X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/146600578c1ab840c33321662ee91ce169bb9086..75e42ef5dfc6868e696cbc13ef373d97a3040ada:/armsrc/iso14443b.c?ds=inline diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 31634a83..22227e74 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -19,6 +19,9 @@ #define RECEIVE_SAMPLES_TIMEOUT 2000 #define ISO14443B_DMA_BUFFER_SIZE 256 +// PCB Block number for APDUs +static uint8_t pcb_blocknum = 0; + //============================================================================= // 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 @@ -311,7 +314,7 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) } } } - + return FALSE; } @@ -360,13 +363,13 @@ void SimulateIso14443bTag(void) // prepare the (only one) tag answer: CodeIso14443bAsTag(response1, sizeof(response1)); uint8_t *resp1Code = BigBuf_malloc(ToSendMax); - memcpy(resp1Code, ToSend, ToSendMax); + memcpy(resp1Code, ToSend, ToSendMax); uint16_t resp1CodeLen = ToSendMax; // prepare the (other) tag answer: CodeIso14443bAsTag(response2, sizeof(response2)); uint8_t *resp2Code = BigBuf_malloc(ToSendMax); - memcpy(resp2Code, ToSend, ToSendMax); + memcpy(resp2Code, ToSend, ToSendMax); uint16_t resp2CodeLen = ToSendMax; // We need to listen to the high-frequency, peak-detected path. @@ -390,15 +393,15 @@ void SimulateIso14443bTag(void) // Good, look at the command now. if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) || (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) ) { - resp = response1; + resp = response1; respLen = sizeof(response1); - respCode = resp1Code; + respCode = resp1Code; respCodeLen = resp1CodeLen; } else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0]) || (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) { - resp = response2; + resp = response2; respLen = sizeof(response2); - respCode = resp2Code; + respCode = resp2Code; respCodeLen = resp2CodeLen; } else { Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd); @@ -457,13 +460,13 @@ void SimulateIso14443bTag(void) (void)b; } } - + // trace the response: if (tracing) { uint8_t parity[MAX_PARITY_SIZE]; LogTrace(resp, respLen, 0, 0, parity, FALSE); } - + } } @@ -541,18 +544,23 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int 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))) + + //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() { \ + v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \ + } + /* if(ci < 0) { \ - if(cq < 0) { /* ci < 0, cq < 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 */ \ + } else { \ // ci < 0, cq >= 0 if (cq < -ci) { \ v = -ci + (cq >> 1); \ } else { \ @@ -560,13 +568,13 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) } \ } \ } else { \ - if(cq < 0) { /* ci >= 0, cq < 0 */ \ + if(cq < 0) { \ // ci >= 0, cq < 0 if (-cq < ci) { \ v = ci - (cq >> 1); \ } else { \ v = -cq + (ci >> 1); \ } \ - } else { /* ci >= 0, cq >= 0 */ \ + } else { \ // ci >= 0, cq >= 0 if (cq < ci) { \ v = ci + (cq >> 1); \ } else { \ @@ -575,7 +583,8 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) } \ } \ } - + */ + switch(Demod.state) { case DEMOD_UNSYNCD: CHECK_FOR_SUBCARRIER(); @@ -673,7 +682,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.metric -= Demod.thisBit; } (Demod.metricN)++; -*/ +*/ Demod.shiftReg >>= 1; if(Demod.thisBit > 0) { // logic '1' @@ -741,10 +750,10 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) // 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 int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); @@ -924,6 +933,98 @@ 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); + // 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); + + // Start the timer + StartCountSspClk(); + + DemodReset(); + UartReset(); +} //----------------------------------------------------------------------------- // Read a SRI512 ISO 14443B tag. @@ -1118,7 +1219,7 @@ void RAMFUNC SnoopIso14443b(void) bool TagIsActive = FALSE; bool ReaderIsActive = FALSE; - + // And now we loop, receiving samples. for(;;) { int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & @@ -1238,7 +1339,7 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u 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);