Merge pull request #38 from marshmellow42/master

[proxmark3-svn] / armsrc / hitag2.c

diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index 37c2e3eb41aa17188a7fdb606a39a34cb28824df..27a5d50851d04bb57c24b98cf43db2817482f101 100644 (file)
--- a/armsrc/hitag2.c
+++ b/armsrc/hitag2.c
@@ -29,10 +29,6 @@ bool bAuthenticating;
 bool bPwd;
 bool bSuccessful;
 
-size_t nbytes(size_t nbits) {
-       return (nbits/8)+((nbits%8)>0);
-}
-
 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int bReader)
 {
   // Return when trace is full
@@ -677,12 +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;
@@ -740,6 +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);
@@ -963,6 +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);
@@ -985,18 +990,18 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
   // Disable timer during configuration        
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
 
-       // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger,
+       // Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger,
        // external trigger rising edge, load RA on rising edge of TIOA.
        AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_RISING | AT91C_TC_ABETRG | AT91C_TC_LDRA_RISING;
        
-       // Enable and reset counter
-       AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
-
        // Reset the received frame, frame count and timing info
        memset(rx,0x00,sizeof(rx));
        frame_count = 0;
        response = 0;
        overflow = 0;
+
+       // Enable and reset counter
+       AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
        
        while(!BUTTON_PRESS()) {
                // Watchdog hit
@@ -1100,9 +1105,9 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-//     Dbprintf("frame received: %d",frame_count);
-//     Dbprintf("Authentication Attempts: %d",(auth_table_len/8));
-//     DbpString("All done");
+       
+       DbpString("Sim Stopped");
+       
 }
 
 void ReaderHitag(hitag_function htf, hitag_data* htd) {
@@ -1121,6 +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;
   
@@ -1134,7 +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;
@@ -1152,7 +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);    //HACK; 4 or 6??  I read both in the code.
                        Dbhexdump(6,key,false);
       blocknr = 0;
                        bQuiet = false;