iClass full simulation of tags now officially works, with some cheating regarding...

[proxmark3-svn] / armsrc / iclass.c

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index f289d24e5641721c40c69bea5b0edadd315e9224..260e6a6033f7f736173c0558ee8c034366f05434 100644 (file)
--- 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
@@ -1071,18 +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]);
 
-       //The diversified key should be stored on block 3
        uint8_t diversified_key[8] = { 0 };
-       //Get the diversified key from emulator memory
-       memcpy(diversified_key, emulator+(8*3),8);
        // 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
-               opt_doTagMAC_1(card_challenge_data,diversified_key);
+               cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key);
+
        }
 
        int exitLoop = 0;
@@ -1142,9 +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);
@@ -1164,9 +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..
@@ -1218,6 +1226,7 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
                                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
@@ -1249,8 +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;
@@ -1288,7 +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();
                }