Merge pull request #31 from dnet/patch-1

[proxmark3-svn] / armsrc / hitag2.c

diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index 05ac1f5e8e0a81258d4919c89a7ddd2f43795ddc..839240bd3d464d58269b589d5e340c609d19d77d 100644 (file)
--- a/armsrc/hitag2.c
+++ b/armsrc/hitag2.c
@@ -29,6 +29,30 @@ bool bAuthenticating;
 bool bPwd;
 bool bSuccessful;
 
+int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int bReader)
+{
+  // Return when trace is full
+  if (traceLen >= TRACE_SIZE) return FALSE;
+  
+  // Trace the random, i'm curious
+  rsamples += iSamples;
+  trace[traceLen++] = ((rsamples >> 0) & 0xff);
+  trace[traceLen++] = ((rsamples >> 8) & 0xff);
+  trace[traceLen++] = ((rsamples >> 16) & 0xff);
+  trace[traceLen++] = ((rsamples >> 24) & 0xff);
+  if (!bReader) {
+    trace[traceLen - 1] |= 0x80;
+  }
+  trace[traceLen++] = ((dwParity >> 0) & 0xff);
+  trace[traceLen++] = ((dwParity >> 8) & 0xff);
+  trace[traceLen++] = ((dwParity >> 16) & 0xff);
+  trace[traceLen++] = ((dwParity >> 24) & 0xff);
+  trace[traceLen++] = iBits;
+  memcpy(trace + traceLen, btBytes, nbytes(iBits));
+  traceLen += nbytes(iBits);
+  return TRUE;
+}
+
 struct hitag2_tag {
        uint32_t uid;
        enum {
@@ -153,10 +177,6 @@ static u32 _hitag2_byte (u64 * x)
        return c;
 }
 
-size_t nbytes(size_t nbits) {
-       return (nbits/8)+((nbits%8)>0);
-}
-
 int hitag2_reset(void)
 {
        tag.state = TAG_STATE_RESET;
@@ -399,8 +419,8 @@ void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, si
                break;
        }
 
-//     LogTrace(rx,nbytes(rxlen),0,0,false);
-//     LogTrace(tx,nbytes(*txlen),0,0,true);
+//     LogTraceHitag(rx,rxlen,0,0,false);
+//     LogTraceHitag(tx,*txlen,0,0,true);
        
        if(tag.crypto_active) {
                hitag2_cipher_transcrypt(&(tag.cs), tx, *txlen/8, *txlen%8);
@@ -531,12 +551,17 @@ bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
         } else {
           // Failed reading a block, could be (read/write) locked, skip block and re-authenticate
           if (blocknr == 1) {
+            // Write the low part of the key in memory
             memcpy(tag.sectors[1],key+2,4);
           } else if (blocknr == 2) {
+            // Write the high part of the key in memory
             tag.sectors[2][0] = 0x00;
             tag.sectors[2][1] = 0x00;
             tag.sectors[2][2] = key[0];
             tag.sectors[2][3] = key[1];
+          } else {
+            // Just put zero's in the memory (of the unreadable block)
+            memset(tag.sectors[blocknr],0x00,4);
           }
           blocknr++;
           bCrypto = false;
@@ -648,12 +673,19 @@ bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_
                case 0: {
                        // Stop if there is no answer while we are in crypto mode (after sending NrAr)
                        if (bCrypto) {
-                               Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]);
+                               Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed, removed entry!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]);
+
+        // Removing failed entry from authentiations table
+        memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8);
+        auth_table_len -= 8;
+
+        // Return if we reached the end of the authentiactions table
                                bCrypto = false;
-                               if ((auth_table_pos+8) == auth_table_len) {
+                               if (auth_table_pos == auth_table_len) {
                                        return false;
                                }
-                               auth_table_pos += 8;
+        
+        // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry)
                                memcpy(NrAr,auth_table+auth_table_pos,8);
                        }
                        *txlen = 5;
@@ -711,6 +743,7 @@ void SnoopHitag(uint32_t type) {
        
        // Set up eavesdropping mode, frequency divisor which will drive the FPGA
        // and analog mux selection.
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
@@ -848,7 +881,7 @@ void SnoopHitag(uint32_t type) {
                // Check if frame was captured
                if(rxlen > 0) {
                        frame_count++;
-                       if (!LogTrace(rx,nbytes(rxlen),response,0,reader_frame)) {
+                       if (!LogTraceHitag(rx,rxlen,response,0,reader_frame)) {
                                DbpString("Trace full");
                                break;
                        }
@@ -934,6 +967,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        
        // Set up simulator mode, frequency divisor which will drive the FPGA
        // and analog mux selection.
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
@@ -1011,7 +1045,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
                if(rxlen > 4) {
                        frame_count++;
                        if (!bQuiet) {
-                               if (!LogTrace(rx,nbytes(rxlen),response,0,true)) {
+                               if (!LogTraceHitag(rx,rxlen,response,0,true)) {
                                        DbpString("Trace full");
                                        if (bQuitTraceFull) {
                                                break;
@@ -1040,7 +1074,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
                                hitag_send_frame(tx,txlen);
                                // Store the frame in the trace
                                if (!bQuiet) {
-                                       if (!LogTrace(tx,nbytes(txlen),0,0,false)) {
+                                       if (!LogTraceHitag(tx,txlen,0,0,false)) {
                                                DbpString("Trace full");
                                                if (bQuitTraceFull) {
                                                        break;
@@ -1092,6 +1126,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
        bool bStop;
        bool bQuitTraceFull = false;
   
+  FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
   // Reset the return status
   bSuccessful = false;
   
@@ -1105,7 +1140,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                case RHT2F_PASSWORD: {
       Dbprintf("List identifier in password mode");
                        memcpy(password,htd->pwd.password,4);
-      blocknr = 0;
+               blocknr = 0;
                        bQuitTraceFull = false;
                        bQuiet = false;
                        bPwd = false;
@@ -1123,7 +1158,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
       
                case RHT2F_CRYPTO: {
                        DbpString("Authenticating using key:");
-                       memcpy(key,htd->crypto.key,6);
+                       memcpy(key,htd->crypto.key,4);
                        Dbhexdump(6,key,false);
       blocknr = 0;
                        bQuiet = false;
@@ -1221,7 +1256,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                if(rxlen > 0) {
                        frame_count++;
                        if (!bQuiet) {
-                               if (!LogTrace(rx,nbytes(rxlen),response,0,false)) {
+                               if (!LogTraceHitag(rx,rxlen,response,0,false)) {
                                        DbpString("Trace full");
                                        if (bQuitTraceFull) {
                                                break;
@@ -1275,7 +1310,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                        frame_count++;
                        if (!bQuiet) {
                                // Store the frame in the trace
-                               if (!LogTrace(tx,nbytes(txlen),HITAG_T_WAIT_2,0,true)) {
+                               if (!LogTraceHitag(tx,txlen,HITAG_T_WAIT_2,0,true)) {
                                        if (bQuitTraceFull) {
                                                break;
                                        } else {