X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/dd57061c11954b952ecc181d3857f94dc8d349a6..45095b01789279d8608a52c805a642e8b6a3ac7d:/armsrc/iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index bfbd7bf5..22227e74 100644
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -19,6 +19,9 @@
 #define RECEIVE_SAMPLES_TIMEOUT 2000
 #define ISO14443B_DMA_BUFFER_SIZE 256
 
+// PCB Block number for APDUs
+static uint8_t pcb_blocknum = 0;
+
 //=============================================================================
 // An ISO 14443 Type B tag. We listen for commands from the reader, using
 // a UART kind of thing that's implemented in software. When we get a
@@ -311,7 +314,7 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len)
 			}
 		}
 	}
-	
+
 	return FALSE;
 }
 
@@ -544,15 +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 { \
@@ -560,13 +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 { \
@@ -575,6 +583,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 			} \
 		} \
 	}
+		*/
 
 	switch(Demod.state) {
 		case DEMOD_UNSYNCD:
@@ -924,6 +933,98 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len)
 	}
 }
 
+/* Sends an APDU to the tag
+ * TODO: check CRC and preamble
+ */
+int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response)
+{
+	uint8_t message_frame[message_length + 4];
+	// PCB
+	message_frame[0] = 0x0A | pcb_blocknum;
+	pcb_blocknum ^= 1;
+	// CID
+	message_frame[1] = 0;
+	// INF
+	memcpy(message_frame + 2, message, message_length);
+	// EDC (CRC)
+	ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]);
+	// send
+	CodeAndTransmit14443bAsReader(message_frame, message_length + 4);
+	// get response
+	GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE);
+	if(Demod.len < 3)
+	{
+		return 0;
+	}
+	// TODO: Check CRC
+	// copy response contents
+	if(response != NULL)
+	{
+		memcpy(response, Demod.output, Demod.len);
+	}
+	return Demod.len;
+}
+
+/* Perform the ISO 14443 B Card Selection procedure
+ * Currently does NOT do any collision handling.
+ * It expects 0-1 cards in the device's range.
+ * TODO: Support multiple cards (perform anticollision)
+ * TODO: Verify CRC checksums
+ */
+int iso14443b_select_card()
+{
+	// WUPB command (including CRC)
+	// Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state
+	static const uint8_t wupb[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
+	// ATTRIB command (with space for CRC)
+	uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+
+	// first, wake up the tag
+	CodeAndTransmit14443bAsReader(wupb, sizeof(wupb));
+	GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+	// ATQB too short?
+	if (Demod.len < 14)
+	{
+		return 2;
+	}
+
+    // select the tag
+    // copy the PUPI to ATTRIB
+    memcpy(attrib + 1, Demod.output + 1, 4);
+    /* copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into
+    ATTRIB (Param 3) */
+    attrib[7] = Demod.output[10] & 0x0F;
+    ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10);
+    CodeAndTransmit14443bAsReader(attrib, sizeof(attrib));
+    GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+    // Answer to ATTRIB too short?
+    if(Demod.len < 3)
+	{
+		return 2;
+	}
+	// reset PCB block number
+	pcb_blocknum = 0;
+	return 1;
+}
+
+// Set up ISO 14443 Type B communication (similar to iso14443a_setup)
+void iso14443b_setup() {
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+	// Set up the synchronous serial port
+	FpgaSetupSsc();
+	// connect Demodulated Signal to ADC:
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+	// Signal field is on with the appropriate LED
+    LED_D_ON();
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
+
+	// Start the timer
+	StartCountSspClk();
+
+	DemodReset();
+	UartReset();
+}
 
 //-----------------------------------------------------------------------------
 // Read a SRI512 ISO 14443B tag.