X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/cef590d9efd4957aead4be551fc8af1c37188311..fd3be901ea022a368eddd3e08126f4d06f17d64a:/armsrc/iso14443b.c diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 72c71964..e45402bc 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -8,19 +8,40 @@ // Routines to support ISO 14443B. This includes both the reader software and // the `fake tag' modes. //----------------------------------------------------------------------------- +#include "iso14443b.h" -#include "proxmark3.h" -#include "apps.h" -#include "util.h" -#include "string.h" -#include "iso14443crc.h" -#include "common.h" -#define RECEIVE_SAMPLES_TIMEOUT 20000 +#define RECEIVE_SAMPLES_TIMEOUT 50000 #define ISO14443B_DMA_BUFFER_SIZE 256 -// PCB Block number for APDUs +// Guard Time (per 14443-2) +#define TR0 0 +// Synchronization time (per 14443-2) +#define TR1 0 +// Frame Delay Time PICC to PCD (per 14443-3 Amendment 1) +#define TR2 0 +static void switch_off(void); + +// the block number for the ISO14443-4 PCB (used with APDUs) static uint8_t pcb_blocknum = 0; +static uint32_t iso14b_timeout = RECEIVE_SAMPLES_TIMEOUT; +// param timeout is in ftw_ +void iso14b_set_timeout(uint32_t timeout) { + // 9.4395us = 1etu. + // clock is about 1.5 us + iso14b_timeout = timeout; + if(MF_DBGLEVEL >= 2) Dbprintf("ISO14443B Timeout set to %ld fwt", iso14b_timeout); +} + +static void switch_off(void){ + if (MF_DBGLEVEL > 3) Dbprintf("switch_off"); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(100); + FpgaDisableSscDma(); + set_tracing(FALSE); + LEDsoff(); +} + //============================================================================= // An ISO 14443 Type B tag. We listen for commands from the reader, using // a UART kind of thing that's implemented in software. When we get a @@ -31,8 +52,7 @@ static uint8_t pcb_blocknum = 0; //----------------------------------------------------------------------------- -// The software UART that receives commands from the reader, and its state -// variables. +// The software UART that receives commands from the reader, and its state variables. //----------------------------------------------------------------------------- static struct { enum { @@ -41,31 +61,32 @@ static struct { STATE_AWAITING_START_BIT, STATE_RECEIVING_DATA } state; - uint16_t shiftReg; - int bitCnt; - int byteCnt; - int byteCntMax; - int posCnt; - uint8_t *output; + uint16_t shiftReg; + int bitCnt; + int byteCnt; + int byteCntMax; + int posCnt; + uint8_t *output; } Uart; -static void UartReset() -{ - Uart.byteCntMax = MAX_FRAME_SIZE; +static void UartReset() { Uart.state = STATE_UNSYNCD; - Uart.byteCnt = 0; + Uart.shiftReg = 0; Uart.bitCnt = 0; + Uart.byteCnt = 0; + Uart.byteCntMax = MAX_FRAME_SIZE; Uart.posCnt = 0; - memset(Uart.output, 0x00, MAX_FRAME_SIZE); } -static void UartInit(uint8_t *data) -{ +static void UartInit(uint8_t *data) { Uart.output = data; UartReset(); +// memset(Uart.output, 0x00, MAX_FRAME_SIZE); } - +//----------------------------------------------------------------------------- +// The software Demod that receives commands from the tag, and its state variables. +//----------------------------------------------------------------------------- static struct { enum { DEMOD_UNSYNCD, @@ -75,82 +96,146 @@ static struct { DEMOD_AWAITING_START_BIT, DEMOD_RECEIVING_DATA } state; - int bitCount; - int posCount; - int thisBit; + uint16_t bitCount; + int posCount; + int thisBit; /* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented. int metric; int metricN; */ - uint16_t shiftReg; - uint8_t *output; - int len; - int sumI; - int sumQ; + uint16_t shiftReg; + uint8_t *output; + uint16_t len; + int sumI; + int sumQ; + uint32_t startTime, endTime; } Demod; -static void DemodReset() -{ - // Clear out the state of the "UART" that receives from the tag. - Demod.len = 0; +// Clear out the state of the "UART" that receives from the tag. +static void DemodReset() { Demod.state = DEMOD_UNSYNCD; - Demod.posCount = 0; - Demod.sumI = 0; - Demod.sumQ = 0; Demod.bitCount = 0; + Demod.posCount = 0; Demod.thisBit = 0; Demod.shiftReg = 0; - memset(Demod.output, 0x00, MAX_FRAME_SIZE); + Demod.len = 0; + Demod.sumI = 0; + Demod.sumQ = 0; + Demod.startTime = 0; + Demod.endTime = 0; } - -static void DemodInit(uint8_t *data) -{ +static void DemodInit(uint8_t *data) { Demod.output = data; DemodReset(); + // memset(Demod.output, 0x00, MAX_FRAME_SIZE); } +void AppendCrc14443b(uint8_t* data, int len) { + ComputeCrc14443(CRC_14443_B,data,len,data+len,data+len+1); +} //----------------------------------------------------------------------------- // 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 // them yet, just leaves them ready to send in ToSend[]. //----------------------------------------------------------------------------- -static void CodeIso14443bAsTag(const uint8_t *cmd, int len) -{ - int i; - +static void CodeIso14443bAsTag(const uint8_t *cmd, int len) { + /* ISO 14443 B + * + * Reader to card | ASK - Amplitude Shift Keying Modulation (PCD to PICC for Type B) (NRZ-L encodig) + * Card to reader | BPSK - Binary Phase Shift Keying Modulation, (PICC to PCD for Type B) + * + * fc - carrier frequency 13.56mHz + * TR0 - Guard Time per 14443-2 + * TR1 - Synchronization Time per 14443-2 + * TR2 - PICC to PCD Frame Delay Time (per 14443-3 Amendment 1) + * + * Elementary Time Unit (ETU) is + * - 128 Carrier Cycles (9.4395 µS) = 8 Subcarrier Units + * - 1 ETU = 1 bit + * - 10 ETU = 1 startbit, 8 databits, 1 stopbit (10bits length) + * - startbit is a 0 + * - stopbit is a 1 + * + * Start of frame (SOF) is + * - [10-11] ETU of ZEROS, unmodulated time + * - [2-3] ETU of ONES, + * + * End of frame (EOF) is + * - [10-11] ETU of ZEROS, unmodulated time + * + * -TO VERIFY THIS BELOW- + * The mode FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK which we use to simulate tag + * works like this: + * - A 1-bit input to the FPGA becomes 8 pulses at 847.5kHz (9.44µS) + * - A 0-bit input to the FPGA becomes an unmodulated time of 9.44µS + * + * + * + * Card sends data ub 847.e kHz subcarrier + * 848k = 9.44µS = 128 fc + * 424k = 18.88µS = 256 fc + * 212k = 37.76µS = 512 fc + * 106k = 75.52µS = 1024 fc + * + * Reader data transmission: + * - no modulation ONES + * - SOF + * - Command, data and CRC_B + * - EOF + * - no modulation ONES + * + * Card data transmission + * - TR1 + * - SOF + * - data (each bytes is: 1startbit,8bits, 1stopbit) + * - CRC_B + * - EOF + * + * FPGA implementation : + * At this point only Type A is implemented. This means that we are using a + * bit rate of 106 kbit/s, or fc/128. Oversample by 4, which ought to make + * things practical for the ARM (fc/32, 423.8 kbits/s, ~50 kbytes/s) + * + */ + + // ToSendStuffBit, 40 calls + // 1 ETU = 1startbit, 1stopbit, 8databits == 10bits. + // 1 ETU = 10 * 4 == 40 stuffbits ( ETU_TAG_BIT ) + int i,j; + uint8_t b; + ToSendReset(); // Transmit a burst of ones, as the initial thing that lets the - // reader get phase sync. This (TR1) must be > 80/fs, per spec, - // but tag that I've tried (a Paypass) exceeds that by a fair bit, - // so I will too. - for(i = 0; i < 20; i++) { - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - } + // reader get phase sync. + // This loop is TR1, per specification + // TR1 minimum must be > 80/fs + // TR1 maximum 200/fs + // 80/fs < TR1 < 200/fs + // 10 ETU < TR1 < 24 ETU // Send SOF. + // 10-11 ETU * 4times samples ZEROS for(i = 0; i < 10; i++) { ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); } - for(i = 0; i < 2; i++) { + + // 2-3 ETU * 4times samples ONES + for(i = 0; i < 3; i++) { ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); } - - for(i = 0; i < len; i++) { - int j; - uint8_t b = cmd[i]; - + + // data + for(i = 0; i < len; ++i) { + // Start bit ToSendStuffBit(0); ToSendStuffBit(0); @@ -158,7 +243,8 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) ToSendStuffBit(0); // Data bits - for(j = 0; j < 8; j++) { + b = cmd[i]; + for(j = 0; j < 8; ++j) { if(b & 1) { ToSendStuffBit(1); ToSendStuffBit(1); @@ -178,28 +264,40 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); + + // Extra Guard bit + // For PICC it ranges 0-18us (1etu = 9us) + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(1); + + ToSendStuffBit(1); + ToSendStuffBit(1); } // Send EOF. + // 10-11 ETU * 4 sample rate = ZEROS for(i = 0; i < 10; i++) { ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); } - for(i = 0; i < 2; i++) { + + // why this? + for(i = 0; i < 40; i++) { ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); } - + // Convert from last byte pos to length - ToSendMax++; + ++ToSendMax; } - /* Receive & handle a bit coming from the reader. * * This function is called 4 times per bit (every 2 subcarrier cycles). @@ -212,8 +310,7 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) * Returns: true if we received a EOF * false if we are still waiting for some more */ -static RAMFUNC int Handle14443bUartBit(uint8_t bit) -{ +static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { switch(Uart.state) { case STATE_UNSYNCD: if(!bit) { @@ -335,33 +432,33 @@ static RAMFUNC int Handle14443bUartBit(uint8_t bit) // Assume that we're called with the SSC (to the FPGA) and ADC path set // correctly. //----------------------------------------------------------------------------- -static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) -{ +static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) { // Set FPGA mode to "simulated ISO 14443B tag", no modulation (listen // only, since we are receiving, not transmitting). // Signal field is off with the appropriate LED LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); - + + StartCountSspClk(); + // Now run a `software UART' on the stream of incoming samples. UartInit(received); - + uint8_t b = 0; for(;;) { WDT_HIT(); if(BUTTON_PRESS()) return FALSE; if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; for(uint8_t mask = 0x80; mask != 0x00; mask >>= 1) { - if(Handle14443bUartBit(b & mask)) { + if(Handle14443bReaderUartBit(b & mask)) { *len = Uart.byteCnt; return TRUE; } } } - } - + } return FALSE; } @@ -369,16 +466,15 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) // Main loop of simulated tag: receive commands from reader, decide what // response to send, and send it. //----------------------------------------------------------------------------- -void SimulateIso14443bTag(void) -{ +void SimulateIso14443bTag(void) { // the only commands we understand is WUPB, AFI=0, Select All, N=1: - static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB + static const uint8_t cmd1[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 }; // WUPB // ... and REQB, AFI=0, Normal Request, N=1: - static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB + static const uint8_t cmd2[] = { ISO14443B_REQB, 0x00, 0x00, 0x71, 0xFF }; // REQB // ... and HLTB - static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB + static const uint8_t cmd3[] = { ISO14443B_HALT, 0xff, 0xff, 0xff, 0xff }; // HLTB // ... and ATTRIB - static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB + static const uint8_t cmd4[] = { ISO14443B_ATTRIB, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB // ... and we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922, // supports only 106kBit/s in both directions, max frame size = 32Bytes, @@ -389,42 +485,43 @@ void SimulateIso14443bTag(void) }; // response to HLTB and ATTRIB static const uint8_t response2[] = {0x00, 0x78, 0xF0}; - - //uint8_t parity[MAX_PARITY_SIZE] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - clear_trace(); + // allocate command receive buffer + BigBuf_free(); + BigBuf_Clear_ext(false); + clear_trace(); //sim set_tracing(TRUE); const uint8_t *resp; uint8_t *respCode; - uint16_t respLen, respCodeLen; - - // allocate command receive buffer - BigBuf_free(); BigBuf_Clear_ext(false); - + uint16_t respLen, respCodeLen, len, cmdsRecvd = 0; uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); - - uint16_t len; - uint16_t cmdsRecvd = 0; - + // prepare the (only one) tag answer: CodeIso14443bAsTag(response1, sizeof(response1)); uint8_t *resp1Code = BigBuf_malloc(ToSendMax); memcpy(resp1Code, ToSend, ToSendMax); uint16_t resp1CodeLen = ToSendMax; - + PrintToSendBuffer(); + DbpString("Printing Resp1Code:"); + Dbhexdump(resp1CodeLen, resp1Code, 0); + // prepare the (other) tag answer: CodeIso14443bAsTag(response2, sizeof(response2)); uint8_t *resp2Code = BigBuf_malloc(ToSendMax); memcpy(resp2Code, ToSend, ToSendMax); uint16_t resp2CodeLen = ToSendMax; - + PrintToSendBuffer(); + // We need to listen to the high-frequency, peak-detected path. SetAdcMuxFor(GPIO_MUXSEL_HIPKD); FpgaSetupSsc(); + uint32_t time_0 =0; + uint32_t t2r_time =0; + uint32_t r2t_time =0; cmdsRecvd = 0; for(;;) { @@ -433,10 +530,10 @@ void SimulateIso14443bTag(void) Dbprintf("button pressed, received %d commands", cmdsRecvd); break; } + r2t_time = GetCountSspClk(); - if (tracing) - //LogTrace(receivedCmd, len, 0, 0, parity, TRUE); - LogTrace(receivedCmd, len, 0, 0, NULL, TRUE); + if (tracing) + LogTrace(receivedCmd, len, (r2t_time - time_0), (r2t_time - time_0), NULL, TRUE); // Good, look at the command now. @@ -454,17 +551,15 @@ void SimulateIso14443bTag(void) respCodeLen = resp2CodeLen; } else { Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd); + // And print whether the CRC fails, just for good measure uint8_t b1, b2; if (len >= 3){ // if crc exists ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2); - if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) { - // Not so good, try again. + if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) DbpString("+++CRC fail"); - - } else { + else DbpString("CRC passes"); - } } //get rid of compiler warning respCodeLen = 0; @@ -475,10 +570,10 @@ void SimulateIso14443bTag(void) //break; } - cmdsRecvd++; + ++cmdsRecvd; - if(cmdsRecvd > 0x30) { - DbpString("many commands later..."); + if(cmdsRecvd > 1000) { + DbpString("1000 commands later..."); break; } @@ -488,33 +583,36 @@ void SimulateIso14443bTag(void) // Signal field is off with the appropriate LED LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK); + AT91C_BASE_SSC->SSC_THR = 0xff; + FpgaSetupSsc(); // Transmit the response. uint16_t i = 0; + volatile uint8_t b; for(;;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - uint8_t b = respCode[i]; - - AT91C_BASE_SSC->SSC_THR = b; + AT91C_BASE_SSC->SSC_THR = respCode[i]; i++; - if(i > respCodeLen) { + if(i > respCodeLen) break; - } } + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; (void)b; } } - // trace the response: + t2r_time = GetCountSspClk(); + if (tracing) - //LogTrace(resp, respLen, 0, 0, parity, FALSE); - LogTrace(resp, respLen, 0, 0, NULL, FALSE); + LogTrace(resp, respLen, (t2r_time-time_0), (t2r_time-time_0), NULL, FALSE); } + + switch_off(); //simulate } //============================================================================= @@ -539,12 +637,11 @@ void SimulateIso14443bTag(void) * */ #ifndef SUBCARRIER_DETECT_THRESHOLD -# define SUBCARRIER_DETECT_THRESHOLD 6 +# define SUBCARRIER_DETECT_THRESHOLD 8 #endif -static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) -{ - int v = 0; +static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { + int v=0;// , myI, myQ = 0; // The soft decision on the bit uses an estimate of just the // quadrant of the reference angle, not the exact angle. #define MAKE_SOFT_DECISION() { \ @@ -561,16 +658,6 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) } // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq) -/* #define CHECK_FOR_SUBCARRIER() { \ - v = ci; \ - if(v < 0) v = -v; \ - if(cq > 0) { \ - v += cq; \ - } else { \ - v -= cq; \ - } \ - } - */ // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq))) #define CHECK_FOR_SUBCARRIER() { \ if(ci < 0) { \ @@ -604,6 +691,12 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) } \ } +//note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow +#define CHECK_FOR_SUBCARRIER_un() { \ + myI = ABS(ci); \ + myQ = ABS(cq); \ + v = MAX(myI,myQ) + (MIN(myI,myQ) >> 1); \ + } switch(Demod.state) { case DEMOD_UNSYNCD: @@ -643,7 +736,6 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) MAKE_SOFT_DECISION(); - //Dbprintf("ICE: %d %d %d %d %d", v, Demod.sumI, Demod.sumQ, ci, cq ); if(v < 0) { // logic '0' detected Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF; Demod.posCount = 0; // start of SOF sequence @@ -665,6 +757,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.state = DEMOD_UNSYNCD; } else { LED_C_ON(); // Got SOF + Demod.startTime = GetCountSspClk(); Demod.state = DEMOD_AWAITING_START_BIT; Demod.posCount = 0; Demod.len = 0; @@ -727,6 +820,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.state = DEMOD_AWAITING_START_BIT; } else { Demod.state = DEMOD_UNSYNCD; + Demod.endTime = GetCountSspClk(); LED_C_OFF(); // This is EOF (start, stop and all data bits == '0' @@ -750,184 +844,185 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) * Demodulate the samples we received from the tag, also log to tracebuffer * quiet: set to 'TRUE' to disable debug output */ -static void GetSamplesFor14443bDemod(int n, bool quiet) -{ - int max = 0; +static void GetTagSamplesFor14443bDemod(bool quiet) { bool gotFrame = FALSE; - int lastRxCounter, ci, cq, samples = 0; + int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + int max = 0, ci = 0, cq = 0, samples = 0; + uint32_t time_0 = 0, time_stop = 0; - // Allocate memory from BigBuf for some buffers - // free all previous allocations first BigBuf_free(); - - // The response (tag -> reader) that we're receiving. + // Set up the demodulator for tag -> reader responses. DemodInit(BigBuf_malloc(MAX_FRAME_SIZE)); // The DMA buffer, used to stream samples from the FPGA int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); - - // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); + int8_t *upTo = dmaBuf; // Setup and start DMA. - FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); + if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE) ){ + if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); + return; + } - int8_t *upTo = dmaBuf; - lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + time_0 = GetCountSspClk(); + + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); + + while( !BUTTON_PRESS() ) { + WDT_HIT(); - // Signal field is ON with the appropriate LED: - LED_D_ON(); - for(;;) { int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; if(behindBy > max) max = behindBy; - while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) { + // rx counter - dma counter? (how much?) & (mod) dma buff / 2. (since 2bytes at the time is read) + while(((lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) { + ci = upTo[0]; cq = upTo[1]; upTo += 2; + samples += 2; + + // restart DMA buffer to receive again. if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { upTo = dmaBuf; AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE; } + lastRxCounter -= 2; - if(lastRxCounter <= 0) lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; - samples += 2; - - // - gotFrame = Handle14443bSamplesDemod(ci , cq ); - if ( gotFrame ) - break; + // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103 + //gotFrame = Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe); + gotFrame = Handle14443bTagSamplesDemod(ci, cq); + if ( gotFrame ) break; + LED_A_INV(); } - if(samples > n || gotFrame) { - break; - } + time_stop = GetCountSspClk() - time_0; + + if(time_stop > iso14b_timeout || gotFrame) break; } - - //disable - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; + + FpgaDisableSscDma(); if (!quiet) { - Dbprintf("max behindby = %d, samples = %d, gotFrame = %s, Demod.state = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", + Dbprintf("max behindby = %d, samples = %d, gotFrame = %s, Demod.state = %d, Demod.len = %u", max, samples, (gotFrame) ? "true" : "false", Demod.state, - Demod.len, - Demod.sumI, - Demod.sumQ + Demod.len ); } - - //Tracing - if (Demod.len > 0) - LogTrace(Demod.output, Demod.len, 0, 0, NULL, FALSE); + if ( Demod.len > 0 ) + LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE); + + // free mem refs. + // if ( dmaBuf ) dmaBuf = NULL; + // if ( upTo ) upTo = NULL; } //----------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. //----------------------------------------------------------------------------- -static void TransmitFor14443b(void) -{ - int c; - volatile uint32_t r; - FpgaSetupSsc(); - - while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) - AT91C_BASE_SSC->SSC_THR = 0xff; +static void TransmitFor14443b_AsReader(void) { - // Signal field is ON with the appropriate Red LED - LED_D_ON(); - // Signal we are transmitting with the Green LED - LED_B_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); + SpinDelay(20); - for(c = 0; c < 10;) { + int c; + // we could been in following mode: + // FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ + // if its second call or more + + // What does this loop do? Is it TR1? + for(c = 0; c < 10;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0xff; + AT91C_BASE_SSC->SSC_THR = 0xFF; ++c; } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); } - - c = 0; - for(;;) { + + // Send frame loop + for(c = 0; c < ToSendMax;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = ToSend[c]; ++c; - if(c >= ToSendMax) - break; } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); } - LED_B_OFF(); // Finished sending + WDT_HIT(); } - //----------------------------------------------------------------------------- // Code a layer 2 command (string of octets, including CRC) into ToSend[], // so that it is ready to transmit to the tag using TransmitFor14443b(). //----------------------------------------------------------------------------- static void CodeIso14443bAsReader(const uint8_t *cmd, int len) { - int i, j; + /* + * Reader data transmission: + * - no modulation ONES + * - SOF + * - Command, data and CRC_B + * - EOF + * - no modulation ONES + * + * 1 ETU == 1 BIT! + * TR0 - 8 ETUS minimum. + */ + int i; uint8_t b; - + ToSendReset(); - // Establish initial reference level - for(i = 0; i < 40; i++) - ToSendStuffBit(1); - // Send SOF - for(i = 0; i < 10; i++) + // 10-11 ETUs of ZERO + for(i = 0; i < 10; ++i) ToSendStuffBit(0); + + // 2-3 ETUs of ONE + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(1); + + // Sending cmd, LSB + // from here we add BITS + for(i = 0; i < len; ++i) { + // Start bit ToSendStuffBit(0); - - for(i = 0; i < len; i++) { - // Stop bits/EGT + // Data bits + b = cmd[i]; + if ( b & 1 ) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>1) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>2) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>3) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>4) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>5) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>6) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + if ( (b>>7) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // Stop bit ToSendStuffBit(1); + // EGT extra guard time + // For PCD it ranges 0-57us (1etu = 9us) ToSendStuffBit(1); - // Start bit - ToSendStuffBit(0); - // Data bits - b = cmd[i]; - for(j = 0; j < 8; j++) { - if(b & 1) - ToSendStuffBit(1); - else - ToSendStuffBit(0); - - b >>= 1; - } - } - // Send EOF - ToSendStuffBit(1); - for(i = 0; i < 10; i++) - ToSendStuffBit(0); - - for(i = 0; i < 8; i++) ToSendStuffBit(1); - - - // And then a little more, to make sure that the last character makes - // it out before we switch to rx mode. - for(i = 0; i < 24; i++) ToSendStuffBit(1); + } + + // Send EOF + // 10-11 ETUs of ZERO + for(i = 0; i < 10; ++i) ToSendStuffBit(0); + // Transition time. TR0 - guard time + // 8ETUS minum? + // Per specification, Subcarrier must be stopped no later than 2 ETUs after EOF. + for(i = 0; i < 40 ; ++i) ToSendStuffBit(1); + + // TR1 - Synchronization time // Convert from last character reference to length ++ToSendMax; } @@ -936,22 +1031,25 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) /** Convenience function to encode, transmit and trace iso 14443b comms **/ -static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) -{ +static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) { + CodeIso14443bAsReader(cmd, len); - TransmitFor14443b(); - if (tracing) { - //uint8_t parity[MAX_PARITY_SIZE]; - //LogTrace(cmd,len, 0, 0, parity, TRUE); - LogTrace(cmd,len, 0, 0, NULL, TRUE); - } + + uint32_t time_start = GetCountSspClk(); + + TransmitFor14443b_AsReader(); + + if(trigger) LED_A_ON(); + + if (tracing) LogTrace(cmd, len, time_start, GetCountSspClk()-time_start, NULL, TRUE); } /* Sends an APDU to the tag * TODO: check CRC and preamble */ -int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) +uint8_t iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) { + uint8_t crc[2] = {0x00, 0x00}; uint8_t message_frame[message_length + 4]; // PCB message_frame[0] = 0x0A | pcb_blocknum; @@ -963,13 +1061,17 @@ int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *respo // EDC (CRC) ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]); // send - CodeAndTransmit14443bAsReader(message_frame, message_length + 4); + CodeAndTransmit14443bAsReader(message_frame, message_length + 4); //no // get response - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetTagSamplesFor14443bDemod(TRUE); //no if(Demod.len < 3) return 0; - // TODO: Check CRC + // VALIDATE CRC + ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]); + if ( crc[0] != Demod.output[Demod.len-2] || crc[1] != Demod.output[Demod.len-1] ) + return 0; + // copy response contents if(response != NULL) memcpy(response, Demod.output, Demod.len); @@ -977,67 +1079,155 @@ int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *respo return Demod.len; } +/** +* SRx Initialise. +*/ +uint8_t iso14443b_select_srx_card(iso14b_card_select_t *card ) +{ + // INITIATE command: wake up the tag using the INITIATE + static const uint8_t init_srx[] = { ISO14443B_INITIATE, 0x00, 0x97, 0x5b }; + // SELECT command (with space for CRC) + uint8_t select_srx[] = { ISO14443B_SELECT, 0x00, 0x00, 0x00}; + // temp to calc crc. + uint8_t crc[2] = {0x00, 0x00}; + + CodeAndTransmit14443bAsReader(init_srx, sizeof(init_srx)); + GetTagSamplesFor14443bDemod(TRUE); //no + + if (Demod.len == 0) return 2; + + // Randomly generated Chip ID + if (card) card->chipid = Demod.output[0]; + + select_srx[1] = Demod.output[0]; + + ComputeCrc14443(CRC_14443_B, select_srx, 2, &select_srx[2], &select_srx[3]); + CodeAndTransmit14443bAsReader(select_srx, sizeof(select_srx)); + GetTagSamplesFor14443bDemod(TRUE); //no + + if (Demod.len != 3) return 2; + + // Check the CRC of the answer: + ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2 , &crc[0], &crc[1]); + if(crc[0] != Demod.output[1] || crc[1] != Demod.output[2]) return 3; + + // Check response from the tag: should be the same UID as the command we just sent: + if (select_srx[1] != Demod.output[0]) return 1; + + // First get the tag's UID: + select_srx[0] = ISO14443B_GET_UID; + + ComputeCrc14443(CRC_14443_B, select_srx, 1 , &select_srx[1], &select_srx[2]); + CodeAndTransmit14443bAsReader(select_srx, 3); // Only first three bytes for this one + GetTagSamplesFor14443bDemod(TRUE); //no + + if (Demod.len != 10) return 2; + + // The check the CRC of the answer + ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]); + if(crc[0] != Demod.output[8] || crc[1] != Demod.output[9]) return 3; + + if (card) { + card->uidlen = 8; + memcpy(card->uid, Demod.output, 8); + } + + return 0; +} /* Perform the ISO 14443 B Card Selection procedure * Currently does NOT do any collision handling. * It expects 0-1 cards in the device's range. * TODO: Support multiple cards (perform anticollision) * TODO: Verify CRC checksums */ -int iso14443b_select_card() +uint8_t iso14443b_select_card(iso14b_card_select_t *card ) { // WUPB command (including CRC) // Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state - static const uint8_t wupb[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + static const uint8_t wupb[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 }; // ATTRIB command (with space for CRC) - uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00}; + uint8_t attrib[] = { ISO14443B_ATTRIB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00}; + // temp to calc crc. + uint8_t crc[2] = {0x00, 0x00}; + // first, wake up the tag CodeAndTransmit14443bAsReader(wupb, sizeof(wupb)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetTagSamplesFor14443bDemod(TRUE); //select_card + // ATQB too short? - if (Demod.len < 14) - return 2; + if (Demod.len < 14) return 2; + + // VALIDATE CRC + ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]); + if ( crc[0] != Demod.output[12] || crc[1] != Demod.output[13] ) + return 3; + + if (card) { + card->uidlen = 4; + memcpy(card->uid, Demod.output+1, 4); + memcpy(card->atqb, Demod.output+5, 7); + } - // select the tag - // copy the PUPI to ATTRIB + // copy the PUPI to ATTRIB ( PUPI == UID ) memcpy(attrib + 1, Demod.output + 1, 4); - /* copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into - ATTRIB (Param 3) */ + + // copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into ATTRIB (Param 3) attrib[7] = Demod.output[10] & 0x0F; ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10); + CodeAndTransmit14443bAsReader(attrib, sizeof(attrib)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetTagSamplesFor14443bDemod(TRUE);//select_card + // Answer to ATTRIB too short? - if(Demod.len < 3) - return 2; + if(Demod.len < 3) return 2; + + // VALIDATE CRC + ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]); + if ( crc[0] != Demod.output[1] || crc[1] != Demod.output[2] ) + return 3; + // CID + if (card) card->cid = Demod.output[0]; + + uint8_t fwt = card->atqb[6]>>4; + if ( fwt < 16 ){ + uint32_t fwt_time = (302 << fwt); + iso14b_set_timeout( fwt_time); + } // reset PCB block number pcb_blocknum = 0; - return 1; + return 0; } // Set up ISO 14443 Type B communication (similar to iso14443a_setup) +// field is setup for "Sending as Reader" void iso14443b_setup() { - + if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup Enter"); + LEDsoff(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - - BigBuf_free(); BigBuf_Clear_ext(false); - DemodReset(); - UartReset(); + //BigBuf_free(); + //BigBuf_Clear_ext(false); - // Set up the synchronous serial port - FpgaSetupSsc(); + // Initialize Demod and Uart structs + DemodInit(BigBuf_malloc(MAX_FRAME_SIZE)); + UartInit(BigBuf_malloc(MAX_FRAME_SIZE)); // connect Demodulated Signal to ADC: SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + // Set up the synchronous serial port + FpgaSetupSsc(); + // Signal field is on with the appropriate LED - LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); - SpinDelay(200); + SpinDelay(100); // Start the timer StartCountSspClk(); + + LED_D_ON(); + if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup Exit"); } //----------------------------------------------------------------------------- @@ -1049,19 +1239,17 @@ void iso14443b_setup() { // // I tried to be systematic and check every answer of the tag, every CRC, etc... //----------------------------------------------------------------------------- -void ReadSTMemoryIso14443b(uint32_t dwLast) +void ReadSTMemoryIso14443b(uint8_t numofblocks) { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - clear_trace(); - set_tracing(TRUE); - - uint8_t i = 0x00; // Make sure that we start from off, since the tags are stateful; // confusing things will happen if we don't reset them between reads. - LED_D_OFF(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + switch_off(); // before ReadStMemory + + set_tracing(TRUE); + + uint8_t i = 0x00; SetAdcMuxFor(GPIO_MUXSEL_HIPKD); FpgaSetupSsc(); @@ -1070,12 +1258,12 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); - SpinDelay(200); + SpinDelay(20); // First command: wake up the tag using the INITIATE command - uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b}; - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + uint8_t cmd1[] = {ISO14443B_INITIATE, 0x00, 0x97, 0x5b}; + CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no + GetTagSamplesFor14443bDemod(TRUE); // no if (Demod.len == 0) { DbpString("No response from tag"); @@ -1088,11 +1276,11 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) // There is a response, SELECT the uid DbpString("Now SELECT tag:"); - cmd1[0] = 0x0E; // 0x0E is SELECT + cmd1[0] = ISO14443B_SELECT; // 0x0E is SELECT cmd1[1] = Demod.output[0]; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no + GetTagSamplesFor14443bDemod(TRUE); //no if (Demod.len != 3) { Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); set_tracing(FALSE); @@ -1114,10 +1302,10 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) // Tag is now selected, // First get the tag's UID: - cmd1[0] = 0x0B; + cmd1[0] = ISO14443B_GET_UID; ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]); - CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + CodeAndTransmit14443bAsReader(cmd1, 3); // no -- Only first three bytes for this one + GetTagSamplesFor14443bDemod(TRUE); //no if (Demod.len != 10) { Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); set_tracing(FALSE); @@ -1135,22 +1323,24 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]); // Now loop to read all 16 blocks, address from 0 to last block - Dbprintf("Tag memory dump, block 0 to %d", dwLast); + Dbprintf("Tag memory dump, block 0 to %d", numofblocks); cmd1[0] = 0x08; i = 0x00; - dwLast++; + ++numofblocks; + for (;;) { - if (i == dwLast) { + if (i == numofblocks) { DbpString("System area block (0xff):"); i = 0xff; } cmd1[1] = i; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no + GetTagSamplesFor14443bDemod(TRUE); //no + if (Demod.len != 6) { // Check if we got an answer from the tag - DbpString("Expected 6 bytes from tag, got less..."); - return; + DbpString("Expected 6 bytes from tag, got less..."); + return; } // The check the CRC of the answer (use cmd1 as temporary variable): ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]); @@ -1163,16 +1353,52 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) Dbprintf("Address=%02x, Contents=%08x, CRC=%04x", i, (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0], (Demod.output[4]<<8)+Demod.output[5]); - if (i == 0xff) { - break; - } - i++; + + if (i == 0xff) break; + ++i; } set_tracing(FALSE); } +static void iso1444b_setup_snoop(void){ + if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup_snoop Enter"); + LEDsoff(); + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + BigBuf_free(); + BigBuf_Clear_ext(false); + clear_trace();//setup snoop + set_tracing(TRUE); + + // Initialize Demod and Uart structs + DemodInit(BigBuf_malloc(MAX_FRAME_SIZE)); + UartInit(BigBuf_malloc(MAX_FRAME_SIZE)); + + if (MF_DBGLEVEL > 1) { + // Print debug information about the buffer sizes + Dbprintf("Snooping buffers initialized:"); + Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); + Dbprintf(" Reader -> tag: %i bytes", MAX_FRAME_SIZE); + Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE); + Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE); + } + + // connect Demodulated Signal to ADC: + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // Setup for the DMA. + FpgaSetupSsc(); + + // Set FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | FPGA_HF_READER_RX_XCORR_SNOOP); + SpinDelay(20); + + // Start the SSP timer + StartCountSspClk(); + if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup_snoop Exit"); +} + //============================================================================= // Finally, the `sniffer' combines elements from both the reader and // simulated tag, to show both sides of the conversation. @@ -1190,78 +1416,64 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) * DMA Buffer - ISO14443B_DMA_BUFFER_SIZE * Demodulated samples received - all the rest */ -void RAMFUNC SnoopIso14443b(void) -{ +void RAMFUNC SnoopIso14443b(void) { + + uint32_t time_0 = 0, time_start = 0, time_stop = 0; + // We won't start recording the frames that we acquire until we trigger; // a good trigger condition to get started is probably when we see a // response from the tag. - int triggered = TRUE; // TODO: set and evaluate trigger condition - - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - BigBuf_free(); BigBuf_Clear_ext(false); - - clear_trace(); - set_tracing(TRUE); - - // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); - int lastRxCounter; - int8_t *upTo; + int triggered = TRUE; // TODO: set and evaluate trigger condition int ci, cq; int maxBehindBy = 0; - - // Count of samples received so far, so that we can include timing - // information in the trace buffer. - int samples = 0; - - DemodInit(BigBuf_malloc(MAX_FRAME_SIZE)); - UartInit(BigBuf_malloc(MAX_FRAME_SIZE)); - - // Print some debug information about the buffer sizes - Dbprintf("Snooping buffers initialized:"); - Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); - Dbprintf(" Reader -> tag: %i bytes", MAX_FRAME_SIZE); - Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE); - Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE); - - // Signal field is off, no reader signal, no tag signal - LEDsoff(); - - // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | FPGA_HF_READER_RX_XCORR_SNOOP); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - - // Setup for the DMA. - FpgaSetupSsc(); - upTo = dmaBuf; - lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; - FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - //uint8_t parity[MAX_PARITY_SIZE] = {0x00}; - + //int behindBy = 0; + int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + bool TagIsActive = FALSE; bool ReaderIsActive = FALSE; + + iso1444b_setup_snoop(); + + // The DMA buffer, used to stream samples from the FPGA + int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); + int8_t *upTo = dmaBuf; + + // Setup and start DMA. + if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE) ){ + if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); + BigBuf_free(); + return; + } + + time_0 = GetCountSspClk(); // And now we loop, receiving samples. for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (ISO14443B_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } - if(behindBy < 2) continue; + WDT_HIT(); + + int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1); + if ( behindBy > maxBehindBy ) + maxBehindBy = behindBy; + + if ( behindBy < 2 ) continue; + ci = upTo[0]; cq = upTo[1]; upTo += 2; + lastRxCounter -= 2; - if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { + + if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { upTo = dmaBuf; lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE; WDT_HIT(); - if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not? + + // TODO: understand whether we can increase/decrease as we want or not? + if ( behindBy > ( 9 * ISO14443B_DMA_BUFFER_SIZE/10) ) { Dbprintf("blew circular buffer! behindBy=%d", behindBy); break; } @@ -1270,113 +1482,171 @@ void RAMFUNC SnoopIso14443b(void) DbpString("Trace full"); break; } - + if(BUTTON_PRESS()) { DbpString("cancelled"); break; } } + + if (!TagIsActive) { + + LED_A_ON(); + + // no need to try decoding reader data if the tag is sending + if (Handle14443bReaderUartBit(ci & 0x01)) { - samples += 2; + time_stop = (GetCountSspClk()-time_0); + + if (triggered) + LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE); - if (!TagIsActive) { // no need to try decoding reader data if the tag is sending - if (Handle14443bUartBit(ci & 0x01)) { - if(triggered && tracing) { - //LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, TRUE); - } /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ /* false-triggered by the commands from the reader. */ DemodReset(); + } else { + time_start = (GetCountSspClk()-time_0); } - if (Handle14443bUartBit(cq & 0x01)) { - if(triggered && tracing) { - //LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, TRUE); - } + + if (Handle14443bReaderUartBit(cq & 0x01)) { + + time_stop = (GetCountSspClk()-time_0); + + if (triggered) + LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE); + /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ /* false-triggered by the commands from the reader. */ DemodReset(); - } + } else { + time_start = (GetCountSspClk()-time_0); + } ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF); + LED_A_OFF(); } - - if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time + + if(!ReaderIsActive) { + // no need to try decoding tag data if the reader is sending - and we cannot afford the time // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103 - if(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) { - - //Use samples as a time measurement - if(tracing) - //LogTrace(Demod.output, Demod.len, samples, samples, parity, FALSE); - LogTrace(Demod.output, Demod.len, samples, samples, NULL, FALSE); + if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) { + + time_stop = (GetCountSspClk()-time_0); + + LogTrace(Demod.output, Demod.len, time_start, time_stop, NULL, FALSE); triggered = TRUE; // And ready to receive another response. DemodReset(); + } else { + time_start = (GetCountSspClk()-time_0); } TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF); } } - FpgaDisableSscDma(); - LEDsoff(); + switch_off(); // Snoop - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; DbpString("Snoop statistics:"); Dbprintf(" Max behind by: %i", maxBehindBy); - Dbprintf(" Uart State: %x", Uart.state); - Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt); - Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax); + Dbprintf(" Uart State: %x ByteCount: %i ByteCountMax: %i", Uart.state, Uart.byteCnt, Uart.byteCntMax); Dbprintf(" Trace length: %i", BigBuf_get_traceLen()); - set_tracing(FALSE); + + // free mem refs. + if ( dmaBuf ) dmaBuf = NULL; + if ( upTo ) upTo = NULL; + // Uart.byteCntMax should be set with ATQB value.. } +void iso14b_set_trigger(bool enable) { + trigger = enable; +} /* * Send raw command to tag ISO14443B * @Input - * datalen len of buffer data - * recv bool when true wait for data from tag and send to client - * powerfield bool leave the field on when true - * data buffer with byte to send + * param flags enum ISO14B_COMMAND. (mifare.h) + * len len of buffer data + * data buffer with bytes to send * * @Output * none * */ -void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) +void SendRawCommand14443B_Ex(UsbCommand *c) { - // param ISO_ - // param ISO_CONNECT - // param ISO14A_NO_DISCONNECT - //if (param & ISO14A_NO_DISCONNECT) - // return; - iso14443b_setup(); - - if ( datalen == 0 && recv == 0 && powerfield == 0){ - - } else { - clear_trace(); - set_tracing(TRUE); - CodeAndTransmit14443bAsReader(data, datalen); + iso14b_command_t param = c->arg[0]; + size_t len = c->arg[1] & 0xffff; + uint8_t *cmd = c->d.asBytes; + uint8_t status = 0; + uint32_t sendlen = sizeof(iso14b_card_select_t); + uint8_t buf[USB_CMD_DATA_SIZE] = {0x00}; + + if (MF_DBGLEVEL > 3) Dbprintf("14b raw: param, %04x", param ); + + // turn on trigger (LED_A) + if ((param & ISO14B_REQUEST_TRIGGER) == ISO14B_REQUEST_TRIGGER) + iso14b_set_trigger(TRUE); + + if ((param & ISO14B_CONNECT) == ISO14B_CONNECT) { + // Make sure that we start from off, since the tags are stateful; + // confusing things will happen if we don't reset them between reads. + //switch_off(); // before connect in raw + iso14443b_setup(); } + + set_tracing(TRUE); - if (recv) { - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, FALSE); - uint16_t len = MIN(Demod.len, USB_CMD_DATA_SIZE); - cmd_send(CMD_ACK, len, 0, 0, Demod.output, len); + if ((param & ISO14B_SELECT_STD) == ISO14B_SELECT_STD) { + iso14b_card_select_t *card = (iso14b_card_select_t*)buf; + status = iso14443b_select_card(card); + cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen); + // 0: OK 2: attrib fail, 3:crc fail, + if ( status > 0 ) return; + } + + if ((param & ISO14B_SELECT_SR) == ISO14B_SELECT_SR) { + iso14b_card_select_t *card = (iso14b_card_select_t*)buf; + status = iso14443b_select_srx_card(card); + cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen); + // 0: OK 2: attrib fail, 3:crc fail, + if ( status > 0 ) return; + } + + if ((param & ISO14B_APDU) == ISO14B_APDU) { + status = iso14443b_apdu(cmd, len, buf); + cmd_send(CMD_ACK, status, status, 0, buf, status); } - if (!powerfield) { - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - FpgaDisableSscDma(); - set_tracing(FALSE); - LED_D_OFF(); + if ((param & ISO14B_RAW) == ISO14B_RAW) { + if((param & ISO14B_APPEND_CRC) == ISO14B_APPEND_CRC) { + AppendCrc14443b(cmd, len); + len += 2; + } + + CodeAndTransmit14443bAsReader(cmd, len); // raw + GetTagSamplesFor14443bDemod(TRUE); // raw + + sendlen = MIN(Demod.len, USB_CMD_DATA_SIZE); + status = (Demod.len > 0) ? 0 : 1; + cmd_send(CMD_ACK, status, sendlen, 0, Demod.output, sendlen); } -} - + + // turn off trigger (LED_A) + if ((param & ISO14B_REQUEST_TRIGGER) == ISO14B_REQUEST_TRIGGER) + iso14b_set_trigger(FALSE); + + // turn off antenna et al + // we don't send a HALT command. + if ((param & ISO14B_DISCONNECT) == ISO14B_DISCONNECT) { + if (MF_DBGLEVEL > 3) Dbprintf("disconnect"); + switch_off(); // disconnect raw + } else { + //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); + } + +} \ No newline at end of file