X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a704cbe89dddc7504705a6e8fe5ab47afb92fa88..a386043fa9d1bbe2bb981be940d34e2372671f3e:/armsrc/iso14443b.c?ds=sidebyside

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index f8e6046c..22227e74 100644
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -324,10 +324,14 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len)
 //-----------------------------------------------------------------------------
 void SimulateIso14443bTag(void)
 {
-	// the only commands we understand is REQB, AFI=0, Select All, N=0:
-	static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
-	// ... and REQB, AFI=0, Normal Request, N=0:
-	static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF };
+	// the only commands we understand is WUPB, AFI=0, Select All, N=1:
+	static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB
+	// ... and REQB, AFI=0, Normal Request, N=1:
+	static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB
+	// ... and HLTB
+	static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB
+	// ... and ATTRIB
+	static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
 
 	// ... and we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922,
 	// supports only 106kBit/s in both directions, max frame size = 32Bytes,
@@ -336,6 +340,9 @@ void SimulateIso14443bTag(void)
 		0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22,
 		0x00, 0x21, 0x85, 0x5e, 0xd7
 	};
+	// response to HLTB and ATTRIB
+	static const uint8_t response2[] = {0x00, 0x78, 0xF0};
+
 
 	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
@@ -359,6 +366,12 @@ void SimulateIso14443bTag(void)
 	memcpy(resp1Code, ToSend, ToSendMax);
 	uint16_t resp1CodeLen = ToSendMax;
 
+	// prepare the (other) tag answer:
+	CodeIso14443bAsTag(response2, sizeof(response2));
+	uint8_t *resp2Code = BigBuf_malloc(ToSendMax);
+	memcpy(resp2Code, ToSend, ToSendMax);
+	uint16_t resp2CodeLen = ToSendMax;
+
 	// We need to listen to the high-frequency, peak-detected path.
 	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 	FpgaSetupSsc();
@@ -384,18 +397,33 @@ void SimulateIso14443bTag(void)
 			respLen = sizeof(response1);
 			respCode = resp1Code;
 			respCodeLen = resp1CodeLen;
+		} else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0])
+			|| (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) {
+			resp = response2;
+			respLen = sizeof(response2);
+			respCode = resp2Code;
+			respCodeLen = resp2CodeLen;
 		} else {
 			Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
 			// And print whether the CRC fails, just for good measure
 			uint8_t b1, b2;
-			ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
-			if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
-				// Not so good, try again.
-				DbpString("+++CRC fail");
-			} else {
-				DbpString("CRC passes");
+			if (len >= 3){ // if crc exists
+				ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
+				if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
+					// Not so good, try again.
+					DbpString("+++CRC fail");
+		
+				} else {
+					DbpString("CRC passes");
+				}
 			}
-			break;
+			//get rid of compiler warning
+			respCodeLen = 0;
+			resp = response1;
+			respLen	= 0;
+			respCode = resp1Code;
+			//don't crash at new command just wait and see if reader will send other new cmds.
+			//break;
 		}
 
 		cmdsRecvd++;
@@ -519,15 +547,20 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 	}
  */
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
+
+	//note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
 #define CHECK_FOR_SUBCARRIER() { \
+		v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \
+ 	}
+		/*
 		if(ci < 0) { \
-			if(cq < 0) { /* ci < 0, cq < 0 */ \
+			if(cq < 0) { \ // ci < 0, cq < 0
 				if (cq < ci) { \
 					v = -cq - (ci >> 1); \
 				} else { \
 					v = -ci - (cq >> 1); \
 				} \
-			} else {	/* ci < 0, cq >= 0 */ \
+			} else {	\ // ci < 0, cq >= 0
 				if (cq < -ci) { \
 					v = -ci + (cq >> 1); \
 				} else { \
@@ -535,13 +568,13 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 				} \
 			} \
 		} else { \
-			if(cq < 0) { /* ci >= 0, cq < 0 */ \
+			if(cq < 0) { \ // ci >= 0, cq < 0
 				if (-cq < ci) { \
 					v = ci - (cq >> 1); \
 				} else { \
 					v = -cq + (ci >> 1); \
 				} \
-			} else {	/* ci >= 0, cq >= 0 */ \
+			} else {	\ // ci >= 0, cq >= 0
 				if (cq < ci) { \
 					v = ci + (cq >> 1); \
 				} else { \
@@ -550,6 +583,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 			} \
 		} \
 	}
+		*/
 
 	switch(Demod.state) {
 		case DEMOD_UNSYNCD:
@@ -1295,14 +1329,16 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u
 	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 	FpgaSetupSsc();
 
-	set_tracing(TRUE);
-
-	CodeAndTransmit14443bAsReader(data, datalen);
+	if (datalen){
+		set_tracing(TRUE);
+		
+		CodeAndTransmit14443bAsReader(data, datalen);
 
-	if(recv) {
-		GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-		uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
-		cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+		if(recv) {
+			GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+			uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
+			cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+		}
 	}
 
 	if(!powerfield) {