X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/111c6934d4e5c58883d08210399afe8eaeccc5c3..4490a4769074e6b5a91f9da1bee2296ac2b42f5f:/armsrc/legicrf.c diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index 572a870e..2883bdfc 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -98,7 +98,7 @@ static void setup_timer(void) { # define OPEN_COIL HIGH(GPIO_SSC_DOUT); #endif -uint32_t stop_send_frame_us = 0; +uint32_t sendFrameStop = 0; // Pause pulse, off in 20us / 30ticks, // ONE / ZERO bit pulse, @@ -154,7 +154,7 @@ static void frame_clean(struct legic_frame * const f) { // 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; @@ -263,7 +263,7 @@ static void frame_sendAsReader(uint32_t data, uint8_t bits){ // Final pause to mark the end of the frame COIL_PULSE(0); - stop_send_frame_us = GET_TICKS; + sendFrameStop = GET_TICKS; uint8_t cmdbytes[] = { BYTEx(data, 0), BYTEx(data, 1), @@ -271,7 +271,7 @@ static void frame_sendAsReader(uint32_t data, uint8_t bits){ prng1, legic_prng_count() }; - LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, TRUE); + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, sendFrameStop, NULL, TRUE); } /* Receive a frame from the card in reader emulation mode, the FPGA and @@ -320,7 +320,8 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { data = lsfr; //FIXED time between sending frame and now listening frame. 330us - Wait( TAG_FRAME_WAIT ); + Wait( TAG_FRAME_WAIT - ( GET_TICKS - sendFrameStop ) ); + //Wait( TAG_FRAME_WAIT ); uint32_t starttime = GET_TICKS; @@ -340,10 +341,10 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { next_bit_at += TAG_BIT_PERIOD; // We expect 42 edges == ONE - if(edges > 20 && edges < 60) { + if(edges > 20 && edges < 64) data ^= the_bit; - } - the_bit <<= 1; + + the_bit <<= 1; } // output @@ -351,7 +352,7 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { f->bits = bits; // log - stop_send_frame_us = GET_TICKS; + sendFrameStop = GET_TICKS; uint8_t cmdbytes[] = { BYTEx(data,0), @@ -359,18 +360,20 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { bits, BYTEx(lsfr,0), BYTEx(lsfr,1), + BYTEx(data, 0) ^ BYTEx(lsfr,0), + BYTEx(data, 1) ^ BYTEx(lsfr,1), prng_before, legic_prng_count() }; - LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, FALSE); + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, sendFrameStop, 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); + SpinDelay(300); ResetUSClock(); @@ -386,24 +389,23 @@ static uint32_t perform_setup_phase_rwd(uint8_t iv) { frame_receiveAsReader(¤t_frame, 6); // fixed delay before sending ack. - Wait(TAG_FRAME_WAIT); - legic_prng_forward(4); + Wait(360); // 240us = 360tick + legic_prng_forward(2); //240us / 100 == 2.4 iterations // 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; } return current_frame.data; + + // fixed delay after setup phase. + Wait(375); // 260us == 375 ticks + legic_prng_forward(2);// 260us / 100 == 2.6 iterations } static void LegicCommonInit(void) { @@ -439,19 +441,19 @@ static void switch_off_tag_rwd(void) { // 5,8,10 address size. static uint32_t legic4Crc(uint8_t legicCmd, 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; - crc_update(&legic_crc, temp, cmd_sz + 8 ); + //uint32_t temp = (value << cmd_sz) | (byte_index << 1) | legicCmd; + //crc_update(&legic_crc, temp, cmd_sz + 8 ); + crc_update(&legic_crc, 1, 1); /* CMD_READ */ + 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 cmd_sz) { - uint8_t byte = 0, crc = 0; - uint32_t calcCrc = 0; + uint8_t byte = 0, crc = 0, calcCrc = 0; uint32_t cmd = (byte_index << 1) | LEGIC_READ; - Wait(TAG_FRAME_WAIT); - frame_sendAsReader(cmd, cmd_sz); frame_receiveAsReader(¤t_frame, 12); @@ -463,7 +465,10 @@ int legic_read_byte(int byte_index, int cmd_sz) { Dbprintf("!!! crc mismatch: expected %x but got %x !!!", calcCrc, crc); return -1; } - legic_prng_forward(4); + + Wait(690); // 460us == 690ticks + legic_prng_forward(4); // 460 / 100 = 4.6 iterations + return byte; } @@ -542,13 +547,14 @@ int LegicRfReader(int offset, int bytes, int iv) { uint16_t byte_index = 0; uint8_t cmd_sz = 0; int card_sz = 0; - + uint8_t isOK = 1; + if ( MF_DBGLEVEL >= 2) - Dbprintf("setting up legic card, IV = 0x%03.3x", iv); + Dbprintf("setting up legic card, IV = 0x%02x", iv); LegicCommonInit(); - uint32_t tag_type = perform_setup_phase_rwd(iv); + uint32_t tag_type = setup_phase_reader(iv); //we lose to mutch time with dprintf switch_off_tag_rwd(); @@ -571,7 +577,9 @@ int LegicRfReader(int offset, int bytes, int iv) { break; default: if ( MF_DBGLEVEL >= 1) Dbprintf("Unknown card format: %x", tag_type); - return 1; + isOK = 0; + goto OUT; + break; } if (bytes == -1) bytes = card_sz; @@ -580,28 +588,27 @@ int LegicRfReader(int offset, int bytes, int iv) { bytes = card_sz - offset; // Start setup and read bytes. - perform_setup_phase_rwd(iv); - + 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(); 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++; + //byte_index++; WDT_HIT(); } +OUT: 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; } @@ -609,7 +616,7 @@ int LegicRfReader(int offset, int bytes, int iv) { int byte_index=0; LED_B_ON(); - perform_setup_phase_rwd(iv); + setup_phase_reader(iv); //legic_prng_forward(2); while(byte_index < bytes) { int r; @@ -654,7 +661,7 @@ void LegicRfWriter(int offset, int bytes, int iv) { if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(iv); + uint32_t tag_type = setup_phase_reader(iv); switch_off_tag_rwd(); @@ -689,7 +696,7 @@ void LegicRfWriter(int offset, int bytes, int iv) { } LED_B_ON(); - perform_setup_phase_rwd(iv); + setup_phase_reader(iv); int r = 0; while(byte_index < bytes) { @@ -730,7 +737,7 @@ void LegicRfRawWriter(int address, int byte, int iv) { if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(iv); + uint32_t tag_type = setup_phase_reader(iv); switch_off_tag_rwd(); @@ -767,7 +774,7 @@ void LegicRfRawWriter(int address, int byte, int iv) { Dbprintf("integer value: %d address: %d addr_sz: %d", byte, address, addr_sz); LED_B_ON(); - perform_setup_phase_rwd(iv); + setup_phase_reader(iv); int r = legic_write_byte(byte, address, addr_sz);