Merge pull request #289 from patrickdk77/master

[proxmark3-svn] / client / cmdlfsecurakey.c

diff --git a/client/cmdlfsecurakey.c b/client/cmdlfsecurakey.c
index 1d55faf91a6a08b9b96b0f13e78a5106f907ff98..8085eedc909ec3cb259567ff5d94aa8dd648967c 100644 (file)
--- a/client/cmdlfsecurakey.c
+++ b/client/cmdlfsecurakey.c
@@ -5,7 +5,7 @@
 // the license.
 //-----------------------------------------------------------------------------
 // Low frequency Securakey tag commands
-// ASK/Manchester, RF/40, 96 bits long
+// ASK/Manchester, RF/40, 96 bits long (unknown cs)
 //-----------------------------------------------------------------------------
 #include "cmdlfsecurakey.h"
 #include <string.h>
@@ -64,7 +64,7 @@ int CmdSecurakeyDemod(const char *Cmd) {
                return 0;
        }
        setDemodBuf(DemodBuffer, 96, ans);
-       //setGrid_Clock(40);
+       setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
 
        //got a good demod
        uint32_t raw1 = bytebits_to_byte(DemodBuffer   , 32);
@@ -83,33 +83,37 @@ int CmdSecurakeyDemod(const char *Cmd) {
        // y = card #
        // standard wiegand parities.
        // unknown checksum 11 bits? at the end
-       uint8_t bits_no_spacer[86];
-       memcpy(bits_no_spacer, DemodBuffer + 10, 86);
+       uint8_t bits_no_spacer[85];
+       memcpy(bits_no_spacer, DemodBuffer + 11, 85);
 
        // remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
-       size = removeParity(bits_no_spacer, 0, 9, 3, 86);
-       if ( size != 86-10 ) {
+       size = removeParity(bits_no_spacer, 0, 9, 3, 85);
+       if ( size != 85-9 ) {
                if (g_debugMode) PrintAndLog("DEBUG: Error removeParity: %d", size);
                return 0;
        }
 
-       uint8_t bitLen = (uint8_t)bytebits_to_byte(DemodBuffer+2, 6);
+       uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer+2, 6);
        uint32_t fc=0, lWiegand=0, rWiegand=0;
-       // get FC
+       if (bitLen > 40) { //securakey's max bitlen is 40 bits...
+               if (g_debugMode) PrintAndLog("DEBUG: Error bitLen too long: %u", bitLen);
+               return 0;
+       }
        // get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
-       lWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen, bitLen/2);
-       rWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen + bitLen/2, bitLen/2);
-       fc = bytebits_to_byte(DemodBuffer+49-bitLen, bitLen-2-16);
+       lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen/2);
+       rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen/2, bitLen/2);
+       // get FC
+       fc = bytebits_to_byte(bits_no_spacer+49-bitLen, bitLen-2-16);
 
        // test bitLen
        if (bitLen != 26 && bitLen != 32)
                PrintAndLog("***unknown securakey bitLen - share with forum***");
 
-       uint32_t cardid = bytebits_to_byte(DemodBuffer+8+23, 16);
-       // test parities
-       bool parity = evenparity32(lWiegand) && oddparity32(rWiegand);
+       uint32_t cardid = bytebits_to_byte(bits_no_spacer+8+23, 16);
+       // test parities - evenparity32 looks to add an even parity returns 0 if already even...
+       bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);
 
-       PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: %X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
+       PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
        if (bitLen <= 32)
                PrintAndLog("Wiegand: %08X, Parity: %s", (lWiegand<<(bitLen/2)) | rWiegand, parity ? "Passed" : "Failed");
        PrintAndLog("\nHow the FC translates to printed FC is unknown");
@@ -119,8 +123,7 @@ int CmdSecurakeyDemod(const char *Cmd) {
 }
 
 int CmdSecurakeyRead(const char *Cmd) {
-       CmdLFRead("s");
-       getSamples("8000",true);
+       lf_read(true, 8000);
        return CmdSecurakeyDemod(Cmd);
 }