X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b10a759fefc33673745dd65a6b4ba11af7cf8025..33db73516dd983734e6aba24ff1e861b6af5c7e3:/armsrc/iso14443b.c diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index db7f7539..0b9962e1 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -13,13 +13,15 @@ #include "apps.h" #include "util.h" #include "string.h" - #include "iso14443crc.h" +#include "common.h" +#define RECEIVE_SAMPLES_TIMEOUT 600000 +#define ISO14443B_DMA_BUFFER_SIZE 256 + -#define RECEIVE_SAMPLES_TIMEOUT 200000 -#define ISO14443B_DMA_BUFFER_SIZE 512 +// PCB Block number for APDUs +static uint8_t pcb_blocknum = 0; -uint8_t PowerOn = TRUE; //============================================================================= // 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 @@ -267,6 +269,7 @@ static void UartReset() Uart.state = STATE_UNSYNCD; Uart.byteCnt = 0; Uart.bitCnt = 0; + Uart.posCnt = 0; memset(Uart.output, 0x00, MAX_FRAME_SIZE); } @@ -476,6 +479,7 @@ void SimulateIso14443bTag(void) if (tracing) LogTrace(resp, respLen, 0, 0, parity, FALSE); } FpgaDisableSscDma(); + set_tracing(FALSE); } //============================================================================= @@ -522,9 +526,14 @@ static struct { * false if we are still waiting for some more * */ + #define abs(x) ( ((x)<0) ? -(x) : (x) ) static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) { - int v; + int v = 0; + int ai = abs(ci); + int aq = abs(cq); + int halfci = (ai >> 1); + int halfcq = (aq >> 1); // The soft decision on the bit uses an estimate of just the // quadrant of the reference angle, not the exact angle. @@ -543,50 +552,12 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) #define SUBCARRIER_DETECT_THRESHOLD 8 -// 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) { \ - if(cq < 0) { /* ci < 0, cq < 0 */ \ - if (cq < ci) { \ - v = -cq - (ci >> 1); \ - } else { \ - v = -ci - (cq >> 1); \ - } \ - } else { /* ci < 0, cq >= 0 */ \ - if (cq < -ci) { \ - v = -ci + (cq >> 1); \ - } else { \ - v = cq - (ci >> 1); \ - } \ - } \ - } else { \ - if(cq < 0) { /* ci >= 0, cq < 0 */ \ - if (-cq < ci) { \ - v = ci - (cq >> 1); \ - } else { \ - v = -cq + (ci >> 1); \ - } \ - } else { /* ci >= 0, cq >= 0 */ \ - if (cq < ci) { \ - v = ci + (cq >> 1); \ - } else { \ - v = cq + (ci >> 1); \ - } \ - } \ - } \ - } - + v = MAX(ai, aq) + MIN(halfci, halfcq); \ +} + + switch(Demod.state) { case DEMOD_UNSYNCD: CHECK_FOR_SUBCARRIER(); @@ -599,7 +570,8 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) break; case DEMOD_PHASE_REF_TRAINING: - if(Demod.posCount < 10*2) { + if(Demod.posCount < 8) { + //if(Demod.posCount < 10*2) { CHECK_FOR_SUBCARRIER(); if (v > SUBCARRIER_DETECT_THRESHOLD) { // set the reference phase (will code a logic '1') by averaging over 32 1/fs. @@ -617,11 +589,11 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) case DEMOD_AWAITING_FALLING_EDGE_OF_SOF: MAKE_SOFT_DECISION(); - if(v < 0) { // logic '0' detected + //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 } else { - //if(Demod.posCount > 200/4) { // maximum length of TR1 = 200 1/fs if(Demod.posCount > 25*2) { // maximum length of TR1 = 200 1/fs Demod.state = DEMOD_UNSYNCD; } @@ -636,6 +608,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) if(Demod.posCount < 10*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges Demod.state = DEMOD_UNSYNCD; } else { + LED_C_ON(); // Got SOF Demod.state = DEMOD_AWAITING_START_BIT; Demod.posCount = 0; Demod.len = 0; @@ -693,7 +666,6 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.bitCount++; if(Demod.bitCount == 10) { - LED_C_ON(); uint16_t s = Demod.shiftReg; if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0' uint8_t b = (s >> 1); @@ -728,6 +700,11 @@ static void DemodReset() Demod.len = 0; Demod.state = DEMOD_UNSYNCD; Demod.posCount = 0; + Demod.sumI = 0; + Demod.sumQ = 0; + Demod.bitCount = 0; + Demod.thisBit = 0; + Demod.shiftReg = 0; memset(Demod.output, 0x00, MAX_FRAME_SIZE); } @@ -757,25 +734,20 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); // The response (tag -> reader) that we're receiving. - uint8_t *resp = BigBuf_malloc(MAX_FRAME_SIZE); - // Set up the demodulator for tag -> reader responses. - DemodInit(resp); + 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); - + // Setup and start DMA. + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); + int8_t *upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; // Signal field is ON with the appropriate LED: LED_D_ON(); - - // Setup and start DMA. - FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - - for(;;) { int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; if(behindBy > max) max = behindBy; @@ -791,16 +763,16 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) } lastRxCounter -= 2; if(lastRxCounter <= 0) { - lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; + lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; } samples += 2; - if(Handle14443bSamplesDemod(ci, cq)) { - gotFrame = TRUE; + // + gotFrame = Handle14443bSamplesDemod(ci , cq ); + if ( gotFrame ) break; } - } if(samples > n || gotFrame) { break; @@ -809,7 +781,7 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - if (!quiet) { + if (!quiet && Demod.len == 0) { Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", max, samples, @@ -836,7 +808,7 @@ static void TransmitFor14443b(void) int c; FpgaSetupSsc(); - + while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = 0xff; } @@ -846,8 +818,6 @@ static void TransmitFor14443b(void) // Signal we are transmitting with the Green LED LED_B_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); - if ( !PowerOn ) - SpinDelay(200); for(c = 0; c < 10;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { @@ -892,7 +862,7 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) ToSendReset(); // Establish initial reference level - for(i = 0; i < 80; i++) { + for(i = 0; i < 40; i++) { ToSendStuffBit(1); } // Send SOF @@ -950,6 +920,103 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) } } +/* 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 message_frame[message_length + 4]; + // PCB + message_frame[0] = 0x0A | pcb_blocknum; + pcb_blocknum ^= 1; + // CID + message_frame[1] = 0; + // INF + memcpy(message_frame + 2, message, message_length); + // 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); + // get response + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE); + if(Demod.len < 3) + { + return 0; + } + // TODO: Check CRC + // copy response contents + if(response != NULL) + { + memcpy(response, Demod.output, Demod.len); + } + return Demod.len; +} + +/* 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() +{ + // 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 }; + // ATTRIB command (with space for CRC) + uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00}; + + // first, wake up the tag + CodeAndTransmit14443bAsReader(wupb, sizeof(wupb)); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + // ATQB too short? + if (Demod.len < 14) + { + return 2; + } + + // select the tag + // copy the PUPI to ATTRIB + memcpy(attrib + 1, Demod.output + 1, 4); + /* 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); + // Answer to ATTRIB too short? + if(Demod.len < 3) + { + return 2; + } + // reset PCB block number + pcb_blocknum = 0; + return 1; +} + +// Set up ISO 14443 Type B communication (similar to iso14443a_setup) +void iso14443b_setup() { + + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + + BigBuf_free(); + // Set up the synchronous serial port + FpgaSetupSsc(); + // connect Demodulated Signal to ADC: + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // 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(100); + + // Start the timer + //StartCountSspClk(); + + DemodReset(); + UartReset(); +} //----------------------------------------------------------------------------- // Read a SRI512 ISO 14443B tag. @@ -992,6 +1059,7 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) if (Demod.len == 0) { DbpString("No response from tag"); + set_tracing(FALSE); return; } else { Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x", @@ -1007,17 +1075,20 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 3) { Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); + set_tracing(FALSE); return; } // Check the CRC of the answer: ComputeCrc14443(CRC_14443_B, Demod.output, 1 , &cmd1[2], &cmd1[3]); if(cmd1[2] != Demod.output[1] || cmd1[3] != Demod.output[2]) { DbpString("CRC Error reading select response."); + set_tracing(FALSE); return; } // Check response from the tag: should be the same UID as the command we just sent: if (cmd1[1] != Demod.output[0]) { Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]); + set_tracing(FALSE); return; } @@ -1029,6 +1100,7 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 10) { Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); + set_tracing(FALSE); return; } // The check the CRC of the answer (use cmd1 as temporary variable): @@ -1076,6 +1148,8 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) } i++; } + + set_tracing(FALSE); } @@ -1208,7 +1282,8 @@ void RAMFUNC SnoopIso14443b(void) } if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time - if(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) { + // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103 + if(Handle14443bSamplesDemod(ci & 0xfe, cq & 0xfe)) { //Use samples as a time measurement if(tracing) @@ -1223,11 +1298,12 @@ void RAMFUNC SnoopIso14443b(void) } TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF); } - } FpgaDisableSscDma(); LEDsoff(); + set_tracing(FALSE); + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; DbpString("Snoop statistics:"); Dbprintf(" Max behind by: %i", maxBehindBy); @@ -1252,16 +1328,11 @@ void RAMFUNC SnoopIso14443b(void) */ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - BigBuf_free(); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - if ( !PowerOn ){ - FpgaSetupSsc(); - } + iso14443b_setup(); if ( datalen == 0 && recv == 0 && powerfield == 0){ - clear_trace(); - } else { + + } else { set_tracing(TRUE); CodeAndTransmit14443bAsReader(data, datalen); } @@ -1275,8 +1346,8 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u if(!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); FpgaDisableSscDma(); + set_tracing(FALSE); LED_D_OFF(); - PowerOn = 0; } }