@frederikmoellers EPA changes, with APDU for ISO14443b support

[proxmark3-svn] / armsrc / iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index db7f7539e31488c570051ae6fbcb08e965a23735..250be30fabd5f5fbba5265f9717efc081600d985 100644 (file)
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -16,10 +16,13 @@
 
 #include "iso14443crc.h"
 
-#define RECEIVE_SAMPLES_TIMEOUT 200000
-#define ISO14443B_DMA_BUFFER_SIZE 512
+#define RECEIVE_SAMPLES_TIMEOUT 0x0003FFFF
+#define ISO14443B_DMA_BUFFER_SIZE 256
 
 uint8_t PowerOn = TRUE;
+// 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
@@ -636,6 +639,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
                                if(Demod.posCount < 10*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
                                        Demod.state = DEMOD_UNSYNCD;
                                } else {
+                                       LED_C_ON(); // Got SOF
                                        Demod.state = DEMOD_AWAITING_START_BIT;
                                        Demod.posCount = 0;
                                        Demod.len = 0;
@@ -693,7 +697,6 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 
                                Demod.bitCount++;
                                if(Demod.bitCount == 10) {
-                                       LED_C_ON();
                                        uint16_t s = Demod.shiftReg;
                                        if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0'
                                                uint8_t b = (s >> 1);
@@ -809,7 +812,7 @@ static void GetSamplesFor14443bDemod(int n, bool quiet)
 
        AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
 
-       if (!quiet) {
+       if (!quiet && Demod.len == 0) {
                Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d",
                        max,
                        samples, 
@@ -837,6 +840,9 @@ static void TransmitFor14443b(void)
 
        FpgaSetupSsc();
 
+       // Start the timer
+       StartCountSspClk();
+       
        while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                AT91C_BASE_SSC->SSC_THR = 0xff;
        }
@@ -950,6 +956,99 @@ 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);
+       BigBuf_free();
+       // 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.
@@ -1252,12 +1351,19 @@ void RAMFUNC SnoopIso14443b(void)
  */
 void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[])
 {
+       iso14443b_setup();
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        BigBuf_free();
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        if ( !PowerOn ){
                FpgaSetupSsc();
        }
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       
+       // Start the timer
+       StartCountSspClk();
+
+       DemodReset();
+       UartReset();
        
        if ( datalen == 0 && recv == 0 && powerfield == 0){
                clear_trace();