X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d19929cbe8d681b60496ca6d9d9cbd806822e163..3be2a5ae0b3f153a60a04ff83b7c3f864d716371:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index af7b3545..3f775de5 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -14,6 +14,7 @@ #include "apps.h" #include "util.h" #include "string.h" +#include "cmd.h" #include "iso14443crc.h" #include "iso14443a.h" @@ -64,16 +65,16 @@ const uint8_t OddByteParity[256] = { }; -void iso14a_set_trigger(int enable) { +void iso14a_set_trigger(bool enable) { trigger = enable; } -void iso14a_clear_trace(void) { - memset(trace, 0x44, TRACE_SIZE); +void iso14a_clear_trace() { + memset(trace, 0x44, TRACE_SIZE); traceLen = 0; } -void iso14a_set_tracing(int enable) { +void iso14a_set_tracing(bool enable) { tracing = enable; } @@ -87,25 +88,25 @@ void iso14a_set_timeout(uint32_t timeout) { //----------------------------------------------------------------------------- byte_t oddparity (const byte_t bt) { - return OddByteParity[bt]; + return OddByteParity[bt]; } uint32_t GetParity(const uint8_t * pbtCmd, int iLen) { - int i; - uint32_t dwPar = 0; + int i; + uint32_t dwPar = 0; - // Generate the encrypted data - for (i = 0; i < iLen; i++) { - // Save the encrypted parity bit - dwPar |= ((OddByteParity[pbtCmd[i]]) << i); - } - return dwPar; + // Generate the parity bits + for (i = 0; i < iLen; i++) { + // and save them to a 32Bit word + dwPar |= ((OddByteParity[pbtCmd[i]]) << i); + } + return dwPar; } void AppendCrc14443a(uint8_t* data, int len) { - ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1); + ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1); } // The function LogTrace() is also used by the iClass implementation in iClass.c @@ -374,196 +375,176 @@ static RAMFUNC int MillerDecoding(int bit) } //============================================================================= -// ISO 14443 Type A - Manchester +// ISO 14443 Type A - Manchester decoder //============================================================================= +// Basics: +// 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 ....... +// The Manchester decoder needs to identify the following sequences: +// 4 ticks modulated followed by 4 ticks unmodulated: Sequence D = 1 (also used as "start of communication") +// 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 2: parameter offset is used to determine the position of the parity bits (required for the anticollision command only) static tDemod Demod; -static RAMFUNC int ManchesterDecoding(int v) +inline RAMFUNC bool IsModulation(byte_t b) { - int bit; - int modulation; - //int error = 0; - - if(!Demod.buff) { - Demod.buff = 1; - Demod.buffer = v; - return FALSE; - } - else { - bit = Demod.buffer; - Demod.buffer = v; - } + if (b >= 5 || b == 3) // majority decision: 2 or more bits are set + return true; + else + return false; + +} - if(Demod.state==DEMOD_UNSYNCD) { - Demod.output[Demod.len] = 0xfa; - Demod.syncBit = 0; - //Demod.samples = 0; - Demod.posCount = 1; // This is the first half bit period, so after syncing handle the second part +inline RAMFUNC bool IsModulationNibble1(byte_t b) +{ + return IsModulation((b & 0xE0) >> 5); +} - if(bit & 0x08) { - Demod.syncBit = 0x08; - } +inline RAMFUNC bool IsModulationNibble2(byte_t b) +{ + return IsModulation((b & 0x0E) >> 1); +} - if(bit & 0x04) { - if(Demod.syncBit) { - bit <<= 4; +static RAMFUNC int ManchesterDecoding(int bit, uint16_t offset) +{ + + 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(); + 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; } - Demod.syncBit = 0x04; - } + break; - if(bit & 0x02) { - if(Demod.syncBit) { - bit <<= 2; - } - Demod.syncBit = 0x02; - } - if(bit & 0x01 && Demod.syncBit) { - Demod.syncBit = 0x01; - } - - if(Demod.syncBit) { - Demod.len = 0; - Demod.state = DEMOD_START_OF_COMMUNICATION; - Demod.sub = SUB_FIRST_HALF; - Demod.bitCount = 0; - Demod.shiftReg = 0; - Demod.parityBits = 0; - Demod.samples = 0; - if(Demod.posCount) { - if(trigger) LED_A_OFF(); - switch(Demod.syncBit) { - case 0x08: Demod.samples = 3; break; - case 0x04: Demod.samples = 2; break; - case 0x02: Demod.samples = 1; break; - case 0x01: Demod.samples = 0; break; + 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; } } - //error = 0; - } - } - else { - //modulation = bit & Demod.syncBit; - modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit; - - Demod.samples += 4; - - if(Demod.posCount==0) { - Demod.posCount = 1; - if(modulation) { - Demod.sub = SUB_FIRST_HALF; + break; + + + case DEMOD_MOD_FIRST_HALF: + Demod.samples += 8; + Demod.bitCount++; + if (IsModulationNibble1(bit)) { // modulation in both halfs - 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.output[Demod.len++] = (Demod.shiftReg & 0xff); + Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit + Demod.bitCount = 0; + Demod.shiftReg = 0; } - else { - Demod.sub = SUB_NONE; + 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; } - } - else { - Demod.posCount = 0; - if(modulation && (Demod.sub == SUB_FIRST_HALF)) { - if(Demod.state!=DEMOD_ERROR_WAIT) { - Demod.state = DEMOD_ERROR_WAIT; - Demod.output[Demod.len] = 0xaa; - //error = 0x01; + break; + + + case DEMOD_NOMOD_FIRST_HALF: + if (IsModulationNibble1(bit)) { // modulation in second half only - Sequence E = 0 + Demod.bitCount++; + Demod.samples += 8; + 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 + 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 } - else if(modulation) { - Demod.sub = SUB_SECOND_HALF; + 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; + - switch(Demod.state) { - case DEMOD_START_OF_COMMUNICATION: - if(Demod.sub == SUB_FIRST_HALF) { - Demod.state = DEMOD_MANCHESTER_D; - } - else { - Demod.output[Demod.len] = 0xab; - Demod.state = DEMOD_ERROR_WAIT; - //error = 0x02; - } - break; - - case DEMOD_MANCHESTER_D: - case DEMOD_MANCHESTER_E: - if(Demod.sub == SUB_FIRST_HALF) { - Demod.bitCount++; - Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100; - Demod.state = DEMOD_MANCHESTER_D; - } - else if(Demod.sub == SUB_SECOND_HALF) { - Demod.bitCount++; - Demod.shiftReg >>= 1; - Demod.state = DEMOD_MANCHESTER_E; - } - else { - Demod.state = DEMOD_MANCHESTER_F; + 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; } - break; - - case DEMOD_MANCHESTER_F: - // Tag response does not need to be a complete byte! - if(Demod.len > 0 || Demod.bitCount > 0) { - if(Demod.bitCount > 0) { - Demod.shiftReg >>= (9 - Demod.bitCount); - Demod.output[Demod.len] = Demod.shiftReg & 0xff; - Demod.len++; - // No parity bit, so just shift a 0 - Demod.parityBits <<= 1; - } - - Demod.state = DEMOD_UNSYNCD; - return TRUE; + } // 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 { - Demod.output[Demod.len] = 0xad; - Demod.state = DEMOD_ERROR_WAIT; - //error = 0x03; + } else { // no modulation in both halves - End of communication + 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; } - break; - - case DEMOD_ERROR_WAIT: - Demod.state = DEMOD_UNSYNCD; - break; - - default: - Demod.output[Demod.len] = 0xdd; - Demod.state = DEMOD_UNSYNCD; - break; - } - - if(Demod.bitCount>=9) { - Demod.output[Demod.len] = Demod.shiftReg & 0xff; - Demod.len++; - - Demod.parityBits <<= 1; - Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01); - - Demod.bitCount = 0; - Demod.shiftReg = 0; + Demod.state = DEMOD_UNSYNCD; // start from the beginning + return TRUE; // we are finished with decoding the raw data sequence + } } + + } - /*if(error) { - Demod.output[Demod.len] = 0xBB; - Demod.len++; - Demod.output[Demod.len] = error & 0xFF; - Demod.len++; - Demod.output[Demod.len] = 0xBB; - Demod.len++; - Demod.output[Demod.len] = bit & 0xFF; - Demod.len++; - Demod.output[Demod.len] = Demod.buffer & 0xFF; - Demod.len++; - Demod.output[Demod.len] = Demod.syncBit & 0xFF; - Demod.len++; - Demod.output[Demod.len] = 0xBB; - Demod.len++; - return TRUE; - }*/ - - } - - } // end (state != UNSYNCED) - - return FALSE; + return FALSE; // not finished yet, need more data } //============================================================================= @@ -583,7 +564,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { LEDsoff(); // init trace buffer - iso14a_clear_trace(); + iso14a_clear_trace(); // 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 @@ -671,7 +652,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { } LED_A_OFF(); - + rsamples += 4; if(MillerDecoding((data[0] & 0xF0) >> 4)) { LED_C_ON(); @@ -690,7 +671,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { LED_B_OFF(); } - if(ManchesterDecoding(data[0] & 0x0F)) { + if(ManchesterDecoding(data[0], 0)) { LED_B_ON(); if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break; @@ -774,54 +755,54 @@ 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++; -} +////----------------------------------------------------------------------------- +//// 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) { int i; - ToSendReset(); + ToSendReset(); // Correction bit, might be removed when not needed ToSendStuffBit(0); @@ -854,8 +835,8 @@ static void Code4bitAnswerAsTag(uint8_t cmd) ToSend[++ToSendMax] = SEC_F; } - // Convert from last byte pos to length - ToSendMax++; + // Convert from last byte pos to length + ToSendMax++; } //----------------------------------------------------------------------------- @@ -897,17 +878,86 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen } } } + static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded); +int EmSend4bitEx(uint8_t resp, int 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 EmSendCmd(uint8_t *resp, int respLen); +int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par); + +static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + +typedef struct { + uint8_t* response; + size_t response_n; + uint8_t* modulation; + size_t modulation_n; +} 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) { + // Exmaple 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 + // 2 Start and stop + // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA) + // 1 just for the case + // ----------- + + // 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); + + // Make sure we do not exceed the free buffer space + if (ToSendMax > max_buffer_size) { + Dbprintf("Out of memory, when modulating bits for tag answer:"); + Dbhexdump(response_info->response_n,response_info->response,false); + return false; + } + + // 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 + response_info->modulation_n = ToSendMax; + + return true; +} + +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; + + // Forward the prepare tag modulation function to the inner function + if (prepare_tag_modulation(response_info,max_buffer_size)) { + // Update the free buffer offset + free_buffer_pointer += ToSendMax; + return true; + } else { + return false; + } +} //----------------------------------------------------------------------------- // Main loop of simulated tag: receive commands from reader, decide what // response to send, and send it. //----------------------------------------------------------------------------- -void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd) +void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) { - // Enable and clear the trace + // Enable and clear the trace tracing = TRUE; - iso14a_clear_trace(); + iso14a_clear_trace(); // This function contains the tag emulation uint8_t sak; @@ -981,57 +1031,41 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd) ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce - uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS - ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]); - - uint8_t *resp; - int respLen; - - // Longest possible response will be 16 bytes + 2 CRC = 18 bytes - // This will need - // 144 data bits (18 * 8) - // 18 parity bits - // 2 Start and stop - // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA) - // 1 just for the case - // ----------- + - // 166 - // - // 166 bytes, since every bit that needs to be send costs us a byte - // - - // Respond with card type - uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); - int resp1Len; - - // Anticollision cascade1 - respond with uid - uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166); - int resp2Len; - - // Anticollision cascade2 - respond with 2nd half of uid if asked - // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88 - uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140); - int resp2aLen; - - // Acknowledge select - cascade 1 - uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2)); - int resp3Len; - - // Acknowledge select - cascade 2 - uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3)); - int resp3aLen; - - // Response to a read request - not implemented atm - uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4)); - int resp4Len; - - // Authenticate response - nonce - uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5)); - int resp5Len; - - // Authenticate response - nonce - uint8_t *resp6 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*6)); - int resp6Len; + 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 + }; + + // Reset the offset pointer of the free buffer + reset_free_buffer(); + + // 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]; + + // 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; + } } // Count number of wakeups received after a halt @@ -1173,138 +1209,97 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd) if(cmdsRecvd > 999) { DbpString("1000 commands later..."); break; - } else { - cmdsRecvd++; - } - - if(respLen > 0) { - EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52); - } - - if (tracing) { - LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE); - if (respdata != NULL) { - LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE); - } - if(traceLen > TRACE_SIZE) { - DbpString("Trace full"); - break; - } } - - memset(receivedCmd, 0x44, RECV_CMD_SIZE); + 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; + } + } + } } Dbprintf("%x %x %x", happened, happened2, cmdsRecvd); LED_A_OFF(); } -//----------------------------------------------------------------------------- -// Transmit the command (to the tag) that was placed in ToSend[]. -//----------------------------------------------------------------------------- -static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wait) -{ - int c; - - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - - if (wait) - if(*wait < 10) - *wait = 10; - - for(c = 0; c < *wait;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing! - c++; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; - c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - if (samples) *samples = (c + *wait) << 3; +// prepare a delayed transfer. This simply shifts ToSend[] by a number +// of bits specified in the delay parameter. +void PrepareDelayedTransfer(uint16_t delay) +{ + uint8_t bitmask = 0; + uint8_t bits_to_shift = 0; + uint8_t bits_shifted = 0; + + 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++) { + bits_to_shift = ToSend[i] & bitmask; + ToSend[i] = ToSend[i] >> delay; + ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay)); + bits_shifted = bits_to_shift; + } + } } //----------------------------------------------------------------------------- -// Code a 7-bit command without parity bit -// This is especially for 0x26 and 0x52 (REQA and WUPA) +// Transmit the command (to the tag) that was placed in ToSend[]. +// Parameter timing: +// if NULL: ignored +// if == 0: return time of transfer +// if != 0: delay transfer until time specified //----------------------------------------------------------------------------- -void ShortFrameFromReader(const uint8_t bt) +static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing) { - int j; - int last; - uint8_t b; + int c; - ToSendReset(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - // Start of Communication (Seq. Z) - ToSend[++ToSendMax] = SEC_Z; - last = 0; - b = bt; - for(j = 0; j < 7; j++) { - if(b & 1) { - // Sequence X - ToSend[++ToSendMax] = SEC_X; - last = 1; + if (timing) { + if(*timing == 0) { // Measure time + *timing = (GetCountMifare() + 8) & 0xfffffff8; } else { - if(last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } - else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } + PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) } - b >>= 1; + if(MF_DBGLEVEL >= 4 && GetCountMifare() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); + while(GetCountMifare() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) } - // End of Communication - if(last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; + 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++; + } } - else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; + + c = 0; + for(;;) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + AT91C_BASE_SSC->SSC_THR = cmd[c]; + c++; + if(c >= len) { + break; + } + } } - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - - // Just to be sure! - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - // Convert from last character reference to length - ToSendMax++; } //----------------------------------------------------------------------------- -// Prepare reader command to send to FPGA -// +// Prepare reader command (in bits, support short frames) to send to FPGA //----------------------------------------------------------------------------- -void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) +void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity) { int i, j; int last; @@ -1316,12 +1311,14 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) ToSend[++ToSendMax] = SEC_Z; last = 0; + size_t bytecount = nbytes(bits); // Generate send structure for the data bits - for (i = 0; i < len; i++) { + 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 < 8; j++) { + for (j = 0; j < bitsleft; j++) { if (b & 1) { // Sequence X ToSend[++ToSendMax] = SEC_X; @@ -1339,19 +1336,22 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) b >>= 1; } - // 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; + // 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 { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } } } } @@ -1378,9 +1378,17 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) } //----------------------------------------------------------------------------- -// Wait for commands from reader -// Stop when button is pressed (return 1) or field was gone (return 2) -// Or return 0 when command is captured +// Prepare reader command to send to FPGA +//----------------------------------------------------------------------------- +void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) +{ + CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity); +} + +//----------------------------------------------------------------------------- +// Wait for commands from reader +// 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) { @@ -1530,198 +1538,244 @@ int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){ //----------------------------------------------------------------------------- // Wait a certain time for tag response // If a response is captured return TRUE -// If it takes to long return FALSE +// If it takes too long return FALSE //----------------------------------------------------------------------------- -static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer +static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, int maxLen, int *samples) { - // buffer needs to be 512 bytes int c; - + // Set FPGA mode to "reader listen mode", no modulation (listen // only, since we are receiving, not transmitting). // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); - + // Now get the answer from the card Demod.output = receivedResponse; Demod.len = 0; Demod.state = DEMOD_UNSYNCD; uint8_t b; - if (elapsed) *elapsed = 0; 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_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>>4) & 0xf)) { - *samples = ((c - 1) << 3) + 4; - return TRUE; - } - if(ManchesterDecoding(b & 0x0f)) { - *samples = c << 3; + if(ManchesterDecoding(b, offset)) { + *samples = Demod.samples; return TRUE; } } } } -void ReaderTransmitShort(const uint8_t* bt) -{ - int wait = 0; - int samples = 0; - - ShortFrameFromReader(*bt); - - // Select the card - TransmitFor14443a(ToSend, ToSendMax, &samples, &wait); - - // Store reader command in buffer - if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE); -} - -void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par) +void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par, uint32_t *timing) { - int wait = 0; - int samples = 0; - // This is tied to other size changes - // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024; - CodeIso14443aAsReaderPar(frame,len,par); - - // Select the card - TransmitFor14443a(ToSend, ToSendMax, &samples, &wait); + CodeIso14443aBitsAsReaderPar(frame,bits,par); + + // 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); +} - // Store reader command in buffer - if (tracing) LogTrace(frame,len,0,par,TRUE); +void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par, uint32_t *timing) +{ + ReaderTransmitBitsPar(frame,len*8,par, timing); } +void ReaderTransmitBits(uint8_t* frame, int len, uint32_t *timing) +{ + // Generate parity and redirect + ReaderTransmitBitsPar(frame,len,GetParity(frame,len/8), timing); +} -void ReaderTransmit(uint8_t* frame, int len) +void ReaderTransmit(uint8_t* frame, int len, uint32_t *timing) { // Generate parity and redirect - ReaderTransmitPar(frame,len,GetParity(frame,len)); + ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len), 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; + return Demod.len; } int ReaderReceive(uint8_t* receivedAnswer) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); - if(samples == 0) return FALSE; - return Demod.len; + return ReaderReceiveOffset(receivedAnswer, 0); } -int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr) +int ReaderReceivePar(uint8_t *receivedAnswer, uint32_t *parptr) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); + int samples = 0; + if (!GetIso14443aAnswerFromTag(receivedAnswer,0,160,&samples)) return FALSE; + if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); *parptr = Demod.parityBits; - if(samples == 0) return FALSE; - return Demod.len; + if(samples == 0) return FALSE; + return Demod.len; } -/* performs iso14443a anticolision procedure +/* performs iso14443a anticollision procedure * fills the uid pointer unless NULL * fills resp_data unless NULL */ -int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, 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 +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) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes + byte_t uid_resp[4]; + size_t uid_resp_len; + + uint8_t sak = 0x04; // cascade uid + int cascade_level = 0; + int len; + + // 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]); + + if(p_hi14a_card) { + memcpy(p_hi14a_card->atqa, resp, 2); + p_hi14a_card->uidlen = 0; + memset(p_hi14a_card->uid,0,10); + } - uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes + // clear uid + if (uid_ptr) { + memset(uid_ptr,0,10); + } - uint8_t sak = 0x04; // cascade uid - int cascade_level = 0; + // 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)) 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); + } + 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)) 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); + } - int len; - - // clear uid - memset(uid_ptr, 0, 8); + } else { // no collision, use the response to SELECT_ALL as current uid + 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]); - // Broadcast for a card, WUPA (0x52) will force response from all cards in the field - ReaderTransmitShort(wupa); - // Receive the ATQA - if(!ReaderReceive(resp)) return 0; + // calculate crypto UID. Always use last 4 Bytes. + if(cuid_ptr) { + *cuid_ptr = bytes_to_num(uid_resp, 4); + } - if(resp_data) - memcpy(resp_data->atqa, resp, 2); - - // 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; + // 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 + if (!ReaderReceive(resp)) return 0; + sak = resp[0]; + + // Test if more parts of the uid are comming + 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 + memcpy(uid_resp, uid_resp + 1, 3); + uid_resp_len = 3; + } - // SELECT_ALL - ReaderTransmit(sel_all,sizeof(sel_all)); - if (!ReaderReceive(resp)) return 0; - if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4); - - // calculate crypto UID - if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4); + if(uid_ptr) { + memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); + } - // Construct SELECT UID command - memcpy(sel_uid+2,resp,5); - AppendCrc14443a(sel_uid,7); - ReaderTransmit(sel_uid,sizeof(sel_uid)); + if(p_hi14a_card) { + memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); + p_hi14a_card->uidlen += uid_resp_len; + } + } - // Receive the SAK - if (!ReaderReceive(resp)) return 0; - sak = resp[0]; - } - if(resp_data) { - resp_data->sak = sak; - resp_data->ats_len = 0; - } - //-- this byte not UID, it CT. http://www.nxp.com/documents/application_note/AN10927.pdf page 3 - if (uid_ptr[0] == 0x88) { - memcpy(uid_ptr, uid_ptr + 1, 7); - uid_ptr[7] = 0; - } + if(p_hi14a_card) { + p_hi14a_card->sak = sak; + p_hi14a_card->ats_len = 0; + } - if( (sak & 0x20) == 0) - return 2; // non iso14443a compliant tag + if( (sak & 0x20) == 0) { + return 2; // non iso14443a compliant tag + } - // Request for answer to select - if(resp_data) { // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!! - AppendCrc14443a(rats, 2); - ReaderTransmit(rats, sizeof(rats)); - - if (!(len = ReaderReceive(resp))) return 0; - - memcpy(resp_data->ats, resp, sizeof(resp_data->ats)); - resp_data->ats_len = len; - } - - // reset the PCB block number - iso14_pcb_blocknum = 0; - - return 1; + // Request for answer to select + AppendCrc14443a(rats, 2); + ReaderTransmit(rats, sizeof(rats), NULL); + + if (!(len = ReaderReceive(resp))) return 0; + + if(p_hi14a_card) { + memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats)); + p_hi14a_card->ats_len = len; + } + + // reset the PCB block number + iso14_pcb_blocknum = 0; + return 1; } void iso14443a_setup() { - // Setup SSC + // 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(200); +// LED_D_OFF(); +// FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + // SpinDelay(50); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); @@ -1729,8 +1783,9 @@ void iso14443a_setup() { // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - SpinDelay(200); + SpinDelay(7); // iso14443-3 specifies 5ms max. + Demod.state = DEMOD_UNSYNCD; iso14a_timeout = 2048; //default } @@ -1743,7 +1798,7 @@ int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { memcpy(real_cmd+2, cmd, cmd_len); AppendCrc14443a(real_cmd,cmd_len+2); - ReaderTransmit(real_cmd, cmd_len+4); + ReaderTransmit(real_cmd, cmd_len+4, NULL); size_t len = ReaderReceive(data); uint8_t * data_bytes = (uint8_t *) data; if (!len) @@ -1765,18 +1820,32 @@ 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, UsbCommand * ack) +void ReaderIso14443a(UsbCommand * c) { iso14a_command_t param = c->arg[0]; uint8_t * cmd = c->d.asBytes; size_t len = c->arg[1]; + size_t lenbits = c->arg[2]; + uint32_t arg0 = 0; + byte_t buf[USB_CMD_DATA_SIZE]; + + if(param & ISO14A_CONNECT) { + iso14a_clear_trace(); + } + + iso14a_set_tracing(true); - if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1); + if(param & ISO14A_REQUEST_TRIGGER) { + iso14a_set_trigger(1); + } if(param & ISO14A_CONNECT) { iso14443a_setup(); - ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + if(!(param & ISO14A_NO_SELECT)) { + iso14a_card_select_t *card = (iso14a_card_select_t*)buf; + arg0 = iso14443a_select_card(NULL,card,NULL); + cmd_send(CMD_ACK,arg0,card->uidlen,0,buf,sizeof(iso14a_card_select_t)); + } } if(param & ISO14A_SET_TIMEOUT) { @@ -1788,8 +1857,8 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack) } if(param & ISO14A_APDU) { - ack->arg[0] = iso14_apdu(cmd, len, ack->d.asBytes); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + arg0 = iso14_apdu(cmd, len, buf); + cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); } if(param & ISO14A_RAW) { @@ -1797,100 +1866,210 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack) AppendCrc14443a(cmd,len); len += 2; } - ReaderTransmit(cmd,len); - ack->arg[0] = ReaderReceive(ack->d.asBytes); - UsbSendPacket((void *)ack, sizeof(UsbCommand)); + if(lenbits>0) { + ReaderTransmitBitsPar(cmd,lenbits,GetParity(cmd,lenbits/8), NULL); + } else { + ReaderTransmit(cmd,len, NULL); + } + arg0 = ReaderReceive(buf); + cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); } - if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0); + if(param & ISO14A_REQUEST_TRIGGER) { + iso14a_set_trigger(0); + } - if(param & ISO14A_NO_DISCONNECT) + if(param & ISO14A_NO_DISCONNECT) { return; + } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); } + +// Determine the distance between two nonces. +// Assume that the difference is small, but we don't know which is first. +// Therefore try in alternating directions. +int32_t dist_nt(uint32_t nt1, uint32_t nt2) { + + uint16_t i; + uint32_t nttmp1, nttmp2; + + if (nt1 == nt2) return 0; + + nttmp1 = nt1; + nttmp2 = nt2; + + for (i = 1; i < 32768; i++) { + nttmp1 = prng_successor(nttmp1, 1); + if (nttmp1 == nt2) return i; + nttmp2 = prng_successor(nttmp2, 1); + if (nttmp2 == nt1) return -i; + } + + return(-99999); // either nt1 or nt2 are invalid nonces +} + + //----------------------------------------------------------------------------- -// Read an ISO 14443a tag. Send out commands and store answers. -// +// Recover several bits of the cypher stream. This implements (first stages of) +// the algorithm described in "The Dark Side of Security by Obscurity and +// Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime" +// (article by Nicolas T. Courtois, 2009) //----------------------------------------------------------------------------- -void ReaderMifare(uint32_t parameter) +void ReaderMifare(bool first_try) { // Mifare AUTH uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b }; 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) + 3560); // was 3560 - tied to other size changes - traceLen = 0; + uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + iso14a_clear_trace(); tracing = false; - iso14443a_setup(); - - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - byte_t nt_diff = 0; - LED_A_OFF(); byte_t par = 0; //byte_t par_mask = 0xff; - byte_t par_low = 0; - int led_on = TRUE; - uint8_t uid[8]; + static byte_t par_low = 0; + bool led_on = TRUE; + uint8_t uid[10]; uint32_t cuid; - tracing = FALSE; - byte_t nt[4] = {0,0,0,0}; - byte_t nt_attacked[4], nt_noattack[4]; + uint32_t nt, previous_nt; + static uint32_t nt_attacked = 0; byte_t par_list[8] = {0,0,0,0,0,0,0,0}; byte_t ks_list[8] = {0,0,0,0,0,0,0,0}; - num_to_bytes(parameter, 4, nt_noattack); - int isOK = 0, isNULL = 0; - while(TRUE) - { - LED_C_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - LED_C_OFF(); + static uint32_t sync_time; + static uint32_t sync_cycles; + int catch_up_cycles = 0; + int last_catch_up = 0; + uint16_t consecutive_resyncs = 0; + int isOK = 0; + + + + 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; + sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). + nt_attacked = 0; + nt = 0; + par = 0; + } + else { + // we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same) + // nt_attacked = prng_successor(nt_attacked, 1); + mf_nr_ar3++; + mf_nr_ar[3] = mf_nr_ar3; + par = par_low; + } + + LED_A_ON(); + LED_B_OFF(); + LED_C_OFF(); + + + for(uint16_t i = 0; TRUE; i++) { + + WDT_HIT(); // Test if the action was cancelled if(BUTTON_PRESS()) { break; } + + LED_C_ON(); + + if(!iso14443a_select_card(uid, NULL, &cuid)) { + if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card"); + continue; + } - if(!iso14443a_select_card(uid, NULL, &cuid)) continue; + //keep the card active + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - // Transmit MIFARE_CLASSIC_AUTH - ReaderTransmit(mf_auth, sizeof(mf_auth)); + sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; + catch_up_cycles = 0; - // Receive the (16 bit) "random" nonce - if (!ReaderReceive(receivedAnswer)) continue; - memcpy(nt, receivedAnswer, 4); + // if we missed the sync time already, advance to the next nonce repeat + while(GetCountMifare() > sync_time) { + sync_time = (sync_time & 0xfffffff8) + sync_cycles; + } - // Transmit reader nonce and reader answer - ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par); + // 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 4 bit answer - if (ReaderReceive(receivedAnswer)) - { - if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue; + // Receive the (4 Byte) "random" nonce + if (!ReaderReceive(receivedAnswer)) { + if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Couldn't receive tag nonce"); + continue; + } + + previous_nt = nt; + nt = bytes_to_num(receivedAnswer, 4); - isNULL = !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0); - if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue; + // Transmit reader nonce with fake par + ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL); + 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) { + nt_attacked = nt; + } + else { + if (nt_distance == -99999) { // invalid nonce received, try again + continue; + } + sync_cycles = (sync_cycles - nt_distance); + if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles); + continue; + } + } + + if ((nt != nt_attacked) && nt_attacked) { // we somehow lost sync. Try to catch up again... + catch_up_cycles = -dist_nt(nt_attacked, nt); + if (catch_up_cycles == 99999) { // invalid nonce received. Don't resync on that one. + catch_up_cycles = 0; + continue; + } + if (catch_up_cycles == last_catch_up) { + consecutive_resyncs++; + } + else { + last_catch_up = catch_up_cycles; + consecutive_resyncs = 0; + } + if (consecutive_resyncs < 3) { + if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, -catch_up_cycles, consecutive_resyncs); + } + else { + sync_cycles = sync_cycles + catch_up_cycles; + if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles); + } + 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)) + { + catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer + if (nt_diff == 0) { - LED_A_ON(); - memcpy(nt_attacked, nt, 4); - //par_mask = 0xf8; - par_low = par & 0x07; + par_low = par & 0x07; // 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] = par; ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; @@ -1901,10 +2080,10 @@ void ReaderMifare(uint32_t parameter) } nt_diff = (nt_diff + 1) & 0x07; - mf_nr_ar[3] = nt_diff << 5; + mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5); par = par_low; } else { - if (nt_diff == 0) + if (nt_diff == 0 && first_try) { par++; } else { @@ -1913,41 +2092,43 @@ void ReaderMifare(uint32_t parameter) } } - LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE); + 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); - UsbCommand ack = {CMD_ACK, {isOK, 0, 0}}; - memcpy(ack.d.asBytes + 0, uid, 4); - memcpy(ack.d.asBytes + 4, nt, 4); - memcpy(ack.d.asBytes + 8, par_list, 8); - memcpy(ack.d.asBytes + 16, ks_list, 8); + mf_nr_ar[3] &= 0x1F; + + byte_t buf[28]; + memcpy(buf + 0, uid, 4); + num_to_bytes(nt, 4, buf + 4); + memcpy(buf + 8, par_list, 8); + memcpy(buf + 16, ks_list, 8); + memcpy(buf + 24, mf_nr_ar, 4); - LED_B_ON(); - UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand)); - LED_B_OFF(); + cmd_send(CMD_ACK,isOK,0,0,buf,28); // Thats it... FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); tracing = TRUE; - - if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED"); } - -//----------------------------------------------------------------------------- -// MIFARE 1K simulate. -// -//----------------------------------------------------------------------------- -void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) +/** + *MIFARE 1K simulate. + * + *@param flags : + * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK + * 4B_FLAG_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that + * 7B_FLAG_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that + * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later + *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is inifite + */ +void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) { int cardSTATE = MFEMUL_NOFIELD; int _7BUID = 0; int vHf = 0; // in mV - //int nextCycleTimeout = 0; int res; -// uint32_t timer = 0; uint32_t selTimer = 0; uint32_t authTimer = 0; uint32_t par = 0; @@ -1955,7 +2136,6 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) uint8_t cardWRBL = 0; uint8_t cardAUTHSC = 0; uint8_t cardAUTHKEY = 0xff; // no authentication - //uint32_t cardRn = 0; uint32_t cardRr = 0; uint32_t cuid = 0; //uint32_t rn_enc = 0; @@ -1965,50 +2145,74 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) struct Crypto1State mpcs = {0, 0}; struct Crypto1State *pcs; pcs = &mpcs; - + uint32_t numReads = 0;//Counts numer of times reader read a block uint8_t* receivedCmd = eml_get_bigbufptr_recbuf(); uint8_t *response = eml_get_bigbufptr_sendbuf(); - static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID + uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID + uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; + uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!! + uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; + uint8_t rSAK1[] = {0x04, 0xda, 0x17}; - static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; - static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!! - - static uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; - static uint8_t rSAK1[] = {0x04, 0xda, 0x17}; + uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; + uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; - static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; -// static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f}; - static 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... + uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0}; + uint8_t ar_nr_collected = 0; // clear trace - traceLen = 0; + iso14a_clear_trace(); + tracing = true; // Authenticate response - nonce uint32_t nonce = bytes_to_num(rAUTH_NT, 4); - - // get UID from emul memory - emlGetMemBt(receivedCmd, 7, 1); - _7BUID = !(receivedCmd[0] == 0x00); - if (!_7BUID) { // ---------- 4BUID - rATQA[0] = 0x04; - emlGetMemBt(rUIDBCC1, 0, 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) + { + // 4B uid comes from data-portion of packet + memcpy(rUIDBCC1,datain,4); rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - } else { // ---------- 7BUID - rATQA[0] = 0x44; + }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 + { + // get UID from emul memory + emlGetMemBt(receivedCmd, 7, 1); + _7BUID = !(receivedCmd[0] == 0x00); + if (!_7BUID) { // ---------- 4BUID + emlGetMemBt(rUIDBCC1, 0, 4); + } else { // ---------- 7BUID + emlGetMemBt(&rUIDBCC1[1], 0, 3); + 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) + { + rATQA[0] = 0x44; rUIDBCC1[0] = 0x88; - emlGetMemBt(&rUIDBCC1[1], 0, 3); - rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - emlGetMemBt(rUIDBCC2, 3, 4); rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; } -// -------------------------------------- test area - -// -------------------------------------- END test area // start mkseconds counter StartCountUS(); @@ -2016,19 +2220,23 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) SetAdcMuxFor(GPIO_MUXSEL_HIPKD); FpgaSetupSsc(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); SpinDelay(200); - if (MF_DBGLEVEL >= 1) Dbprintf("Started. 7buid=%d", _7BUID); + 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]); + } + } // calibrate mkseconds counter GetDeltaCountUS(); - while (true) { + bool finished = false; + while (!BUTTON_PRESS() && !finished) { WDT_HIT(); - if(BUTTON_PRESS()) { - break; - } - // find reader field // Vref = 3300mV, and an 10:1 voltage divider on the input // can measure voltages up to 33000 mV @@ -2039,56 +2247,54 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) LED_A_ON(); } } + if(cardSTATE == MFEMUL_NOFIELD) continue; - if (cardSTATE != MFEMUL_NOFIELD) { - res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout) - if (res == 2) { - cardSTATE = MFEMUL_NOFIELD; - LEDsoff(); - continue; - } - if(res) break; - } - - //nextCycleTimeout = 0; - -// if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]); - - if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication - // 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(); - EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52)); - cardSTATE = MFEMUL_SELECT1; - - // init crypto block - LED_B_OFF(); - LED_C_OFF(); - crypto1_destroy(pcs); - cardAUTHKEY = 0xff; - } + //Now, get data + + res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout) + if (res == 2) { //Field is off! + cardSTATE = MFEMUL_NOFIELD; + LEDsoff(); + continue; + }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(); + EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52)); + cardSTATE = MFEMUL_SELECT1; + + // init crypto block + LED_B_OFF(); + LED_C_OFF(); + crypto1_destroy(pcs); + cardAUTHKEY = 0xff; + continue; } - + switch (cardSTATE) { - case MFEMUL_NOFIELD:{ - break; - } - case MFEMUL_HALTED:{ - break; - } + case MFEMUL_NOFIELD: + case MFEMUL_HALTED: case MFEMUL_IDLE:{ break; } case MFEMUL_SELECT1:{ // select all if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) { + if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL received"); EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1)); break; } + if (MF_DBGLEVEL >= 4 && len == 9 && receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 ) + { + Dbprintf("SELECT %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); + } // select card if (len == 9 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) { + if (!_7BUID) EmSendCmd(rSAK, sizeof(rSAK)); else @@ -2108,6 +2314,51 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) break; } + case MFEMUL_AUTH1:{ + if( len != 8) + { + cardSTATE_TO_IDLE(); + break; + } + uint32_t ar = bytes_to_num(receivedCmd, 4); + uint32_t nr= bytes_to_num(&receivedCmd[4], 4); + + //Collect AR/NR + if(ar_nr_collected < 2){ + 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++; + } + } + + // --- crypto + crypto1_word(pcs, ar , 1); + cardRr = nr ^ crypto1_word(pcs, 0, 0); + + // 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? + // Right now, we don't nack or anything, which causes the + // reader to do a WUPA after a while. /Martin + cardSTATE_TO_IDLE(); + break; + } + + ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); + + num_to_bytes(ans, 4, rAUTH_AT); + // --- crypto + 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); + break; + } case MFEMUL_SELECT2:{ if (!len) break; @@ -2131,86 +2382,44 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) // i guess there is a command). go into the work state. if (len != 4) break; cardSTATE = MFEMUL_WORK; - goto lbWORK; - } - case MFEMUL_AUTH1:{ - if (len == 8) { - // --- crypto - //rn_enc = bytes_to_num(receivedCmd, 4); - //cardRn = rn_enc ^ crypto1_word(pcs, rn_enc , 1); - cardRr = bytes_to_num(&receivedCmd[4], 4) ^ crypto1_word(pcs, 0, 0); - // test if auth OK - if (cardRr != prng_successor(nonce, 64)){ - if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x", cardRr, prng_successor(nonce, 64)); - cardSTATE_TO_IDLE(); - break; - } - ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); - num_to_bytes(ans, 4, rAUTH_AT); - // --- crypto - EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); - cardSTATE = MFEMUL_AUTH2; - } else { - cardSTATE_TO_IDLE(); - } - if (cardSTATE != MFEMUL_AUTH2) break; - } - case MFEMUL_AUTH2:{ - LED_C_ON(); - cardSTATE = MFEMUL_WORK; - if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer); - break; + //goto lbWORK; + //intentional fall-through to the next case-stmt } case MFEMUL_WORK:{ -lbWORK: if (len == 0) break; - - if (cardAUTHKEY == 0xff) { - // first authentication - if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { - authTimer = GetTickCount(); - - cardAUTHSC = receivedCmd[1] / 4; // received block num - cardAUTHKEY = receivedCmd[0] - 0x60; - - // --- crypto - crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); - ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); - num_to_bytes(nonce, 4, rAUTH_AT); - EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); - // --- crypto - -// last working revision -// EmSendCmd14443aRaw(resp1, resp1Len, 0); -// LogTrace(NULL, 0, GetDeltaCountUS(), 0, true); + if (len == 0) break; - cardSTATE = MFEMUL_AUTH1; - //nextCycleTimeout = 10; - break; - } - } else { + bool encrypted_data = (cardAUTHKEY != 0xFF) ; + + if(encrypted_data) + { // decrypt seqence mf_crypto1_decrypt(pcs, receivedCmd, len); - - // nested authentication - if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { - authTimer = GetTickCount(); + } - cardAUTHSC = receivedCmd[1] / 4; // received block num - cardAUTHKEY = receivedCmd[0] - 0x60; + if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { + authTimer = GetTickCount(); + cardAUTHSC = receivedCmd[1] / 4; // received block num + cardAUTHKEY = receivedCmd[0] - 0x60; + crypto1_destroy(pcs);//Added by martin + crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); - // --- crypto - crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); - ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); - num_to_bytes(ans, 4, rAUTH_AT); - EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); - // --- crypto + 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 ); - cardSTATE = MFEMUL_AUTH1; - //nextCycleTimeout = 10; - break; + 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); + num_to_bytes(ans, 4, rAUTH_AT); + } + EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); + //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]); + 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) { @@ -2224,39 +2433,63 @@ lbWORK: if (len == 0) break; break; } - // read block - if (len == 4 && receivedCmd[0] == 0x30) { - if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) { + if(len != 4) 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) + { + 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) + { + 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; + } + } + // read block + if (receivedCmd[0] == 0x30) { + if (MF_DBGLEVEL >= 2) { + Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]); + } emlGetMem(response, receivedCmd[1], 1); AppendCrc14443a(response, 16); mf_crypto1_encrypt(pcs, response, 18, &par); EmSendCmdPar(response, 18, par); + numReads++; + if(exitAfterNReads > 0 && numReads == exitAfterNReads) + { + Dbprintf("%d reads done, exiting", numReads); + finished = true; + } break; } - // write block - if (len == 4 && receivedCmd[0] == 0xA0) { - if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) { - EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - break; - } + if (receivedCmd[0] == 0xA0) { + if (MF_DBGLEVEL >= 2) 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; - } - - // works with cardINTREG - + } // increment, decrement, restore - if (len == 4 && (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2)) { - if (receivedCmd[1] >= 16 * 4 || - receivedCmd[1] / 4 != cardAUTHSC || - emlCheckValBl(receivedCmd[1])) { + 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 (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)); break; } @@ -2268,17 +2501,13 @@ lbWORK: if (len == 0) break; if (receivedCmd[0] == 0xC2) cardSTATE = MFEMUL_INTREG_REST; cardWRBL = receivedCmd[1]; - + break; } - // transfer - if (len == 4 && receivedCmd[0] == 0xB0) { - if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) { - EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - break; - } + if (receivedCmd[0] == 0xB0) { + if (MF_DBGLEVEL >= 2) 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)); @@ -2289,20 +2518,23 @@ lbWORK: if (len == 0) break; } // halt - if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) { + 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); break; } - - // command not allowed - if (len == 4) { + // RATS + if (receivedCmd[0] == 0xe0) {//RATS 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; } @@ -2364,10 +2596,43 @@ lbWORK: if (len == 0) break; // 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) + { + Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); + Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x", + ar_nr_responses[0], // UID + ar_nr_responses[1], //NT + ar_nr_responses[2], //AR1 + ar_nr_responses[3], //NR1 + ar_nr_responses[6], //AR2 + ar_nr_responses[7] //NR2 + ); + }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", + ar_nr_responses[0], // UID + ar_nr_responses[1], //NT + ar_nr_responses[2], //AR1 + ar_nr_responses[3] //NR1 + ); + } + } + } if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen); } + + //----------------------------------------------------------------------------- // MIFARE sniffer. // @@ -2484,7 +2749,7 @@ void RAMFUNC SniffMifare(uint8_t param) { Demod.state = DEMOD_UNSYNCD; } - if(ManchesterDecoding(data[0] & 0x0F)) { + if(ManchesterDecoding(data[0], 0)) { LED_C_INV(); if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; @@ -2512,4 +2777,4 @@ done: Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax); LEDsoff(); -} \ No newline at end of file +}