From c8387e85e39182527d30317efa127642ddfe5d79 Mon Sep 17 00:00:00 2001 From: Martin Holst Swende Date: Mon, 2 Mar 2015 21:30:22 +0100 Subject: [PATCH 1/1] iClass full simulation of tags now officially works, with some cheating regarding reader update and write commands --- armsrc/iclass.c | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-) diff --git a/armsrc/iclass.c b/armsrc/iclass.c index 4d847909..260e6a60 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -1042,6 +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 @@ -1144,9 +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); @@ -1252,8 +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; -- 2.39.5