X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3375daee9ec98977c69ef19ac1f14317bfdd80d9..966c111e8c8e45e624465502d0ee405ebda9a39c:/client/cmdlfvisa2000.c

diff --git a/client/cmdlfvisa2000.c b/client/cmdlfvisa2000.c
index 9148a435..e828f374 100644
--- a/client/cmdlfvisa2000.c
+++ b/client/cmdlfvisa2000.c
@@ -45,13 +45,51 @@ static uint8_t visa_chksum( uint32_t id ) {
     return sum & 0xF;
 }
 
+static uint8_t visa_parity( uint32_t id) {
+	// 4bit parity LUT
+	uint8_t par_lut[] = {
+		0,1,1,0
+		,1,0,0,1
+		,1,0,0,1
+		,0,1,1,0
+	};	
+	uint8_t par = 0;
+	par |= par_lut[ NIBBLE_HIGH( (id >> 24) & 0xFF) ] << 7;
+	par |= par_lut[ NIBBLE_LOW( (id >> 24) & 0xFF) ] << 6;
+	par |= par_lut[ NIBBLE_HIGH( (id >> 16) & 0xFF) ] << 5;
+	par |= par_lut[ NIBBLE_LOW( (id >> 16) & 0xFF) ] << 4;
+	par |= par_lut[ NIBBLE_HIGH( (id >> 8) & 0xFF) ] << 3;
+	par |= par_lut[ NIBBLE_LOW( (id >> 8) & 0xFF) ] << 2;
+	par |= par_lut[ NIBBLE_HIGH( id & 0xFF ) ] << 1;
+	par |= par_lut[ NIBBLE_LOW( id & 0xFF) ];
+	return par;	
+}
+
+
+/**
+*
+* 56495332 00096ebd 00000077 —> tag id 618173
+* aaaaaaaa iiiiiiii -----..c
+*
+* a = fixed value  ascii 'VIS2'
+* i = card id
+* c = checksum  (xor of card id)
+* . = unknown 
+* 
+**/
 //see ASKDemod for what args are accepted
 int CmdVisa2kDemod(const char *Cmd) {
 
+	// save GraphBuffer - to restore it later	
+	save_restoreGB(1);
+	
+	//sCmdAskEdgeDetect("");
+	
 	//ASK / Manchester
 	bool st = TRUE;
 	if (!ASKDemod_ext("64 0 0", FALSE, FALSE, 1, &st)) {
 		if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
+		save_restoreGB(0);
 		return 0;
 	}
 	size_t size = DemodBufferLen;
@@ -67,38 +105,51 @@ int CmdVisa2kDemod(const char *Cmd) {
 			else
 				PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
 		}
+		save_restoreGB(0);
 		return 0;
 	}
 	setDemodBuf(DemodBuffer, 96, ans);
-	
+	setGrid_Clock(64);
+		
 	//got a good demod
 	uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
 	uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
 	uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
-
+	
 	// chksum
 	uint8_t calc = visa_chksum(raw2);
 	uint8_t chk = raw3 & 0xF;	
+		
 	// test checksums
 	if ( chk != calc ) { 
 		printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
+		save_restoreGB(0);
 		return 0;
 	}
+	// parity
+	uint8_t calc_par = visa_parity(raw2);
+	uint8_t chk_par = (raw3 & 0xFF0) >> 4;
+	if ( calc_par != chk_par) {
+		printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
+		save_restoreGB(0);
+		return 0;		
+	}
 	PrintAndLog("Visa2000 Tag Found: Card ID %u,  Raw: %08X%08X%08X", raw2,  raw1 ,raw2, raw3);
-
+	save_restoreGB(0);
 	return 1;
 }
 
+// 64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
 int CmdVisa2kRead(const char *Cmd) {
 	CmdLFRead("s");
-	getSamples("20000",TRUE);
+	getSamples("12500",TRUE);
 	return CmdVisa2kDemod(Cmd);
 }
 
 int CmdVisa2kClone(const char *Cmd) {
 
 	uint64_t id = 0;
-	uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR |3<<T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
+	uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
 
 	char cmdp = param_getchar(Cmd, 0);
 	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
@@ -108,18 +159,18 @@ int CmdVisa2kClone(const char *Cmd) {
 	//Q5
 	if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
 		//t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
-		blocks[0] = T5555_MODULATION_MANCHESTER | 64<<T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3<<T5555_MAXBLOCK_SHIFT;
+		blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
 	}
 	
 	// 
 	blocks[2] = id;
-	blocks[3] = visa_chksum( id);
+	blocks[3] =  (visa_parity(id) << 4) | visa_chksum(id);	
 
 	PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
 	PrintAndLog("Blk | Data ");
 	PrintAndLog("----+------------");
 	for(int i = 0; i<4; ++i)
-	PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
+		PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
 	
 	UsbCommand resp;
 	UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
@@ -129,7 +180,7 @@ int CmdVisa2kClone(const char *Cmd) {
 		c.arg[1] = i;
 		clearCommandBuffer();
 		SendCommand(&c);
-		if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
+		if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
 			PrintAndLog("Error occurred, device did not respond during write operation.");
 			return -1;
 		}
@@ -155,9 +206,9 @@ int CmdVisa2kSim(const char *Cmd) {
 
 	UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 
-	uint32_t blocks[3] = { BL0CK1, id,  visa_chksum(id) };
+	uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
 
-	for(int i=0; i<3; ++i)
+	for(int i = 0; i < 3; ++i)
 		num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
 
 	clearCommandBuffer();
@@ -167,6 +218,7 @@ int CmdVisa2kSim(const char *Cmd) {
 
 static command_t CommandTable[] = {
     {"help",	CmdHelp,		1, "This help"},
+	{"demod",	CmdVisa2kDemod,	1, "Attempt to demod from GraphBuffer"},	
 	{"read",	CmdVisa2kRead,	0, "Attempt to read and extract tag data"},
 	{"clone",	CmdVisa2kClone,	0, "clone Visa2000 tag"},
 	{"sim",		CmdVisa2kSim,	0, "simulate Visa2000 tag"},