X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b19caaefc277335ed623e0a3b6c80be31fce439c..58e93ff593ee67e1c41fa790110dc60f09b91cc4:/armsrc/iclass.c diff --git a/armsrc/iclass.c b/armsrc/iclass.c index 81ecd01b..260e6a60 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -47,8 +47,9 @@ // different initial value (CRC_ICLASS) #include "iso14443crc.h" #include "iso15693tools.h" -#include "cipher.h" #include "protocols.h" +#include "optimized_cipher.h" + static int timeout = 4096; @@ -1041,6 +1042,10 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain Dbprintf("Done..."); } +void AppendCrc(uint8_t* data, int len) +{ + ComputeCrc14443(CRC_ICLASS,data,len,data+len,data+len+1); +} /** * @brief Does the actual simulation @@ -1052,6 +1057,8 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) // free eventually allocated BigBuf memory BigBuf_free_keep_EM(); + State cipher_state; +// State cipher_state_reserve; uint8_t *csn = BigBuf_get_EM_addr(); uint8_t *emulator = csn; uint8_t sof_data[] = { 0x0F} ; @@ -1068,12 +1075,20 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]); ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]); + uint8_t diversified_key[8] = { 0 }; // e-Purse uint8_t card_challenge_data[8] = { 0x00 }; if(simulationMode == MODE_FULLSIM) { + //The diversified key should be stored on block 3 + //Get the diversified key from emulator memory + memcpy(diversified_key, emulator+(8*3),8); + //Card challenge, a.k.a e-purse is on block 2 memcpy(card_challenge_data,emulator + (8 * 2) , 8); + //Precalculate the cipher state, feeding it the CC + cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key); + } int exitLoop = 0; @@ -1133,9 +1148,11 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax; //This is used for responding to READ-block commands or other data which is dynamically generated - uint8_t *data_response = BigBuf_malloc(8 * 2 + 2); - //This is used for responding to READ-block commands or other data which is dynamically generated - uint8_t *data_generic_trace = BigBuf_malloc(8 * 2 + 2); + //First the 'trace'-data, not encoded for FPGA + uint8_t *data_generic_trace = BigBuf_malloc(8 + 2);//8 bytes data + 2byte CRC is max tag answer + //Then storage for the modulated data + //Each bit is doubled when modulated for FPGA, and we also have SOF and EOF (2 bytes) + uint8_t *data_response = BigBuf_malloc( (8+2) * 2 + 2); // Start from off (no field generated) //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); @@ -1155,9 +1172,9 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) LED_A_ON(); bool buttonPressed = false; - + uint8_t response_delay = 1; while(!exitLoop) { - + response_delay = 1; LED_B_OFF(); //Signal tracer // Can be used to get a trigger for an oscilloscope.. @@ -1199,27 +1216,18 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) } else if(receivedCmd[0] == ICLASS_CMD_CHECK) { // Reader random and reader MAC!!! if(simulationMode == MODE_FULLSIM) - { //This is what we must do.. - //Reader just sent us NR and MAC(k,cc * nr) - //The diversified key should be stored on block 3 - //However, from a typical dump, the key will not be there - uint8_t diversified_key[8] = { 0 }; - - //Get the diversified key from emulator memory - memcpy(diversified_key, emulator+(8*3),8); - uint8_t ccnr[12] = { 0 }; - //Put our cc there (block 2) - memcpy(ccnr, emulator + (8 * 2), 8); - //Put nr there - memcpy(ccnr+8, receivedCmd+1,4); - //Now, calc MAC - doMAC(ccnr,diversified_key, data_generic_trace); + { + //NR, from reader, is in receivedCmd +1 + opt_doTagMAC_2(cipher_state,receivedCmd+1,data_generic_trace,diversified_key); + trace_data = data_generic_trace; trace_data_size = 4; CodeIClassTagAnswer(trace_data , trace_data_size); memcpy(data_response, ToSend, ToSendMax); modulated_response = data_response; modulated_response_size = ToSendMax; + response_delay = 0;//We need to hurry here... + //exitLoop = true; }else { //Not fullsim, we don't respond // We do not know what to answer, so lets keep quiet @@ -1250,8 +1258,28 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) } else if(simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4){ //Read block uint16_t blk = receivedCmd[1]; - trace_data = emulator+(blk << 3); - trace_data_size = 8; + //Take the data... + memcpy(data_generic_trace, emulator+(blk << 3),8); + //Add crc + AppendCrc(data_generic_trace, 8); + trace_data = data_generic_trace; + trace_data_size = 10; + CodeIClassTagAnswer(trace_data , trace_data_size); + memcpy(data_response, ToSend, ToSendMax); + modulated_response = data_response; + modulated_response_size = ToSendMax; + }else if(receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM) + {//Probably the reader wants to update the nonce. Let's just ignore that for now. + // OBS! If this is implemented, don't forget to regenerate the cipher_state + //We're expected to respond with the data+crc, exactly what's already in the receivedcmd + //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b| + + //Take the data... + memcpy(data_generic_trace, receivedCmd+2,8); + //Add crc + AppendCrc(data_generic_trace, 8); + trace_data = data_generic_trace; + trace_data_size = 10; CodeIClassTagAnswer(trace_data , trace_data_size); memcpy(data_response, ToSend, ToSendMax); modulated_response = data_response; @@ -1289,7 +1317,7 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) A legit tag has about 380us delay between reader EOT and tag SOF. **/ if(modulated_response_size > 0) { - SendIClassAnswer(modulated_response, modulated_response_size, 1); + SendIClassAnswer(modulated_response, modulated_response_size, response_delay); t2r_time = GetCountSspClk(); }