X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8e220a91260072f1483f1fb41d6ce64459667e4c..bd20f8f47847787e1f3e933043933272908c5beb:/armsrc/legicrf.c diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index 3f3dfbe5..c785542d 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -1,22 +1,25 @@ -/* - * LEGIC RF simulation code - * - * (c) 2009 Henryk Plötz - */ - -#include - +//----------------------------------------------------------------------------- +// (c) 2009 Henryk Plötz +// +// 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 +// the license. +//----------------------------------------------------------------------------- +// LEGIC RF simulation code +//----------------------------------------------------------------------------- + +#include "proxmark3.h" #include "apps.h" -#include "legicrf.h" -#include "unistd.h" -#include "stdint.h" +#include "util.h" +#include "string.h" +#include "legicrf.h" #include "legic_prng.h" #include "crc.h" static struct legic_frame { int bits; - uint16_t data; + uint32_t data; } current_frame; static crc_t legic_crc; @@ -54,7 +57,7 @@ static void frame_send_rwd(uint32_t data, int bits) /* Start clock */ timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ - + int i; for(i=0; iTC_CV; @@ -67,17 +70,17 @@ static void frame_send_rwd(uint32_t data, int bits) } else { bit_end = starttime + RWD_TIME_0; } - + /* RWD_TIME_PAUSE time off, then some time on, so that the complete bit time is * RWD_TIME_x, where x is the bit to be transmitted */ AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; while(timer->TC_CV < pause_end) ; AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; legic_prng_forward(1); /* bit duration is longest. use this time to forward the lfsr */ - + while(timer->TC_CV < bit_end) ; } - + { /* One final pause to mark the end of the frame */ int pause_end = timer->TC_CV + RWD_TIME_PAUSE; @@ -85,7 +88,7 @@ static void frame_send_rwd(uint32_t data, int bits) while(timer->TC_CV < pause_end) ; AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; } - + /* Reset the timer, to measure time until the start of the tag frame */ timer->TC_CCR = AT91C_TC_SWTRG; while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ @@ -93,12 +96,12 @@ static void frame_send_rwd(uint32_t data, int bits) /* 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. - * + * * The LEGIC RF protocol from card to reader does not include explicit * frame start/stop information or length information. The reader must * know beforehand how many bits it wants to receive. (Notably: a card * sending a stream of 0-bits is indistinguishable from no card present.) - * + * * Receive methodology: There is a fancy correlator in hi_read_rx_xcorr, but * I'm not smart enough to use it. Instead I have patched hi_read_tx to output * the ADC signal with hysteresis on SSP_DIN. Bit-bang that signal and look @@ -107,19 +110,19 @@ static void frame_send_rwd(uint32_t data, int bits) * 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 * with the frame that we just sent. - * - * FIXME: Because we're relying on the hysteresis to just do the right thing + * + * 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. + * 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) { - uint16_t the_bit = 1; /* Use a bitmask to save on shifts */ - uint16_t data=0; + uint32_t the_bit = 1; /* Use a bitmask to save on shifts */ + uint32_t data=0; int i, old_level=0, edges=0; int next_bit_at = TAG_TIME_WAIT; - - + + if(bits > 16) bits = 16; @@ -141,7 +144,7 @@ static void frame_receive_rwd(struct legic_frame * const f, int bits, int crypt) while(timer->TC_CV < next_bit_at) ; next_bit_at += TAG_TIME_BIT; - + for(i=0; i 20 && edges < 60) { /* expected are 42 edges */ data ^= the_bit; } the_bit <<= 1; } - + f->data = data; f->bits = bits; - + /* Reset the timer, to synchronize the next frame */ timer->TC_CCR = AT91C_TC_SWTRG; while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ @@ -174,25 +177,23 @@ static void frame_clean(struct legic_frame * const f) f->bits = 0; } -static uint16_t perform_setup_phase_rwd(int iv) +static uint32_t perform_setup_phase_rwd(int iv) { - + /* Switch on carrier and let the tag charge for 1ms */ AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; SpinDelay(1); - + legic_prng_init(0); /* no keystream yet */ frame_send_rwd(iv, 7); legic_prng_init(iv); - + frame_clean(¤t_frame); frame_receive_rwd(¤t_frame, 6, 1); legic_prng_forward(1); /* we wait anyways */ while(timer->TC_CV < 387) ; /* ~ 258us */ frame_send_rwd(0x19, 6); - if(current_frame.data != 0x1d) - Dbprintf("probably don't know how to deal with %x card", current_frame.data); return current_frame.data; } @@ -200,14 +201,14 @@ static void LegicCommonInit(void) { SetAdcMuxFor(GPIO_MUXSEL_HIPKD); FpgaSetupSsc(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - + /* Bitbang the transmitter */ AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; - + setup_timer(); - + crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); } @@ -216,32 +217,34 @@ static void switch_off_tag_rwd(void) /* Switch off carrier, make sure tag is reset */ AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; SpinDelay(10); - + WDT_HIT(); } /* calculate crc for a legic command */ -static int LegicCRC(int byte_index, int value) { +static int LegicCRC(int byte_index, int value, int cmd_sz) { crc_clear(&legic_crc); crc_update(&legic_crc, 1, 1); /* CMD_READ */ - crc_update(&legic_crc, byte_index, 8); + crc_update(&legic_crc, byte_index, cmd_sz-1); crc_update(&legic_crc, value, 8); return crc_finish(&legic_crc); } -int legic_read_byte(int byte_index) { +int legic_read_byte(int byte_index, int cmd_sz) { int byte; legic_prng_forward(4); /* we wait anyways */ while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */ - frame_send_rwd(1 | (byte_index << 1), 9); + frame_send_rwd(1 | (byte_index << 1), cmd_sz); frame_clean(¤t_frame); frame_receive_rwd(¤t_frame, 12, 1); byte = current_frame.data & 0xff; - if( LegicCRC(byte_index, byte) != (current_frame.data >> 8) ) - Dbprintf("!!! crc mismatch: expected %x but got %x !!!", LegicCRC(byte_index, current_frame.data & 0xff), current_frame.data >> 8); + if( LegicCRC(byte_index, byte, cmd_sz) != (current_frame.data >> 8) ) { + Dbprintf("!!! crc mismatch: expected %x but got %x !!!", LegicCRC(byte_index, current_frame.data & 0xff, cmd_sz), current_frame.data >> 8); + return -1; + } return byte; } @@ -256,19 +259,51 @@ int legic_read_byte(int byte_index) { void LegicRfReader(int offset, int bytes) { - int byte_index=0; - + int byte_index=0, cmd_sz=0, card_sz=0; + LegicCommonInit(); - memset(BigBuf, 0, 256); - + memset(BigBuf, 0, 1024); + DbpString("setting up legic card"); + uint32_t tag_type = perform_setup_phase_rwd(0x55); + switch(tag_type) { + case 0x1d: + DbpString("MIM 256 card found, reading card ..."); + cmd_sz = 9; + card_sz = 256; + break; + case 0x3d: + DbpString("MIM 1024 card found, reading card ..."); + cmd_sz = 11; + card_sz = 1024; + break; + default: + Dbprintf("Unknown card format: %x",tag_type); + switch_off_tag_rwd(); + return; + } + if(bytes == -1) { + bytes = card_sz; + } + if(bytes+offset >= card_sz) { + bytes = card_sz-offset; + } + + switch_off_tag_rwd(); //we lost to mutch time with dprintf perform_setup_phase_rwd(0x55); while(byte_index < bytes) { - ((uint8_t*)BigBuf)[byte_index] = legic_read_byte(byte_index+offset); + int r = legic_read_byte(byte_index+offset, cmd_sz); + if(r == -1) { + Dbprintf("aborting"); + switch_off_tag_rwd(); + return; + } + ((uint8_t*)BigBuf)[byte_index] = r; byte_index++; } switch_off_tag_rwd(); - Dbprintf("Card read, use 'data hexsamples %d' to view results", (bytes+7) & ~7); + Dbprintf("Card read, use 'hf legic decode' or 'data hexsamples %d' to view results", (bytes+7) & ~7); } +