X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/4b78d6b317923ae9fc7b4739c4c12edb48cb71da..45293f1096a2fae3fbdad5f90248929cd9c6f562:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index c7fc06ec..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 |= (1 << 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; } @@ -2197,33 +2208,62 @@ 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 (uint16_t i = 1; i < 0xFFFF; i += 8) { - nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i; - nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -i; - - nttmp1 = prng_successor(nttmp1, 2); if (nttmp1 == nt2) return i+1; - nttmp2 = prng_successor(nttmp2, 2); if (nttmp2 == nt1) return -i-1; - - nttmp1 = prng_successor(nttmp1, 3); if (nttmp1 == nt2) return i+2; - nttmp2 = prng_successor(nttmp2, 3); if (nttmp2 == nt1) return -i-2; - - nttmp1 = prng_successor(nttmp1, 4); if (nttmp1 == nt2) return i+3; - nttmp2 = prng_successor(nttmp2, 4); if (nttmp2 == nt1) return -i-3; + 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(nttmp1, 5); if (nttmp1 == nt2) return i+4; - nttmp2 = prng_successor(nttmp2, 5); if (nttmp2 == nt1) return -i-4; - - nttmp1 = prng_successor(nttmp1, 6); if (nttmp1 == nt2) return i+5; - nttmp2 = prng_successor(nttmp2, 6); if (nttmp2 == nt1) return -i-5; - - nttmp1 = prng_successor(nttmp1, 7); if (nttmp1 == nt2) return i+6; - nttmp2 = prng_successor(nttmp2, 7); if (nttmp2 == nt1) return -i-6; - - nttmp1 = prng_successor(nttmp1, 8); if (nttmp1 == nt2) return i+7; - nttmp2 = prng_successor(nttmp2, 8); if (nttmp2 == nt1) return -i-7; + 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); + + 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 @@ -2349,7 +2389,7 @@ void ReaderMifare(bool first_try, uint8_t block ) // if we missed the sync time already, advance to the next nonce repeat while(GetCountSspClk() > sync_time) { ++elapsed_prng_sequences; - sync_time = (sync_time & 0xfffffff8) + sync_cycles; + 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);