X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/0ab9002f36f8297c640cf9920c06d106ccae2d70..3d2c9c9b066c5a0b6a8dab467d86561223ddac10:/armsrc/iso15693.c diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index f4120512..7fdf2a35 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -68,27 +68,14 @@ static int DEBUG = 0; /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 2 - Air Interface -// This section basicly contains transmission and receiving of bits +// This section basically contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -#define Crc(data,datalen) Iso15693Crc(data,datalen) -#define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) -#define sprintUID(target,uid) Iso15693sprintUID(target,uid) - // buffers -#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 +#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 #define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet #define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet -// timing. Delays in SSP_CLK ticks. -// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag -#define DELAY_READER_TO_ARM_SIM 8 -#define DELAY_ARM_TO_READER_SIM 1 -#define DELAY_ISO15693_VCD_TO_VICC_SIM 132 // 132/423.75kHz = 311.5us from end of command EOF to start of tag response -//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader -#define DELAY_ISO15693_VCD_TO_VICC_READER 1056 // 1056/3,39MHz = 311.5us from end of command EOF to start of tag response -#define DELAY_ISO15693_VICC_TO_VCD_READER 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command - // --------------------------- // Signal Processing // --------------------------- @@ -228,22 +215,72 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) } -static void CodeIso15693AsTag(uint8_t *cmd, int n) -{ +// static uint8_t encode4Bits(const uint8_t b) { + // uint8_t c = b & 0xF; + // // OTA, the least significant bits first + // // The columns are + // // 1 - Bit value to send + // // 2 - Reversed (big-endian) + // // 3 - Manchester Encoded + // // 4 - Hex values + + // switch(c){ + // // 1 2 3 4 + // case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55 + // case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95 + // case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65 + // case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5 + // case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59 + // case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99 + // case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69 + // case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9 + // case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56 + // case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96 + // case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66 + // case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6 + // case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a + // case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a + // case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a + // default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa + + // } +// } + +void CodeIso15693AsTag(uint8_t *cmd, size_t len) { + /* + * SOF comprises 3 parts; + * * An unmodulated time of 56.64 us + * * 24 pulses of 423.75 kHz (fc/32) + * * A logic 1, which starts with an unmodulated time of 18.88us + * followed by 8 pulses of 423.75kHz (fc/32) + * + * EOF comprises 3 parts: + * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated + * time of 18.88us. + * - 24 pulses of fc/32 + * - An unmodulated time of 56.64 us + * + * A logic 0 starts with 8 pulses of fc/32 + * followed by an unmodulated time of 256/fc (~18,88us). + * + * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by + * 8 pulses of fc/32 (also 18.88us) + * + * A bit here becomes 8 pulses of fc/32. Therefore: + * The SOF can be written as 00011101 = 0x1D + * The EOF can be written as 10111000 = 0xb8 + * A logic 1 is 01 + * A logic 0 is 10 + * + * */ + ToSendReset(); // SOF - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x1D; // 00011101 // data - for(int i = 0; i < n; i++) { + for(int i = 0; i < len; i++) { for(int j = 0; j < 8; j++) { if ((cmd[i] >> j) & 0x01) { ToSendStuffBit(0); @@ -256,14 +293,7 @@ static void CodeIso15693AsTag(uint8_t *cmd, int n) } // EOF - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); + ToSend[++ToSendMax] = 0xB8; // 10111000 ToSendMax++; } @@ -297,41 +327,41 @@ static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) //----------------------------------------------------------------------------- // Transmit the tag response (to the reader) that was placed in cmd[]. //----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) -{ +void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) { // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); uint8_t shift_delay = start_time & 0x00000007; - uint8_t bitmask = 0x00; - for (int i = 0; i < shift_delay; i++) { - bitmask |= (0x01 << i); - } while (GetCountSspClk() < (start_time & 0xfffffff8)) ; - AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY - LED_C_ON(); uint8_t bits_to_shift = 0x00; - for(size_t c = 0; c <= len; c++) { - uint8_t bits_to_send = bits_to_shift << (8 - shift_delay) | (c==len?0x00:cmd[c]) >> shift_delay; - bits_to_shift = cmd[c] & bitmask; + uint8_t bits_to_send = 0x00; + for(size_t c = 0; c < len; c++) { for (int i = 7; i >= 0; i--) { + uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00; for (int j = 0; j < (slow?4:1); ) { + bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay; + bits_to_shift = cmd_bits; if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { - if (bits_to_send >> i & 0x01) { - AT91C_BASE_SSC->SSC_THR = 0xff; - } else { - AT91C_BASE_SSC->SSC_THR = 0x00; - } + AT91C_BASE_SSC->SSC_THR = bits_to_send; j++; } - WDT_HIT(); } } + WDT_HIT(); } + // send the remaining bits, padded with 0: + bits_to_send = bits_to_shift << (8 - shift_delay); + for ( ; ; ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + AT91C_BASE_SSC->SSC_THR = bits_to_send; + break; + } + } LED_C_OFF(); + } @@ -682,9 +712,9 @@ static void DecodeReaderReset(DecodeReader_t* DecodeReader) static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) { - switch(DecodeReader->state) { + switch (DecodeReader->state) { case STATE_READER_UNSYNCD: - if(!bit) { + if (!bit) { // we went low, so this could be the beginning of a SOF DecodeReader->posCount = 1; DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; @@ -693,14 +723,14 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF: DecodeReader->posCount++; - if(bit) { // detected rising edge - if(DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) + if (bit) { // detected rising edge + if (DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) DecodeReaderReset(DecodeReader); } else { // SOF DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; } } else { - if(DecodeReader->posCount > 5) { // stayed low for too long + if (DecodeReader->posCount > 5) { // stayed low for too long DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting @@ -710,7 +740,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: DecodeReader->posCount++; - if(!bit) { // detected a falling edge + if (!bit) { // detected a falling edge if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) DecodeReaderReset(DecodeReader); } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding @@ -723,7 +753,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; } } else { - if(DecodeReader->posCount > 29) { // stayed high for too long + if (DecodeReader->posCount > 29) { // stayed high for too long DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting @@ -881,19 +911,18 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin // 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). +// (returns len) or someone presses the pushbutton on the board (returns -1). // // Assume that we're called with the SSC (to the FPGA) and ADC path set // correctly. //----------------------------------------------------------------------------- -static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) -{ +int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) { int samples = 0; bool gotFrame = false; uint8_t b; - uint8_t *dmaBuf = BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE); + uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; // the decoder data structure DecodeReader_t DecodeReader = {0}; @@ -910,21 +939,21 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 (void) temp; while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; - uint32_t bit_time = GetCountSspClk() & 0xfffffff8; + uint32_t dma_start_time = GetCountSspClk() & 0xfffffff8; // Setup and start DMA. FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint8_t *upTo = dmaBuf; - for(;;) { + for (;;) { uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); if (behindBy == 0) continue; b = *upTo++; - if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); break; } @@ -936,7 +965,7 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 for (int i = 7; i >= 0; i--) { if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { - *eof_time = bit_time + samples - DELAY_READER_TO_ARM_SIM; // end of EOF + *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM_SIM; // end of EOF gotFrame = true; break; } @@ -948,22 +977,24 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 } if (BUTTON_PRESS()) { - DecodeReader.byteCount = 0; + DecodeReader.byteCount = -1; break; } WDT_HIT(); } - FpgaDisableSscDma(); - BigBuf_free_keep_EM(); if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); if (DecodeReader.byteCount > 0) { - LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, *eof_time, NULL, true); + uint32_t sof_time = *eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128:2048) // time for byte transfers + - 32 // time for SOF transfer + - 16; // time for EOF transfer + LogTrace(DecodeReader.output, DecodeReader.byteCount, sof_time, *eof_time, NULL, true); } return DecodeReader.byteCount; @@ -985,7 +1016,7 @@ static void BuildIdentifyRequest(void) // no mask cmd[2] = 0x00; //Now the CRC - crc = Crc(cmd, 3); + crc = Iso15693Crc(cmd, 3); cmd[3] = crc & 0xff; cmd[4] = crc >> 8; @@ -1219,7 +1250,7 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) // Block number to read cmd[10] = blockNumber; //Now the CRC - crc = Crc(cmd, 11); // the crc needs to be calculated over 11 bytes + crc = Iso15693Crc(cmd, 11); // the crc needs to be calculated over 11 bytes cmd[11] = crc & 0xff; cmd[12] = crc >> 8; @@ -1246,7 +1277,7 @@ static void BuildInventoryResponse(uint8_t *uid) cmd[8] = uid[1]; //0x05; cmd[9] = uid[0]; //0xe0; //Now the CRC - crc = Crc(cmd, 10); + crc = Iso15693Crc(cmd, 10); cmd[10] = crc & 0xff; cmd[11] = crc >> 8; @@ -1341,7 +1372,7 @@ void DbdecodeIso15693Answer(int len, uint8_t *d) { strncat(status,"NoErr ", DBD15STATLEN); } - crc=Crc(d,len-2); + crc=Iso15693Crc(d,len-2); if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) strncat(status,"CrcOK",DBD15STATLEN); else @@ -1526,12 +1557,12 @@ void BruteforceIso15693Afi(uint32_t speed) data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1; data[1] = ISO15693_INVENTORY; data[2] = 0; // mask length - datalen = AddCrc(data,3); + datalen = Iso15693AddCrc(data,3); recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen>=12) { - Dbprintf("NoAFI UID=%s", sprintUID(NULL, &recv[2])); + Dbprintf("NoAFI UID=%s", Iso15693sprintUID(NULL, &recv[2])); } // now with AFI @@ -1543,12 +1574,12 @@ void BruteforceIso15693Afi(uint32_t speed) for (int i = 0; i < 256; i++) { data[2] = i & 0xFF; - datalen = AddCrc(data,4); + datalen = Iso15693AddCrc(data,4); recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen >= 12) { - Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); + Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); } } Dbprintf("AFI Bruteforcing done."); @@ -1646,7 +1677,7 @@ void SetTag15693Uid(uint8_t *uid) for (int i=0; i<4; i++) { // Add the CRC - crc = Crc(cmd[i], 7); + crc = Iso15693Crc(cmd[i], 7); cmd[i][7] = crc & 0xff; cmd[i][8] = crc >> 8; @@ -1702,7 +1733,7 @@ static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid) cmd[8] = 0x05; cmd[9]= 0xe0; // always e0 (not exactly unique) //Now the CRC - crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 10); // the crc needs to be calculated over 2 bytes cmd[10] = crc & 0xff; cmd[11] = crc >> 8; @@ -1737,7 +1768,7 @@ static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid) // Number of Blocks to read cmd[11] = 0x2f; // read quite a few //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8; @@ -1772,7 +1803,7 @@ static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t C // cmd[12] = 0x00; // cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8; @@ -1807,7 +1838,7 @@ static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], u // cmd[12] = 0x00; // cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8;