X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b62a5a8444db6dcfad2b491f3283f43378c630cf..c805748f340391011d647f7f524d1744563ddec1:/armsrc/mifaresniff.c

diff --git a/armsrc/mifaresniff.c b/armsrc/mifaresniff.c
index 25c7780d..59203478 100644
--- a/armsrc/mifaresniff.c
+++ b/armsrc/mifaresniff.c
@@ -11,5 +11,179 @@
 #include "mifaresniff.h"
 #include "apps.h"
 
+static int sniffState = SNF_INIT;
+static uint8_t sniffUIDType = 0;
+static uint8_t sniffUID[10] = {0,0,0,0,0,0,0,0,0,0};
+static uint8_t sniffATQA[2] = {0,0};
+static uint8_t sniffSAK = 0;
+static uint8_t sniffBuf[19];
+static uint32_t timerData = 0;
 
 
+void MfSniffInit(void){
+	memset(sniffUID, 0x00, sizeof(sniffUID));
+	memset(sniffATQA, 0x00, sizeof(sniffATQA));
+	memset(sniffBuf, 0x00, sizeof(sniffBuf));
+	sniffSAK = 0;
+	sniffUIDType = SNF_UID_4;
+}
+
+void MfSniffEnd(void){
+	LED_B_ON();
+	cmd_send(CMD_ACK,0,0,0,0,0);
+	LED_B_OFF();
+}
+
+bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {
+
+	// reset on 7-Bit commands from reader
+	if (reader && (len == 1) && (bitCnt == 7)) { 		
+		sniffState = SNF_INIT;
+	}
+
+	switch (sniffState) {
+		case SNF_INIT:{
+			// REQA or WUPA from reader
+			if ((len == 1) && (reader) && (bitCnt == 7) ) {
+				MfSniffInit();
+				sniffState = SNF_WUPREQ;
+			}
+			break;
+		}
+		case SNF_WUPREQ:{
+			// ATQA from tag
+			if ((!reader) && (len == 2)) {
+				sniffATQA[0] = data[0];
+				sniffATQA[1] = data[1];
+				sniffState = SNF_ATQA;
+			}
+			break;
+		}
+		case SNF_ATQA:{
+			// Select ALL from reader
+			if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) {
+				sniffState = SNF_ANTICOL1;
+			}
+			break;
+		}
+		case SNF_ANTICOL1:{
+			// UID from tag (CL1) 
+			if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
+				memcpy(sniffUID + 3, data, 4);
+				sniffState = SNF_UID1;
+			}
+			break;
+		}
+		case SNF_UID1:{
+			// Select 4 Byte UID from reader
+			if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
+				sniffState = SNF_SAK;
+			}
+			break;
+		}
+		case SNF_SAK:{
+			if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
+				sniffSAK = data[0];
+				if (sniffUID[3] == 0x88) {			// CL2 UID part to be expected
+					sniffState = SNF_ANTICOL2;
+				} else {							// select completed
+					sniffState = SNF_CARD_IDLE;
+				}
+			}
+			break;
+		}
+		case SNF_ANTICOL2:{
+			 // CL2 UID 
+			if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
+				memcpy(sniffUID, sniffUID+4, 3);
+				memcpy(sniffUID+3, data, 4);
+				sniffUIDType = SNF_UID_7;
+				sniffState = SNF_UID2;
+			}
+			break;
+		}
+		case SNF_UID2:{
+			// Select 2nd part of 7 Byte UID
+			if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
+				sniffState = SNF_SAK;
+			}
+			break;
+		}
+		case SNF_ANTICOL3:{
+			// CL3 UID 
+			if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { 
+				memcpy(sniffUID, sniffUID+4, 3);
+				memcpy(sniffUID+3, data, 4);
+				sniffUIDType = SNF_UID_10;
+				sniffState = SNF_UID3;
+			}
+			break;
+		}
+		case SNF_UID3:{
+			// Select 3nd part of 10 Byte UID
+			if ((reader) && (len == 9) && (data[0] == 0x97) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
+				sniffState = SNF_SAK;
+			}
+			break;
+		}
+		case SNF_CARD_IDLE:{	// trace the card select sequence
+			sniffBuf[0] = 0xFF;
+			sniffBuf[1] = 0xFF;
+			memcpy(sniffBuf + 2, sniffUID, sizeof(sniffUID));
+			memcpy(sniffBuf + 9, sniffATQA, sizeof(sniffATQA));
+			sniffBuf[14] = sniffSAK;
+			sniffBuf[15] = 0xFF;
+			sniffBuf[16] = 0xFF;
+			LogTrace(sniffBuf, sizeof(sniffBuf), 0, 0, NULL, TRUE);
+		}	// intentionally no break;
+		case SNF_CARD_CMD:{		
+			LogTrace(data, len, 0, 0, NULL, TRUE);
+			sniffState = SNF_CARD_RESP;
+			timerData = GetTickCount();
+			break;
+		}
+		case SNF_CARD_RESP:{
+			LogTrace(data, len, 0, 0, NULL, FALSE);
+			sniffState = SNF_CARD_CMD;
+			timerData = GetTickCount();
+			break;
+		}
+		default:
+			sniffState = SNF_INIT;
+		break;
+	}
+	return FALSE;
+}
+
+bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
+	if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
+		return intMfSniffSend();
+	}
+	return FALSE;
+}
+
+// internal sending function. not a RAMFUNC.
+bool intMfSniffSend() {
+
+	int pckSize = 0;
+	int pckLen = BigBuf_get_traceLen();
+	int pckNum = 0;
+	uint8_t *trace = BigBuf_get_addr();
+	
+	FpgaDisableSscDma();
+	while (pckLen > 0) {
+		pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
+		LED_B_ON();
+		cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
+		LED_B_OFF();
+		pckLen -= pckSize;
+		pckNum++;
+	}
+
+	LED_B_ON();
+	cmd_send(CMD_ACK,2,0,0,0,0);
+	LED_B_OFF();
+
+	clear_trace();
+	return TRUE;
+}