X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f87941bd2248f89afa6c91b0f7c93a05b01bc4c1..90e278d3daf11b501043d7ae628a25aeb0227420:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 3e86a846..9a80a177 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -23,13 +23,93 @@ static uint32_t iso14a_timeout; uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET; -int traceLen = 0; int rsamples = 0; +int traceLen = 0; int tracing = TRUE; uint8_t trigger = 0; // the block number for the ISO14443-4 PCB static uint8_t iso14_pcb_blocknum = 0; +// +// ISO14443 timing: +// +// minimum time between the start bits of consecutive transfers from reader to tag: 7000 carrier (13.56Mhz) cycles +#define REQUEST_GUARD_TIME (7000/16 + 1) +// minimum time between last modulation of tag and next start bit from reader to tag: 1172 carrier cycles +#define FRAME_DELAY_TIME_PICC_TO_PCD (1172/16 + 1) +// bool LastCommandWasRequest = FALSE; + +// +// Total delays including SSC-Transfers between ARM and FPGA. These are in carrier clock cycles (1/13,56MHz) +// +// When the PM acts as reader and is receiving tag data, it takes +// 3 ticks delay in the AD converter +// 16 ticks until the modulation detector completes and sets curbit +// 8 ticks until bit_to_arm is assigned from curbit +// 8*16 ticks for the transfer from FPGA to ARM +// 4*16 ticks until we measure the time +// - 8*16 ticks because we measure the time of the previous transfer +#define DELAY_AIR2ARM_AS_READER (3 + 16 + 8 + 8*16 + 4*16 - 8*16) + +// When the PM acts as a reader and is sending, it takes +// 4*16 ticks until we can write data to the sending hold register +// 8*16 ticks until the SHR is transferred to the Sending Shift Register +// 8 ticks until the first transfer starts +// 8 ticks later the FPGA samples the data +// 1 tick to assign mod_sig_coil +#define DELAY_ARM2AIR_AS_READER (4*16 + 8*16 + 8 + 8 + 1) + +// When the PM acts as tag and is receiving it takes +// 2 ticks delay in the RF part (for the first falling edge), +// 3 ticks for the A/D conversion, +// 8 ticks on average until the start of the SSC transfer, +// 8 ticks until the SSC samples the first data +// 7*16 ticks to complete the transfer from FPGA to ARM +// 8 ticks until the next ssp_clk rising edge +// 4*16 ticks until we measure the time +// - 8*16 ticks because we measure the time of the previous transfer +#define DELAY_AIR2ARM_AS_TAG (2 + 3 + 8 + 8 + 7*16 + 8 + 4*16 - 8*16) + +// The FPGA will report its internal sending delay in +uint16_t FpgaSendQueueDelay; +// the 5 first bits are the number of bits buffered in mod_sig_buf +// the last three bits are the remaining ticks/2 after the mod_sig_buf shift +#define DELAY_FPGA_QUEUE (FpgaSendQueueDelay<<1) + +// When the PM acts as tag and is sending, it takes +// 4*16 ticks until we can write data to the sending hold register +// 8*16 ticks until the SHR is transferred to the Sending Shift Register +// 8 ticks until the first transfer starts +// 8 ticks later the FPGA samples the data +// + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf) +// + 1 tick to assign mod_sig_coil +#define DELAY_ARM2AIR_AS_TAG (4*16 + 8*16 + 8 + 8 + DELAY_FPGA_QUEUE + 1) + +// When the PM acts as sniffer and is receiving tag data, it takes +// 3 ticks A/D conversion +// 14 ticks to complete the modulation detection +// 8 ticks (on average) until the result is stored in to_arm +// + the delays in transferring data - which is the same for +// sniffing reader and tag data and therefore not relevant +#define DELAY_TAG_AIR2ARM_AS_SNIFFER (3 + 14 + 8) + +// When the PM acts as sniffer and is receiving reader data, it takes +// 2 ticks delay in analogue RF receiver (for the falling edge of the +// start bit, which marks the start of the communication) +// 3 ticks A/D conversion +// 8 ticks on average until the data is stored in to_arm. +// + the delays in transferring data - which is the same for +// sniffing reader and tag data and therefore not relevant +#define DELAY_READER_AIR2ARM_AS_SNIFFER (2 + 3 + 8) + +//variables used for timing purposes: +//these are in ssp_clk cycles: +uint32_t NextTransferTime; +uint32_t LastTimeProxToAirStart; +uint32_t LastProxToAirDuration; + + + // CARD TO READER - manchester // Sequence D: 11110000 modulation with subcarrier during first half // Sequence E: 00001111 modulation with subcarrier during second half @@ -70,7 +150,7 @@ void iso14a_set_trigger(bool enable) { } void iso14a_clear_trace() { - memset(trace, 0x44, TRACE_SIZE); + memset(trace, 0x44, TRACE_SIZE); traceLen = 0; } @@ -110,274 +190,187 @@ void AppendCrc14443a(uint8_t* data, int len) } // The function LogTrace() is also used by the iClass implementation in iClass.c -int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader) +bool RAMFUNC LogTrace(const uint8_t * btBytes, uint8_t iLen, uint32_t timestamp, uint32_t dwParity, bool readerToTag) { - // Return when trace is full - if (traceLen >= TRACE_SIZE) return FALSE; - - // Trace the random, i'm curious - rsamples += iSamples; - trace[traceLen++] = ((rsamples >> 0) & 0xff); - trace[traceLen++] = ((rsamples >> 8) & 0xff); - trace[traceLen++] = ((rsamples >> 16) & 0xff); - trace[traceLen++] = ((rsamples >> 24) & 0xff); - if (!bReader) { - trace[traceLen - 1] |= 0x80; - } - trace[traceLen++] = ((dwParity >> 0) & 0xff); - trace[traceLen++] = ((dwParity >> 8) & 0xff); - trace[traceLen++] = ((dwParity >> 16) & 0xff); - trace[traceLen++] = ((dwParity >> 24) & 0xff); - trace[traceLen++] = iLen; - memcpy(trace + traceLen, btBytes, iLen); - traceLen += iLen; - return TRUE; + if (!tracing) return FALSE; + // Return when trace is full + if (traceLen + sizeof(timestamp) + sizeof(dwParity) + iLen >= TRACE_SIZE) { + tracing = FALSE; // don't trace any more + return FALSE; + } + + // Trace the random, i'm curious + trace[traceLen++] = ((timestamp >> 0) & 0xff); + trace[traceLen++] = ((timestamp >> 8) & 0xff); + trace[traceLen++] = ((timestamp >> 16) & 0xff); + trace[traceLen++] = ((timestamp >> 24) & 0xff); + + if (!readerToTag) { + trace[traceLen - 1] |= 0x80; + } + trace[traceLen++] = ((dwParity >> 0) & 0xff); + trace[traceLen++] = ((dwParity >> 8) & 0xff); + trace[traceLen++] = ((dwParity >> 16) & 0xff); + trace[traceLen++] = ((dwParity >> 24) & 0xff); + trace[traceLen++] = iLen; + if (btBytes != NULL && iLen != 0) { + memcpy(trace + traceLen, btBytes, iLen); + } + traceLen += iLen; + return TRUE; } -//----------------------------------------------------------------------------- -// The software UART that receives commands from the reader, and its state -// variables. +//============================================================================= +// ISO 14443 Type A - Miller decoder +//============================================================================= +// Basics: +// This decoder is used when the PM3 acts as a tag. +// The reader will generate "pauses" by temporarily switching of the field. +// At the PM3 antenna we will therefore measure a modulated antenna voltage. +// The FPGA does a comparison with a threshold and would deliver e.g.: +// ........ 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 ....... +// The Miller decoder needs to identify the following sequences: +// 2 (or 3) ticks pause followed by 6 (or 5) ticks unmodulated: pause at beginning - Sequence Z ("start of communication" or a "0") +// 8 ticks without a modulation: no pause - Sequence Y (a "0" or "end of communication" or "no information") +// 4 ticks unmodulated followed by 2 (or 3) ticks pause: pause in second half - Sequence X (a "1") +// Note 1: the bitstream may start at any time. We therefore need to sync. +// Note 2: the interpretation of Sequence Y and Z depends on the preceding sequence. //----------------------------------------------------------------------------- static tUart Uart; -static RAMFUNC int MillerDecoding(int bit) -{ - //int error = 0; - int bitright; - - if(!Uart.bitBuffer) { - Uart.bitBuffer = bit ^ 0xFF0; - return FALSE; - } - else { - Uart.bitBuffer <<= 4; - Uart.bitBuffer ^= bit; - } +// Lookup-Table to decide if 4 raw bits are a modulation. +// We accept two or three consecutive "0" in any position with the rest "1" +const bool Mod_Miller_LUT[] = { + TRUE, TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, + TRUE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE +}; +#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x00F0) >> 4]) +#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x000F)]) - int EOC = FALSE; +void UartReset() +{ + Uart.state = STATE_UNSYNCD; + Uart.bitCount = 0; + Uart.len = 0; // number of decoded data bytes + Uart.shiftReg = 0; // shiftreg to hold decoded data bits + Uart.parityBits = 0; // + Uart.twoBits = 0x0000; // buffer for 2 Bits + Uart.highCnt = 0; + Uart.startTime = 0; + Uart.endTime = 0; +} - if(Uart.state != STATE_UNSYNCD) { - Uart.posCnt++; - if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) { - bit = 0x00; - } - else { - bit = 0x01; - } - if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) { - bitright = 0x00; - } - else { - bitright = 0x01; - } - if(bit != bitright) { bit = bitright; } +// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time +static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) +{ - if(Uart.posCnt == 1) { - // measurement first half bitperiod - if(!bit) { - Uart.drop = DROP_FIRST_HALF; - } - } - else { - // measurement second half bitperiod - if(!bit & (Uart.drop == DROP_NONE)) { - Uart.drop = DROP_SECOND_HALF; + Uart.twoBits = (Uart.twoBits << 8) | bit; + + if (Uart.state == STATE_UNSYNCD) { // not yet synced + if (Uart.highCnt < 7) { // wait for a stable unmodulated signal + if (Uart.twoBits == 0xffff) { + Uart.highCnt++; + } else { + Uart.highCnt = 0; } - else if(!bit) { - // measured a drop in first and second half - // which should not be possible - Uart.state = STATE_ERROR_WAIT; - //error = 0x01; + } else { + Uart.syncBit = 0xFFFF; // not set + // look for 00xx1111 (the start bit) + if ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; + else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6; + else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5; + else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4; + else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3; + else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2; + else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1; + else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0; + if (Uart.syncBit != 0xFFFF) { + Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); + Uart.startTime -= Uart.syncBit; + Uart.endTime = Uart.startTime; + Uart.state = STATE_START_OF_COMMUNICATION; } + } - Uart.posCnt = 0; - - switch(Uart.state) { - case STATE_START_OF_COMMUNICATION: - Uart.shiftReg = 0; - if(Uart.drop == DROP_SECOND_HALF) { - // error, should not happen in SOC - Uart.state = STATE_ERROR_WAIT; - //error = 0x02; - } - else { - // correct SOC - Uart.state = STATE_MILLER_Z; - } - break; - - case STATE_MILLER_Z: - Uart.bitCnt++; - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // logic '0' followed by sequence Y - // end of communication - Uart.state = STATE_UNSYNCD; - EOC = TRUE; - } - // if(Uart.drop == DROP_FIRST_HALF) { - // Uart.state = STATE_MILLER_Z; stay the same - // we see a logic '0' } - if(Uart.drop == DROP_SECOND_HALF) { - // we see a logic '1' - Uart.shiftReg |= 0x100; - Uart.state = STATE_MILLER_X; - } - break; - - case STATE_MILLER_X: - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // sequence Y, we see a '0' - Uart.state = STATE_MILLER_Y; - Uart.bitCnt++; - } - if(Uart.drop == DROP_FIRST_HALF) { - // Would be STATE_MILLER_Z - // but Z does not follow X, so error - Uart.state = STATE_ERROR_WAIT; - //error = 0x03; - } - if(Uart.drop == DROP_SECOND_HALF) { - // We see a '1' and stay in state X - Uart.shiftReg |= 0x100; - Uart.bitCnt++; - } - break; - - case STATE_MILLER_Y: - Uart.bitCnt++; - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // logic '0' followed by sequence Y - // end of communication - Uart.state = STATE_UNSYNCD; - EOC = TRUE; - } - if(Uart.drop == DROP_FIRST_HALF) { - // we see a '0' - Uart.state = STATE_MILLER_Z; - } - if(Uart.drop == DROP_SECOND_HALF) { - // We see a '1' and go to state X - Uart.shiftReg |= 0x100; - Uart.state = STATE_MILLER_X; - } - break; + } else { - case STATE_ERROR_WAIT: - // That went wrong. Now wait for at least two bit periods - // and try to sync again - if(Uart.drop == DROP_NONE) { - Uart.highCnt = 6; - Uart.state = STATE_UNSYNCD; + if (IsMillerModulationNibble1(Uart.twoBits >> Uart.syncBit)) { + if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation in both halves - error + UartReset(); + Uart.highCnt = 6; + } else { // Modulation in first half = Sequence Z = logic "0" + if (Uart.state == STATE_MILLER_X) { // error - must not follow after X + UartReset(); + Uart.highCnt = 6; + } else { + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg + Uart.state = STATE_MILLER_Z; + Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 6; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; } - break; - - default: - Uart.state = STATE_UNSYNCD; - Uart.highCnt = 0; - break; - } - - Uart.drop = DROP_NONE; - - // should have received at least one whole byte... - if((Uart.bitCnt == 2) && EOC && (Uart.byteCnt > 0)) { - return TRUE; + } } - - if(Uart.bitCnt == 9) { - Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff); - Uart.byteCnt++; - - Uart.parityBits <<= 1; - Uart.parityBits ^= ((Uart.shiftReg >> 8) & 0x01); - - if(EOC) { - // when End of Communication received and - // all data bits processed.. + } else { + if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation second half = Sequence X = logic "1" + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg + Uart.state = STATE_MILLER_X; + Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 2; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the new parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; + } + } else { // no modulation in both halves - Sequence Y + if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication + Uart.state = STATE_UNSYNCD; + if(Uart.len == 0 && Uart.bitCount > 0) { // if we decoded some bits + Uart.shiftReg >>= (9 - Uart.bitCount); // add them to the output + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // no parity bit - add "0" + Uart.bitCount--; // last "0" was part of the EOC sequence + } return TRUE; } - Uart.bitCnt = 0; - } - - /*if(error) { - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = error & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - return TRUE; - }*/ - } - - } - else { - bit = Uart.bitBuffer & 0xf0; - bit >>= 4; - bit ^= 0x0F; - if(bit) { - // should have been high or at least (4 * 128) / fc - // according to ISO this should be at least (9 * 128 + 20) / fc - if(Uart.highCnt == 8) { - // we went low, so this could be start of communication - // it turns out to be safer to choose a less significant - // syncbit... so we check whether the neighbour also represents the drop - Uart.posCnt = 1; // apparently we are busy with our first half bit period - Uart.syncBit = bit & 8; - Uart.samples = 3; - if(!Uart.syncBit) { Uart.syncBit = bit & 4; Uart.samples = 2; } - else if(bit & 4) { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; } - if(!Uart.syncBit) { Uart.syncBit = bit & 2; Uart.samples = 1; } - else if(bit & 2) { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; } - if(!Uart.syncBit) { Uart.syncBit = bit & 1; Uart.samples = 0; - if(Uart.syncBit && (Uart.bitBuffer & 8)) { - Uart.syncBit = 8; - - // the first half bit period is expected in next sample - Uart.posCnt = 0; - Uart.samples = 3; + if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC + UartReset(); + Uart.highCnt = 6; + } else { // a logic "0" + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg + Uart.state = STATE_MILLER_Y; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; } } - else if(bit & 1) { Uart.syncBit = bit & 1; Uart.samples = 0; } - - Uart.syncBit <<= 4; - Uart.state = STATE_START_OF_COMMUNICATION; - Uart.drop = DROP_FIRST_HALF; - Uart.bitCnt = 0; - Uart.byteCnt = 0; - Uart.parityBits = 0; - //error = 0; - } - else { - Uart.highCnt = 0; } } - else { - if(Uart.highCnt < 8) { - Uart.highCnt++; - } - } - } + + } - return FALSE; + return FALSE; // not finished yet, need more data } + + //============================================================================= // ISO 14443 Type A - Manchester decoder //============================================================================= // Basics: +// This decoder is used when the PM3 acts as a reader. // The tag will modulate the reader field by asserting different loads to it. As a consequence, the voltage // at the reader antenna will be modulated as well. The FPGA detects the modulation for us and would deliver e.g. the following: // ........ 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ....... @@ -386,161 +379,110 @@ static RAMFUNC int MillerDecoding(int bit) // 4 ticks unmodulated followed by 4 ticks modulated: Sequence E = 0 // 8 ticks unmodulated: Sequence F = end of communication // 8 ticks modulated: A collision. Save the collision position and treat as Sequence D -// Note 1: the bitstream may start at any time (either in first or second nibble within the parameter bit). We therefore need to sync. +// Note 1: the bitstream may start at any time. We therefore need to sync. // Note 2: parameter offset is used to determine the position of the parity bits (required for the anticollision command only) static tDemod Demod; -inline RAMFUNC bool IsModulation(byte_t b) -{ - if (b >= 5 || b == 3) // majority decision: 2 or more bits are set - return true; - else - return false; - -} +// Lookup-Table to decide if 4 raw bits are a modulation. +// We accept three or four "1" in any position +const bool Mod_Manchester_LUT[] = { + FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, + FALSE, FALSE, FALSE, TRUE, FALSE, TRUE, TRUE, TRUE +}; -inline RAMFUNC bool IsModulationNibble1(byte_t b) -{ - return IsModulation((b & 0xE0) >> 5); -} +#define IsManchesterModulationNibble1(b) (Mod_Manchester_LUT[(b & 0x00F0) >> 4]) +#define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)]) -inline RAMFUNC bool IsModulationNibble2(byte_t b) + +void DemodReset() { - return IsModulation((b & 0x0E) >> 1); + Demod.state = DEMOD_UNSYNCD; + Demod.len = 0; // number of decoded data bytes + Demod.shiftReg = 0; // shiftreg to hold decoded data bits + Demod.parityBits = 0; // + Demod.collisionPos = 0; // Position of collision bit + Demod.twoBits = 0xffff; // buffer for 2 Bits + Demod.highCnt = 0; + Demod.startTime = 0; + Demod.endTime = 0; } -static RAMFUNC int ManchesterDecoding(int bit, uint16_t offset) +// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time +static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time) { + + Demod.twoBits = (Demod.twoBits << 8) | bit; - switch (Demod.state) { - - case DEMOD_UNSYNCD: // not yet synced - Demod.len = 0; // initialize number of decoded data bytes - Demod.bitCount = offset; // initialize number of decoded data bits - Demod.shiftReg = 0; // initialize shiftreg to hold decoded data bits - Demod.parityBits = 0; // initialize parity bits - Demod.collisionPos = 0; // Position of collision bit - - if (IsModulationNibble1(bit) - && !IsModulationNibble2(bit)) { // this is the start bit - Demod.samples = 8; - if(trigger) LED_A_OFF(); + if (Demod.state == DEMOD_UNSYNCD) { + + if (Demod.highCnt < 2) { // wait for a stable unmodulated signal + if (Demod.twoBits == 0x0000) { + Demod.highCnt++; + } else { + Demod.highCnt = 0; + } + } else { + Demod.syncBit = 0xFFFF; // not set + if ((Demod.twoBits & 0x7700) == 0x7000) Demod.syncBit = 7; + else if ((Demod.twoBits & 0x3B80) == 0x3800) Demod.syncBit = 6; + else if ((Demod.twoBits & 0x1DC0) == 0x1C00) Demod.syncBit = 5; + else if ((Demod.twoBits & 0x0EE0) == 0x0E00) Demod.syncBit = 4; + else if ((Demod.twoBits & 0x0770) == 0x0700) Demod.syncBit = 3; + else if ((Demod.twoBits & 0x03B8) == 0x0380) Demod.syncBit = 2; + else if ((Demod.twoBits & 0x01DC) == 0x01C0) Demod.syncBit = 1; + else if ((Demod.twoBits & 0x00EE) == 0x00E0) Demod.syncBit = 0; + if (Demod.syncBit != 0xFFFF) { + Demod.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); + Demod.startTime -= Demod.syncBit; + Demod.bitCount = offset; // number of decoded data bits Demod.state = DEMOD_MANCHESTER_DATA; - } else if (!IsModulationNibble1(bit) && IsModulationNibble2(bit)) { // this may be the first half of the start bit - Demod.samples = 4; - Demod.state = DEMOD_HALF_SYNCD; } - break; + } + } else { - case DEMOD_HALF_SYNCD: - Demod.samples += 8; - if (IsModulationNibble1(bit)) { // error: this was not a start bit. - Demod.state = DEMOD_UNSYNCD; - } else { - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - } - break; - - - case DEMOD_MOD_FIRST_HALF: - Demod.samples += 8; - Demod.bitCount++; - if (IsModulationNibble1(bit)) { // modulation in both halfs - collision + if (IsManchesterModulationNibble1(Demod.twoBits >> Demod.syncBit)) { // modulation in first half + if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // ... and in second half = collision if (!Demod.collisionPos) { Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; } } // modulation in first half only - Sequence D = 1 - Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the parity bit + Demod.bitCount++; + Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg + if(Demod.bitCount == 9) { // if we decoded a full byte (including parity) Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); + Demod.parityBits <<= 1; // make room for the parity bit Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; } - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - break; - - - case DEMOD_NOMOD_FIRST_HALF: - if (IsModulationNibble1(bit)) { // modulation in second half only - Sequence E = 0 + Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1) - 4; + } else { // no modulation in first half + if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // and modulation in second half = Sequence E = 0 Demod.bitCount++; - Demod.samples += 8; - Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg + Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the new parity bit Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); + Demod.parityBits <<= 1; // make room for the new parity bit Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; } + Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1); } else { // no modulation in both halves - End of communication - Demod.samples += 4; - if(Demod.bitCount > 0) { // if we decoded bits - Demod.shiftReg >>= (9 - Demod.bitCount); // add the remaining decoded bits to the output - Demod.output[Demod.len++] = Demod.shiftReg & 0xff; - // No parity bit, so just shift a 0 - Demod.parityBits <<= 1; - } - Demod.state = DEMOD_UNSYNCD; // start from the beginning - return TRUE; // we are finished with decoding the raw data sequence - } - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - break; - - - case DEMOD_MANCHESTER_DATA: - Demod.samples += 8; - if (IsModulationNibble1(bit)) { // modulation in first half - if (IsModulationNibble2(bit) & 0x0f) { // ... and in second half = collision - if (!Demod.collisionPos) { - Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; - } - } // modulation in first half only - Sequence D = 1 - Demod.bitCount++; - Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the parity bit - Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); - Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit - Demod.bitCount = 0; - Demod.shiftReg = 0; - } - } else { // no modulation in first half - if (IsModulationNibble2(bit)) { // and modulation in second half = Sequence E = 0 - Demod.bitCount++; - Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the new parity bit - Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); - Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit - Demod.bitCount = 0; - Demod.shiftReg = 0; - } - } else { // no modulation in both halves - End of communication + if (Demod.len > 0 || Demod.bitCount > 0) { // received something if(Demod.bitCount > 0) { // if we decoded bits Demod.shiftReg >>= (9 - Demod.bitCount); // add the remaining decoded bits to the output Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // No parity bit, so just shift a 0 Demod.parityBits <<= 1; } - Demod.state = DEMOD_UNSYNCD; // start from the beginning return TRUE; // we are finished with decoding the raw data sequence + } else { // nothing received. Start over + DemodReset(); } } + } } @@ -565,13 +507,14 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { LEDsoff(); // init trace buffer iso14a_clear_trace(); + iso14a_set_tracing(TRUE); // 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); - + bool 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! @@ -584,40 +527,31 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { //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; + uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + uint8_t *data = dmaBuf; + uint8_t previous_data = 0; int maxDataLen = 0; int dataLen = 0; + bool TagIsActive = FALSE; + bool ReaderIsActive = FALSE; + + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); // 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(); + // Setup and start DMA. 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); - - // 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) { + for(uint32_t rsamples = 0; TRUE; ) { + if(BUTTON_PRESS()) { DbpString("cancelled by button"); - goto done; + break; } LED_A_ON(); @@ -628,14 +562,14 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { if (readBufDataP <= dmaBufDataP){ dataLen = dmaBufDataP - readBufDataP; } else { - dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1; + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; } // test for length of buffer if(dataLen > maxDataLen) { maxDataLen = dataLen; if(dataLen > 400) { - Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); - goto done; + Dbprintf("blew circular buffer! dataLen=%d", dataLen); + break; } } if(dataLen < 1) continue; @@ -644,6 +578,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { 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) { @@ -653,50 +588,61 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { LED_A_OFF(); - rsamples += 4; - if(MillerDecoding((data[0] & 0xF0) >> 4)) { - LED_C_ON(); + if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder + + if(!TagIsActive) { // no need to try decoding reader data if the tag is sending + uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); + if (MillerDecoding(readerdata, (rsamples-1)*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; + // check - if there is a short 7bit request from reader + if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE; - if(triggered) { - if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break; + if(triggered) { + if (!LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, Uart.parityBits, TRUE)) break; + if (!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break; + } + /* 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(); + LED_B_OFF(); + } + ReaderIsActive = (Uart.state != STATE_UNSYNCD); } - /* 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], 0)) { - LED_B_ON(); + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time + uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); + if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) { + LED_B_ON(); - if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break; + if (!LogTrace(receivedResponse, Demod.len, Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, Demod.parityBits, FALSE)) break; + if (!LogTrace(NULL, 0, Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, 0, FALSE)) break; - if ((!triggered) && (param & 0x01)) triggered = TRUE; + 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(); + // And ready to receive another response. + DemodReset(); + LED_C_OFF(); + } + TagIsActive = (Demod.state != DEMOD_UNSYNCD); + } } + previous_data = *data; + rsamples++; data++; - if(data > dmaBuf + DMA_BUFFER_SIZE) { + if(data == dmaBuf + DMA_BUFFER_SIZE) { data = dmaBuf; } } // main cycle DbpString("COMMAND FINISHED"); -done: - 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]); + FpgaDisableSscDma(); + Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len); + Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]); LEDsoff(); } @@ -721,6 +667,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity // Send startbit ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; for(i = 0; i < len; i++) { int j; @@ -739,8 +686,10 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity // Get the parity bit if ((dwParity >> i) & 0x01) { ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; } else { ToSend[++ToSendMax] = SEC_E; + LastProxToAirDuration = 8 * ToSendMax; } } @@ -755,48 +704,6 @@ static void CodeIso14443aAsTag(const uint8_t *cmd, int len){ CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len)); } -////----------------------------------------------------------------------------- -//// This is to send a NACK kind of answer, its only 3 bits, I know it should be 4 -////----------------------------------------------------------------------------- -//static void CodeStrangeAnswerAsTag() -//{ -// int i; -// -// ToSendReset(); -// -// // Correction bit, might be removed when not needed -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(1); // 1 -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// -// // Send startbit -// ToSend[++ToSendMax] = SEC_D; -// -// // 0 -// ToSend[++ToSendMax] = SEC_E; -// -// // 0 -// ToSend[++ToSendMax] = SEC_E; -// -// // 1 -// ToSend[++ToSendMax] = SEC_D; -// -// // Send stopbit -// ToSend[++ToSendMax] = SEC_F; -// -// // Flush the buffer in FPGA!! -// for(i = 0; i < 5; i++) { -// ToSend[++ToSendMax] = SEC_F; -// } -// -// // Convert from last byte pos to length -// ToSendMax++; -//} static void Code4bitAnswerAsTag(uint8_t cmd) { @@ -821,8 +728,10 @@ static void Code4bitAnswerAsTag(uint8_t cmd) for(i = 0; i < 4; i++) { if(b & 1) { ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; } else { ToSend[++ToSendMax] = SEC_E; + LastProxToAirDuration = 8 * ToSendMax; } b >>= 1; } @@ -830,11 +739,6 @@ static void Code4bitAnswerAsTag(uint8_t cmd) // Send stopbit ToSend[++ToSendMax] = SEC_F; - // Flush the buffer in FPGA!! - for(i = 0; i < 5; i++) { - ToSend[++ToSendMax] = SEC_F; - } - // Convert from last byte pos to length ToSendMax++; } @@ -853,40 +757,37 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); // Now run a `software UART' on the stream of incoming samples. + UartReset(); Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; + + // clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; 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; - if(MillerDecoding((b & 0xf0) >> 4)) { - *len = Uart.byteCnt; - return TRUE; - } - if(MillerDecoding(b & 0x0f)) { - *len = Uart.byteCnt; + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + if(MillerDecoding(b, 0)) { + *len = Uart.len; return TRUE; } - } + } } } -static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded); -int EmSend4bitEx(uint8_t resp, int correctionNeeded); +static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, bool correctionNeeded); +int EmSend4bitEx(uint8_t resp, bool 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 EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par); +int EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par); +int EmSendCmdEx(uint8_t *resp, int respLen, bool correctionNeeded); int EmSendCmd(uint8_t *resp, int respLen); int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par); +bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint32_t reader_Parity, + uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint32_t tag_Parity); static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); @@ -895,6 +796,7 @@ typedef struct { size_t response_n; uint8_t* modulation; size_t modulation_n; + uint32_t ProxToAirDuration; } tag_response_info_t; void reset_free_buffer() { @@ -902,7 +804,7 @@ void reset_free_buffer() { } bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) { - // Exmaple response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes + // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes // This will need the following byte array for a modulation sequence // 144 data bits (18 * 8) // 18 parity bits @@ -926,8 +828,9 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe // Copy the byte array, used for this modulation to the buffer position memcpy(response_info->modulation,ToSend,ToSendMax); - // Store the number of bytes that were used for encoding/modulation + // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them response_info->modulation_n = ToSendMax; + response_info->ProxToAirDuration = LastProxToAirDuration; return true; } @@ -956,10 +859,9 @@ bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) { // Enable and clear the trace - tracing = TRUE; iso14a_clear_trace(); + iso14a_set_tracing(TRUE); - // This function contains the tag emulation uint8_t sak; // The first response contains the ATQA (note: bytes are transmitted in reverse order). @@ -1034,41 +936,41 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) uint8_t response6[] = { 0x04, 0x58, 0x00, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]); - #define TAG_RESPONSE_COUNT 7 - tag_response_info_t responses[TAG_RESPONSE_COUNT] = { - { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type - { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid - { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked - { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 - { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 - { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) - { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS - }; - - // Allocate 512 bytes for the dynamic modulation, created when the reader querries for it - // Such a response is less time critical, so we can prepare them on the fly - #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 - #define DYNAMIC_MODULATION_BUFFER_SIZE 512 - uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; - uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; - tag_response_info_t dynamic_response_info = { - .response = dynamic_response_buffer, - .response_n = 0, - .modulation = dynamic_modulation_buffer, - .modulation_n = 0 - }; + #define TAG_RESPONSE_COUNT 7 + tag_response_info_t responses[TAG_RESPONSE_COUNT] = { + { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type + { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid + { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked + { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 + { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 + { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) + { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS + }; + + // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it + // Such a response is less time critical, so we can prepare them on the fly + #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 + #define DYNAMIC_MODULATION_BUFFER_SIZE 512 + uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; + uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; + tag_response_info_t dynamic_response_info = { + .response = dynamic_response_buffer, + .response_n = 0, + .modulation = dynamic_modulation_buffer, + .modulation_n = 0 + }; - // Reset the offset pointer of the free buffer - reset_free_buffer(); + // Reset the offset pointer of the free buffer + reset_free_buffer(); - // Prepare the responses of the anticollision phase + // Prepare the responses of the anticollision phase // there will be not enough time to do this at the moment the reader sends it REQA - for (size_t i=0; i 0) { - // Copy the CID from the reader query - dynamic_response_info.response[1] = receivedCmd[1]; + if (dynamic_response_info.response_n > 0) { + // Copy the CID from the reader query + dynamic_response_info.response[1] = receivedCmd[1]; - // Add CRC bytes, always used in ISO 14443A-4 compliant cards - AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); - dynamic_response_info.response_n += 2; + // Add CRC bytes, always used in ISO 14443A-4 compliant cards + AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); + dynamic_response_info.response_n += 2; - if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { - Dbprintf("Error preparing tag response"); - break; - } - p_response = &dynamic_response_info; - } + if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { + Dbprintf("Error preparing tag response"); + if (tracing) { + LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + } + break; + } + p_response = &dynamic_response_info; + } } // Count number of wakeups received after a halt @@ -1200,12 +1117,6 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) // Count number of other messages after a halt if(order != 6 && lastorder == 5) { happened2++; } - // Look at last parity bit to determine timing of answer - if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) { - // 1236, so correction bit needed - //i = 0; - } - if(cmdsRecvd > 999) { DbpString("1000 commands later..."); break; @@ -1213,16 +1124,25 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) cmdsRecvd++; if (p_response != NULL) { - EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); - if (tracing) { - LogTrace(p_response->response,p_response->response_n,0,SwapBits(GetParity(p_response->response,p_response->response_n),p_response->response_n),FALSE); - if(traceLen > TRACE_SIZE) { - DbpString("Trace full"); -// break; - } - } - } - } + EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + p_response->response, + p_response->response_n, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(p_response->response, p_response->response_n), p_response->response_n)); + } + + if (!tracing) { + Dbprintf("Trace Full. Simulation stopped."); + break; + } + } Dbprintf("%x %x %x", happened, happened2, cmdsRecvd); LED_A_OFF(); @@ -1242,7 +1162,7 @@ void PrepareDelayedTransfer(uint16_t delay) for (uint16_t i = 0; i < delay; i++) { bitmask |= (0x01 << i); } - ToSend[++ToSendMax] = 0x00; + ToSend[ToSendMax++] = 0x00; for (uint16_t i = 0; i < ToSendMax; i++) { bits_to_shift = ToSend[i] & bitmask; ToSend[i] = ToSend[i] >> delay; @@ -1252,38 +1172,48 @@ void PrepareDelayedTransfer(uint16_t delay) } } -//----------------------------------------------------------------------------- + +//------------------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. // Parameter timing: -// if NULL: ignored -// if == 0: return time of transfer +// if NULL: transfer at next possible time, taking into account +// request guard time and frame delay time +// if == 0: transfer immediately and return time of transfer // if != 0: delay transfer until time specified -//----------------------------------------------------------------------------- +//------------------------------------------------------------------------------------- static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing) { - int c; - + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + uint32_t ThisTransferTime = 0; if (timing) { if(*timing == 0) { // Measure time - *timing = (GetCountMifare() + 8) & 0xfffffff8; + *timing = (GetCountSspClk() + 8) & 0xfffffff8; } else { PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) } - if(MF_DBGLEVEL >= 4 && GetCountMifare() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); - while(GetCountMifare() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) - } - - for(c = 0; c < 10;) { // standard delay for each transfer (allow tag to be ready after last transmission?) - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - c++; - } + if(MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); + while(GetCountSspClk() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) + LastTimeProxToAirStart = *timing; + } else { + ThisTransferTime = ((MAX(NextTransferTime, GetCountSspClk()) & 0xfffffff8) + 8); + while(GetCountSspClk() < ThisTransferTime); + LastTimeProxToAirStart = ThisTransferTime; } - c = 0; + // clear TXRDY + AT91C_BASE_SSC->SSC_THR = SEC_Y; + + // for(uint16_t c = 0; c < 10;) { // standard delay for each transfer (allow tag to be ready after last transmission) + // if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + // AT91C_BASE_SSC->SSC_THR = SEC_Y; + // c++; + // } + // } + + uint16_t c = 0; for(;;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = cmd[c]; @@ -1293,88 +1223,91 @@ static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing) } } } - + + NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME); + } + //----------------------------------------------------------------------------- // Prepare reader command (in bits, support short frames) to send to FPGA //----------------------------------------------------------------------------- void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity) { - int i, j; - int last; - uint8_t b; - - ToSendReset(); - - // Start of Communication (Seq. Z) - ToSend[++ToSendMax] = SEC_Z; - last = 0; - - size_t bytecount = nbytes(bits); - // Generate send structure for the data bits - 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 < bitsleft; 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; - } + int i, j; + int last; + uint8_t b; - // 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 { - if (last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - } - } - } + ToSendReset(); - // 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; + // Start of Communication (Seq. Z) + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + last = 0; + + size_t bytecount = nbytes(bits); + // Generate send structure for the data bits + 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 < bitsleft; j++) { + if (b & 1) { + // Sequence X + ToSend[++ToSendMax] = SEC_X; + LastProxToAirDuration = 8 * (ToSendMax+1) - 2; + last = 1; + } else { + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + } + b >>= 1; + } + + // 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; + LastProxToAirDuration = 8 * (ToSendMax+1) - 2; + last = 1; + } else { + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + } + } + } - // Just to be sure! - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; + // End of Communication: Logic 0 followed by Sequence Y + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + ToSend[++ToSendMax] = SEC_Y; - // Convert from last character reference to length - ToSendMax++; + // Convert to length of command: + ToSendMax++; } //----------------------------------------------------------------------------- @@ -1390,7 +1323,7 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) // Stop when button is pressed (return 1) or field was gone (return 2) // Or return 0 when command is captured //----------------------------------------------------------------------------- -static int EmGetCmd(uint8_t *received, int *len, int maxLen) +static int EmGetCmd(uint8_t *received, int *len) { *len = 0; @@ -1415,9 +1348,11 @@ static int EmGetCmd(uint8_t *received, int *len, int maxLen) AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; // Now run a 'software UART' on the stream of incoming samples. + UartReset(); Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; + + // Clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; for(;;) { WDT_HIT(); @@ -1441,98 +1376,157 @@ static int EmGetCmd(uint8_t *received, int *len, int maxLen) analogAVG = 0; } } - // transmit none - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - } + // receive and test the miller decoding - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - if(MillerDecoding((b & 0xf0) >> 4)) { - *len = Uart.byteCnt; - if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE); - return 0; - } - if(MillerDecoding(b & 0x0f)) { - *len = Uart.byteCnt; - if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE); + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + if(MillerDecoding(b, 0)) { + *len = Uart.len; return 0; } - } + } + } } -static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded) -{ - int i, u = 0; - uint8_t b = 0; +static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, bool correctionNeeded) +{ + uint8_t b; + uint16_t i = 0; + uint32_t ThisTransferTime; + // Modulate Manchester FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); - AT91C_BASE_SSC->SSC_THR = 0x00; - FpgaSetupSsc(); - - // include correction bit - i = 1; - if((Uart.parityBits & 0x01) || correctionNeeded) { + + // include correction bit if necessary + if (Uart.parityBits & 0x01) { + correctionNeeded = TRUE; + } + if(correctionNeeded) { // 1236, so correction bit needed i = 0; + } else { + i = 1; } + + // clear receiving shift register and holding register + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + b = AT91C_BASE_SSC->SSC_RHR; (void) b; + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + b = AT91C_BASE_SSC->SSC_RHR; (void) b; + // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line) + for (uint16_t j = 0; j < 5; j++) { // allow timeout - better late than never + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + if (AT91C_BASE_SSC->SSC_RHR) break; + } + + while ((ThisTransferTime = GetCountSspClk()) & 0x00000007); + + // Clear TXRDY: + AT91C_BASE_SSC->SSC_THR = SEC_F; + // send cycle - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - (void)b; - } + for(; i <= respLen; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - if(i > respLen) { - b = 0xff; // was 0x00 - u++; - } else { - b = resp[i]; - i++; - } - AT91C_BASE_SSC->SSC_THR = b; - - if(u > 4) break; + AT91C_BASE_SSC->SSC_THR = resp[i++]; + FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; } + if(BUTTON_PRESS()) { break; } } + // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: + for (i = 0; i < 2 ; ) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + AT91C_BASE_SSC->SSC_THR = SEC_F; + FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + i++; + } + } + + LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0); + return 0; } -int EmSend4bitEx(uint8_t resp, int correctionNeeded){ - Code4bitAnswerAsTag(resp); +int EmSend4bitEx(uint8_t resp, bool correctionNeeded){ + Code4bitAnswerAsTag(resp); int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); - if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + &resp, + 1, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(&resp, 1), 1)); return res; } int EmSend4bit(uint8_t resp){ - return EmSend4bitEx(resp, 0); + return EmSend4bitEx(resp, false); } -int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){ - CodeIso14443aAsTagPar(resp, respLen, par); +int EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par){ + CodeIso14443aAsTagPar(resp, respLen, par); int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); - if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + resp, + respLen, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(resp, respLen), respLen)); return res; } -int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){ +int EmSendCmdEx(uint8_t *resp, int respLen, bool correctionNeeded){ return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen)); } int EmSendCmd(uint8_t *resp, int respLen){ - return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen)); + return EmSendCmdExPar(resp, respLen, false, GetParity(resp, respLen)); } int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){ - return EmSendCmdExPar(resp, respLen, 0, par); + return EmSendCmdExPar(resp, respLen, false, par); +} + +bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint32_t reader_Parity, + uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint32_t tag_Parity) +{ + if (tracing) { + // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from + // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp. + // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated: + uint16_t reader_modlen = reader_EndTime - reader_StartTime; + uint16_t approx_fdt = tag_StartTime - reader_EndTime; + uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20; + reader_EndTime = tag_StartTime - exact_fdt; + reader_StartTime = reader_EndTime - reader_modlen; + if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_Parity, TRUE)) { + return FALSE; + } else if (!LogTrace(NULL, 0, reader_EndTime, 0, TRUE)) { + return FALSE; + } else if (!LogTrace(tag_data, tag_len, tag_StartTime, tag_Parity, FALSE)) { + return FALSE; + } else { + return (!LogTrace(NULL, 0, tag_EndTime, 0, FALSE)); + } + } else { + return TRUE; + } } //----------------------------------------------------------------------------- @@ -1540,9 +1534,9 @@ int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){ // If a response is captured return TRUE // If it takes too long return FALSE //----------------------------------------------------------------------------- -static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, int maxLen, int *samples) +static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, int maxLen) { - int c; + uint16_t c; // Set FPGA mode to "reader listen mode", no modulation (listen // only, since we are receiving, not transmitting). @@ -1551,26 +1545,23 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); // Now get the answer from the card + DemodReset(); Demod.output = receivedResponse; - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; - - uint8_t b; + // clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + c = 0; for(;;) { WDT_HIT(); - // if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - // AT91C_BASE_SSC->SSC_THR = 0x00; // To make use of exact timing of next command from reader!! - // if (elapsed) (*elapsed)++; - // } if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - if(c < iso14a_timeout) { c++; } else { return FALSE; } b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - if(ManchesterDecoding(b, offset)) { - *samples = Demod.samples; + if(ManchesterDecoding(b, offset, 0)) { + NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD); return TRUE; + } else if(c++ > iso14a_timeout) { + return FALSE; } } } @@ -1579,15 +1570,18 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par, uint32_t *timing) { - CodeIso14443aBitsAsReaderPar(frame,bits,par); + CodeIso14443aBitsAsReaderPar(frame,bits,par); - // Send command to tag - TransmitFor14443a(ToSend, ToSendMax, timing); - if(trigger) - LED_A_ON(); + // Send command to tag + TransmitFor14443a(ToSend, ToSendMax, timing); + if(trigger) + LED_A_ON(); - // Log reader command in trace buffer - if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE); + // Log reader command in trace buffer + if (tracing) { + LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); + LogTrace(NULL, 0, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, 0, TRUE); + } } void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par, uint32_t *timing) @@ -1609,10 +1603,11 @@ void ReaderTransmit(uint8_t* frame, int len, uint32_t *timing) int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,offset,160,&samples)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); - if(samples == 0) return FALSE; + if (!GetIso14443aAnswerFromTag(receivedAnswer,offset,160)) return FALSE; + if (tracing) { + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.parityBits, FALSE); + LogTrace(NULL, 0, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, 0, FALSE); + } return Demod.len; } @@ -1623,11 +1618,12 @@ int ReaderReceive(uint8_t* receivedAnswer) int ReaderReceivePar(uint8_t *receivedAnswer, uint32_t *parptr) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,0,160,&samples)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); + if (!GetIso14443aAnswerFromTag(receivedAnswer,0,160)) return FALSE; + if (tracing) { + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.parityBits, FALSE); + LogTrace(NULL, 0, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, 0, FALSE); + } *parptr = Demod.parityBits; - if(samples == 0) return FALSE; return Demod.len; } @@ -1649,6 +1645,7 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u // Broadcast for a card, WUPA (0x52) will force response from all cards in the field ReaderTransmitBitsPar(wupa,7,0, NULL); + // Receive the ATQA if(!ReaderReceive(resp)) return 0; // Dbprintf("atqa: %02x %02x",resp[0],resp[1]); @@ -1707,7 +1704,7 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u 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]); + // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]); // calculate crypto UID. Always use last 4 Bytes. if(cuid_ptr) { @@ -1768,25 +1765,29 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u return 1; } -void iso14443a_setup() { +void iso14443a_setup(uint8_t fpga_minor_mode) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); // 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(50); - + // connect Demodulated Signal to ADC: SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - // Now give it time to spin up. // Signal field is on with the appropriate LED - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - SpinDelay(7); // iso14443-3 specifies 5ms max. + if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD + || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) { + LED_D_ON(); + } else { + LED_D_OFF(); + } + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode); - Demod.state = DEMOD_UNSYNCD; - iso14a_timeout = 2048; //default + // Start the timer + StartCountSspClk(); + + DemodReset(); + UartReset(); + NextTransferTime = 2*DELAY_ARM2AIR_AS_READER; + iso14a_set_timeout(1050); // 10ms default } int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { @@ -1820,10 +1821,10 @@ int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { // Read an ISO 14443a tag. Send out commands and store answers. // //----------------------------------------------------------------------------- -void ReaderIso14443a(UsbCommand * c) +void ReaderIso14443a(UsbCommand *c) { iso14a_command_t param = c->arg[0]; - uint8_t * cmd = c->d.asBytes; + uint8_t *cmd = c->d.asBytes; size_t len = c->arg[1]; size_t lenbits = c->arg[2]; uint32_t arg0 = 0; @@ -1833,14 +1834,14 @@ void ReaderIso14443a(UsbCommand * c) iso14a_clear_trace(); } - iso14a_set_tracing(true); + iso14a_set_tracing(TRUE); if(param & ISO14A_REQUEST_TRIGGER) { - iso14a_set_trigger(1); + iso14a_set_trigger(TRUE); } if(param & ISO14A_CONNECT) { - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); if(!(param & ISO14A_NO_SELECT)) { iso14a_card_select_t *card = (iso14a_card_select_t*)buf; arg0 = iso14443a_select_card(NULL,card,NULL); @@ -1852,10 +1853,6 @@ void ReaderIso14443a(UsbCommand * c) iso14a_timeout = c->arg[2]; } - if(param & ISO14A_SET_TIMEOUT) { - iso14a_timeout = c->arg[2]; - } - if(param & ISO14A_APDU) { arg0 = iso14_apdu(cmd, len, buf); cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); @@ -1865,6 +1862,7 @@ void ReaderIso14443a(UsbCommand * c) if(param & ISO14A_APPEND_CRC) { AppendCrc14443a(cmd,len); len += 2; + if (lenbits) lenbits += 16; } if(lenbits>0) { ReaderTransmitBitsPar(cmd,lenbits,GetParity(cmd,lenbits/8), NULL); @@ -1876,7 +1874,7 @@ void ReaderIso14443a(UsbCommand * c) } if(param & ISO14A_REQUEST_TRIGGER) { - iso14a_set_trigger(0); + iso14a_set_trigger(FALSE); } if(param & ISO14A_NO_DISCONNECT) { @@ -1926,8 +1924,9 @@ void ReaderMifare(bool first_try) static uint8_t mf_nr_ar3; uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + iso14a_clear_trace(); - tracing = false; + iso14a_set_tracing(TRUE); byte_t nt_diff = 0; byte_t par = 0; @@ -1952,11 +1951,9 @@ void ReaderMifare(bool first_try) if (first_try) { - StartCountMifare(); mf_nr_ar3 = 0; - iso14443a_setup(); - while((GetCountMifare() & 0xffff0000) != 0x10000); // wait for counter to reset and "warm up" - sync_time = GetCountMifare() & 0xfffffff8; + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); + sync_time = GetCountSspClk() & 0xfffffff8; sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). nt_attacked = 0; nt = 0; @@ -1974,7 +1971,7 @@ void ReaderMifare(bool first_try) LED_B_OFF(); LED_C_OFF(); - + for(uint16_t i = 0; TRUE; i++) { WDT_HIT(); @@ -1991,14 +1988,11 @@ void ReaderMifare(bool first_try) continue; } - //keep the card active - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; catch_up_cycles = 0; // if we missed the sync time already, advance to the next nonce repeat - while(GetCountMifare() > sync_time) { + while(GetCountSspClk() > sync_time) { sync_time = (sync_time & 0xfffffff8) + sync_cycles; } @@ -2092,9 +2086,6 @@ void ReaderMifare(bool first_try) } } - LogTrace((const uint8_t *)&nt, 4, 0, GetParity((const uint8_t *)&nt, 4), TRUE); - LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE); - LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE); mf_nr_ar[3] &= 0x1F; @@ -2110,7 +2101,8 @@ void ReaderMifare(bool first_try) // Thats it... FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); - tracing = TRUE; + + iso14a_set_tracing(FALSE); } /** @@ -2157,7 +2149,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; - + //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2 // This can be used in a reader-only attack. // (it can also be retrieved via 'hf 14a list', but hey... @@ -2165,31 +2157,27 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint8_t ar_nr_collected = 0; // clear trace - iso14a_clear_trace(); - - tracing = true; + iso14a_clear_trace(); + iso14a_set_tracing(TRUE); - // Authenticate response - nonce + // Authenticate response - nonce uint32_t nonce = bytes_to_num(rAUTH_NT, 4); - + //-- Determine the UID // Can be set from emulator memory, incoming data // and can be 7 or 4 bytes long - if(flags & FLAG_4B_UID_IN_DATA) + if (flags & FLAG_4B_UID_IN_DATA) { // 4B uid comes from data-portion of packet memcpy(rUIDBCC1,datain,4); rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - }else if(flags & FLAG_7B_UID_IN_DATA) - { + } else if (flags & FLAG_7B_UID_IN_DATA) { // 7B uid comes from data-portion of packet memcpy(&rUIDBCC1[1],datain,3); memcpy(rUIDBCC2, datain+3, 4); _7BUID = true; - } - else - { + } else { // get UID from emul memory emlGetMemBt(receivedCmd, 7, 1); _7BUID = !(receivedCmd[0] == 0x00); @@ -2200,40 +2188,34 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * emlGetMemBt(rUIDBCC2, 3, 4); } } + /* * Regardless of what method was used to set the UID, set fifth byte and modify * the ATQA for 4 or 7-byte UID */ - rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - if(_7BUID) - { + if (_7BUID) { rATQA[0] = 0x44; rUIDBCC1[0] = 0x88; rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; } - // start mkseconds counter - StartCountUS(); - // We need to listen to the high-frequency, peak-detected path. - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); - SpinDelay(200); if (MF_DBGLEVEL >= 1) { if (!_7BUID) { - Dbprintf("4B UID: %02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3]); - }else - { - Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3],rUIDBCC2[0],rUIDBCC2[1] ,rUIDBCC2[2] , rUIDBCC2[3]); + Dbprintf("4B UID: %02x%02x%02x%02x", + rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]); + } else { + Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x", + rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3], + rUIDBCC2[0], rUIDBCC2[1] ,rUIDBCC2[2], rUIDBCC2[3]); } } - // calibrate mkseconds counter - GetDeltaCountUS(); - bool finished = false; + + bool finished = FALSE; while (!BUTTON_PRESS() && !finished) { WDT_HIT(); @@ -2251,14 +2233,15 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * //Now, get data - res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout) + res = EmGetCmd(receivedCmd, &len); if (res == 2) { //Field is off! cardSTATE = MFEMUL_NOFIELD; LEDsoff(); continue; - }else if(res == 1) break;//return value 1 means button press - - + } else if (res == 1) { + break; //return value 1 means button press + } + // REQ or WUP request in ANY state and WUP in HALTED state if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) { selTimer = GetTickCount(); @@ -2272,11 +2255,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardAUTHKEY = 0xff; continue; } - + switch (cardSTATE) { case MFEMUL_NOFIELD: case MFEMUL_HALTED: case MFEMUL_IDLE:{ + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } case MFEMUL_SELECT1:{ @@ -2294,12 +2279,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // select card if (len == 9 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) { - - if (!_7BUID) - EmSendCmd(rSAK, sizeof(rSAK)); - else - EmSendCmd(rSAK1, sizeof(rSAK1)); - + EmSendCmd(_7BUID?rSAK1:rSAK, _7BUID?sizeof(rSAK1):sizeof(rSAK)); cuid = bytes_to_num(rUIDBCC1, 4); if (!_7BUID) { cardSTATE = MFEMUL_WORK; @@ -2308,16 +2288,16 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } else { cardSTATE = MFEMUL_SELECT2; - break; } } - break; } case MFEMUL_AUTH1:{ if( len != 8) { cardSTATE_TO_IDLE(); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } uint32_t ar = bytes_to_num(receivedCmd, 4); @@ -2325,13 +2305,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * //Collect AR/NR if(ar_nr_collected < 2){ - if(ar_nr_responses[ar_nr_collected*4+2] != ar) - {// Avoid duplicates - ar_nr_collected++; + if(ar_nr_responses[2] != ar) + {// Avoid duplicates... probably not necessary, ar should vary. ar_nr_responses[ar_nr_collected*4] = cuid; ar_nr_responses[ar_nr_collected*4+1] = nonce; ar_nr_responses[ar_nr_collected*4+2] = ar; ar_nr_responses[ar_nr_collected*4+3] = nr; + ar_nr_collected++; } } @@ -2341,11 +2321,16 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // test if auth OK if (cardRr != prng_successor(nonce, 64)){ - if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x",cardRr, prng_successor(nonce, 64)); - //Shouldn't we respond anything here? + if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x", + cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', + cardRr, prng_successor(nonce, 64)); + // Shouldn't we respond anything here? // Right now, we don't nack or anything, which causes the // reader to do a WUPA after a while. /Martin + // -- which is the correct response. /piwi cardSTATE_TO_IDLE(); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } @@ -2356,12 +2341,17 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); LED_C_ON(); cardSTATE = MFEMUL_WORK; - if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED. sector=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer); + if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c. time=%d", + cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', + GetTickCount() - authTimer); break; } case MFEMUL_SELECT2:{ - if (!len) break; - + if (!len) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) { EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2)); break; @@ -2371,7 +2361,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (len == 9 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) { EmSendCmd(rSAK, sizeof(rSAK)); - cuid = bytes_to_num(rUIDBCC2, 4); cardSTATE = MFEMUL_WORK; LED_B_ON(); @@ -2380,22 +2369,30 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } // i guess there is a command). go into the work state. - if (len != 4) break; + if (len != 4) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } cardSTATE = MFEMUL_WORK; //goto lbWORK; //intentional fall-through to the next case-stmt } - case MFEMUL_WORK:{ - if (len == 0) break; + case MFEMUL_WORK:{ + if (len == 0) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } + bool encrypted_data = (cardAUTHKEY != 0xFF) ; - if(encrypted_data) - { + if(encrypted_data) { // decrypt seqence mf_crypto1_decrypt(pcs, receivedCmd, len); } - + if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { authTimer = GetTickCount(); cardAUTHSC = receivedCmd[1] / 4; // received block num @@ -2404,14 +2401,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); if (!encrypted_data) { // first authentication - if (MF_DBGLEVEL >= 2) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); + if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce - } - else{ // nested authentication - if (MF_DBGLEVEL >= 2) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); - ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); + } else { // nested authentication + if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); + ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); num_to_bytes(ans, 4, rAUTH_AT); } EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); @@ -2419,7 +2415,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE = MFEMUL_AUTH1; break; } - + // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued // BUT... ACK --> NACK if (len == 1 && receivedCmd[0] == CARD_ACK) { @@ -2433,25 +2429,25 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } - if(len != 4) break; + if(len != 4) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } if(receivedCmd[0] == 0x30 // read block || receivedCmd[0] == 0xA0 // write block - || receivedCmd[0] == 0xC0 - || receivedCmd[0] == 0xC1 - || receivedCmd[0] == 0xC2 // inc dec restore - || receivedCmd[0] == 0xB0) // transfer - { - if (receivedCmd[1] >= 16 * 4) - { - + || receivedCmd[0] == 0xC0 // inc + || receivedCmd[0] == 0xC1 // dec + || receivedCmd[0] == 0xC2 // restore + || receivedCmd[0] == 0xB0) { // transfer + if (receivedCmd[1] >= 16 * 4) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); break; } - if (receivedCmd[1] / 4 != cardAUTHSC) - { + if (receivedCmd[1] / 4 != cardAUTHSC) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); break; @@ -2459,7 +2455,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } // read block if (receivedCmd[0] == 0x30) { - if (MF_DBGLEVEL >= 2) { + if (MF_DBGLEVEL >= 4) { Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]); } emlGetMem(response, receivedCmd[1], 1); @@ -2467,8 +2463,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * mf_crypto1_encrypt(pcs, response, 18, &par); EmSendCmdPar(response, 18, par); numReads++; - if(exitAfterNReads > 0 && numReads == exitAfterNReads) - { + if(exitAfterNReads > 0 && numReads == exitAfterNReads) { Dbprintf("%d reads done, exiting", numReads); finished = true; } @@ -2476,18 +2471,15 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } // write block if (receivedCmd[0] == 0xA0) { - if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]); - + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - //nextCycleTimeout = 50; cardSTATE = MFEMUL_WRITEBL2; cardWRBL = receivedCmd[1]; break; - } + } // increment, decrement, restore if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) { - if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); - + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); if (emlCheckValBl(receivedCmd[1])) { if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); @@ -2501,28 +2493,25 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (receivedCmd[0] == 0xC2) cardSTATE = MFEMUL_INTREG_REST; cardWRBL = receivedCmd[1]; - break; } - // transfer if (receivedCmd[0] == 0xB0) { - if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); - + if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1])) EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); else EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - break; } - // halt if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) { LED_B_OFF(); LED_C_OFF(); cardSTATE = MFEMUL_HALTED; if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } // RATS @@ -2530,12 +2519,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); break; } - // command not allowed if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking"); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - - // case break break; } case MFEMUL_WRITEBL2:{ @@ -2544,10 +2530,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * emlSetMem(receivedCmd, cardWRBL, 1); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); cardSTATE = MFEMUL_WORK; - break; } else { cardSTATE_TO_IDLE(); - break; + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); } break; } @@ -2559,7 +2545,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); cardSTATE_TO_IDLE(); break; - } + } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardINTREG = cardINTREG + ans; cardSTATE = MFEMUL_WORK; break; @@ -2572,6 +2560,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE_TO_IDLE(); break; } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardINTREG = cardINTREG - ans; cardSTATE = MFEMUL_WORK; break; @@ -2584,6 +2574,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE_TO_IDLE(); break; } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardSTATE = MFEMUL_WORK; break; } @@ -2593,20 +2585,17 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); - // add trace trailer - memset(rAUTH_NT, 0x44, 4); - LogTrace(rAUTH_NT, 4, 0, 0, TRUE); if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK { //May just aswell send the collected ar_nr in the response aswell cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,0,0,&ar_nr_responses,ar_nr_collected*4*4); } + if(flags & FLAG_NR_AR_ATTACK) { - if(ar_nr_collected > 1) - { + if(ar_nr_collected > 1) { Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); - Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x", + Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x", ar_nr_responses[0], // UID ar_nr_responses[1], //NT ar_nr_responses[2], //AR1 @@ -2614,12 +2603,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * ar_nr_responses[6], //AR2 ar_nr_responses[7] //NR2 ); - }else - { + } else { Dbprintf("Failed to obtain two AR/NR pairs!"); - if(ar_nr_collected >0) - { - Dbprintf("Only got these: UID=%08d, nonce=%08d, AR1=%08d, NR1=%08d", + if(ar_nr_collected >0) { + Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x", ar_nr_responses[0], // UID ar_nr_responses[1], //NT ar_nr_responses[2], //AR1 @@ -2645,7 +2632,8 @@ void RAMFUNC SniffMifare(uint8_t param) { // C(red) A(yellow) B(green) LEDsoff(); // init trace buffer - iso14a_clear_trace(); + iso14a_clear_trace(); + iso14a_set_tracing(TRUE); // The command (reader -> tag) that we're receiving. // The length of a received command will in most cases be no more than 18 bytes. @@ -2659,71 +2647,73 @@ void RAMFUNC SniffMifare(uint8_t param) { //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; + uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + uint8_t *data = dmaBuf; + uint8_t previous_data = 0; int maxDataLen = 0; int dataLen = 0; + bool ReaderIsActive = FALSE; + bool TagIsActive = FALSE; + + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); // 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); + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. - // 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) { + for(uint32_t sniffCounter = 0; TRUE; ) { + if(BUTTON_PRESS()) { DbpString("cancelled by button"); - goto done; + break; } LED_A_ON(); WDT_HIT(); - if (++sniffCounter > 65) { - if (MfSniffSend(2000)) { - FpgaEnableSscDma(); + if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time + // check if a transaction is completed (timeout after 2000ms). + // if yes, stop the DMA transfer and send what we have so far to the client + if (MfSniffSend(2000)) { + // Reset everything - we missed some sniffed data anyway while the DMA was stopped + sniffCounter = 0; + data = dmaBuf; + maxDataLen = 0; + ReaderIsActive = FALSE; + TagIsActive = FALSE; + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. } - 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; + + int register readBufDataP = data - dmaBuf; // number of bytes we have processed so far + int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; // number of bytes already transferred + if (readBufDataP <= dmaBufDataP){ // we are processing the same block of data which is currently being transferred + dataLen = dmaBufDataP - readBufDataP; // number of bytes still to be processed + } else { + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; // number of bytes still to be processed } // test for length of buffer - if(dataLen > maxDataLen) { - maxDataLen = dataLen; + if(dataLen > maxDataLen) { // we are more behind than ever... + maxDataLen = dataLen; if(dataLen > 400) { Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); - goto done; + break; } } if(dataLen < 1) continue; - // primary buffer was stopped( <-- we lost data! + // 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; @@ -2737,44 +2727,51 @@ void RAMFUNC SniffMifare(uint8_t param) { 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 (sniffCounter & 0x01) { - if(ManchesterDecoding(data[0], 0)) { - LED_C_INV(); + if(!TagIsActive) { // no need to try decoding tag data if the reader is sending + uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); + if(MillerDecoding(readerdata, (sniffCounter-1)*4)) { + LED_C_INV(); + if (MfSniffLogic(receivedCmd, Uart.len, Uart.parityBits, Uart.bitCount, TRUE)) break; - if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; + /* And ready to receive another command. */ + UartReset(); + + /* And also reset the demod code */ + DemodReset(); + } + ReaderIsActive = (Uart.state != STATE_UNSYNCD); + } + + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending + uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); + if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) { + LED_C_INV(); - // And ready to receive another response. - memset(&Demod, 0, sizeof(Demod)); - Demod.output = receivedResponse; - Demod.state = DEMOD_UNSYNCD; + if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; - /* And also reset the uart code */ - Uart.state = STATE_UNSYNCD; + // And ready to receive another response. + DemodReset(); + } + TagIsActive = (Demod.state != DEMOD_UNSYNCD); + } } + previous_data = *data; + sniffCounter++; data++; - if(data > dmaBuf + DMA_BUFFER_SIZE) { + 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); + Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len); LEDsoff(); }