X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/01d5b635cfcdce26369860d4353eea8e2cf20539..67ac4bf75c6953cae546159acd3e887d757bd0c3:/armsrc/iso14443.c diff --git a/armsrc/iso14443.c b/armsrc/iso14443.c deleted file mode 100644 index c202e312..00000000 --- a/armsrc/iso14443.c +++ /dev/null @@ -1,1245 +0,0 @@ -//----------------------------------------------------------------------------- -// Jonathan Westhues, split Nov 2006 -// -// 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. -//----------------------------------------------------------------------------- -// Routines to support ISO 14443. This includes both the reader software and -// the `fake tag' modes. At the moment only the Type B modulation is -// supported. -//----------------------------------------------------------------------------- - -#include "proxmark3.h" -#include "apps.h" -#include "util.h" -#include "string.h" - -#include "iso14443crc.h" - -//static void GetSamplesFor14443(int weTx, int n); - -/*#define DEMOD_TRACE_SIZE 4096 -#define READER_TAG_BUFFER_SIZE 2048 -#define TAG_READER_BUFFER_SIZE 2048 -#define DEMOD_DMA_BUFFER_SIZE 1024 -*/ - -#define RECEIVE_SAMPLES_TIMEOUT 2000 - -//============================================================================= -// 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 -// frame (i.e., a group of bytes between SOF and EOF), we check the CRC. -// If it's good, then we can do something appropriate with it, and send -// a response. -//============================================================================= - -//----------------------------------------------------------------------------- -// 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; - - 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); - } - - // Send SOF. - for(i = 0; i < 10; i++) { - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - } - for(i = 0; i < 2; i++) { - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - } - - for(i = 0; i < len; i++) { - int j; - uint8_t b = cmd[i]; - - // Start bit - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - - // Data bits - for(j = 0; j < 8; j++) { - if(b & 1) { - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - } else { - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - } - b >>= 1; - } - - // Stop bit - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - } - - // Send SOF. - for(i = 0; i < 10; i++) { - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - } - for(i = 0; i < 10; i++) { - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - } - - // Convert from last byte pos to length - ToSendMax++; - - // Add a few more for slop - ToSendMax += 2; -} - -//----------------------------------------------------------------------------- -// The software UART that receives commands from the reader, and its state -// variables. -//----------------------------------------------------------------------------- -static struct { - enum { - STATE_UNSYNCD, - STATE_GOT_FALLING_EDGE_OF_SOF, - STATE_AWAITING_START_BIT, - STATE_RECEIVING_DATA, - STATE_ERROR_WAIT - } state; - uint16_t shiftReg; - int bitCnt; - int byteCnt; - int byteCntMax; - int posCnt; - uint8_t *output; -} Uart; - -/* Receive & handle a bit coming from the reader. - * - * LED handling: - * LED A -> ON once we have received the SOF and are expecting the rest. - * LED A -> OFF once we have received EOF or are in error state or unsynced - * - * Returns: true if we received a EOF - * false if we are still waiting for some more - */ -static int Handle14443UartBit(int bit) -{ - switch(Uart.state) { - case STATE_UNSYNCD: - LED_A_OFF(); - if(!bit) { - // we went low, so this could be the beginning - // of an SOF - Uart.state = STATE_GOT_FALLING_EDGE_OF_SOF; - Uart.posCnt = 0; - Uart.bitCnt = 0; - } - break; - - case STATE_GOT_FALLING_EDGE_OF_SOF: - Uart.posCnt++; - if(Uart.posCnt == 2) { - if(bit) { - if(Uart.bitCnt >= 10) { - // we've seen enough consecutive - // zeros that it's a valid SOF - Uart.posCnt = 0; - Uart.byteCnt = 0; - Uart.state = STATE_AWAITING_START_BIT; - LED_A_ON(); // Indicate we got a valid SOF - } else { - // didn't stay down long enough - // before going high, error - Uart.state = STATE_ERROR_WAIT; - } - } else { - // do nothing, keep waiting - } - Uart.bitCnt++; - } - if(Uart.posCnt >= 4) Uart.posCnt = 0; - if(Uart.bitCnt > 14) { - // Give up if we see too many zeros without - // a one, too. - Uart.state = STATE_ERROR_WAIT; - } - break; - - case STATE_AWAITING_START_BIT: - Uart.posCnt++; - if(bit) { - if(Uart.posCnt > 25) { - // stayed high for too long between - // characters, error - Uart.state = STATE_ERROR_WAIT; - } - } else { - // falling edge, this starts the data byte - Uart.posCnt = 0; - Uart.bitCnt = 0; - Uart.shiftReg = 0; - Uart.state = STATE_RECEIVING_DATA; - LED_A_ON(); // Indicate we're receiving - } - break; - - case STATE_RECEIVING_DATA: - Uart.posCnt++; - if(Uart.posCnt == 2) { - // time to sample a bit - Uart.shiftReg >>= 1; - if(bit) { - Uart.shiftReg |= 0x200; - } - Uart.bitCnt++; - } - if(Uart.posCnt >= 4) { - Uart.posCnt = 0; - } - if(Uart.bitCnt == 10) { - if((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001)) - { - // this is a data byte, with correct - // start and stop bits - Uart.output[Uart.byteCnt] = (Uart.shiftReg >> 1) & 0xff; - Uart.byteCnt++; - - if(Uart.byteCnt >= Uart.byteCntMax) { - // Buffer overflowed, give up - Uart.posCnt = 0; - Uart.state = STATE_ERROR_WAIT; - } else { - // so get the next byte now - Uart.posCnt = 0; - Uart.state = STATE_AWAITING_START_BIT; - } - } else if(Uart.shiftReg == 0x000) { - // this is an EOF byte - LED_A_OFF(); // Finished receiving - return TRUE; - } else { - // this is an error - Uart.posCnt = 0; - Uart.state = STATE_ERROR_WAIT; - } - } - break; - - case STATE_ERROR_WAIT: - // We're all screwed up, so wait a little while - // for whatever went wrong to finish, and then - // start over. - Uart.posCnt++; - if(Uart.posCnt > 10) { - Uart.state = STATE_UNSYNCD; - } - break; - - default: - Uart.state = STATE_UNSYNCD; - break; - } - - // This row make the error blew circular buffer in hf 14b snoop - //if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error - - return FALSE; -} - -//----------------------------------------------------------------------------- -// Receive a command (from the reader to us, where we are the simulated tag), -// and store it in the given buffer, up to the given maximum length. Keeps -// spinning, waiting for a well-framed command, until either we get one -// (returns TRUE) or someone presses the pushbutton on the board (FALSE). -// -// Assume that we're called with the SSC (to the FPGA) and ADC path set -// correctly. -//----------------------------------------------------------------------------- -static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen) -{ - uint8_t mask; - int i, bit; - - // Set FPGA mode to "simulated ISO 14443 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); - - - // Now run a `software UART' on the stream of incoming samples. - Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; - - for(;;) { - WDT_HIT(); - - if(BUTTON_PRESS()) return FALSE; - - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - - mask = 0x80; - for(i = 0; i < 8; i++, mask >>= 1) { - bit = (b & mask); - if(Handle14443UartBit(bit)) { - *len = Uart.byteCnt; - return TRUE; - } - } - } - } -} - -//----------------------------------------------------------------------------- -// Main loop of simulated tag: receive commands from reader, decide what -// response to send, and send it. -//----------------------------------------------------------------------------- -void SimulateIso14443Tag(void) -{ - static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; - static const uint8_t response1[] = { - 0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22, - 0x00, 0x21, 0x85, 0x5e, 0xd7 - }; - - uint8_t *resp; - int respLen; - - uint8_t *resp1 = BigBuf_get_addr() + 800; - int resp1Len; - - uint8_t *receivedCmd = BigBuf_get_addr(); - int len; - - int i; - - int cmdsRecvd = 0; - - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - memset(receivedCmd, 0x44, 400); - - CodeIso14443bAsTag(response1, sizeof(response1)); - memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; - - // We need to listen to the high-frequency, peak-detected path. - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - - cmdsRecvd = 0; - - for(;;) { - uint8_t b1, b2; - - if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) { - Dbprintf("button pressed, received %d commands", cmdsRecvd); - break; - } - - // Good, look at the command now. - - if(len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len)==0) { - resp = resp1; respLen = resp1Len; - } else { - Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd); - // And print whether the CRC fails, just for good measure - ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2); - if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) { - // Not so good, try again. - DbpString("+++CRC fail"); - } else { - DbpString("CRC passes"); - } - break; - } - - memset(receivedCmd, 0x44, 32); - - cmdsRecvd++; - - if(cmdsRecvd > 0x30) { - DbpString("many commands later..."); - break; - } - - if(respLen <= 0) continue; - - // Modulate BPSK - // 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. - i = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - uint8_t b = resp[i]; - - AT91C_BASE_SSC->SSC_THR = b; - - i++; - if(i > respLen) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - (void)b; - } - } - } -} - -//============================================================================= -// An ISO 14443 Type B reader. We take layer two commands, code them -// appropriately, and then send them to the tag. We then listen for the -// tag's response, which we leave in the buffer to be demodulated on the -// PC side. -//============================================================================= - -static struct { - enum { - DEMOD_UNSYNCD, - DEMOD_PHASE_REF_TRAINING, - DEMOD_AWAITING_FALLING_EDGE_OF_SOF, - DEMOD_GOT_FALLING_EDGE_OF_SOF, - DEMOD_AWAITING_START_BIT, - DEMOD_RECEIVING_DATA, - DEMOD_ERROR_WAIT - } state; - int bitCount; - int posCount; - int thisBit; - int metric; - int metricN; - uint16_t shiftReg; - uint8_t *output; - int len; - int sumI; - int sumQ; -} Demod; - -/* - * Handles reception of a bit from the tag - * - * LED handling: - * LED C -> ON once we have received the SOF and are expecting the rest. - * LED C -> OFF once we have received EOF or are unsynced - * - * Returns: true if we received a EOF - * false if we are still waiting for some more - * - */ -static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) -{ - int v; - - // 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() { \ - if(Demod.sumI > 0) { \ - v = ci; \ - } else { \ - v = -ci; \ - } \ - if(Demod.sumQ > 0) { \ - v += cq; \ - } else { \ - v -= cq; \ - } \ - } - - switch(Demod.state) { - case DEMOD_UNSYNCD: - v = ci; - if(v < 0) v = -v; - if(cq > 0) { - v += cq; - } else { - v -= cq; - } - if(v > 40) { - Demod.posCount = 0; - Demod.state = DEMOD_PHASE_REF_TRAINING; - Demod.sumI = 0; - Demod.sumQ = 0; - } - break; - - case DEMOD_PHASE_REF_TRAINING: - if(Demod.posCount < 8) { - Demod.sumI += ci; - Demod.sumQ += cq; - } else if(Demod.posCount > 100) { - // error, waited too long - Demod.state = DEMOD_UNSYNCD; - } else { - MAKE_SOFT_DECISION(); - if(v < 0) { - Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; - Demod.posCount = 0; - } - } - Demod.posCount++; - break; - - case DEMOD_AWAITING_FALLING_EDGE_OF_SOF: - MAKE_SOFT_DECISION(); - if(v < 0) { - Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF; - Demod.posCount = 0; - } else { - if(Demod.posCount > 100) { - Demod.state = DEMOD_UNSYNCD; - } - } - Demod.posCount++; - break; - - case DEMOD_GOT_FALLING_EDGE_OF_SOF: - MAKE_SOFT_DECISION(); - if(v > 0) { - if(Demod.posCount < 12) { - Demod.state = DEMOD_UNSYNCD; - } else { - LED_C_ON(); // Got SOF - Demod.state = DEMOD_AWAITING_START_BIT; - Demod.posCount = 0; - Demod.len = 0; - Demod.metricN = 0; - Demod.metric = 0; - } - } else { - if(Demod.posCount > 100) { - Demod.state = DEMOD_UNSYNCD; - } - } - Demod.posCount++; - break; - - case DEMOD_AWAITING_START_BIT: - MAKE_SOFT_DECISION(); - if(v > 0) { - if(Demod.posCount > 10) { - Demod.state = DEMOD_UNSYNCD; - } - } else { - Demod.bitCount = 0; - Demod.posCount = 1; - Demod.thisBit = v; - Demod.shiftReg = 0; - Demod.state = DEMOD_RECEIVING_DATA; - } - break; - - case DEMOD_RECEIVING_DATA: - MAKE_SOFT_DECISION(); - if(Demod.posCount == 0) { - Demod.thisBit = v; - Demod.posCount = 1; - } else { - Demod.thisBit += v; - - if(Demod.thisBit > 0) { - Demod.metric += Demod.thisBit; - } else { - Demod.metric -= Demod.thisBit; - } - (Demod.metricN)++; - - Demod.shiftReg >>= 1; - if(Demod.thisBit > 0) { - Demod.shiftReg |= 0x200; - } - - Demod.bitCount++; - if(Demod.bitCount == 10) { - uint16_t s = Demod.shiftReg; - if((s & 0x200) && !(s & 0x001)) { - uint8_t b = (s >> 1); - Demod.output[Demod.len] = b; - Demod.len++; - Demod.state = DEMOD_AWAITING_START_BIT; - } else if(s == 0x000) { - // This is EOF - LED_C_OFF(); - Demod.state = DEMOD_UNSYNCD; - return TRUE; - } else { - Demod.state = DEMOD_UNSYNCD; - } - } - Demod.posCount = 0; - } - break; - - default: - Demod.state = DEMOD_UNSYNCD; - break; - } - - if (Demod.state == DEMOD_UNSYNCD) LED_C_OFF(); // Not synchronized... - return FALSE; -} -static void DemodReset() -{ - // Clear out the state of the "UART" that receives from the tag. - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; - memset(Demod.output, 0x00, MAX_FRAME_SIZE); -} -static void DemodInit(uint8_t *data) -{ - Demod.output = data; - DemodReset(); -} - -static void UartReset() -{ - Uart.byteCntMax = MAX_FRAME_SIZE; - Uart.state = STATE_UNSYNCD; - Uart.byteCnt = 0; - Uart.bitCnt = 0; -} -static void UartInit(uint8_t *data) -{ - Uart.output = data; - UartReset(); -} - -/* - * Demodulate the samples we received from the tag, also log to tracebuffer - * weTx: set to 'TRUE' if we behave like a reader - * set to 'FALSE' if we behave like a snooper - * quiet: set to 'TRUE' to disable debug output - */ -static void GetSamplesFor14443Demod(int weTx, int n, int quiet) -{ - int max = 0; - int gotFrame = FALSE; - int lastRxCounter, ci, cq, samples = 0; - - // Allocate memory from BigBuf for some buffers - // free all previous allocations first - BigBuf_free(); - - // The response (tag -> reader) that we're receiving. - uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE); - - // The DMA buffer, used to stream samples from the FPGA - uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); - - // Set up the demodulator for tag -> reader responses. - DemodInit(receivedResponse); - - // Setup and start DMA. - FpgaSetupSscDma(dmaBuf, DMA_BUFFER_SIZE); - - uint8_t *upTo= dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; - - // Signal field is ON with the appropriate LED: - if (weTx) LED_D_ON(); else LED_D_OFF(); - // And put the FPGA in the appropriate mode - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | - (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP)); - - for(;;) { - int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; - if(behindBy > max) max = behindBy; - - while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DMA_BUFFER_SIZE-1)) - > 2) - { - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { - upTo = dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; - } - lastRxCounter -= 2; - if(lastRxCounter <= 0) { - lastRxCounter += DMA_BUFFER_SIZE; - } - - samples += 2; - - if(Handle14443SamplesDemod(ci, cq)) { - gotFrame = 1; - } - } - - if(samples > n) { - break; - } - } - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len); - //Tracing - if (tracing && Demod.len > 0) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); - LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE); - } -} - -//----------------------------------------------------------------------------- -// Read the tag's response. We just receive a stream of slightly-processed -// samples from the FPGA, which we will later do some signal processing on, -// to get the bits. -//----------------------------------------------------------------------------- -/*static void GetSamplesFor14443(int weTx, int n) -{ - uint8_t *dest = (uint8_t *)BigBuf; - int c; - - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | - (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP)); - - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - int8_t b; - b = (int8_t)AT91C_BASE_SSC->SSC_RHR; - - dest[c++] = (uint8_t)b; - - if(c >= n) { - break; - } - } - } -}*/ - -//----------------------------------------------------------------------------- -// Transmit the command (to the tag) that was placed in ToSend[]. -//----------------------------------------------------------------------------- -static void TransmitFor14443(void) -{ - int c; - - FpgaSetupSsc(); - - while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0xff; - } - - // 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); - - for(c = 0; c < 10;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0xff; - c++; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - - c = 0; - for(;;) { - 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)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - LED_B_OFF(); // Finished sending -} - -//----------------------------------------------------------------------------- -// Code a layer 2 command (string of octets, including CRC) into ToSend[], -// so that it is ready to transmit to the tag using TransmitFor14443(). -//----------------------------------------------------------------------------- -static void CodeIso14443bAsReader(const uint8_t *cmd, int len) -{ - int i, j; - uint8_t b; - - ToSendReset(); - - // Establish initial reference level - for(i = 0; i < 40; i++) { - ToSendStuffBit(1); - } - // Send SOF - for(i = 0; i < 10; i++) { - ToSendStuffBit(0); - } - - for(i = 0; i < len; i++) { - // Stop bits/EGT - ToSendStuffBit(1); - 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); - } - - // Convert from last character reference to length - ToSendMax++; -} - -//----------------------------------------------------------------------------- -// Read an ISO 14443 tag. We send it some set of commands, and record the -// responses. -// The command name is misleading, it actually decodes the reponse in HEX -// into the output buffer (read the result using hexsamples, not hisamples) -// -// obsolete function only for test -//----------------------------------------------------------------------------- -void AcquireRawAdcSamplesIso14443(uint32_t parameter) -{ - uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; - - SendRawCommand14443B(sizeof(cmd1),1,1,cmd1); -} - -/** - Convenience function to encode, transmit and trace iso 14443b comms - **/ -static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) -{ - CodeIso14443bAsReader(cmd, len); - TransmitFor14443(); - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(cmd, len, parity); - LogTrace(cmd,len, 0, 0, parity, TRUE); - } -} - -//----------------------------------------------------------------------------- -// Read a SRI512 ISO 14443 tag. -// -// SRI512 tags are just simple memory tags, here we're looking at making a dump -// of the contents of the memory. No anticollision algorithm is done, we assume -// we have a single tag in the field. -// -// I tried to be systematic and check every answer of the tag, every CRC, etc... -//----------------------------------------------------------------------------- -void ReadSTMemoryIso14443(uint32_t dwLast) -{ - clear_trace(); - set_tracing(TRUE); - - uint8_t i = 0x00; - - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // 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); - - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - - // Now give it time to spin up. - // 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); - - // First command: wake up the tag using the INITIATE command - uint8_t cmd1[] = { 0x06, 0x00, 0x97, 0x5b}; - - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); - - if (Demod.len == 0) { - DbpString("No response from tag"); - return; - } else { - Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %x %x %x", - Demod.output[0], Demod.output[1],Demod.output[2]); - } - // There is a response, SELECT the uid - DbpString("Now SELECT tag:"); - cmd1[0] = 0x0E; // 0x0E is SELECT - cmd1[1] = Demod.output[0]; - ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); - if (Demod.len != 3) { - Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); - 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."); - 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: %x %x", cmd1[1], Demod.output[0]); - return; - } - // Tag is now selected, - // First get the tag's UID: - cmd1[0] = 0x0B; - ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]); - CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); - if (Demod.len != 10) { - Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); - return; - } - // The check the CRC of the answer (use cmd1 as temporary variable): - ComputeCrc14443(CRC_14443_B, Demod.output, 8, &cmd1[2], &cmd1[3]); - if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) { - Dbprintf("CRC Error reading block! - Below: expected, got %x %x", - (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]); - // Do not return;, let's go on... (we should retry, maybe ?) - } - Dbprintf("Tag UID (64 bits): %08x %08x", - (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4], - (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); - cmd1[0] = 0x08; - i = 0x00; - dwLast++; - for (;;) { - if (i == dwLast) { - DbpString("System area block (0xff):"); - i = 0xff; - } - cmd1[1] = i; - ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); - CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); - if (Demod.len != 6) { // Check if we got an answer from the tag - 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]); - if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) { - Dbprintf("CRC Error reading block! - Below: expected, got %x %x", - (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]); - // Do not return;, let's go on... (we should retry, maybe ?) - } - // Now print out the memory location: - Dbprintf("Address=%x, Contents=%x, CRC=%x", 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++; - } -} - - -//============================================================================= -// Finally, the `sniffer' combines elements from both the reader and -// simulated tag, to show both sides of the conversation. -//============================================================================= - -//----------------------------------------------------------------------------- -// Record the sequence of commands sent by the reader to the tag, with -// triggering so that we start recording at the point that the tag is moved -// near the reader. -//----------------------------------------------------------------------------- -/* - * Memory usage for this function, (within BigBuf) - * 0-4095 : Demodulated samples receive (4096 bytes) - DEMOD_TRACE_SIZE - * 4096-6143 : Last Received command, 2048 bytes (reader->tag) - READER_TAG_BUFFER_SIZE - * 6144-8191 : Last Received command, 2048 bytes(tag->reader) - TAG_READER_BUFFER_SIZE - * 8192-9215 : DMA Buffer, 1024 bytes (samples) - DEMOD_DMA_BUFFER_SIZE - */ -void RAMFUNC SnoopIso14443(void) -{ - // 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; - - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - BigBuf_free(); - - clear_trace(); - set_tracing(TRUE); - - // The DMA buffer, used to stream samples from the FPGA - uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); - int lastRxCounter; - uint8_t *upTo; - 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", DMA_BUFFER_SIZE); - - // Signal field is off with the appropriate LED - LED_D_OFF(); - - // 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 = DMA_BUFFER_SIZE; - FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; - LED_A_ON(); - - // And now we loop, receiving samples. - for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - if(behindBy > (9*DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not? - Dbprintf("blew circular buffer! behindBy=0x%x", behindBy); - break; - } - } - if(behindBy < 2) continue; - - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - lastRxCounter -= 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { - upTo = dmaBuf; - lastRxCounter += DMA_BUFFER_SIZE; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; - } - - samples += 2; - - if(Handle14443UartBit(ci & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); - } - if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - - /* 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(); - } - if(Handle14443UartBit(cq & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); - } - if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - - /* 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(); - } - - if(Handle14443SamplesDemod(ci, cq)) { - - //Use samples as a time measurement - if(tracing) - { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); - LogTrace(Demod.output,Demod.len,samples, samples,parity,FALSE); - } - triggered = TRUE; - LED_A_OFF(); - LED_B_ON(); - - // And ready to receive another response. - DemodReset(); - } - WDT_HIT(); - - if(!tracing) { - DbpString("Reached trace limit"); - break; - } - - if(BUTTON_PRESS()) { - DbpString("cancelled"); - break; - } - } - FpgaDisableSscDma(); - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - 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(" Trace length: %i", BigBuf_get_traceLen()); -} - -/* - * 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 - * - * @Output - * none - * - */ - -void SendRawCommand14443B(uint32_t datalen, uint32_t recv,uint8_t powerfield, uint8_t data[]) -{ - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - if(!powerfield) - { - // Make sure that we start from off, since the tags are stateful; - // confusing things will happen if we don't reset them between reads. - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - SpinDelay(200); - } - - if(!GETBIT(GPIO_LED_D)) - { - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - - // Now give it time to spin up. - // 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); - } - - CodeAndTransmit14443bAsReader(data, datalen); - - if(recv) - { - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); - uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE); - cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen); - } - if(!powerfield) - { - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - } -} -