X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6c38d4c96fa96c871c739718081caa5e56ce968a..6cf8fcb002d57d243cb2f13c0fae35212ae3641f:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 8dbe9e81..c4298fcb 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -750,7 +750,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *par static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) { - uint8_t par[MAX_PARITY_SIZE]; + uint8_t par[MAX_PARITY_SIZE] = {0}; GetParity(cmd, len, par); CodeIso14443aAsTagPar(cmd, len, par); @@ -1428,24 +1428,26 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) // of bits specified in the delay parameter. void PrepareDelayedTransfer(uint16_t delay) { + delay &= 0x07; + if (!delay) return; + uint8_t bitmask = 0; uint8_t bits_to_shift = 0; uint8_t bits_shifted = 0; + uint16_t i = 0; + + for (i = 0; i < delay; ++i) + bitmask |= (0x01 << i); - delay &= 0x07; - if (delay) { - for (uint16_t i = 0; i < delay; i++) { - bitmask |= (0x01 << i); - } ToSend[++ToSendMax] = 0x00; - for (uint16_t i = 0; i < ToSendMax; i++) { + + for (i = 0; i < ToSendMax; ++i) { bits_to_shift = ToSend[i] & bitmask; ToSend[i] = ToSend[i] >> delay; ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay)); bits_shifted = bits_to_shift; } } -} //------------------------------------------------------------------------------------- @@ -1463,18 +1465,27 @@ static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing uint32_t ThisTransferTime = 0; if (timing) { - if(*timing == 0) { // Measure time + + if (*timing != 0) + // Delay transfer (fine tuning - up to 7 MF clock ticks) + PrepareDelayedTransfer(*timing & 0x00000007); + else + // Measure time *timing = (GetCountSspClk() + 8) & 0xfffffff8; - } else { - PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) - } - if(MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); + - while(GetCountSspClk() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) + if (MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) + Dbprintf("TransmitFor14443a: Missed timing"); + + // Delay transfer (multiple of 8 MF clock ticks) + while (GetCountSspClk() < (*timing & 0xfffffff8)); + LastTimeProxToAirStart = *timing; } else { ThisTransferTime = ((MAX(NextTransferTime, GetCountSspClk()) & 0xfffffff8) + 8); + while(GetCountSspClk() < ThisTransferTime); + LastTimeProxToAirStart = ThisTransferTime; } @@ -1572,7 +1583,7 @@ void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8 ToSend[++ToSendMax] = SEC_Y; // Convert to length of command: - ToSendMax++; + ++ToSendMax; } //----------------------------------------------------------------------------- @@ -1580,7 +1591,8 @@ void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8 //----------------------------------------------------------------------------- void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity) { - CodeIso14443aBitsAsReaderPar(cmd, len*8, parity); + //CodeIso14443aBitsAsReaderPar(cmd, len*8, parity); + CodeIso14443aBitsAsReaderPar(cmd, len<<3, parity); } @@ -1703,7 +1715,7 @@ static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNe } // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: - uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3; + uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3; // twich /8 ?? >>3, for (i = 0; i <= fpga_queued_bits/8 + 1; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = SEC_F; @@ -1838,19 +1850,22 @@ void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t LED_A_ON(); // Log reader command in trace buffer - LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); + //LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); + LogTrace(frame, nbytes(bits), (LastTimeProxToAirStart<<4) + DELAY_ARM2AIR_AS_READER, ((LastTimeProxToAirStart + LastProxToAirDuration)<<4) + DELAY_ARM2AIR_AS_READER, par, TRUE); } void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing) { - ReaderTransmitBitsPar(frame, len*8, par, timing); + //ReaderTransmitBitsPar(frame, len*8, par, timing); + ReaderTransmitBitsPar(frame, len<<3, par, timing); } void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing) { // Generate parity and redirect uint8_t par[MAX_PARITY_SIZE] = {0x00}; - GetParity(frame, len/8, par); + //GetParity(frame, len/8, par); + GetParity(frame, len >> 3, par); ReaderTransmitBitsPar(frame, len, par, timing); } @@ -1859,7 +1874,8 @@ void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) // Generate parity and redirect uint8_t par[MAX_PARITY_SIZE] = {0x00}; GetParity(frame, len, par); - ReaderTransmitBitsPar(frame, len*8, par, timing); + //ReaderTransmitBitsPar(frame, len*8, par, timing); + ReaderTransmitBitsPar(frame, len<<3, par, timing); } int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) @@ -1867,7 +1883,8 @@ int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parit if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE; - LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); + //LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); + LogTrace(receivedAnswer, Demod.len, (Demod.startTime<<4) - DELAY_AIR2ARM_AS_READER, (Demod.endTime<<4) - DELAY_AIR2ARM_AS_READER, parity, FALSE); return Demod.len; } @@ -1876,7 +1893,8 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE; - LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); + //LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); + LogTrace(receivedAnswer, Demod.len, (Demod.startTime<<4) - DELAY_AIR2ARM_AS_READER, (Demod.endTime<<4) - DELAY_AIR2ARM_AS_READER, parity, FALSE); return Demod.len; } @@ -2189,17 +2207,63 @@ void ReaderIso14443a(UsbCommand *c) int32_t dist_nt(uint32_t nt1, uint32_t nt2) { if (nt1 == nt2) return 0; - + uint16_t i; uint32_t nttmp1 = nt1; uint32_t nttmp2 = nt2; - for (i = 1; i < 0xFFFF; ++i) { - nttmp1 = prng_successor(nttmp1, 1); - if (nttmp1 == nt2) return i; + for (i = 1; i < 0xFFFF; i += 8) { + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+1; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+1; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+2; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+2; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+3; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+3; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+4; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+4; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+5; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+5; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+6; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+6; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+7; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+7; + + nttmp1 = prng_successor_one(nttmp1); if (nttmp1 == nt2) return i+8; + nttmp2 = prng_successor_one(nttmp2); if (nttmp2 == nt1) return -i+8; +/* + if ( prng_successor(nttmp1, i) == nt2) return i; + if ( prng_successor(nttmp2, i) == nt1) return -i; + + if ( prng_successor(nttmp1, i+2) == nt2) return i+2; + if ( prng_successor(nttmp2, i+2) == nt1) return -(i+2); + + if ( prng_successor(nttmp1, i+3) == nt2) return i+3; + if ( prng_successor(nttmp2, i+3) == nt1) return -(i+3); + + if ( prng_successor(nttmp1, i+4) == nt2) return i+4; + if ( prng_successor(nttmp2, i+4) == nt1) return -(i+4); + + if ( prng_successor(nttmp1, i+5) == nt2) return i+5; + if ( prng_successor(nttmp2, i+5) == nt1) return -(i+5); + + if ( prng_successor(nttmp1, i+6) == nt2) return i+6; + if ( prng_successor(nttmp2, i+6) == nt1) return -(i+6); + + if ( prng_successor(nttmp1, i+7) == nt2) return i+7; + if ( prng_successor(nttmp2, i+7) == nt1) return -(i+7); - nttmp2 = prng_successor(nttmp2, 1); - if (nttmp2 == nt1) return -i; + if ( prng_successor(nttmp1, i+8) == nt2) return i+8; + if ( prng_successor(nttmp2, i+8) == nt1) return -(i+8); +*/ } return(-99999); // either nt1 or nt2 are invalid nonces @@ -2230,9 +2294,8 @@ void ReaderMifare(bool first_try, uint8_t block ) byte_t nt_diff = 0; uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough static byte_t par_low = 0; - bool led_on = TRUE; uint8_t uid[10] = {0}; - uint32_t cuid = 0; + //uint32_t cuid = 0; uint32_t nt = 0; uint32_t previous_nt = 0; @@ -2256,17 +2319,11 @@ void ReaderMifare(bool first_try, uint8_t block ) uint16_t unexpected_random = 0; uint16_t sync_tries = 0; - int16_t debug_info_nr = -1; uint16_t strategy = 0; - int32_t debug_info[MAX_STRATEGY+1][NUM_DEBUG_INFOS]; - uint32_t select_time = 0; uint32_t halt_time = 0; - //uint8_t caller[7] = {0}; - // init to zero. - for (uint16_t i = 0; i < MAX_STRATEGY+1; ++i) - for(uint16_t j = 0; j < NUM_DEBUG_INFOS; ++j) - debug_info[i][j] = 0; + clear_trace(); + set_tracing(TRUE); LED_A_ON(); LED_B_OFF(); @@ -2277,8 +2334,6 @@ void ReaderMifare(bool first_try, uint8_t block ) // free eventually allocated BigBuf memory. We want all for tracing. BigBuf_free(); - clear_trace(); - set_tracing(TRUE); if (first_try) { sync_time = GetCountSspClk() & 0xfffffff8; @@ -2310,7 +2365,7 @@ void ReaderMifare(bool first_try, uint8_t block ) int len = mifare_sendcmd_short(NULL, false, 0x50, 0x00, receivedAnswer, receivedAnswerPar, &halt_time); if (len && MF_DBGLEVEL >= 3) - Dbprintf("Unexpected response of %d bytes to halt command (additional debugging).\n", len); + Dbprintf("Unexpected response of %d bytes to halt command.", len); } if (strategy == 3) { @@ -2323,61 +2378,32 @@ void ReaderMifare(bool first_try, uint8_t block ) WDT_HIT(); } - if (!iso14443a_select_card(uid, NULL, &cuid, true, 0)) { + if (!iso14443a_select_card(uid, NULL, NULL, true, 0)) { if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card\n"); continue; } - - select_time = GetCountSspClk() & 0xfffffff8; - elapsed_prng_sequences = 1; - if (debug_info_nr == -1) { - - 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 - WDT_HIT(); - while(GetCountSspClk() > sync_time) { - ++elapsed_prng_sequences; - sync_time = (sync_time & 0xfffffff8) + sync_cycles; - //sync_time += sync_cycles; - //sync_time &= 0xfffffff8; - } - WDT_HIT(); - // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) - ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); - if (MF_DBGLEVEL == 2) Dbprintf("sync_time %d \n", sync_time); - - } else { - // collect some information on tag nonces for debugging: - #define DEBUG_FIXED_SYNC_CYCLES PRNG_SEQUENCE_LENGTH - if (strategy == 0) { - // nonce distances at fixed time after card select: - sync_time = select_time + DEBUG_FIXED_SYNC_CYCLES; - } else if (strategy == 1) { - // nonce distances at fixed time between authentications: - sync_time = sync_time + DEBUG_FIXED_SYNC_CYCLES; - } else if (strategy == 2) { - // nonce distances at fixed time after halt: - sync_time = halt_time + DEBUG_FIXED_SYNC_CYCLES; - } else { - // nonce_distances at fixed time after power on - sync_time = DEBUG_FIXED_SYNC_CYCLES; - } - ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); - } + 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(GetCountSspClk() > sync_time) { + ++elapsed_prng_sequences; + sync_time += sync_cycles; + } + // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) + ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); // Receive the (4 Byte) "random" nonce if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) continue; - previous_nt = nt; - nt = bytes_to_num(receivedAnswer, 4); - // Transmit reader nonce with fake par ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL); + previous_nt = nt; + nt = bytes_to_num(receivedAnswer, 4); + if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet int nt_distance = dist_nt(previous_nt, nt); if (nt_distance == 0) { @@ -2397,22 +2423,16 @@ void ReaderMifare(bool first_try, uint8_t block ) if (strategy > MAX_STRATEGY || MF_DBGLEVEL < 3) { isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly break; - } else { // continue for a while, just to collect some debug info - ++debug_info_nr; - debug_info[strategy][debug_info_nr] = nt_distance; - if (debug_info_nr == NUM_DEBUG_INFOS-1) { - ++strategy; - debug_info_nr = 0; - } + } else { continue; } } - sync_cycles = (sync_cycles - nt_distance/elapsed_prng_sequences); + sync_cycles = (sync_cycles - nt_distance)/elapsed_prng_sequences; if (sync_cycles <= 0) sync_cycles += PRNG_SEQUENCE_LENGTH; - if (MF_DBGLEVEL >= 2) + if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, elapsed_prng_sequences=%d, new sync_cycles: %d\n", i, nt_distance, elapsed_prng_sequences, sync_cycles); continue; @@ -2435,8 +2455,7 @@ void ReaderMifare(bool first_try, uint8_t block ) } else { last_catch_up = catch_up_cycles; consecutive_resyncs = 0; - } - sync_cycles += catch_up_cycles; + } if (consecutive_resyncs < 3) { if (MF_DBGLEVEL >= 3) @@ -2454,8 +2473,6 @@ void ReaderMifare(bool first_try, uint8_t block ) continue; } - consecutive_resyncs = 0; - // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding if (ReaderReceive(receivedAnswer, receivedAnswerPar)) { catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer @@ -2463,9 +2480,6 @@ void ReaderMifare(bool first_try, uint8_t block ) if (nt_diff == 0) par_low = par[0] & 0xE0; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change - led_on = !led_on; - if(led_on) LED_B_ON(); else LED_B_OFF(); - par_list[nt_diff] = SwapBits(par[0], 8); ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; @@ -2478,6 +2492,7 @@ void ReaderMifare(bool first_try, uint8_t block ) nt_diff = (nt_diff + 1) & 0x07; mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5); par[0] = par_low; + } else { if (nt_diff == 0 && first_try) { par[0]++; @@ -2489,17 +2504,13 @@ void ReaderMifare(bool first_try, uint8_t block ) par[0] = ((par[0] & 0x1F) + 1) | par_low; } } + + consecutive_resyncs = 0; } mf_nr_ar[3] &= 0x1F; WDT_HIT(); - - if (isOK == -4) { - for (uint16_t i = 0; i < MAX_STRATEGY+1; ++i) - for(uint16_t j = 0; j < NUM_DEBUG_INFOS; ++j) - Dbprintf("info[%d][%d] = %d", i, j, debug_info[i][j]); - } // reset sync_time. if ( isOK == 1) {