X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/fc8c5cdd12428f39dbb67b7e744b2dfdd59b5f23..42daa759c16328607aff6ab35ef97656ad2050da:/armsrc/hitag2.c

diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index 05ac1f5e..1a0e9b56 100644
--- 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;
@@ -848,7 +880,7 @@ 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;
 			}
@@ -1011,7 +1043,7 @@ 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 +1072,7 @@ 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;
@@ -1221,7 +1253,7 @@ 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 +1307,7 @@ 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 {