X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/1e262141523bcda8b170cc42fb5bd8d6bb8d17f1..4df3eb3f739af80b6fdc8f737fc906d254ebd0b5:/armsrc/iso14443a.c?ds=sidebyside diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 13a00aba..111d7139 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -1,5 +1,5 @@ //----------------------------------------------------------------------------- -// Merlok - June 2011 +// Merlok - June 2011, 2012 // Gerhard de Koning Gans - May 2008 // Hagen Fritsch - June 2010 // @@ -14,6 +14,7 @@ #include "apps.h" #include "util.h" #include "string.h" +#include "cmd.h" #include "iso14443crc.h" #include "iso14443a.h" @@ -21,11 +22,13 @@ #include "mifareutil.h" static uint32_t iso14a_timeout; -uint8_t *trace = (uint8_t *) BigBuf; +uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET; int traceLen = 0; int rsamples = 0; int tracing = TRUE; uint8_t trigger = 0; +// the block number for the ISO14443-4 PCB +static uint8_t iso14_pcb_blocknum = 0; // CARD TO READER - manchester // Sequence D: 11110000 modulation with subcarrier during first half @@ -62,17 +65,23 @@ const uint8_t OddByteParity[256] = { }; -void iso14a_set_trigger(int enable) { +void iso14a_set_trigger(bool enable) { trigger = enable; } -void iso14a_clear_tracelen(void) { +void iso14a_clear_trace() { + memset(trace, 0x44, TRACE_SIZE); traceLen = 0; } -void iso14a_set_tracing(int enable) { + +void iso14a_set_tracing(bool enable) { tracing = enable; } +void iso14a_set_timeout(uint32_t timeout) { + iso14a_timeout = timeout; +} + //----------------------------------------------------------------------------- // Generate the parity value for a byte sequence // @@ -101,10 +110,10 @@ void AppendCrc14443a(uint8_t* data, int len) } // The function LogTrace() is also used by the iClass implementation in iClass.c -int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader) +int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader) { // Return when trace is full - if (traceLen >= TRACE_LENGTH) return FALSE; + if (traceLen >= TRACE_SIZE) return FALSE; // Trace the random, i'm curious rsamples += iSamples; @@ -129,32 +138,7 @@ int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, // The software UART that receives commands from the reader, and its state // variables. //----------------------------------------------------------------------------- -static struct { - enum { - STATE_UNSYNCD, - STATE_START_OF_COMMUNICATION, - STATE_MILLER_X, - STATE_MILLER_Y, - STATE_MILLER_Z, - STATE_ERROR_WAIT - } state; - uint16_t shiftReg; - int bitCnt; - int byteCnt; - int byteCntMax; - int posCnt; - int syncBit; - int parityBits; - int samples; - int highCnt; - int bitBuffer; - enum { - DROP_NONE, - DROP_FIRST_HALF, - DROP_SECOND_HALF - } drop; - uint8_t *output; -} Uart; +static tUart Uart; static RAMFUNC int MillerDecoding(int bit) { @@ -393,32 +377,7 @@ static RAMFUNC int MillerDecoding(int bit) //============================================================================= // ISO 14443 Type A - Manchester //============================================================================= - -static struct { - enum { - DEMOD_UNSYNCD, - DEMOD_START_OF_COMMUNICATION, - DEMOD_MANCHESTER_D, - DEMOD_MANCHESTER_E, - DEMOD_MANCHESTER_F, - DEMOD_ERROR_WAIT - } state; - int bitCount; - int posCount; - int syncBit; - int parityBits; - uint16_t shiftReg; - int buffer; - int buff; - int samples; - int len; - enum { - SUB_NONE, - SUB_FIRST_HALF, - SUB_SECOND_HALF - } sub; - uint8_t *output; -} Demod; +static tDemod Demod; static RAMFUNC int ManchesterDecoding(int v) { @@ -618,166 +577,147 @@ static RAMFUNC int ManchesterDecoding(int v) // triggering so that we start recording at the point that the tag is moved // near the reader. //----------------------------------------------------------------------------- -void RAMFUNC SnoopIso14443a(void) -{ -// #define RECV_CMD_OFFSET 2032 // original (working as of 21/2/09) values -// #define RECV_RES_OFFSET 2096 // original (working as of 21/2/09) values -// #define DMA_BUFFER_OFFSET 2160 // original (working as of 21/2/09) values -// #define DMA_BUFFER_SIZE 4096 // original (working as of 21/2/09) values -// #define TRACE_LENGTH 2000 // original (working as of 21/2/09) values - - // 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 = FALSE; // FALSE to wait first for card - - // The command (reader -> tag) that we're receiving. +void RAMFUNC SnoopIso14443a(uint8_t param) { + // param: + // bit 0 - trigger from first card answer + // bit 1 - trigger from first reader 7-bit request + + LEDsoff(); + // init trace buffer + iso14a_clear_trace(); + + // 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. + // triggered == FALSE -- to wait first for card + int triggered = !(param & 0x03); + + // The command (reader -> tag) that we're receiving. // The length of a received command will in most cases be no more than 18 bytes. // So 32 should be enough! - uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); - // The response (tag -> reader) that we're receiving. - uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET); + uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); + // The response (tag -> reader) that we're receiving. + uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET); - // As we receive stuff, we copy it from receivedCmd or receivedResponse - // into trace, along with its length and other annotations. - //uint8_t *trace = (uint8_t *)BigBuf; - - traceLen = 0; // uncommented to fix ISSUE 15 - gerhard - jan2011 - - // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; - int lastRxCounter; - int8_t *upTo; - int smpl; - int maxBehindBy = 0; - - // Count of samples received so far, so that we can include timing - // information in the trace buffer. - int samples = 0; - int rsamples = 0; - - memset(trace, 0x44, RECV_CMD_OFFSET); - - // Set up the demodulator for tag -> reader responses. - Demod.output = receivedResponse; - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; - - // Setup for the DMA. - FpgaSetupSsc(); - upTo = dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; - FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); - - // And the reader -> tag commands - memset(&Uart, 0, sizeof(Uart)); - Uart.output = receivedCmd; - Uart.byteCntMax = 32; // was 100 (greg)//////////////////////////////////////////////////////////////////////// - Uart.state = STATE_UNSYNCD; + // As we receive stuff, we copy it from receivedCmd or receivedResponse + // into trace, along with its length and other annotations. + //uint8_t *trace = (uint8_t *)BigBuf; + + // The DMA buffer, used to stream samples from the FPGA + int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; + int8_t *data = dmaBuf; + int maxDataLen = 0; + int dataLen = 0; - // And put the FPGA in the appropriate mode - // Signal field is off with the appropriate LED - LED_D_OFF(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + // Set up the demodulator for tag -> reader responses. + Demod.output = receivedResponse; + Demod.len = 0; + Demod.state = DEMOD_UNSYNCD; + // Set up the demodulator for the reader -> tag commands + memset(&Uart, 0, sizeof(Uart)); + Uart.output = receivedCmd; + Uart.byteCntMax = 32; // was 100 (greg)////////////////// + Uart.state = STATE_UNSYNCD; - // And now we loop, receiving samples. - for(;;) { - LED_A_ON(); - WDT_HIT(); - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - if(behindBy > 400) { - Dbprintf("blew circular buffer! behindBy=0x%x", behindBy); - goto done; - } - } - if(behindBy < 1) continue; + // Setup for the DMA. + FpgaSetupSsc(); + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); - LED_A_OFF(); - smpl = upTo[0]; - upTo++; - lastRxCounter -= 1; - if(upTo - dmaBuf > DMA_BUFFER_SIZE) { - upTo -= DMA_BUFFER_SIZE; - lastRxCounter += DMA_BUFFER_SIZE; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; - } + // And put the FPGA in the appropriate mode + // Signal field is off with the appropriate LED + LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - samples += 4; - if(MillerDecoding((smpl & 0xF0) >> 4)) { - rsamples = samples - Uart.samples; - LED_C_ON(); - if(triggered) { - trace[traceLen++] = ((rsamples >> 0) & 0xff); - trace[traceLen++] = ((rsamples >> 8) & 0xff); - trace[traceLen++] = ((rsamples >> 16) & 0xff); - trace[traceLen++] = ((rsamples >> 24) & 0xff); - trace[traceLen++] = ((Uart.parityBits >> 0) & 0xff); - trace[traceLen++] = ((Uart.parityBits >> 8) & 0xff); - trace[traceLen++] = ((Uart.parityBits >> 16) & 0xff); - trace[traceLen++] = ((Uart.parityBits >> 24) & 0xff); - trace[traceLen++] = Uart.byteCnt; - memcpy(trace+traceLen, receivedCmd, Uart.byteCnt); - traceLen += Uart.byteCnt; - if(traceLen > TRACE_LENGTH) break; - } - /* And ready to receive another command. */ - Uart.state = STATE_UNSYNCD; - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - Demod.state = DEMOD_UNSYNCD; - LED_B_OFF(); - } + // Count of samples received so far, so that we can include timing + // information in the trace buffer. + rsamples = 0; + // And now we loop, receiving samples. + while(true) { + if(BUTTON_PRESS()) { + DbpString("cancelled by button"); + goto done; + } - if(ManchesterDecoding(smpl & 0x0F)) { - rsamples = samples - Demod.samples; - LED_B_ON(); - - // timestamp, as a count of samples - trace[traceLen++] = ((rsamples >> 0) & 0xff); - trace[traceLen++] = ((rsamples >> 8) & 0xff); - trace[traceLen++] = ((rsamples >> 16) & 0xff); - trace[traceLen++] = 0x80 | ((rsamples >> 24) & 0xff); - trace[traceLen++] = ((Demod.parityBits >> 0) & 0xff); - trace[traceLen++] = ((Demod.parityBits >> 8) & 0xff); - trace[traceLen++] = ((Demod.parityBits >> 16) & 0xff); - trace[traceLen++] = ((Demod.parityBits >> 24) & 0xff); - // length - trace[traceLen++] = Demod.len; - memcpy(trace+traceLen, receivedResponse, Demod.len); - traceLen += Demod.len; - if(traceLen > TRACE_LENGTH) break; - - triggered = TRUE; - - // And ready to receive another response. - memset(&Demod, 0, sizeof(Demod)); - Demod.output = receivedResponse; - Demod.state = DEMOD_UNSYNCD; - LED_C_OFF(); - } + LED_A_ON(); + WDT_HIT(); - if(BUTTON_PRESS()) { - DbpString("cancelled_a"); - goto done; - } - } + int register readBufDataP = data - dmaBuf; + int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; + if (readBufDataP <= dmaBufDataP){ + dataLen = dmaBufDataP - readBufDataP; + } else { + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1; + } + // test for length of buffer + if(dataLen > maxDataLen) { + maxDataLen = dataLen; + if(dataLen > 400) { + Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); + goto done; + } + } + if(dataLen < 1) continue; - DbpString("COMMAND FINISHED"); + // primary buffer was stopped( <-- we lost data! + if (!AT91C_BASE_PDC_SSC->PDC_RCR) { + AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; + AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; + } + // secondary buffer sets as primary, secondary buffer was stopped + if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; + AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; + } + + LED_A_OFF(); + + rsamples += 4; + if(MillerDecoding((data[0] & 0xF0) >> 4)) { + LED_C_ON(); + + // check - if there is a short 7bit request from reader + if ((!triggered) && (param & 0x02) && (Uart.byteCnt == 1) && (Uart.bitCnt = 9)) triggered = TRUE; + + if(triggered) { + if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break; + } + /* And ready to receive another command. */ + Uart.state = STATE_UNSYNCD; + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + Demod.state = DEMOD_UNSYNCD; + LED_B_OFF(); + } + + if(ManchesterDecoding(data[0] & 0x0F)) { + LED_B_ON(); + + if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break; + + if ((!triggered) && (param & 0x01)) triggered = TRUE; + + // And ready to receive another response. + memset(&Demod, 0, sizeof(Demod)); + Demod.output = receivedResponse; + Demod.state = DEMOD_UNSYNCD; + LED_C_OFF(); + } + + data++; + if(data > dmaBuf + DMA_BUFFER_SIZE) { + data = dmaBuf; + } + } // main cycle + + DbpString("COMMAND FINISHED"); done: - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - Dbprintf("maxBehindBy=%x, Uart.state=%x, Uart.byteCnt=%x", maxBehindBy, Uart.state, Uart.byteCnt); - Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%x", Uart.byteCntMax, traceLen, (int)Uart.output[0]); - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; + Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x", maxDataLen, Uart.state, Uart.byteCnt); + Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%08x", Uart.byteCntMax, traceLen, (int)Uart.output[0]); + LEDsoff(); } //----------------------------------------------------------------------------- @@ -958,51 +898,105 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen } } } + static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded); +int EmSend4bitEx(uint8_t resp, int correctionNeeded); +int EmSend4bit(uint8_t resp); +int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par); +int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par); +int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded); +int EmSendCmd(uint8_t *resp, int respLen); +int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par); //----------------------------------------------------------------------------- // Main loop of simulated tag: receive commands from reader, decide what // response to send, and send it. //----------------------------------------------------------------------------- -void SimulateIso14443aTag(int tagType, int TagUid) +void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) { - // This function contains the tag emulation - - // Prepare protocol messages - // static const uint8_t cmd1[] = { 0x26 }; -// static const uint8_t response1[] = { 0x02, 0x00 }; // Says: I am Mifare 4k - original line - greg -// - static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me -// static const uint8_t response1[] = { 0x44, 0x00 }; // Says: I am a ULTRALITE Tag, 0wn me - - // UID response - // static const uint8_t cmd2[] = { 0x93, 0x20 }; - //static const uint8_t response2[] = { 0x9a, 0xe5, 0xe4, 0x43, 0xd8 }; // original value - greg + // Enable and clear the trace + tracing = TRUE; + iso14a_clear_trace(); -// my desfire - static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // known uid - note cascade (0x88), 2nd byte (0x04) = NXP/Phillips + // This function contains the tag emulation + uint8_t sak; + // The first response contains the ATQA (note: bytes are transmitted in reverse order). + uint8_t response1[2]; + + switch (tagType) { + case 1: { // MIFARE Classic + // Says: I am Mifare 1k - original line + response1[0] = 0x04; + response1[1] = 0x00; + sak = 0x08; + } break; + case 2: { // MIFARE Ultralight + // Says: I am a stupid memory tag, no crypto + response1[0] = 0x04; + response1[1] = 0x00; + sak = 0x00; + } break; + case 3: { // MIFARE DESFire + // Says: I am a DESFire tag, ph33r me + response1[0] = 0x04; + response1[1] = 0x03; + sak = 0x20; + } break; + case 4: { // ISO/IEC 14443-4 + // Says: I am a javacard (JCOP) + response1[0] = 0x04; + response1[1] = 0x00; + sak = 0x28; + } break; + default: { + Dbprintf("Error: unkown tagtype (%d)",tagType); + return; + } break; + } + + // The second response contains the (mandatory) first 24 bits of the UID + uint8_t response2[5]; + + // Check if the uid uses the (optional) part + uint8_t response2a[5]; + if (uid_2nd) { + response2[0] = 0x88; + num_to_bytes(uid_1st,3,response2+1); + num_to_bytes(uid_2nd,4,response2a); + response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3]; + + // Configure the ATQA and SAK accordingly + response1[0] |= 0x40; + sak |= 0x04; + } else { + num_to_bytes(uid_1st,4,response2); + // Configure the ATQA and SAK accordingly + response1[0] &= 0xBF; + sak &= 0xFB; + } -// When reader selects us during cascade1 it will send cmd3 -//uint8_t response3[] = { 0x04, 0x00, 0x00 }; // SAK Select (cascade1) successful response (ULTRALITE) -uint8_t response3[] = { 0x24, 0x00, 0x00 }; // SAK Select (cascade1) successful response (DESFire) -ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]); + // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID. + response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3]; -// send cascade2 2nd half of UID -static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; // uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck -// NOTE : THE CRC on the above may be wrong as I have obfuscated the actual UID + // Prepare the mandatory SAK (for 4 and 7 byte UID) + uint8_t response3[3]; + response3[0] = sak; + ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]); -// When reader selects us during cascade2 it will send cmd3a -//uint8_t response3a[] = { 0x00, 0x00, 0x00 }; // SAK Select (cascade2) successful response (ULTRALITE) -uint8_t response3a[] = { 0x20, 0x00, 0x00 }; // SAK Select (cascade2) successful response (DESFire) -ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); + // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit + uint8_t response3a[3]; + response3a[0] = sak & 0xFB; + ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); - static const uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce + uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce + uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS + ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]); - uint8_t *resp; - int respLen; + uint8_t *resp = NULL; + int respLen; - // Longest possible response will be 16 bytes + 2 CRC = 18 bytes + // Longest possible response will be 16 bytes + 2 CRC = 18 bytes // This will need // 144 data bits (18 * 8) // 18 parity bits @@ -1015,41 +1009,41 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); // 166 bytes, since every bit that needs to be send costs us a byte // - // Respond with card type - uint8_t *resp1 = (((uint8_t *)BigBuf) + 800); - int resp1Len; + // Respond with card type + uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + int resp1Len; - // Anticollision cascade1 - respond with uid - uint8_t *resp2 = (((uint8_t *)BigBuf) + 970); - int resp2Len; + // Anticollision cascade1 - respond with uid + uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166); + int resp2Len; - // Anticollision cascade2 - respond with 2nd half of uid if asked - // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88 - uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140); - int resp2aLen; + // Anticollision cascade2 - respond with 2nd half of uid if asked + // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88 + uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140); + int resp2aLen; - // Acknowledge select - cascade 1 - uint8_t *resp3 = (((uint8_t *)BigBuf) + 1310); - int resp3Len; + // Acknowledge select - cascade 1 + uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2)); + int resp3Len; - // Acknowledge select - cascade 2 - uint8_t *resp3a = (((uint8_t *)BigBuf) + 1480); - int resp3aLen; + // Acknowledge select - cascade 2 + uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3)); + int resp3aLen; - // Response to a read request - not implemented atm - uint8_t *resp4 = (((uint8_t *)BigBuf) + 1550); - int resp4Len; + // Response to a read request - not implemented atm + uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4)); +// int resp4Len; - // Authenticate response - nonce - uint8_t *resp5 = (((uint8_t *)BigBuf) + 1720); - int resp5Len; + // Authenticate response - nonce + uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5)); + int resp5Len; - uint8_t *receivedCmd = (uint8_t *)BigBuf; - int len; + // Authenticate response - nonce + uint8_t *resp6 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*6)); + int resp6Len; - //int i; - //int u; - //uint8_t b; + uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); + int len; // To control where we are in the protocol int order = 0; @@ -1059,130 +1053,130 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); int happened = 0; int happened2 = 0; - int cmdsRecvd = 0; - - //int fdt_indicator; + int cmdsRecvd = 0; + uint8_t* respdata = NULL; + int respsize = 0; +// uint8_t nack = 0x04; - memset(receivedCmd, 0x44, 400); + memset(receivedCmd, 0x44, RECV_CMD_SIZE); // Prepare the responses of the anticollision phase // there will be not enough time to do this at the moment the reader sends it REQA // Answer to request CodeIso14443aAsTag(response1, sizeof(response1)); - memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; + memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; // Send our UID (cascade 1) CodeIso14443aAsTag(response2, sizeof(response2)); - memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax; + memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax; // Answer to select (cascade1) CodeIso14443aAsTag(response3, sizeof(response3)); - memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax; + memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax; // Send the cascade 2 2nd part of the uid CodeIso14443aAsTag(response2a, sizeof(response2a)); - memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax; + memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax; // Answer to select (cascade 2) CodeIso14443aAsTag(response3a, sizeof(response3a)); - memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax; + memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax; // Strange answer is an example of rare message size (3 bits) CodeStrangeAnswerAsTag(); - memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax; + memcpy(resp4, ToSend, ToSendMax);// resp4Len = ToSendMax; // Authentication answer (random nonce) CodeIso14443aAsTag(response5, sizeof(response5)); - memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax; + memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax; - // We need to listen to the high-frequency, peak-detected path. - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + // dummy ATS (pseudo-ATR), answer to RATS + CodeIso14443aAsTag(response6, sizeof(response6)); + memcpy(resp6, ToSend, ToSendMax); resp6Len = ToSendMax; + + // We need to listen to the high-frequency, peak-detected path. + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(); - cmdsRecvd = 0; + cmdsRecvd = 0; - LED_A_ON(); + LED_A_ON(); for(;;) { - - if(!GetIso14443aCommandFromReader(receivedCmd, &len, 100)) { - DbpString("button press"); - break; - } - // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated - // Okay, look at the command now. - lastorder = order; - //i = 1; // first byte transmitted - if(receivedCmd[0] == 0x26) { - // Received a REQUEST + + if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) { + DbpString("button press"); + break; + } + + if (tracing) { + LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE); + } + + // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated + // Okay, look at the command now. + lastorder = order; + if(receivedCmd[0] == 0x26) { // Received a REQUEST resp = resp1; respLen = resp1Len; order = 1; - //DbpString("Hello request from reader:"); - } else if(receivedCmd[0] == 0x52) { - // Received a WAKEUP + respdata = response1; + respsize = sizeof(response1); + } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP resp = resp1; respLen = resp1Len; order = 6; -// //DbpString("Wakeup request from reader:"); - - } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // greg - cascade 1 anti-collision - // Received request for UID (cascade 1) + respdata = response1; + respsize = sizeof(response1); + } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1) resp = resp2; respLen = resp2Len; order = 2; -// DbpString("UID (cascade 1) request from reader:"); -// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - - } else if(receivedCmd[1] == 0x20 && receivedCmd[0] ==0x95) { // greg - cascade 2 anti-collision - // Received request for UID (cascade 2) + respdata = response2; + respsize = sizeof(response2); + } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2) resp = resp2a; respLen = resp2aLen; order = 20; -// DbpString("UID (cascade 2) request from reader:"); -// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - - } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x93) { // greg - cascade 1 select - // Received a SELECT + respdata = response2a; + respsize = sizeof(response2a); + } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1) resp = resp3; respLen = resp3Len; order = 3; -// DbpString("Select (cascade 1) request from reader:"); -// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - - } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x95) { // greg - cascade 2 select - // Received a SELECT + respdata = response3; + respsize = sizeof(response3); + } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2) resp = resp3a; respLen = resp3aLen; order = 30; -// DbpString("Select (cascade 2) request from reader:"); -// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - - } else if(receivedCmd[0] == 0x30) { - // Received a READ - resp = resp4; respLen = resp4Len; order = 4; // Do nothing - Dbprintf("Read request from reader: %x %x %x", - receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - - } else if(receivedCmd[0] == 0x50) { - // Received a HALT - resp = resp1; respLen = 0; order = 5; // Do nothing - DbpString("Reader requested we HALT!:"); - - } else if(receivedCmd[0] == 0x60) { - // Received an authentication request - resp = resp5; respLen = resp5Len; order = 7; - Dbprintf("Authenticate request from reader: %x %x %x", - receivedCmd[0], receivedCmd[1], receivedCmd[2]); - - } else if(receivedCmd[0] == 0xE0) { - // Received a RATS request - resp = resp1; respLen = 0;order = 70; - Dbprintf("RATS request from reader: %x %x %x", - receivedCmd[0], receivedCmd[1], receivedCmd[2]); - } else { - // Never seen this command before - Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x", - len, - receivedCmd[0], receivedCmd[1], receivedCmd[2], - receivedCmd[3], receivedCmd[4], receivedCmd[5], - receivedCmd[6], receivedCmd[7], receivedCmd[8]); + respdata = response3a; + respsize = sizeof(response3a); + } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ +// resp = resp4; respLen = resp4Len; order = 4; // Do nothing +// respdata = &nack; +// respsize = sizeof(nack); // 4-bit answer + EmSendCmdEx(data+(4*receivedCmd[0]),16,false); + Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]); + // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below + respLen = 0; + } else if(receivedCmd[0] == 0x50) { // Received a HALT +// DbpString("Reader requested we HALT!:"); // Do not respond resp = resp1; respLen = 0; order = 0; - } + respdata = NULL; + respsize = 0; + } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request + resp = resp5; respLen = resp5Len; order = 7; + respdata = response5; + respsize = sizeof(response5); + } else if(receivedCmd[0] == 0xE0) { // Received a RATS request + resp = resp6; respLen = resp6Len; order = 70; + respdata = response6; + respsize = sizeof(response6); + } else { + if (order == 7 && len ==8) { + uint32_t nr = bytes_to_num(receivedCmd,4); + uint32_t ar = bytes_to_num(receivedCmd+4,4); + Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar); + } else { + // Never seen this command before + Dbprintf("Received unknown command (len=%d):",len); + Dbhexdump(len,receivedCmd,false); + } + // Do not respond + resp = resp1; respLen = 0; order = 0; + respdata = NULL; + respsize = 0; + } // Count number of wakeups received after a halt if(order == 6 && lastorder == 5) { happened++; } @@ -1196,57 +1190,29 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); //i = 0; } - memset(receivedCmd, 0x44, 32); - if(cmdsRecvd > 999) { DbpString("1000 commands later..."); - break; - } - else { + break; + } else { cmdsRecvd++; } - if(respLen <= 0) continue; - //---------------------------- - //u = 0; - //b = 0x00; - //fdt_indicator = FALSE; - - EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52); -/* // Modulate Manchester - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); - AT91C_BASE_SSC->SSC_THR = 0x00; - FpgaSetupSsc(); - - // ### Transmit the response ### - u = 0; - b = 0x00; - fdt_indicator = FALSE; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - (void)b; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - if(i > respLen) { - b = 0x00; - u++; - } else { - b = resp[i]; - i++; - } - AT91C_BASE_SSC->SSC_THR = b; - - if(u > 4) { - break; - } - } - if(BUTTON_PRESS()) { - break; + if(respLen > 0) { + EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52); + } + + if (tracing) { + if (respdata != NULL) { + LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE); } - } -*/ - } + if(traceLen > TRACE_SIZE) { + DbpString("Trace full"); + break; + } + } + + memset(receivedCmd, 0x44, RECV_CMD_SIZE); + } Dbprintf("%x %x %x", happened, happened2, cmdsRecvd); LED_A_OFF(); @@ -1296,68 +1262,9 @@ static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wa } //----------------------------------------------------------------------------- -// Code a 7-bit command without parity bit -// This is especially for 0x26 and 0x52 (REQA and WUPA) +// Prepare reader command (in bits, support short frames) to send to FPGA //----------------------------------------------------------------------------- -void ShortFrameFromReader(const uint8_t bt) -{ - int j; - int last; - uint8_t b; - - ToSendReset(); - - // Start of Communication (Seq. Z) - ToSend[++ToSendMax] = SEC_Z; - last = 0; - - b = bt; - for(j = 0; j < 7; j++) { - if(b & 1) { - // Sequence X - ToSend[++ToSendMax] = SEC_X; - last = 1; - } else { - if(last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } - else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - } - b >>= 1; - } - - // End of Communication - if(last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } - else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - - // Just to be sure! - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - - // Convert from last character reference to length - ToSendMax++; -} - -//----------------------------------------------------------------------------- -// Prepare reader command to send to FPGA -// -//----------------------------------------------------------------------------- -void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) +void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity) { int i, j; int last; @@ -1369,12 +1276,14 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) ToSend[++ToSendMax] = SEC_Z; last = 0; + size_t bytecount = nbytes(bits); // Generate send structure for the data bits - for (i = 0; i < len; i++) { + for (i = 0; i < bytecount; i++) { // Get the current byte to send b = cmd[i]; + size_t bitsleft = MIN((bits-(i*8)),8); - for (j = 0; j < 8; j++) { + for (j = 0; j < bitsleft; j++) { if (b & 1) { // Sequence X ToSend[++ToSendMax] = SEC_X; @@ -1392,19 +1301,22 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) b >>= 1; } - // Get the parity bit - if ((dwParity >> i) & 0x01) { - // Sequence X - ToSend[++ToSendMax] = SEC_X; - last = 1; - } else { - if (last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; + // Only transmit (last) parity bit if we transmitted a complete byte + if (j == 8) { + // Get the parity bit + if ((dwParity >> i) & 0x01) { + // Sequence X + ToSend[++ToSendMax] = SEC_X; + last = 1; } else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } } } } @@ -1430,6 +1342,14 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) ToSendMax++; } +//----------------------------------------------------------------------------- +// Prepare reader command to send to FPGA +//----------------------------------------------------------------------------- +void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) +{ + CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity); +} + //----------------------------------------------------------------------------- // Wait for commands from reader // Stop when button is pressed (return 1) or field was gone (return 2) @@ -1627,43 +1547,33 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int } } -void ReaderTransmitShort(const uint8_t* bt) +void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par) { int wait = 0; int samples = 0; - - ShortFrameFromReader(*bt); - - // Select the card - TransmitFor14443a(ToSend, ToSendMax, &samples, &wait); - - // Store reader command in buffer - if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE); -} - -void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par) -{ - int wait = 0; - int samples = 0; - + // This is tied to other size changes // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024; - CodeIso14443aAsReaderPar(frame,len,par); - + CodeIso14443aBitsAsReaderPar(frame,bits,par); + // Select the card TransmitFor14443a(ToSend, ToSendMax, &samples, &wait); if(trigger) LED_A_ON(); - + // Store reader command in buffer - if (tracing) LogTrace(frame,len,0,par,TRUE); + if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE); } +void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par) +{ + ReaderTransmitBitsPar(frame,len*8,par); +} void ReaderTransmit(uint8_t* frame, int len) { // Generate parity and redirect - ReaderTransmitPar(frame,len,GetParity(frame,len)); + ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len)); } int ReaderReceive(uint8_t* receivedAnswer) @@ -1688,90 +1598,117 @@ int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr) /* performs iso14443a anticolision procedure * fills the uid pointer unless NULL * fills resp_data unless NULL */ -int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) { - uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP - uint8_t sel_all[] = { 0x93,0x20 }; - uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; - uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 - - uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes - - uint8_t sak = 0x04; // cascade uid - int cascade_level = 0; - - int len; +int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) { + uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP + uint8_t sel_all[] = { 0x93,0x20 }; + uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; + uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 + uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes + byte_t uid_resp[4]; + size_t uid_resp_len; + + uint8_t sak = 0x04; // cascade uid + int cascade_level = 0; + int len; + + // Broadcast for a card, WUPA (0x52) will force response from all cards in the field + ReaderTransmitBitsPar(wupa,7,0); + // Receive the ATQA + if(!ReaderReceive(resp)) return 0; +// Dbprintf("atqa: %02x %02x",resp[0],resp[1]); + + if(p_hi14a_card) { + memcpy(p_hi14a_card->atqa, resp, 2); + p_hi14a_card->uidlen = 0; + memset(p_hi14a_card->uid,0,10); + } - // clear uid - memset(uid_ptr, 0, 8); - - // Broadcast for a card, WUPA (0x52) will force response from all cards in the field - ReaderTransmitShort(wupa); - // Receive the ATQA - if(!ReaderReceive(resp)) return 0; + // clear uid + if (uid_ptr) { + memset(uid_ptr,0,8); + } - if(resp_data) - memcpy(resp_data->atqa, resp, 2); - - // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in - // which case we need to make a cascade 2 request and select - this is a long UID - // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. - for(; sak & 0x04; cascade_level++) - { - // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) - sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; + // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in + // which case we need to make a cascade 2 request and select - this is a long UID + // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. + for(; sak & 0x04; cascade_level++) { + // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) + sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; - // SELECT_ALL - ReaderTransmit(sel_all,sizeof(sel_all)); - if (!ReaderReceive(resp)) return 0; - if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4); - + // SELECT_ALL + ReaderTransmit(sel_all,sizeof(sel_all)); + if (!ReaderReceive(resp)) return 0; + + // First backup the current uid + memcpy(uid_resp,resp,4); + uid_resp_len = 4; + // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]); + // calculate crypto UID - if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4); + if(cuid_ptr) { + *cuid_ptr = bytes_to_num(uid_resp, 4); + } - // Construct SELECT UID command + // Construct SELECT UID command memcpy(sel_uid+2,resp,5); - AppendCrc14443a(sel_uid,7); - ReaderTransmit(sel_uid,sizeof(sel_uid)); + AppendCrc14443a(sel_uid,7); + ReaderTransmit(sel_uid,sizeof(sel_uid)); + + // Receive the SAK + if (!ReaderReceive(resp)) return 0; + sak = resp[0]; + + // Test if more parts of the uid are comming + if ((sak & 0x04) && uid_resp[0] == 0x88) { + // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of: + // http://www.nxp.com/documents/application_note/AN10927.pdf + memcpy(uid_resp, uid_resp + 1, 3); + uid_resp_len = 3; + } + + if(uid_ptr) { + memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); + } + + if(p_hi14a_card) { + memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); + p_hi14a_card->uidlen += uid_resp_len; + } + } - // Receive the SAK - if (!ReaderReceive(resp)) return 0; - sak = resp[0]; - } - if(resp_data) { - resp_data->sak = sak; - resp_data->ats_len = 0; - } - //-- this byte not UID, it CT. http://www.nxp.com/documents/application_note/AN10927.pdf page 3 - if (uid_ptr[0] == 0x88) { - memcpy(uid_ptr, uid_ptr + 1, 7); - uid_ptr[7] = 0; - } + if(p_hi14a_card) { + p_hi14a_card->sak = sak; + p_hi14a_card->ats_len = 0; + } - if( (sak & 0x20) == 0) - return 2; // non iso14443a compliant tag + if( (sak & 0x20) == 0) { + return 2; // non iso14443a compliant tag + } - // Request for answer to select - if(resp_data) { // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!! - AppendCrc14443a(rats, 2); - ReaderTransmit(rats, sizeof(rats)); - - if (!(len = ReaderReceive(resp))) return 0; - - memcpy(resp_data->ats, resp, sizeof(resp_data->ats)); - resp_data->ats_len = len; - } + // Request for answer to select + AppendCrc14443a(rats, 2); + ReaderTransmit(rats, sizeof(rats)); + + if (!(len = ReaderReceive(resp))) return 0; + + if(p_hi14a_card) { + memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats)); + p_hi14a_card->ats_len = len; + } - return 1; + // reset the PCB block number + iso14_pcb_blocknum = 0; + return 1; } void iso14443a_setup() { - // Setup SSC - FpgaSetupSsc(); + // Set up the synchronous serial port + FpgaSetupSsc(); // Start from off (no field generated) // Signal field is off with the appropriate LED LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + SpinDelay(50); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); @@ -1779,7 +1716,7 @@ void iso14443a_setup() { // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - SpinDelay(200); + SpinDelay(50); iso14a_timeout = 2048; //default } @@ -1787,35 +1724,54 @@ void iso14443a_setup() { int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { uint8_t real_cmd[cmd_len+4]; real_cmd[0] = 0x0a; //I-Block + // put block number into the PCB + real_cmd[0] |= iso14_pcb_blocknum; real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards memcpy(real_cmd+2, cmd, cmd_len); AppendCrc14443a(real_cmd,cmd_len+2); ReaderTransmit(real_cmd, cmd_len+4); size_t len = ReaderReceive(data); - if(!len) - return -1; //DATA LINK ERROR - + uint8_t * data_bytes = (uint8_t *) data; + if (!len) + return 0; //DATA LINK ERROR + // if we received an I- or R(ACK)-Block with a block number equal to the + // current block number, toggle the current block number + else if (len >= 4 // PCB+CID+CRC = 4 bytes + && ((data_bytes[0] & 0xC0) == 0 // I-Block + || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0 + && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers + { + iso14_pcb_blocknum ^= 1; + } + return len; } - //----------------------------------------------------------------------------- // Read an ISO 14443a tag. Send out commands and store answers. // //----------------------------------------------------------------------------- -void ReaderIso14443a(UsbCommand * c, UsbCommand * ack) +void ReaderIso14443a(UsbCommand * c) { iso14a_command_t param = c->arg[0]; uint8_t * cmd = c->d.asBytes; size_t len = c->arg[1]; - - if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1); + uint32_t arg0 = 0; + byte_t buf[USB_CMD_DATA_SIZE]; + + iso14a_clear_trace(); + iso14a_set_tracing(true); + + if(param & ISO14A_REQUEST_TRIGGER) { + iso14a_set_trigger(1); + } if(param & ISO14A_CONNECT) { iso14443a_setup(); - ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + arg0 = iso14443a_select_card(NULL,(iso14a_card_select_t*)buf,NULL); + cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(iso14a_card_select_t)); +// UsbSendPacket((void *)ack, sizeof(UsbCommand)); } if(param & ISO14A_SET_TIMEOUT) { @@ -1827,8 +1783,9 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack) } if(param & ISO14A_APDU) { - ack->arg[0] = iso14_apdu(cmd, len, ack->d.asBytes); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + arg0 = iso14_apdu(cmd, len, buf); + cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); +// UsbSendPacket((void *)ack, sizeof(UsbCommand)); } if(param & ISO14A_RAW) { @@ -1837,67 +1794,303 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack) len += 2; } ReaderTransmit(cmd,len); - ack->arg[0] = ReaderReceive(ack->d.asBytes); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + arg0 = ReaderReceive(buf); +// UsbSendPacket((void *)ack, sizeof(UsbCommand)); + cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); } - if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0); + if(param & ISO14A_REQUEST_TRIGGER) { + iso14a_set_trigger(0); + } - if(param & ISO14A_NO_DISCONNECT) + if(param & ISO14A_NO_DISCONNECT) { return; + } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); } + +#define TEST_LENGTH 100 +typedef struct mftest{ + uint8_t nt[8]; + uint8_t count; +}mftest ; + +/** + *@brief Tunes the mifare attack settings. This method checks the nonce entropy when + *using a specified timeout. + *Different cards behave differently, some cards require up to a second to power down (and thus reset + *token generator), other cards are fine with 50 ms. + * + * @param time + * @return the entropy. A value of 100 (%) means that every nonce was unique, while a value close to + *zero indicates a low entropy: the given timeout is sufficient to power down the card. + */ +int TuneMifare(int time) +{ + // Mifare AUTH + uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b }; + uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + + iso14443a_setup(); + int TIME1=time; + int TIME2=2000; + uint8_t uid[8]; + uint32_t cuid; + byte_t nt[4]; + Dbprintf("Tuning... testing a delay of %d ms (press button to skip)",time); + + + mftest nt_values[TEST_LENGTH]; + int nt_size = 0; + int i = 0; + for(i = 0 ; i< 100 ; i++) + { + LED_C_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(TIME1); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + LED_C_ON(); + SpinDelayUs(TIME2); + if(!iso14443a_select_card(uid, NULL, &cuid)) continue; + + // Transmit MIFARE_CLASSIC_AUTH + ReaderTransmit(mf_auth, sizeof(mf_auth)); + + // Receive the (16 bit) "random" nonce + if (!ReaderReceive(receivedAnswer)) continue; + memcpy(nt, receivedAnswer, 4); + + //store it + int already_stored = 0; + for(int i = 0 ; i < nt_size && !already_stored; i++) + { + if( memcmp(nt, nt_values[i].nt, 4) == 0) + { + nt_values[i].count++; + already_stored = 1; + } + } + if(!already_stored) + { + mftest* ptr= &nt_values[nt_size++]; + //Clear it before use + memset(ptr, 0, sizeof(mftest)); + memcpy(ptr->nt, nt, 4); + ptr->count = 1; + } + + if(BUTTON_PRESS()) + { + Dbprintf("Tuning aborted prematurely"); + break; + } + } + /* + for(int i = 0 ; i < nt_size;i++){ + mftest x = nt_values[i]; + Dbprintf("%d,%d,%d,%d : %d",x.nt[0],x.nt[1],x.nt[2],x.nt[3],x.count); + } + */ + int result = nt_size *100 / i; + Dbprintf(" ... results for %d ms : %d %",time, result); + return result; +} + //----------------------------------------------------------------------------- // Read an ISO 14443a tag. Send out commands and store answers. // //----------------------------------------------------------------------------- -void ReaderMifare(uint32_t parameter) +#define STATE_SIZE 100 +typedef struct AttackState{ + byte_t nt[4]; + byte_t par_list[8]; + byte_t ks_list[8]; + byte_t par; + byte_t par_low; + byte_t nt_diff; + uint8_t mf_nr_ar[8]; +} AttackState; + + +int continueAttack(AttackState* pState,uint8_t* receivedAnswer) +{ + + // Transmit reader nonce and reader answer + ReaderTransmitPar(pState->mf_nr_ar, sizeof(pState->mf_nr_ar),pState->par); + + // Receive 4 bit answer + int len = ReaderReceive(receivedAnswer); + if (!len) + { + if (pState->nt_diff == 0) + { + pState->par++; + } else { + pState->par = (((pState->par >> 3) + 1) << 3) | pState->par_low; + } + return 2; + } + if(pState->nt_diff == 0) + { + pState->par_low = pState->par & 0x07; + } + //Dbprintf("answer received, parameter (%d), (memcmp(nt, nt_no)=%d",parameter,memcmp(nt, nt_noattack, 4)); + //if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue; + //isNULL = 0;//|| !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0); + // + // if ( /*(isNULL != 0 ) && */(memcmp(nt, nt_attacked, 4) != 0) ) continue; + + //led_on = !led_on; + //if(led_on) LED_B_ON(); else LED_B_OFF(); + pState->par_list[pState->nt_diff] = pState->par; + pState->ks_list[pState->nt_diff] = receivedAnswer[0] ^ 0x05; + + // Test if the information is complete + if (pState->nt_diff == 0x07) { + return 0; + } + + pState->nt_diff = (pState->nt_diff + 1) & 0x07; + pState->mf_nr_ar[3] = pState->nt_diff << 5; + pState->par = pState->par_low; + return 1; +} + +void reportResults(uint8_t uid[8],AttackState *pState, int isOK) +{ + LogTrace(pState->nt, 4, 0, GetParity(pState->nt, 4), TRUE); + LogTrace(pState->par_list, 8, 0, GetParity(pState->par_list, 8), TRUE); + LogTrace(pState->ks_list, 8, 0, GetParity(pState->ks_list, 8), TRUE); + + byte_t buf[48]; + memcpy(buf + 0, uid, 4); + if(pState != NULL) + { + memcpy(buf + 4, pState->nt, 4); + memcpy(buf + 8, pState->par_list, 8); + memcpy(buf + 16, pState->ks_list, 8); + } + + LED_B_ON(); + cmd_send(CMD_ACK,isOK,0,0,buf,48); + LED_B_OFF(); + + // Thats it... + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); + tracing = TRUE; + + if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED"); +} + +void ReaderMifareBegin(uint32_t offset_time, uint32_t powerdown_time); + +/** + * @brief New implementation of ReaderMifare, the classic mifare attack. + * This implementation is backwards-compatible, but has some added parameters. + * @param c the usbcommand in complete + * c->arg[0] - nt_noattack (deprecated) + * c->arg[1] - offset_time us (0 => random) + * c->arg[2] - powerdown_time ms (0=> tuning) + * + */ +void ReaderMifare(UsbCommand *c) +{ + /* + * The 'no-attack' is not used anymore, with the introduction of + * state tables. Instead, we use an offset which is random. This means that we + * should not get stuck on a 'bad' nonce, so no-attack is not needed. + * Anyway, arg[0] is reserved for backwards compatibility + uint32_t nt_noattack_uint = c->arg[0]; + byte_t nt_noattack[4]; + num_to_bytes(parameter, 4, nt_noattack_uint); + + */ + /* + *IF, for some reason, you want to attack a specific nonce or whatever, + *you can specify the offset time yourself, in which case it won't be random. + * + * The offset time is microseconds, MICROSECONDS, not ms. + */ + uint32_t offset_time = c->arg[1]; + if(offset_time == 0) + { + //[Martin:]I would like to have used rand(), but linking problems prevented it + //offset_time = rand() % 4000; + //So instead, I found this nifty thingy, which seems to fit the bill + offset_time = GetTickCount() % 2000; + } + /* + * There is an implementation of tuning. Tuning will try to determine + * a good power-down time, which is different for different cards. + * If a value is specified from the packet, we won't do any tuning. + * A value of zero will initialize a tuning. + * The power-down time is milliseconds, that MILLI-seconds . + */ + uint32_t powerdown_time = c->arg[2]; + if(powerdown_time == 0) + { + //Tuning required + int entropy = 100; + int time = 25; + entropy = TuneMifare(time); + + while(entropy > 50 && time < 2000){ + //Increase timeout, but never more than 500ms at a time + time = MIN(time*2, time+500); + entropy = TuneMifare(time); + } + if(entropy > 50){ + Dbprintf("OBS! This card has high entropy (%d) and slow power-down. This may take a while", entropy); + } + powerdown_time = time; + } + //The actual attack + ReaderMifareBegin(offset_time, powerdown_time); +} +void ReaderMifareBegin(uint32_t offset_time, uint32_t powerdown_time) { - // Mifare AUTH + Dbprintf("Using power-down-time of %d ms, offset time %d us", powerdown_time, offset_time); + + /** + *Allocate our state-table and initialize with zeroes + **/ + + AttackState states[STATE_SIZE] ; + //Dbprintf("Memory allocated ok! (%d bytes)",STATE_SIZE*sizeof(AttackState) ); + memset(states, 0, STATE_SIZE*sizeof(AttackState)); + + // Mifare AUTH uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b }; - uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; + uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes - uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes - traceLen = 0; + traceLen = 0; tracing = false; iso14443a_setup(); - LED_A_ON(); LED_B_OFF(); LED_C_OFF(); - byte_t nt_diff = 0; LED_A_OFF(); - byte_t par = 0; - //byte_t par_mask = 0xff; - byte_t par_low = 0; - int led_on = TRUE; uint8_t uid[8]; uint32_t cuid; - tracing = FALSE; - byte_t nt[4] = {0,0,0,0}; - byte_t nt_attacked[4], nt_noattack[4]; - byte_t par_list[8] = {0,0,0,0,0,0,0,0}; - byte_t ks_list[8] = {0,0,0,0,0,0,0,0}; - num_to_bytes(parameter, 4, nt_noattack); - int isOK = 0, isNULL = 0; - - while(TRUE) + byte_t nt[4]; + int nts_attacked= 0; + //Keeps track of progress (max value of nt_diff for our states) + int progress = 0; + int high_entropy_warning_issued = 0; + while(!BUTTON_PRESS()) { - LED_C_ON(); + LED_C_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + SpinDelay(powerdown_time); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - LED_C_OFF(); - - // Test if the action was cancelled - if(BUTTON_PRESS()) { - break; - } + LED_C_ON(); + SpinDelayUs(offset_time); if(!iso14443a_select_card(uid, NULL, &cuid)) continue; @@ -1906,74 +2099,66 @@ void ReaderMifare(uint32_t parameter) // Receive the (16 bit) "random" nonce if (!ReaderReceive(receivedAnswer)) continue; - memcpy(nt, receivedAnswer, 4); - - // Transmit reader nonce and reader answer - ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par); - - // Receive 4 bit answer - if (ReaderReceive(receivedAnswer)) - { - if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue; - - isNULL = (nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0); - if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue; - - if (nt_diff == 0) - { - LED_A_ON(); - memcpy(nt_attacked, nt, 4); - //par_mask = 0xf8; - par_low = par & 0x07; - } - - led_on = !led_on; - if(led_on) LED_B_ON(); else LED_B_OFF(); - par_list[nt_diff] = par; - ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; - - // Test if the information is complete - if (nt_diff == 0x07) { - isOK = 1; - break; - } - - nt_diff = (nt_diff + 1) & 0x07; - mf_nr_ar[3] = nt_diff << 5; - par = par_low; - } else { - if (nt_diff == 0) - { - par++; - } else { - par = (((par >> 3) + 1) << 3) | par_low; - } - } - } + memcpy(nt, receivedAnswer, 4); + + //Now we have the NT. Check if this NT is already under attack + AttackState* pState = NULL; + int i = 0; + for(i = 0 ; i < nts_attacked && pState == NULL; i++) + { + if( memcmp(nt, states[i].nt, 4) == 0) + { + //we have it + pState = &states[i]; + //Dbprintf("Existing state found (%d)", i); + } + } - LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE); - LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE); - LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE); + if(pState == NULL){ + if(nts_attacked < STATE_SIZE ) + { + //Initialize a new state + pState = &states[nts_attacked++]; + //Clear it before use + memset(pState, 0, sizeof(AttackState)); + memcpy(pState->nt, nt, 4); + i = nts_attacked; + //Dbprintf("New state created, nt="); + }else if(!high_entropy_warning_issued){ + /** + *If we wound up here, it means that the state table was eaten up by potential nonces. This could be fixed by + *increasing the size of the state buffer, however, it points to some other problem. Ideally, we should get the same nonce + *every time. Realistically we should get a few different nonces, but if we get more than 50, there is probably somehting + *else that is wrong. An attack using too high nonce entropy will take **LONG** time to finish. + */ + DbpString("WARNING: Nonce entropy is suspiciously high, something is wrong. Check timeouts (and perhaps increase STATE_SIZE)"); + high_entropy_warning_issued = 1; + } + } + if(pState == NULL) continue; - UsbCommand ack = {CMD_ACK, {isOK, 0, 0}}; - memcpy(ack.d.asBytes + 0, uid, 4); - memcpy(ack.d.asBytes + 4, nt, 4); - memcpy(ack.d.asBytes + 8, par_list, 8); - memcpy(ack.d.asBytes + 16, ks_list, 8); - - LED_B_ON(); - UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand)); - LED_B_OFF(); + int result = continueAttack(pState, receivedAnswer); - // Thats it... - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LEDsoff(); - tracing = TRUE; - - if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED"); + if(result == 1){ + //One state progressed another step + if(pState->nt_diff > progress) + { + progress = pState->nt_diff; + //Alert the user + Dbprintf("Recovery progress: %d/8, NTs attacked: %d ", progress,nts_attacked ); + } + //Dbprintf("State increased to %d in state %d", pState->nt_diff, i); + } + else if(result == 2){ + //Dbprintf("Continue attack no answer, par is now %d", pState->par); + } + else if(result == 0){ + reportResults(uid,pState,1); + return; + } + } + reportResults(uid,NULL,0); } - - //----------------------------------------------------------------------------- // MIFARE 1K simulate. // @@ -2079,7 +2264,7 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) } if (cardSTATE != MFEMUL_NOFIELD) { - res = EmGetCmd(receivedCmd, &len, 100); // (+ nextCycleTimeout) + res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout) if (res == 2) { cardSTATE = MFEMUL_NOFIELD; LEDsoff(); @@ -2393,9 +2578,7 @@ lbWORK: if (len == 0) break; cardSTATE = MFEMUL_WORK; break; } - } - } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); @@ -2407,3 +2590,149 @@ lbWORK: if (len == 0) break; if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen); } + +//----------------------------------------------------------------------------- +// MIFARE sniffer. +// +//----------------------------------------------------------------------------- +void RAMFUNC SniffMifare(uint8_t param) { + // param: + // bit 0 - trigger from first card answer + // bit 1 - trigger from first reader 7-bit request + + // C(red) A(yellow) B(green) + LEDsoff(); + // init trace buffer + iso14a_clear_trace(); + + // The command (reader -> tag) that we're receiving. + // The length of a received command will in most cases be no more than 18 bytes. + // So 32 should be enough! + uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); + // The response (tag -> reader) that we're receiving. + uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET); + + // As we receive stuff, we copy it from receivedCmd or receivedResponse + // into trace, along with its length and other annotations. + //uint8_t *trace = (uint8_t *)BigBuf; + + // The DMA buffer, used to stream samples from the FPGA + int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; + int8_t *data = dmaBuf; + int maxDataLen = 0; + int dataLen = 0; + + // Set up the demodulator for tag -> reader responses. + Demod.output = receivedResponse; + Demod.len = 0; + Demod.state = DEMOD_UNSYNCD; + + // Set up the demodulator for the reader -> tag commands + memset(&Uart, 0, sizeof(Uart)); + Uart.output = receivedCmd; + Uart.byteCntMax = 32; // was 100 (greg)////////////////// + Uart.state = STATE_UNSYNCD; + + // Setup for the DMA. + FpgaSetupSsc(); + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); + + // And put the FPGA in the appropriate mode + // Signal field is off with the appropriate LED + LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // init sniffer + MfSniffInit(); + int sniffCounter = 0; + + // And now we loop, receiving samples. + while(true) { + if(BUTTON_PRESS()) { + DbpString("cancelled by button"); + goto done; + } + + LED_A_ON(); + WDT_HIT(); + + if (++sniffCounter > 65) { + if (MfSniffSend(2000)) { + FpgaEnableSscDma(); + } + sniffCounter = 0; + } + + int register readBufDataP = data - dmaBuf; + int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; + if (readBufDataP <= dmaBufDataP){ + dataLen = dmaBufDataP - readBufDataP; + } else { + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1; + } + // test for length of buffer + if(dataLen > maxDataLen) { + maxDataLen = dataLen; + if(dataLen > 400) { + Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); + goto done; + } + } + if(dataLen < 1) continue; + + // primary buffer was stopped( <-- we lost data! + if (!AT91C_BASE_PDC_SSC->PDC_RCR) { + AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; + AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; + Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary + } + // secondary buffer sets as primary, secondary buffer was stopped + if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; + AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; + } + + LED_A_OFF(); + + if(MillerDecoding((data[0] & 0xF0) >> 4)) { + LED_C_INV(); + // check - if there is a short 7bit request from reader + if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break; + + /* And ready to receive another command. */ + Uart.state = STATE_UNSYNCD; + + /* And also reset the demod code */ + Demod.state = DEMOD_UNSYNCD; + } + + if(ManchesterDecoding(data[0] & 0x0F)) { + LED_C_INV(); + + if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; + + // And ready to receive another response. + memset(&Demod, 0, sizeof(Demod)); + Demod.output = receivedResponse; + Demod.state = DEMOD_UNSYNCD; + + /* And also reset the uart code */ + Uart.state = STATE_UNSYNCD; + } + + data++; + if(data > dmaBuf + DMA_BUFFER_SIZE) { + data = dmaBuf; + } + } // main cycle + + DbpString("COMMAND FINISHED"); + +done: + FpgaDisableSscDma(); + MfSniffEnd(); + + Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax); + LEDsoff(); +}