits); - WAIT( bit_end ) + // xor the lsfr onto data. + send ^= lfsr; + + for (; mask < BITMASK(bits); mask <<= 1) { + if (send & mask) { + COIL_PULSE(RWD_TIME_1) + } else { + COIL_PULSE(RWD_TIME_0) + } } // One final pause to mark the end of the frame - pause_end = timer->TC_CV + RWD_TIME_PAUSE; - - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - - WAIT(pause_end) - - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; + COIL_PULSE(0) // 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(); + stop_send_frame_us = GetCountUS(); + uint8_t cmdbytes[] = { + data & 0xFF, + (data >> 8) & 0xFF, + lfsr & 0xFF, + (lfsr >> 8) & 0xFF, + prng1, + legic_prng_count() + }; + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, TRUE); } /* Receive a frame from the card in reader emulation mode, the FPGA and - * timer must have been set up by LegicRfReader and frame_send_rwd. + * timer must have been set up by LegicRfReader and frame_sendAsReader. * * The LEGIC RF protocol from card to reader does not include explicit * frame start/stop information or length information. The reader must @@ -252,58 +262,68 @@ 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; - - 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; +static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, uint8_t crypt) { + + uint32_t starttime = GetCountUS(); + uint8_t i = 0; + uint32_t the_bit = 1; + uint32_t next_bit_at; + uint32_t data;/* Use a bitmask to save on shifts */ + + int old_level = 0, edges = 0, level = 0; + if(bits > 32) bits = 32; 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 */ - legic_prng_forward(2); - - if(crypt) { - for(i=0; i TAG_TIME_WAIT) + // icetime = TAG_TIME_WAIT; + //WAIT( icetime ) + + next_bit_at = GetCountUS(); + next_bit_at += TAG_BIT_PERIOD; + + for( i = 0; i < bits; i++) { edges = 0; - while(timer->TC_CV < next_bit_at) { - level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); - if(level != old_level) + while ( GetCountUS() < next_bit_at) { + + level = AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN; + + if (level != old_level) edges++; old_level = level; } - next_bit_at += TAG_TIME_BIT; + next_bit_at += TAG_BIT_PERIOD; - // We expect 42 edges + // We expect 42 edges == ONE if(edges > 20 && edges < 60) { + DbpString("one"); data ^= the_bit; - } + } the_bit <<= 1; } @@ -311,11 +331,15 @@ static void frame_receive_rwd(struct legic_frame * const f, int bits, int crypt) 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(); + uint8_t cmdbytes[] = { + (data & 0xFF), + (data >> 8) & 0xFF, + (lsfr & 0xFF), + (lsfr >> 8) & 0xFF, + prng1, + legic_prng_count() + }; + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GetCountUS(), NULL, FALSE); } static void frame_append_bit(struct legic_frame * const f, int bit) { @@ -335,46 +359,54 @@ static void frame_clean(struct legic_frame * const f) { static uint32_t perform_setup_phase_rwd(uint8_t iv) { // Switch on carrier and let the tag charge for 1ms - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - SpinDelay(20); // was 1ms before. - + HIGH(GPIO_SSC_DOUT); + SpinDelay(40); + + ResetUSClock(); + // 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); - // we wait anyways - legic_prng_forward(3); - - WAIT(387) + frame_receiveAsReader(¤t_frame, 6, 1); + // fixed delay before sending ack. + WAIT(TAG_BIT_PERIOD); + // 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; } - return current_frame.data; + + // End of Setup Phase. } -static void LegicCommonInit(void) { - +static void LegicCommonInit(void) { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); FpgaSetupSsc(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); /* Bitbang the transmitter */ - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; + LOW(GPIO_SSC_DOUT); AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; @@ -384,15 +416,15 @@ static void LegicCommonInit(void) { clear_trace(); set_tracing(TRUE); - - setup_timer(); crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); + + StartCountUS(); } /* Switch off carrier, make sure tag is reset */ static void switch_off_tag_rwd(void) { - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; + LOW(GPIO_SSC_DOUT); SpinDelay(10); WDT_HIT(); } @@ -400,31 +432,29 @@ static void switch_off_tag_rwd(void) { // 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); + crc_clear(&legic_crc); + uint32_t temp = (value << cmd_sz) | (byte_index << 1) | LEGIC_READ; + crc_update(&legic_crc, temp, cmd_sz + 8 ); + // crc_update(&legic_crc, LEGIC_READ, 1); + // crc_update(&legic_crc, byte_index, cmd_sz-1); + // crc_update(&legic_crc, value, 8); return crc_finish(&legic_crc); } -#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; + int calcCrc = 0; + uint8_t byte = 0, crc = 0; uint32_t cmd = (byte_index << 1) | LEGIC_READ; - WAIT_387 + legic_prng_forward(3); + WAIT(300) - // send read command - frame_send_rwd(cmd, cmd_sz); + frame_sendAsReader(cmd, cmd_sz); frame_clean(¤t_frame); - // receive - frame_receive_rwd(¤t_frame, 12, 1); + frame_receiveAsReader(¤t_frame, 12, 1); byte = current_frame.data & 0xff; calcCrc = LegicCRC(byte_index, byte, cmd_sz); @@ -435,8 +465,6 @@ int legic_read_byte(int byte_index, int cmd_sz) { return -1; } - // we wait anyways - legic_prng_forward(4); return byte; } @@ -469,7 +497,7 @@ int legic_write_byte(int byte, int addr, int addr_sz) { while(timer->TC_CV < 387) ; /* ~ 258us */ - frame_send_rwd(cmd, cmd_sz); + frame_sendAsReader(cmd, cmd_sz); // wllm-rbnt doesnt have these // AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; @@ -483,7 +511,7 @@ int legic_write_byte(int byte, int addr, int addr_sz) { 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) { @@ -493,7 +521,7 @@ int legic_write_byte(int byte, int addr, int addr_sz) { } if(edges > 20 && edges < 60) { /* expected are 42 edges */ int t = timer->TC_CV; - int c = t / TAG_TIME_BIT; + int c = t / TAG_BIT_PERIOD; ResetClock(); legic_prng_forward(c); @@ -507,20 +535,17 @@ int legic_write_byte(int byte, int addr, int addr_sz) { int LegicRfReader(int offset, int bytes, int iv) { - // ice_legic_setup(); - // ice_legic_select_card(); - // return 0; int byte_index = 0, cmd_sz = 0, card_sz = 0; + if ( MF_DBGLEVEL >= 2) Dbprintf("setting up legic card, IV = %x", iv); + 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 ..."); @@ -539,7 +564,7 @@ int LegicRfReader(int offset, int bytes, int iv) { break; default: if ( MF_DBGLEVEL >= 1) Dbprintf("Unknown card format: %x",tag_type); - return -1; + return 1; } if(bytes == -1) bytes = card_sz; @@ -547,18 +572,19 @@ int LegicRfReader(int offset, int bytes, int iv) { if(bytes+offset >= card_sz) bytes = card_sz - offset; + // Start setup and read bytes. perform_setup_phase_rwd(iv); - legic_prng_forward(2); - LED_B_ON(); - while(byte_index < bytes) { + while (byte_index < bytes) { int r = legic_read_byte(byte_index+offset, cmd_sz); - if(r == -1 || BUTTON_PRESS()) { + + if (r == -1 || BUTTON_PRESS()) { switch_off_tag_rwd(); LEDsoff(); if ( MF_DBGLEVEL >= 2) DbpString("operation aborted"); - return -1; + cmd_send(CMD_ACK,0,0,0,0,0); + return 1; } cardmem[byte_index] = r; WDT_HIT(); @@ -567,9 +593,8 @@ int LegicRfReader(int offset, int bytes, int iv) { 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); + uint8_t len = (bytes & 0x3FF); + cmd_send(CMD_ACK,1,len,0,0,0); return 0; } @@ -577,7 +602,7 @@ int LegicRfReader(int offset, int bytes, int iv) { int byte_index=0; LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); + perform_setup_phase_rwd(iv); //legic_prng_forward(2); while(byte_index < bytes) { int r; @@ -616,9 +641,7 @@ int LegicRfReader(int offset, int bytes, int iv) { void LegicRfWriter(int offset, int bytes, int iv) { - int byte_index = 0, addr_sz = 0; - - iv = (iv <=0 ) ? SESSION_IV : iv; + int byte_index = 0, addr_sz = 0; LegicCommonInit(); @@ -695,8 +718,6 @@ void LegicRfWriter(int offset, int bytes, int iv) { void LegicRfRawWriter(int address, int byte, int iv) { int byte_index = 0, addr_sz = 0; - - iv = (iv <= 0) ? SESSION_IV : iv; LegicCommonInit(); @@ -767,11 +788,11 @@ static void frame_handle_tag(struct legic_frame const * const f) LED_C_ON(); - prng_timer->TC_CCR = AT91C_TC_SWTRG; - while(prng_timer->TC_CV > 1) ; + // Reset prng timer + Reset(prng_timer); legic_prng_init(f->data); - frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1b */ + frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1B */ legic_state = STATE_IV; legic_read_count = 0; legic_prng_bc = 0; @@ -924,7 +945,7 @@ 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; @@ -1654,7 +1675,7 @@ int ice_legic_select_card() uint8_t wakeup[] = { 0x7F }; uint8_t getid[] = {0x19}; - legic_prng_init(SESSION_IV); + //legic_prng_init(SESSION_IV); // first, wake up the tag, 7bits CodeAndTransmitLegicAsReader(wakeup, sizeof(wakeup), 7); @@ -1662,12 +1683,12 @@ int ice_legic_select_card() GetSamplesForLegicDemod(1000, TRUE); // frame_clean(¤t_frame); - //frame_receive_rwd(¤t_frame, 6, 1); + //frame_receiveAsReader(¤t_frame, 6, 1); legic_prng_forward(1); /* we wait anyways */ //while(timer->TC_CV < 387) ; /* ~ 258us */ - //frame_send_rwd(0x19, 6); + //frame_sendAsReader(0x19, 6); CodeAndTransmitLegicAsReader(getid, sizeof(getid), 8); GetSamplesForLegicDemod(1000, TRUE); diff --git a/armsrc/legicrf.h b/armsrc/legicrf.h index e00de6ac..4e3177ee 100644 --- a/armsrc/legicrf.h +++ b/armsrc/legicrf.h @@ -18,6 +18,8 @@ #include "legic_prng.h" // legic PRNG impl #include "crc.h" // legic crc-4 +#define LEGIC_READ 0x01 +#define LEGIC_WRITE 0x00 extern void LegicRfSimulate(int phase, int frame, int reqresp); extern int LegicRfReader(int offset, int bytes, int iv); diff --git a/client/cmdhf.c b/client/cmdhf.c index db0fbf95..95d4f53a 100644 --- a/client/cmdhf.c +++ b/client/cmdhf.c @@ -652,7 +652,6 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui uint8_t parityBits = parityBytes[j>>3]; if (protocol != ISO_14443B && protocol != ISO_7816_4 && (isResponse || protocol == ISO_14443A) && (oddparity != ((parityBits >> (7-(j&0x0007))) & 0x01))) { snprintf(line[j/16]+(( j % 16) * 4),110, "%02x! ", frame[j]); - } else { snprintf(line[j/16]+(( j % 16) * 4),110, "%02x ", frame[j]); } diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c index 7b75f91c..bbdd091e 100644 --- a/client/cmdhflegic.c +++ b/client/cmdhflegic.c @@ -403,9 +403,34 @@ int CmdLegicRFRead(const char *Cmd) { } PrintAndLog("Current IV: 0x%02x", IV); - UsbCommand c= {CMD_READER_LEGIC_RF, {offset, len, IV}}; + // get some prng bytes from + uint8_t temp[12]; + legic_prng_init(IV); + for ( uint8_t j = 0; j < sizeof(temp); ++j) + temp[j] = legic_prng_get_bits(8); + + PrintAndLog("PRNG: %s", sprint_hex(temp, sizeof(temp))); + + UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}}; clearCommandBuffer(); SendCommand(&c); + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) { + uint8_t isOK = resp.arg[0] & 0xFF; + uint16_t len = resp.arg[1] & 0x3FF; + if ( isOK ) { + PrintAndLog("OK : %d", isOK); + PrintAndLog("use 'hf legic decode' or"); + PrintAndLog("'data hexsamples %d' to view results", len); + } + } else { + PrintAndLog("command execution time out"); + return 1; + } + + //uint8_t got[12000]; + //GetFromBigBuf(got,sizeof(got),0); + //WaitForResponse(CMD_ACK,NULL); return 0; } diff --git a/client/cmdhflegic.h b/client/cmdhflegic.h index a22de93d..60818f61 100644 --- a/client/cmdhflegic.h +++ b/client/cmdhflegic.h @@ -20,6 +20,7 @@ #include "cmdmain.h" #include "util.h" #include "crc.h" +#include "legic_prng.h" int CmdHFLegic(const char *Cmd); diff --git a/client/proxmark3.c b/client/proxmark3.c index 0fa55425..0bd8ff9d 100644 --- a/client/proxmark3.c +++ b/client/proxmark3.c @@ -54,17 +54,27 @@ void SendCommand(UsbCommand *c) { } struct receiver_arg { - int run; + int run; }; struct main_loop_arg { - int usb_present; - char *script_cmds_file; + int usb_present; + char *script_cmds_file; }; byte_t rx[0x1000000]; byte_t* prx = rx; +// static void showBanner(void){ + // printf("██████╗ ███╗ ███╗ ████╗ ...Iceman fork\n"); + // printf("██╔══██╗████╗ ████║ ══█║\n"); + // printf("██████╔╝██╔████╔██║ ████╔╝\n"); + // printf("██╔═══╝ ██║╚██╔╝██║ ══█║ iceman@icesql.net\n"); + // printf("██║ ██║ ╚═╝ ██║ ████╔╝ https://github.com/iceman1001/proxmark3\n"); + // printf("╚═╝ ╚═╝ ╚═╝ ╚═══╝v1.6.4\n"); +// } + + static void *uart_receiver(void *targ) { struct receiver_arg *arg = (struct receiver_arg*)targ; size_t rxlen; @@ -105,6 +115,7 @@ static void *main_loop(void *targ) { char *cmd = NULL; pthread_t reader_thread; + if (arg->usb_present == 1) { rarg.run = 1; pthread_create(&reader_thread, NULL, &uart_receiver, &rarg); diff --git a/common/legic_prng.c b/common/legic_prng.c index 93229251..16e55331 100644 --- a/common/legic_prng.c +++ b/common/legic_prng.c @@ -7,22 +7,35 @@ //----------------------------------------------------------------------------- #include "legic_prng.h" - +// a is 7bit +// b is +// c is a counter struct lfsr { uint8_t a; uint8_t b; uint32_t c; } lfsr; -void legic_prng_init(uint8_t init) { - lfsr.a = init; +// Normal init is set following variables with a random value IV +// a == iv +// b == iv << 1 | 1 +// * someone mentioned iv must be ODD. +// Hack: +// Now we have a special case with iv == 0 +// it sets b to 0 aswell to make sure we get a all zero keystream out +// which is used in the initialisation phase sending the IV +// +void legic_prng_init(uint8_t iv) { + lfsr.a = iv; lfsr.b = 0; // hack to get a always 0 keystream lfsr.c = 0; - if(init) - lfsr.b = (init << 1) | 1; + if(iv) + lfsr.b = (iv << 1) | 1; } void legic_prng_forward(int count) { + if (count == 0) return; + lfsr.c += count; while(count--) { // According: http://www.proxmark.org/forum/viewtopic.php?pid=5437#p5437 @@ -38,4 +51,13 @@ uint32_t legic_prng_count() { uint8_t legic_prng_get_bit() { uint8_t idx = 7 - ( (lfsr.a & 4) | (lfsr.a >> 2 & 2) | (lfsr.a >> 4 & 1) ); return lfsr.b >> idx & 1; +} + +uint32_t legic_prng_get_bits(uint8_t len){ + uint32_t a = 0; + for(uint8_t i = 0; i < len; ++i) { + a |= legic_prng_get_bit() << i; + legic_prng_forward(1); + } + return a; } \ No newline at end of file diff --git a/common/protocols.h b/common/protocols.h index 37d12525..38c72fc0 100644 --- a/common/protocols.h +++ b/common/protocols.h @@ -326,9 +326,10 @@ ISO 7816-4 Basic interindustry commands. For command APDU's. #define MFDES_AUTHENTICATION_FRAME 0xAF // LEGIC Commands -#define LEGIC_HSK 0x39 -#define LEGIC_READ 0x01 -#define LEGIC_WRITE 0x00 +#define LEGIC_HSK_22 0x19 +#define LEGIC_HSK_256 0x39 +#define LEGIC_READ 0x01 +#define LEGIC_WRITE 0x00 void printIclassDumpInfo(uint8_t* iclass_dump); void getMemConfig(uint8_t mem_cfg, uint8_t chip_cfg, uint8_t *max_blk, uint8_t *app_areas, uint8_t *kb); diff --git a/include/legic_prng.h b/include/legic_prng.h index b9e778a6..85d40e79 100644 --- a/include/legic_prng.h +++ b/include/legic_prng.h @@ -14,5 +14,6 @@ extern void legic_prng_init(uint8_t init); extern void legic_prng_forward(int count); extern uint32_t legic_prng_count(); extern uint8_t legic_prng_get_bit(); +extern uint32_t legic_prng_get_bits(uint8_t len); #endif -- 2.39.2