// Gerhard de Koning Gans - May 2008
// Hagen Fritsch - June 2010
// Gerhard de Koning Gans - May 2011
+// Gerhard de Koning Gans - June 2012 - Added iClass card and reader emulation
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// Please feel free to contribute and extend iClass support!!
//-----------------------------------------------------------------------------
//
-// TODO:
-// =====
-// - iClass emulation
-// - reader emulation
-//
// FIX:
// ====
// We still have sometimes a demodulation error when snooping iClass communication.
#include "apps.h"
#include "util.h"
#include "string.h"
+#include "common.h"
+// Needed for CRC in emulation mode;
+// same construction as in ISO 14443;
+// different initial value (CRC_ICLASS)
+#include "iso14443crc.h"
+
+static int timeout = 4096;
-#include "iclass.h"
-
-static uint8_t *trace = (uint8_t *) BigBuf;
-static int traceLen = 0;
-static int rsamples = 0;
-
-// CARD TO READER
-// Sequence D: 11110000 modulation with subcarrier during first half
-// Sequence E: 00001111 modulation with subcarrier during second half
-// Sequence F: 00000000 no modulation with subcarrier
-// READER TO CARD
-// Sequence X: 00001100 drop after half a period
-// Sequence Y: 00000000 no drop
-// Sequence Z: 11000000 drop at start
-#define SEC_D 0xf0
-#define SEC_E 0x0f
-#define SEC_F 0x00
-#define SEC_X 0x0c
-#define SEC_Y 0x00
-#define SEC_Z 0xc0
-
-static const uint8_t OddByteParity[256] = {
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
-};
-
-//static const uint8_t MajorityNibble[16] = { 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1 };
-//static const uint8_t MajorityNibble[16] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
-
-// BIG CHANGE - UNDERSTAND THIS BEFORE WE COMMIT
-#define RECV_CMD_OFFSET 3032
-#define RECV_RES_OFFSET 3096
-#define DMA_BUFFER_OFFSET 3160
-#define DMA_BUFFER_SIZE 4096
-#define TRACE_LENGTH 3000
+static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
//-----------------------------------------------------------------------------
// The software UART that receives commands from the reader, and its state
int nOutOfCnt;
int OutOfCnt;
int syncBit;
- int parityBits;
- int samples;
+ int parityBits;
+ int samples;
int highCnt;
int swapper;
int counter;
uint8_t *output;
} Uart;
-static RAMFUNC int MillerDecoding(int bit)
+static RAMFUNC int OutOfNDecoding(int bit)
{
- int error = 0;
+ //int error = 0;
int bitright;
if(!Uart.bitBuffer) {
// When not part of SOF or EOF, it is an error
Uart.state = STATE_UNSYNCD;
Uart.highCnt = 0;
- error = 4;
+ //error = 4;
}
}
}
if(!bit) {
if(Uart.dropPosition) {
if(Uart.state == STATE_START_OF_COMMUNICATION) {
- error = 1;
+ //error = 1;
}
else {
- error = 7;
+ //error = 7;
}
// It is an error if we already have seen a drop in current frame
Uart.state = STATE_UNSYNCD;
if(!Uart.dropPosition) {
Uart.state = STATE_UNSYNCD;
Uart.highCnt = 0;
- error = 9;
+ //error = 9;
}
else {
Uart.shiftReg >>= 2;
if(!Uart.dropPosition) {
Uart.state = STATE_UNSYNCD;
Uart.highCnt = 0;
- error = 3;
+ //error = 3;
}
else {
Uart.dropPosition--;
Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
Uart.dropPosition = 0;
Uart.shiftReg = 0;
- error = 0;
+ //error = 0;
}
else {
Uart.highCnt = 0;
}
//=============================================================================
-// ISO 14443 Type A - Manchester
+// Manchester
//=============================================================================
static struct {
Demod.syncBit = 0;
//Demod.samples = 0;
Demod.posCount = 1; // This is the first half bit period, so after syncing handle the second part
- /* if(bit & 0x08) { Demod.syncBit = 0x08; }
- if(!Demod.syncBit) {
- if(bit & 0x04) { Demod.syncBit = 0x04; }
- }
- else if(bit & 0x04) { Demod.syncBit = 0x04; bit <<= 4; }
- if(!Demod.syncBit) {
- if(bit & 0x02) { Demod.syncBit = 0x02; }
- }
- else if(bit & 0x02) { Demod.syncBit = 0x02; bit <<= 4; }
- if(!Demod.syncBit) {
- if(bit & 0x01) { Demod.syncBit = 0x01; }
-
- if(Demod.syncBit && (Demod.buffer & 0x08)) {
- Demod.syncBit = 0x08;
-
- // The first half bitperiod is expected in next sample
- Demod.posCount = 0;
- Demod.output[Demod.len] = 0xfb;
- }
- }
- else if(bit & 0x01) { Demod.syncBit = 0x01; }
- */
if(bit & 0x08) {
Demod.syncBit = 0x08;
}
//=============================================================================
-// Finally, a `sniffer' for ISO 14443 Type A
+// Finally, a `sniffer' for iClass communication
// Both sides of communication!
//=============================================================================
//-----------------------------------------------------------------------------
void RAMFUNC SnoopIClass(void)
{
-// #define RECV_CMD_OFFSET 2032 // original (working as of 21/2/09) values
-// #define RECV_RES_OFFSET 2096 // original (working as of 21/2/09) values
-// #define DMA_BUFFER_OFFSET 2160 // original (working as of 21/2/09) values
-// #define DMA_BUFFER_SIZE 4096 // original (working as of 21/2/09) values
-// #define TRACE_LENGTH 2000 // original (working as of 21/2/09) values
+
// We won't start recording the frames that we acquire until we trigger;
// a good trigger condition to get started is probably when we see a
// response from the tag.
- int triggered = FALSE; // FALSE to wait first for card
+ //int triggered = FALSE; // FALSE to wait first for card
// The command (reader -> tag) that we're receiving.
// The length of a received command will in most cases be no more than 18 bytes.
// So 32 should be enough!
- uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+ uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
// The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
+ uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
- // As we receive stuff, we copy it from receivedCmd or receivedResponse
- // into trace, along with its length and other annotations.
- //uint8_t *trace = (uint8_t *)BigBuf;
-
- traceLen = 0; // uncommented to fix ISSUE 15 - gerhard - jan2011
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+ // reset traceLen to 0
+ iso14a_set_tracing(TRUE);
+ iso14a_clear_trace();
+ iso14a_set_trigger(FALSE);
// The DMA buffer, used to stream samples from the FPGA
int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
int samples = 0;
rsamples = 0;
- memset(trace, 0x44, RECV_CMD_OFFSET);
-
// Set up the demodulator for tag -> reader responses.
- Demod.output = receivedResponse;
+ Demod.output = tagToReaderResponse;
Demod.len = 0;
Demod.state = DEMOD_UNSYNCD;
// And the reader -> tag commands
memset(&Uart, 0, sizeof(Uart));
- Uart.output = receivedCmd;
+ Uart.output = readerToTagCmd;
Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
Uart.state = STATE_UNSYNCD;
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ uint32_t time_0 = GetCountSspClk();
+
+
int div = 0;
//int div2 = 0;
int decbyte = 0;
//samples += 4;
samples += 1;
- //div2++;
- //if(div2 > 3) {
- //div2 = 0;
- //decbyte ^= ((smpl & 0x01) << (3 - div));
- //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1)) << (3 - div)); // better already...
- //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1) | ((smpl & 0x04) >> 2)) << (3 - div)); // even better...
if(smpl & 0xF) {
decbyte ^= (1 << (3 - div));
}
- //decbyte ^= (MajorityNibble[(smpl & 0x0F)] << (3 - div));
// FOR READER SIDE COMMUMICATION...
- //decbyte ^= ((smpl & 0x10) << (3 - div));
+
decbyter <<= 2;
decbyter ^= (smpl & 0x30);
if((div + 1) % 2 == 0) {
smpl = decbyter;
- if(MillerDecoding((smpl & 0xF0) >> 4)) {
+ if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
rsamples = samples - Uart.samples;
LED_C_ON();
- //if(triggered) {
- trace[traceLen++] = ((rsamples >> 0) & 0xff);
- trace[traceLen++] = ((rsamples >> 8) & 0xff);
- trace[traceLen++] = ((rsamples >> 16) & 0xff);
- trace[traceLen++] = ((rsamples >> 24) & 0xff);
- trace[traceLen++] = ((Uart.parityBits >> 0) & 0xff);
- trace[traceLen++] = ((Uart.parityBits >> 8) & 0xff);
- trace[traceLen++] = ((Uart.parityBits >> 16) & 0xff);
- trace[traceLen++] = ((Uart.parityBits >> 24) & 0xff);
- trace[traceLen++] = Uart.byteCnt;
- memcpy(trace+traceLen, receivedCmd, Uart.byteCnt);
- traceLen += Uart.byteCnt;
- if(traceLen > TRACE_LENGTH) break;
- //}
- /* And ready to receive another command. */
+
+ //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
+ //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
+ if(tracing)
+ {
+ LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, Uart.parityBits,TRUE);
+ LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, TRUE);
+ }
+
+
+ /* And ready to receive another command. */
Uart.state = STATE_UNSYNCD;
/* And also reset the demod code, which might have been */
/* false-triggered by the commands from the reader. */
rsamples = samples - Demod.samples;
LED_B_ON();
- // timestamp, as a count of samples
- trace[traceLen++] = ((rsamples >> 0) & 0xff);
- trace[traceLen++] = ((rsamples >> 8) & 0xff);
- trace[traceLen++] = ((rsamples >> 16) & 0xff);
- trace[traceLen++] = 0x80 | ((rsamples >> 24) & 0xff);
- trace[traceLen++] = ((Demod.parityBits >> 0) & 0xff);
- trace[traceLen++] = ((Demod.parityBits >> 8) & 0xff);
- trace[traceLen++] = ((Demod.parityBits >> 16) & 0xff);
- trace[traceLen++] = ((Demod.parityBits >> 24) & 0xff);
- // length
- trace[traceLen++] = Demod.len;
- memcpy(trace+traceLen, receivedResponse, Demod.len);
- traceLen += Demod.len;
- if(traceLen > TRACE_LENGTH) break;
-
- triggered = TRUE;
+ if(tracing)
+ {
+ LogTrace(Demod.output,Demod.len, (GetCountSspClk()-time_0) << 4 , Demod.parityBits,FALSE);
+ LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, FALSE);
+ }
+
// And ready to receive another response.
memset(&Demod, 0, sizeof(Demod));
- Demod.output = receivedResponse;
+ Demod.output = tagToReaderResponse;
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
}
Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
LED_A_OFF();
LED_B_OFF();
- LED_C_OFF();
+ LED_C_OFF();
+ LED_D_OFF();
+}
+
+void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
+ int i;
+ for(i = 0; i < 8; i++) {
+ rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
+ }
+}
+
+//-----------------------------------------------------------------------------
+// Wait for commands from reader
+// Stop when button is pressed
+// Or return TRUE when command is captured
+//-----------------------------------------------------------------------------
+static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
+{
+ // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
+ // only, since we are receiving, not transmitting).
+ // Signal field is off with the appropriate LED
+ LED_D_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
+ // Now run a `software UART' on the stream of incoming samples.
+ Uart.output = received;
+ Uart.byteCntMax = maxLen;
+ Uart.state = STATE_UNSYNCD;
+
+ for(;;) {
+ WDT_HIT();
+
+ if(BUTTON_PRESS()) return FALSE;
+
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ /*if(OutOfNDecoding((b & 0xf0) >> 4)) {
+ *len = Uart.byteCnt;
+ return TRUE;
+ }*/
+ if(OutOfNDecoding(b & 0x0f)) {
+ *len = Uart.byteCnt;
+ return TRUE;
+ }
+ }
+ }
+}
+
+
+//-----------------------------------------------------------------------------
+// Prepare tag messages
+//-----------------------------------------------------------------------------
+static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
+{
+ //So far a dummy implementation, not used
+ //int lastProxToAirDuration =0;
+ int i;
+
+ ToSendReset();
+
+ // Send SOF
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;
+
+ for(i = 0; i < len; i++) {
+ int j;
+ uint8_t b = cmd[i];
+
+ // Data bits
+ for(j = 0; j < 8; j++) {
+ if(b & 1) {
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;
+ } else {
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0x00;
+ }
+ b >>= 1;
+ }
+ }
+
+ // Send EOF
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+
+ //lastProxToAirDuration = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
+
+ // Convert from last byte pos to length
+ ToSendMax++;
+}
+
+// Only SOF
+static void CodeIClassTagSOF()
+{
+ //So far a dummy implementation, not used
+ //int lastProxToAirDuration =0;
+
+ ToSendReset();
+ // Send SOF
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0xff;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xff;
+
+// lastProxToAirDuration = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
+
+
+ // Convert from last byte pos to length
+ ToSendMax++;
+}
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
+/**
+ * @brief SimulateIClass simulates an iClass card.
+ * @param arg0 type of simulation
+ * - 0 uses the first 8 bytes in usb data as CSN
+ * - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
+ * in the usb data. This mode collects MAC from the reader, in order to do an offline
+ * attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
+ * - Other : Uses the default CSN (031fec8af7ff12e0)
+ * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
+ * @param arg2
+ * @param datain
+ */
+void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
+{
+ uint32_t simType = arg0;
+ uint32_t numberOfCSNS = arg1;
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+ // Enable and clear the trace
+ iso14a_set_tracing(TRUE);
+ iso14a_clear_trace();
+
+ uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+ if(simType == 0) {
+ // Use the CSN from commandline
+ memcpy(csn_crc, datain, 8);
+ doIClassSimulation(csn_crc,0,NULL);
+ }else if(simType == 1)
+ {
+ doIClassSimulation(csn_crc,0,NULL);
+ }
+ else if(simType == 2)
+ {
+
+ uint8_t mac_responses[64] = { 0 };
+ Dbprintf("Going into attack mode");
+ // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
+ // in order to collect MAC's from the reader. This can later be used in an offlne-attack
+ // in order to obtain the keys, as in the "dismantling iclass"-paper.
+ int i = 0;
+ for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
+ {
+ // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
+
+ memcpy(csn_crc, datain+(i*8), 8);
+ if(doIClassSimulation(csn_crc,1,mac_responses))
+ {
+ return; // Button pressed
+ }
+ }
+ cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+
+ }
+ else{
+ // We may want a mode here where we hardcode the csns to use (from proxclone).
+ // That will speed things up a little, but not required just yet.
+ Dbprintf("The mode is not implemented, reserved for future use");
+ }
+ Dbprintf("Done...");
+
+}
+/**
+ * @brief Does the actual simulation
+ * @param csn - csn to use
+ * @param breakAfterMacReceived if true, returns after reader MAC has been received.
+ */
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
+{
+
+
+ // CSN followed by two CRC bytes
+ uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
+ memcpy(response3,csn,sizeof(response3));
+ Dbprintf("Simulating CSN %02x%02x%02x%02x%02x%02x%02x%02x",csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
+ // e-Purse
+ uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+ // Construct anticollision-CSN
+ rotateCSN(response3,response2);
+
+ // Compute CRC on both CSNs
+ ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
+ ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
+
+ int exitLoop = 0;
+ // Reader 0a
+ // Tag 0f
+ // Reader 0c
+ // Tag anticoll. CSN
+ // Reader 81 anticoll. CSN
+ // Tag CSN
+
+ uint8_t *resp;
+ int respLen;
+ uint8_t* respdata = NULL;
+ int respsize = 0;
+ uint8_t sof = 0x0f;
+
+ // Respond SOF -- takes 8 bytes
+ uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+ int resp1Len;
+
+ // Anticollision CSN (rotated CSN)
+ // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
+ uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10);
+ int resp2Len;
+
+ // CSN
+ // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
+ uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190);
+ int resp3Len;
+
+ // e-Purse
+ // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
+ uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370);
+ int resp4Len;
+
+ // + 1720..
+ uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+ memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+ int len;
+
+ // Prepare card messages
+ ToSendMax = 0;
+
+ // First card answer: SOF
+ CodeIClassTagSOF();
+ memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+
+ // Anticollision CSN
+ CodeIClassTagAnswer(response2, sizeof(response2));
+ memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
+
+ // CSN
+ CodeIClassTagAnswer(response3, sizeof(response3));
+ memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
+
+ // e-Purse
+ CodeIClassTagAnswer(response4, sizeof(response4));
+ memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
+
+
+ // Start from off (no field generated)
+ //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ //SpinDelay(200);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+ SpinDelay(100);
+ StartCountSspClk();
+ // We need to listen to the high-frequency, peak-detected path.
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ FpgaSetupSsc();
+
+ // To control where we are in the protocol
+ int cmdsRecvd = 0;
+ uint32_t time_0 = GetCountSspClk();
+ uint32_t t2r_time =0;
+ uint32_t r2t_time =0;
+
+ LED_A_ON();
+ bool buttonPressed = false;
+
+ /** Hack for testing
+ memcpy(reader_mac_buf,csn,8);
+ exitLoop = true;
+ end hack **/
+
+ while(!exitLoop) {
+
+ LED_B_OFF();
+ //Signal tracer
+ // Can be used to get a trigger for an oscilloscope..
+ LED_C_OFF();
+
+ if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
+ buttonPressed = true;
+ break;
+ }
+ r2t_time = GetCountSspClk();
+ //Signal tracer
+ LED_C_ON();
+
+ // Okay, look at the command now.
+ if(receivedCmd[0] == 0x0a ) {
+ // Reader in anticollission phase
+ resp = resp1; respLen = resp1Len; //order = 1;
+ respdata = &sof;
+ respsize = sizeof(sof);
+ } else if(receivedCmd[0] == 0x0c) {
+ // Reader asks for anticollission CSN
+ resp = resp2; respLen = resp2Len; //order = 2;
+ respdata = response2;
+ respsize = sizeof(response2);
+ //DbpString("Reader requests anticollission CSN:");
+ } else if(receivedCmd[0] == 0x81) {
+ // Reader selects anticollission CSN.
+ // Tag sends the corresponding real CSN
+ resp = resp3; respLen = resp3Len; //order = 3;
+ respdata = response3;
+ respsize = sizeof(response3);
+ //DbpString("Reader selects anticollission CSN:");
+ } else if(receivedCmd[0] == 0x88) {
+ // Read e-purse (88 02)
+ resp = resp4; respLen = resp4Len; //order = 4;
+ respdata = response4;
+ respsize = sizeof(response4);
+ LED_B_ON();
+ } else if(receivedCmd[0] == 0x05) {
+ // Reader random and reader MAC!!!
+ // Do not respond
+ // We do not know what to answer, so lets keep quit
+ resp = resp1; respLen = 0; //order = 5;
+ respdata = NULL;
+ respsize = 0;
+ if (breakAfterMacReceived){
+ // TODO, actually return this to the caller instead of just
+ // dbprintf:ing ...
+ Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x",csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
+ Dbprintf("RDR: (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
+ receivedCmd[0], receivedCmd[1], receivedCmd[2],
+ receivedCmd[3], receivedCmd[4], receivedCmd[5],
+ receivedCmd[6], receivedCmd[7], receivedCmd[8]);
+ if (reader_mac_buf != NULL)
+ {
+ memcpy(reader_mac_buf,receivedCmd+1,8);
+ }
+ exitLoop = true;
+ }
+ } else if(receivedCmd[0] == 0x00 && len == 1) {
+ // Reader ends the session
+ resp = resp1; respLen = 0; //order = 0;
+ respdata = NULL;
+ respsize = 0;
+ } else {
+ //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
+ // Never seen this command before
+ Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
+ len,
+ receivedCmd[0], receivedCmd[1], receivedCmd[2],
+ receivedCmd[3], receivedCmd[4], receivedCmd[5],
+ receivedCmd[6], receivedCmd[7], receivedCmd[8]);
+ // Do not respond
+ resp = resp1; respLen = 0; //order = 0;
+ respdata = NULL;
+ respsize = 0;
+ }
+
+ if(cmdsRecvd > 100) {
+ //DbpString("100 commands later...");
+ //break;
+ }
+ else {
+ cmdsRecvd++;
+ }
+
+ if(respLen > 0) {
+ SendIClassAnswer(resp, respLen, 21);
+ t2r_time = GetCountSspClk();
+ }
+
+ if (tracing) {
+ LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, Uart.parityBits,TRUE);
+ LogTrace(NULL,0, (r2t_time-time_0) << 4, 0,TRUE);
+
+ if (respdata != NULL) {
+ LogTrace(respdata,respsize, (t2r_time-time_0) << 4,SwapBits(GetParity(respdata,respsize),respsize),FALSE);
+ LogTrace(NULL,0, (t2r_time-time_0) << 4,0,FALSE);
+
+
+ }
+ if(!tracing) {
+ DbpString("Trace full");
+ //break;
+ }
+
+ }
+ memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+ }
+
+ //Dbprintf("%x", cmdsRecvd);
+ LED_A_OFF();
+ LED_B_OFF();
+ if(buttonPressed)
+ {
+ DbpString("Button pressed");
+ }
+ return buttonPressed;
+}
+
+static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
+{
+ int i = 0, d=0;//, u = 0, d = 0;
+ uint8_t b = 0;
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ FpgaSetupSsc();
+ while(!BUTTON_PRESS()) {
+ if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
+ b = AT91C_BASE_SSC->SSC_RHR; (void) b;
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
+ b = 0x00;
+ if(d < delay) {
+ d++;
+ }
+ else {
+ if( i < respLen){
+ b = resp[i];
+ //Hack
+ //b = 0xAC;
+ }
+ i++;
+ }
+ AT91C_BASE_SSC->SSC_THR = b;
+ }
+
+ if (i > respLen +4) break;
+ }
+
+ return 0;
+}
+
+/// THE READER CODE
+
+//-----------------------------------------------------------------------------
+// Transmit the command (to the tag) that was placed in ToSend[].
+//-----------------------------------------------------------------------------
+static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
+{
+ int c;
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ FpgaSetupSsc();
+
+ if (wait)
+ if(*wait < 10)
+ *wait = 10;
+
+ for(c = 0; c < *wait;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing!
+ c++;
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+ (void)r;
+ }
+ WDT_HIT();
+ }
+
+ uint8_t sendbyte;
+ bool firstpart = TRUE;
+ c = 0;
+ for(;;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+
+ // DOUBLE THE SAMPLES!
+ if(firstpart) {
+ sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4);
+ }
+ else {
+ sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
+ c++;
+ }
+ if(sendbyte == 0xff) {
+ sendbyte = 0xfe;
+ }
+ AT91C_BASE_SSC->SSC_THR = sendbyte;
+ firstpart = !firstpart;
+
+ if(c >= len) {
+ break;
+ }
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+ (void)r;
+ }
+ WDT_HIT();
+ }
+ if (samples) *samples = (c + *wait) << 3;
+}
+
+
+//-----------------------------------------------------------------------------
+// Prepare iClass reader command to send to FPGA
+//-----------------------------------------------------------------------------
+void CodeIClassCommand(const uint8_t * cmd, int len)
+{
+ int i, j, k;
+ uint8_t b;
+
+ ToSendReset();
+
+ // Start of Communication: 1 out of 4
+ ToSend[++ToSendMax] = 0xf0;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x0f;
+ ToSend[++ToSendMax] = 0x00;
+
+ // Modulate the bytes
+ for (i = 0; i < len; i++) {
+ b = cmd[i];
+ for(j = 0; j < 4; j++) {
+ for(k = 0; k < 4; k++) {
+ if(k == (b & 3)) {
+ ToSend[++ToSendMax] = 0x0f;
+ }
+ else {
+ ToSend[++ToSendMax] = 0x00;
+ }
+ }
+ b >>= 2;
+ }
+ }
+
+ // End of Communication
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0x00;
+ ToSend[++ToSendMax] = 0xf0;
+ ToSend[++ToSendMax] = 0x00;
+
+ // Convert from last character reference to length
+ ToSendMax++;
+}
+
+void ReaderTransmitIClass(uint8_t* frame, int len)
+{
+ int wait = 0;
+ int samples = 0;
+ int par = 0;
+
+ // This is tied to other size changes
+ // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
+ CodeIClassCommand(frame,len);
+
+ // Select the card
+ TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
+ if(trigger)
+ LED_A_ON();
+
+ // Store reader command in buffer
+ if (tracing) LogTrace(frame,len,rsamples,par,TRUE);
+}
+
+//-----------------------------------------------------------------------------
+// Wait a certain time for tag response
+// If a response is captured return TRUE
+// If it takes too long return FALSE
+//-----------------------------------------------------------------------------
+static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
+{
+ // buffer needs to be 512 bytes
+ int c;
+
+ // Set FPGA mode to "reader listen mode", no modulation (listen
+ // only, since we are receiving, not transmitting).
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
+
+ // Now get the answer from the card
+ Demod.output = receivedResponse;
+ Demod.len = 0;
+ Demod.state = DEMOD_UNSYNCD;
+
+ uint8_t b;
+ if (elapsed) *elapsed = 0;
+
+ bool skip = FALSE;
+
+ c = 0;
+ for(;;) {
+ WDT_HIT();
+
+ if(BUTTON_PRESS()) return FALSE;
+
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x00; // To make use of exact timing of next command from reader!!
+ if (elapsed) (*elapsed)++;
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ if(c < timeout) { c++; } else { return FALSE; }
+ b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ skip = !skip;
+ if(skip) continue;
+ /*if(ManchesterDecoding((b>>4) & 0xf)) {
+ *samples = ((c - 1) << 3) + 4;
+ return TRUE;
+ }*/
+ if(ManchesterDecoding(b & 0x0f)) {
+ *samples = c << 3;
+ return TRUE;
+ }
+ }
+ }
+}
+
+int ReaderReceiveIClass(uint8_t* receivedAnswer)
+{
+ int samples = 0;
+ if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
+ rsamples += samples;
+ if (tracing) LogTrace(receivedAnswer,Demod.len,rsamples,Demod.parityBits,FALSE);
+ if(samples == 0) return FALSE;
+ return Demod.len;
+}
+
+// Reader iClass Anticollission
+void ReaderIClass(uint8_t arg0) {
+ uint8_t act_all[] = { 0x0a };
+ uint8_t identify[] = { 0x0c };
+ uint8_t select[] = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+ uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
+
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+ // Reset trace buffer
+ memset(trace, 0x44, RECV_CMD_OFFSET);
+ traceLen = 0;
+
+ // Setup SSC
+ FpgaSetupSsc();
+ // Start from off (no field generated)
+ // Signal field is off with the appropriate LED
LED_D_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ SpinDelay(200);
+
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ // Now give it time to spin up.
+ // Signal field is on with the appropriate LED
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+ SpinDelay(200);
+
+ LED_A_ON();
+
+ for(;;) {
+
+ if(traceLen > TRACE_SIZE) {
+ DbpString("Trace full");
+ break;
+ }
+
+ if (BUTTON_PRESS()) break;
+
+ // Send act_all
+ ReaderTransmitIClass(act_all, 1);
+ // Card present?
+ if(ReaderReceiveIClass(resp)) {
+ ReaderTransmitIClass(identify, 1);
+ if(ReaderReceiveIClass(resp) == 10) {
+ // Select card
+ memcpy(&select[1],resp,8);
+ ReaderTransmitIClass(select, sizeof(select));
+
+ if(ReaderReceiveIClass(resp) == 10) {
+ Dbprintf(" Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
+ resp[0], resp[1], resp[2],
+ resp[3], resp[4], resp[5],
+ resp[6], resp[7]);
+ }
+ // Card selected, whats next... ;-)
+ }
+ }
+ WDT_HIT();
+ }
+
+ LED_A_OFF();
}
+
projects / proxmark3-svn / blobdiff