Add CCITT Kermit CRC check for FDX-B demod

[proxmark3-svn] / client / cmddata.c

diff --git a/client/cmddata.c b/client/cmddata.c
index dad0a71195311433f32686abc954cd1d1bb1b9e3..00caefd98c18b831ad991f9ed84b45dea86fe6cf 100644 (file)
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -23,6 +23,7 @@
 #include "lfdemod.h"
 #include "usb_cmd.h"
 #include "crc.h"
+#include "crc16.h"
 
 uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
 uint8_t g_debugMode;
@@ -1501,9 +1502,10 @@ int CmdFDXBdemodBI(const char *Cmd){
        if (g_debugMode) {
                char *bin = sprint_bin_break(BitStream,size,16);
                PrintAndLog("DEBUG BinStream:\n%s",bin);
+               PrintAndLog("0x%s", sprint_hex(BitStream,16));
        }
        PrintAndLog("\nFDX-B / ISO 11784/5 Animal Tag ID Found:");
-       if (g_debugMode) PrintAndLog("startmarker %d;   Size %d", preambleIndex, size);
+       if (g_debugMode) PrintAndLog("Start marker %d;   Size %d", preambleIndex, size);
 
        //return 1;
        //got a good demod
@@ -1515,14 +1517,22 @@ int CmdFDXBdemodBI(const char *Cmd){
        uint32_t crc16 = bytebits_to_byteLSBF(BitStream+64,16);
        uint32_t extended = bytebits_to_byteLSBF(BitStream+80,24);
 
+       uint64_t rawid = ((uint64_t)bytebits_to_byteLSBF(BitStream,32)<<32) | bytebits_to_byteLSBF(BitStream+32,32);
+       uint8_t raw[8];
+       num_to_bytes(rawid, 8, raw);
+       uint8_t *ID = SwapEndian64(raw, 8, 4);
+
+       if (g_debugMode) PrintAndLog("Raw ID Hex: %s", sprint_hex(ID,8));
+
+       uint16_t calcCrc = crc16_ccitt_kermit(ID, 8);
        PrintAndLog("Animal ID:     %u-%012llu", countryCode, NationalCode);
        PrintAndLog("National Code: %012llu", NationalCode);
        PrintAndLog("CountryCode:   %u", countryCode);
        PrintAndLog("Extended Data: %s", dataBlockBit ? "True" : "False");
        PrintAndLog("reserved Code: %u", reservedCode);
        PrintAndLog("Animal Tag:    %s", animalBit ? "True" : "False");
-       PrintAndLog("CRC:           0x%02X", crc16);
-       PrintAndLog("Extended:      0x%X", extended);
+       PrintAndLog("CRC:           0x%04X - [%04X] - %s", crc16, calcCrc, (calcCrc == crc16) ? "Passed" : "Failed");
+       PrintAndLog("Extended:      0x%X\n", extended);
        
        return 1;
 }