X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/10403a6a3005f81839603dcb415ee352f939c06b..e57fe796f529d3edd7d48f1fa51676e809531280:/armsrc/iso14443a.c?ds=sidebyside diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 3c5c9c24..b1639a88 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -10,20 +10,19 @@ // Routines to support ISO 14443 type A. //----------------------------------------------------------------------------- -#include "../include/proxmark3.h" +#include "proxmark3.h" #include "apps.h" #include "util.h" #include "string.h" -#include "../common/cmd.h" -#include "../common/iso14443crc.h" +#include "cmd.h" + +#include "iso14443crc.h" #include "iso14443a.h" #include "crapto1.h" #include "mifareutil.h" static uint32_t iso14a_timeout; -uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET; int rsamples = 0; -int traceLen = 0; int tracing = TRUE; uint8_t trigger = 0; // the block number for the ISO14443-4 PCB @@ -148,7 +147,9 @@ void iso14a_set_trigger(bool enable) { } void iso14a_clear_trace() { - memset(trace, 0x44, TRACE_SIZE); + uint8_t *trace = BigBuf_get_addr(); + uint16_t max_traceLen = BigBuf_max_traceLen(); + memset(trace, 0x44, max_traceLen); traceLen = 0; } @@ -169,7 +170,7 @@ byte_t oddparity (const byte_t bt) return OddByteParity[bt]; } -void GetParity(const uint8_t * pbtCmd, uint16_t iLen, uint8_t *par) +void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par) { uint16_t paritybit_cnt = 0; uint16_t paritybyte_cnt = 0; @@ -179,15 +180,15 @@ void GetParity(const uint8_t * pbtCmd, uint16_t iLen, uint8_t *par) // Generate the parity bits parityBits |= ((OddByteParity[pbtCmd[i]]) << (7-paritybit_cnt)); if (paritybit_cnt == 7) { - par[paritybyte_cnt] = parityBits; // save 8 Bits parity - parityBits = 0; // and advance to next Parity Byte + par[paritybyte_cnt] = parityBits; // save 8 Bits parity + parityBits = 0; // and advance to next Parity Byte paritybyte_cnt++; paritybit_cnt = 0; } else { - paritybit_cnt++; + paritybit_cnt++; } } - + // save remaining parity bits par[paritybyte_cnt] = parityBits; @@ -203,11 +204,13 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_ { if (!tracing) return FALSE; - uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity + uint8_t *trace = BigBuf_get_addr(); + uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity uint16_t duration = timestamp_end - timestamp_start; // Return when trace is full - if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= TRACE_SIZE) { + uint16_t max_traceLen = BigBuf_max_traceLen(); + if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) { tracing = FALSE; // don't trace any more return FALSE; } @@ -218,7 +221,7 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_ // 16 bits data length (little endian, Highest Bit used as readerToTag flag) // y Bytes data // x Bytes parity (one byte per 8 bytes data) - + // timestamp (start) trace[traceLen++] = ((timestamp_start >> 0) & 0xff); trace[traceLen++] = ((timestamp_start >> 8) & 0xff); @@ -228,28 +231,28 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_ // duration trace[traceLen++] = ((duration >> 0) & 0xff); trace[traceLen++] = ((duration >> 8) & 0xff); - + // data length trace[traceLen++] = ((iLen >> 0) & 0xff); trace[traceLen++] = ((iLen >> 8) & 0xff); - + // readerToTag flag if (!readerToTag) { trace[traceLen - 1] |= 0x80; - } + } // data bytes if (btBytes != NULL && iLen != 0) { memcpy(trace + traceLen, btBytes, iLen); } - traceLen += iLen; - + traceLen += iLen; + // parity bytes if (parity != NULL && iLen != 0) { memcpy(trace + traceLen, parity, num_paritybytes); } traceLen += num_paritybytes; - + return TRUE; } @@ -307,7 +310,7 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) Uart.twoBits = (Uart.twoBits << 8) | bit; - if (Uart.state == STATE_UNSYNCD) { // not yet synced + if (Uart.state == STATE_UNSYNCD) { // not yet synced if (Uart.highCnt < 7) { // wait for a stable unmodulated signal if (Uart.twoBits == 0xffff) { @@ -315,7 +318,7 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) } else { Uart.highCnt = 0; } - } else { + } else { Uart.syncBit = 0xFFFF; // not set // look for 00xx1111 (the start bit) if ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; @@ -355,9 +358,9 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit Uart.bitCount = 0; Uart.shiftReg = 0; - if((Uart.len & 0x0007) == 0) { // every 8 data bytes - Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits - Uart.parityBits = 0; + if((Uart.len&0x0007) == 0) { // every 8 data bytes + Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits + Uart.parityBits = 0; } } } @@ -374,32 +377,32 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit Uart.bitCount = 0; Uart.shiftReg = 0; - if ((Uart.len & 0x0007) == 0) { // every 8 data bytes - Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits + if ((Uart.len&0x0007) == 0) { // every 8 data bytes + Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits Uart.parityBits = 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; - Uart.bitCount--; // last "0" was part of EOC sequence - Uart.shiftReg <<= 1; // drop it - if(Uart.bitCount > 0) { // if we decoded some bits - Uart.shiftReg >>= (9 - Uart.bitCount); // right align them - Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output - Uart.parityBits <<= 1; // add a (void) parity bit - Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align parity bits - Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it - return TRUE; - } else if (Uart.len & 0x0007) { // there are some parity bits to store - Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align remaining parity bits - Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them + Uart.bitCount--; // last "0" was part of EOC sequence + Uart.shiftReg <<= 1; // drop it + if(Uart.bitCount > 0) { // if we decoded some bits + Uart.shiftReg >>= (9 - Uart.bitCount); // right align them + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output + Uart.parityBits <<= 1; // add a (void) parity bit + Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align parity bits + Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it + return TRUE; + } else if (Uart.len & 0x0007) { // there are some parity bits to store + Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align remaining parity bits + Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them } - if ( Uart.len) { - return TRUE; // we are finished with decoding the raw data sequence + if (Uart.len) { + return TRUE; // we are finished with decoding the raw data sequence } else { UartReset(); // Nothing receiver - start over - } + } } if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC UartReset(); @@ -414,8 +417,8 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit Uart.bitCount = 0; Uart.shiftReg = 0; - if ((Uart.len & 0x0007) == 0) { // every 8 data bytes - Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits + if ((Uart.len&0x0007) == 0) { // every 8 data bytes + Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits Uart.parityBits = 0; } } @@ -423,7 +426,7 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) } } - } + } return FALSE; // not finished yet, need more data } @@ -527,8 +530,8 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; - if((Demod.len & 0x0007) == 0) { // every 8 data bytes - Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits + if((Demod.len&0x0007) == 0) { // every 8 data bytes + Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits Demod.parityBits = 0; } } @@ -543,26 +546,26 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; - if ((Demod.len & 0x0007) == 0) { // every 8 data bytes - Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1 + if ((Demod.len&0x0007) == 0) { // every 8 data bytes + Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1 Demod.parityBits = 0; } } Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1); } else { // no modulation in both halves - End of communication - if(Demod.bitCount > 0) { // there are some remaining data bits - Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits - Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output - Demod.parityBits <<= 1; // add a (void) parity bit - Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits - Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them - return TRUE; - } else if (Demod.len & 0x0007) { // there are some parity bits to store - Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits - Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them - } - if (Demod.len) { - return TRUE; // we are finished with decoding the raw data sequence + if(Demod.bitCount > 0) { // there are some remaining data bits + Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits + Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output + Demod.parityBits <<= 1; // add a (void) parity bit + Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits + Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them + return TRUE; + } else if (Demod.len & 0x0007) { // there are some parity bits to store + Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits + Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them + } + if (Demod.len) { + return TRUE; // we are finished with decoding the raw data sequence } else { // nothing received. Start over DemodReset(); } @@ -590,9 +593,6 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // bit 1 - trigger from first reader 7-bit request 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 @@ -600,22 +600,25 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // triggered == FALSE -- to wait first for card bool triggered = !(param & 0x03); + // Allocate memory from BigBuf for some buffers + // free all previous allocations first + BigBuf_free(); + // The command (reader -> tag) that we're receiving. - // The length of a received command will in most cases be no more than 18 bytes. - // So 32 should be enough! - uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET; - uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET; + uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); + uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE); // The response (tag -> reader) that we're receiving. - uint8_t *receivedResponse = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET; - uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; - - // As we receive stuff, we copy it from receivedCmd or receivedResponse - // into trace, along with its length and other annotations. - //uint8_t *trace = (uint8_t *)BigBuf; + uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE); + uint8_t *receivedResponsePar = BigBuf_malloc(MAX_PARITY_SIZE); // The DMA buffer, used to stream samples from the FPGA - uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); + + // init trace buffer + iso14a_clear_trace(); + iso14a_set_tracing(TRUE); + uint8_t *data = dmaBuf; uint8_t previous_data = 0; int maxDataLen = 0; @@ -627,10 +630,10 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse, receivedResponsePar); - + // Set up the demodulator for the reader -> tag commands UartInit(receivedCmd, receivedCmdPar); - + // Setup and start DMA. FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); @@ -655,7 +658,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // test for length of buffer if(dataLen > maxDataLen) { maxDataLen = dataLen; - if(dataLen > 400) { + if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) { Dbprintf("blew circular buffer! dataLen=%d", dataLen); break; } @@ -687,12 +690,12 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE; if(triggered) { - if (!LogTrace(receivedCmd, - Uart.len, - Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, - Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, - Uart.parity, - TRUE)) break; + if (!LogTrace(receivedCmd, + Uart.len, + Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, + Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, + Uart.parity, + TRUE)) break; } /* And ready to receive another command. */ UartReset(); @@ -709,12 +712,12 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) { LED_B_ON(); - if (!LogTrace(receivedResponse, - Demod.len, - Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, - Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, - Demod.parity, - FALSE)) break; + if (!LogTrace(receivedResponse, + Demod.len, + Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, + Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, + Demod.parity, + FALSE)) break; if ((!triggered) && (param & 0x01)) triggered = TRUE; @@ -745,7 +748,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { //----------------------------------------------------------------------------- // Prepare tag messages //----------------------------------------------------------------------------- -static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) +static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) { ToSendReset(); @@ -763,7 +766,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *pa ToSend[++ToSendMax] = SEC_D; LastProxToAirDuration = 8 * ToSendMax - 4; - for( uint16_t i = 0; i < len; i++) { + for(uint16_t i = 0; i < len; i++) { uint8_t b = cmd[i]; // Data bits @@ -884,7 +887,7 @@ int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par); bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity, uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity); -static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); +static uint8_t* free_buffer_pointer; typedef struct { uint8_t* response; @@ -894,10 +897,6 @@ typedef struct { uint32_t ProxToAirDuration; } tag_response_info_t; -void reset_free_buffer() { - free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); -} - bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) { // 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 @@ -909,7 +908,8 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe // ----------- + // 166 bytes, since every bit that needs to be send costs us a byte // - + + // Prepare the tag modulation bits from the message CodeIso14443aAsTag(response_info->response,response_info->response_n); @@ -930,15 +930,22 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe return true; } + +// "precompile" responses. There are 7 predefined responses with a total of 28 bytes data to transmit. +// Coded responses need one byte per bit to transfer (data, parity, start, stop, correction) +// 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits +// -> need 273 bytes buffer +#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273 + bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { // Retrieve and store the current buffer index response_info->modulation = free_buffer_pointer; // Determine the maximum size we can use from our buffer - size_t max_buffer_size = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + FREE_BUFFER_SIZE) - free_buffer_pointer; + size_t max_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE; // Forward the prepare tag modulation function to the inner function - if (prepare_tag_modulation(response_info,max_buffer_size)) { + if (prepare_tag_modulation(response_info, max_buffer_size)) { // Update the free buffer offset free_buffer_pointer += ToSendMax; return true; @@ -953,10 +960,6 @@ 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 - iso14a_clear_trace(); - iso14a_set_tracing(TRUE); - uint8_t sak; // The first response contains the ATQA (note: bytes are transmitted in reverse order). @@ -1000,10 +1003,11 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) } // The second response contains the (mandatory) first 24 bits of the UID - uint8_t response2[5]; + uint8_t response2[5] = {0x00}; // Check if the uid uses the (optional) part - uint8_t response2a[5]; + uint8_t response2a[5] = {0x00}; + if (uid_2nd) { response2[0] = 0x88; num_to_bytes(uid_1st,3,response2+1); @@ -1024,18 +1028,18 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3]; // Prepare the mandatory SAK (for 4 and 7 byte UID) - uint8_t response3[3]; + uint8_t response3[3] = {0x00}; response3[0] = sak; ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]); // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit - uint8_t response3a[3]; + uint8_t response3a[3] = {0x00}; response3a[0] = sak & 0xFB; ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce - uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: - // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, + uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: + // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1 // TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us) // TC(1) = 0x02: CID supported, NAD not supported @@ -1065,9 +1069,17 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) .modulation_n = 0 }; - // Reset the offset pointer of the free buffer - reset_free_buffer(); - + BigBuf_free_keep_EM(); + + // allocate buffers: + uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); + uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE); + free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE); + + // clear trace + iso14a_clear_trace(); + iso14a_set_tracing(TRUE); + // 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= 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_EndTime, reader_Parity, TRUE)) { - return FALSE; + // 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_EndTime, reader_Parity, TRUE)) { + return FALSE; } else return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, FALSE)); } else { return TRUE; @@ -1643,7 +1652,7 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive // Now get the answer from the card DemodInit(receivedResponse, receivedResponsePar); - + // clear RXRDY: uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; @@ -1685,23 +1694,23 @@ void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *tim void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing) { - // Generate parity and redirect - uint8_t par[MAX_PARITY_SIZE]; - GetParity(frame, len/8, par); - ReaderTransmitBitsPar(frame, len, par, timing); + // Generate parity and redirect + uint8_t par[MAX_PARITY_SIZE]; + GetParity(frame, len/8, par); + ReaderTransmitBitsPar(frame, len, par, timing); } void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) { - // Generate parity and redirect - uint8_t par[MAX_PARITY_SIZE]; - GetParity(frame, len, par); - ReaderTransmitBitsPar(frame, len*8, par, timing); + // Generate parity and redirect + uint8_t par[MAX_PARITY_SIZE]; + GetParity(frame, len, par); + ReaderTransmitBitsPar(frame, len*8, par, timing); } int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) { - if (!GetIso14443aAnswerFromTag(receivedAnswer,parity,offset)) return FALSE; + if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE; if (tracing) { LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); } @@ -1720,34 +1729,26 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) /* performs iso14443a anticollision procedure * fills the uid pointer unless NULL * fills resp_data unless NULL */ -int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) { - - //uint8_t deselect[] = {0xc2}; //DESELECT - //uint8_t halt[] = { 0x50, 0x00, 0x57, 0xCD }; // HALT - uint8_t wupa[] = { 0x52 }; // WAKE-UP - //uint8_t reqa[] = { 0x26 }; // REQUEST A +int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr) { + uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP uint8_t sel_all[] = { 0x93,0x20 }; uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 - uint8_t *resp = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET; - uint8_t *resp_par = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; - + uint8_t resp[MAX_FRAME_SIZE]; // theoretically. A usual RATS will be much smaller + uint8_t resp_par[MAX_PARITY_SIZE]; byte_t uid_resp[4]; size_t uid_resp_len; + uint8_t sak = 0x04; // cascade uid int cascade_level = 0; - int len =0; - - // test for the SKYLANDERS TOY. - // ReaderTransmit(deselect,sizeof(deselect), NULL); - // len = ReaderReceive(resp, resp_par); - + int len; + // Broadcast for a card, WUPA (0x52) will force response from all cards in the field - ReaderTransmitBitsPar(wupa,7,0, NULL); + ReaderTransmitBitsPar(wupa,7,0, NULL); // Receive the ATQA if(!ReaderReceive(resp, resp_par)) return 0; - + if(p_hi14a_card) { memcpy(p_hi14a_card->atqa, resp, 2); p_hi14a_card->uidlen = 0; @@ -1759,99 +1760,99 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u memset(uid_ptr,0,10); } - // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in - // which case we need to make a cascade 2 request and select - this is a long UID - // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. - for(; sak & 0x04; cascade_level++) { - // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) - sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; - - // SELECT_ALL - ReaderTransmit(sel_all,sizeof(sel_all), NULL); - if (!ReaderReceive(resp, resp_par)) return 0; - - if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit - memset(uid_resp, 0, 4); - uint16_t uid_resp_bits = 0; - uint16_t collision_answer_offset = 0; - // anti-collision-loop: - while (Demod.collisionPos) { - Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos); - for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point - uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01; - uid_resp[uid_resp_bits & 0xf8] |= UIDbit << (uid_resp_bits % 8); + // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in + // which case we need to make a cascade 2 request and select - this is a long UID + // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. + for(; sak & 0x04; cascade_level++) { + // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) + sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; + + // SELECT_ALL + ReaderTransmit(sel_all, sizeof(sel_all), NULL); + if (!ReaderReceive(resp, resp_par)) return 0; + + if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit + memset(uid_resp, 0, 4); + uint16_t uid_resp_bits = 0; + uint16_t collision_answer_offset = 0; + // anti-collision-loop: + while (Demod.collisionPos) { + Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos); + for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point + uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01; + uid_resp[uid_resp_bits / 8] |= UIDbit << (uid_resp_bits % 8); + } + uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position + uid_resp_bits++; + // construct anticollosion command: + sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits + for (uint16_t i = 0; i <= uid_resp_bits/8; i++) { + sel_uid[2+i] = uid_resp[i]; + } + collision_answer_offset = uid_resp_bits%8; + ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL); + if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0; } - uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position - uid_resp_bits++; - // construct anticollosion command: - sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits - for (uint16_t i = 0; i <= uid_resp_bits/8; i++) { - sel_uid[2+i] = uid_resp[i]; + // finally, add the last bits and BCC of the UID + for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) { + uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01; + uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8); } - collision_answer_offset = uid_resp_bits%8; - ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL); - if (!ReaderReceiveOffset(resp, collision_answer_offset,resp_par)) return 0; - } - // finally, add the last bits and BCC of the UID - for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) { - uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01; - uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8); - } - } else { // no collision, use the response to SELECT_ALL as current uid - memcpy(uid_resp,resp,4); - } - uid_resp_len = 4; + } else { // no collision, use the response to SELECT_ALL as current uid + memcpy(uid_resp, resp, 4); + } + uid_resp_len = 4; - // calculate crypto UID. Always use last 4 Bytes. - if(cuid_ptr) { - *cuid_ptr = bytes_to_num(uid_resp, 4); - } + // calculate crypto UID. Always use last 4 Bytes. + if(cuid_ptr) { + *cuid_ptr = bytes_to_num(uid_resp, 4); + } - // Construct SELECT UID command - sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC) - memcpy(sel_uid+2,uid_resp,4); // the UID - sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC - AppendCrc14443a(sel_uid,7); // calculate and add CRC - ReaderTransmit(sel_uid,sizeof(sel_uid), NULL); + // Construct SELECT UID command + sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC) + memcpy(sel_uid+2, uid_resp, 4); // the UID + sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC + AppendCrc14443a(sel_uid, 7); // calculate and add CRC + ReaderTransmit(sel_uid, sizeof(sel_uid), NULL); - // Receive the SAK + // Receive the SAK if (!ReaderReceive(resp, resp_par)) return 0; - sak = resp[0]; - + sak = resp[0]; + // Test if more parts of the uid are coming - if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) { - // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of: - // http://www.nxp.com/documents/application_note/AN10927.pdf - uid_resp[0] = uid_resp[1]; - uid_resp[1] = uid_resp[2]; - uid_resp[2] = uid_resp[3]; - - uid_resp_len = 3; - } + if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) { + // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of: + // http://www.nxp.com/documents/application_note/AN10927.pdf + uid_resp[0] = uid_resp[1]; + uid_resp[1] = uid_resp[2]; + uid_resp[2] = uid_resp[3]; + + uid_resp_len = 3; + } - if(uid_ptr) { - memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); - } + if(uid_ptr) { + memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); + } - if(p_hi14a_card) { - memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); - p_hi14a_card->uidlen += uid_resp_len; - } - } + if(p_hi14a_card) { + memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); + p_hi14a_card->uidlen += uid_resp_len; + } + } - if(p_hi14a_card) { - p_hi14a_card->sak = sak; - p_hi14a_card->ats_len = 0; - } + if(p_hi14a_card) { + p_hi14a_card->sak = sak; + p_hi14a_card->ats_len = 0; + } // non iso14443a compliant tag if( (sak & 0x20) == 0) return 2; - + // Request for answer to select AppendCrc14443a(rats, 2); ReaderTransmit(rats, sizeof(rats), NULL); - + if (!(len = ReaderReceive(resp, resp_par))) return 0; @@ -1862,7 +1863,7 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u // reset the PCB block number iso14_pcb_blocknum = 0; - return 1; + return 1; } void iso14443a_setup(uint8_t fpga_minor_mode) { @@ -1873,7 +1874,8 @@ void iso14443a_setup(uint8_t fpga_minor_mode) { SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Signal field is on with the appropriate LED - if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) { + if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD + || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) { LED_D_ON(); } else { LED_D_OFF(); @@ -1886,7 +1888,7 @@ void iso14443a_setup(uint8_t fpga_minor_mode) { DemodReset(); UartReset(); NextTransferTime = 2*DELAY_ARM2AIR_AS_READER; - iso14a_set_timeout(1050); // 10ms default 10*105 = + iso14a_set_timeout(1050); // 10ms default } int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { @@ -1901,7 +1903,7 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { ReaderTransmit(real_cmd, cmd_len+4, NULL); size_t len = ReaderReceive(data, parity); - uint8_t * data_bytes = (uint8_t *) data; + uint8_t *data_bytes = (uint8_t *) data; if (!len) return 0; //DATA LINK ERROR // if we received an I- or R(ACK)-Block with a block number equal to the @@ -1965,8 +1967,8 @@ void ReaderIso14443a(UsbCommand *c) len += 2; if (lenbits) lenbits += 16; } - if(lenbits>0) { - GetParity(cmd, lenbits/8, par); + if(lenbits>0) { + GetParity(cmd, lenbits/8, par); ReaderTransmitBitsPar(cmd, lenbits, par, NULL); } else { ReaderTransmit(cmd,len, NULL); @@ -2025,9 +2027,12 @@ void ReaderMifare(bool first_try) uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; static uint8_t mf_nr_ar3; - uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET); - uint8_t* receivedAnswerPar = (((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET); + uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE]; + // free eventually allocated BigBuf memory. We want all for tracing. + BigBuf_free(); + iso14a_clear_trace(); iso14a_set_tracing(TRUE); @@ -2164,7 +2169,7 @@ void ReaderMifare(bool first_try) led_on = !led_on; if(led_on) LED_B_ON(); else LED_B_OFF(); - par_list[nt_diff] = SwapBits(par[0], 8); + par_list[nt_diff] = SwapBits(par[0], 8); ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; // Test if the information is complete @@ -2237,10 +2242,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * struct Crypto1State *pcs; pcs = &mpcs; uint32_t numReads = 0;//Counts numer of times reader read a block - uint8_t* receivedCmd = get_bigbufptr_recvcmdbuf(); - uint8_t* receivedCmd_par = receivedCmd + MAX_FRAME_SIZE; - uint8_t* response = get_bigbufptr_recvrespbuf(); - uint8_t* response_par = response + MAX_FRAME_SIZE; + uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE]; + uint8_t response[MAX_MIFARE_FRAME_SIZE]; + uint8_t response_par[MAX_MIFARE_PARITY_SIZE]; uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; @@ -2257,6 +2262,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0}; uint8_t ar_nr_collected = 0; + // free eventually allocated BigBuf memory but keep Emulator Memory + BigBuf_free_keep_EM(); // clear trace iso14a_clear_trace(); iso14a_set_tracing(TRUE); @@ -2727,18 +2734,20 @@ void RAMFUNC SniffMifare(uint8_t param) { // The command (reader -> tag) that we're receiving. // The length of a received command will in most cases be no more than 18 bytes. // So 32 should be enough! - uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); - uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET; + uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedCmdPar[MAX_MIFARE_PARITY_SIZE]; // The response (tag -> reader) that we're receiving. - uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET); - uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; - + uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE]; + uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE]; + // As we receive stuff, we copy it from receivedCmd or receivedResponse // into trace, along with its length and other annotations. //uint8_t *trace = (uint8_t *)BigBuf; - // The DMA buffer, used to stream samples from the FPGA - uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + // free eventually allocated BigBuf memory + BigBuf_free(); + // allocate the DMA buffer, used to stream samples from the FPGA + uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); uint8_t *data = dmaBuf; uint8_t previous_data = 0; int maxDataLen = 0; @@ -2797,7 +2806,7 @@ void RAMFUNC SniffMifare(uint8_t param) { // test for length of buffer if(dataLen > maxDataLen) { // we are more behind than ever... maxDataLen = dataLen; - if(dataLen > 400) { + if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) { Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); break; }