// 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"
+#include "cmd.h"
+#include "iso14443a.h"
+// Needed for CRC in emulation mode;
+// same construction as in ISO 14443;
+// different initial value (CRC_ICLASS)
+#include "iso14443crc.h"
+#include "iso15693tools.h"
+#include "protocols.h"
+#include "optimized_cipher.h"
+#include "usb_cdc.h" // for usb_poll_validate_length
+
+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 samples;
int highCnt;
int swapper;
int counter;
int bitBuffer;
int dropPosition;
- uint8_t *output;
+ 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) {
if(Uart.byteCnt == 0) {
// Its not straightforward to show single EOFs
// So just leave it and do not return TRUE
- Uart.output[Uart.byteCnt] = 0xf0;
+ Uart.output[0] = 0xf0;
Uart.byteCnt++;
-
- // Calculate the parity bit for the client...
- Uart.parityBits = 1;
}
else {
return TRUE;
// 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.bitCnt == 8) {
Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
Uart.byteCnt++;
-
- // Calculate the parity bit for the client...
- Uart.parityBits <<= 1;
- Uart.parityBits ^= OddByteParity[(Uart.shiftReg & 0xff)];
-
Uart.bitCnt = 0;
Uart.shiftReg = 0;
}
if(!Uart.dropPosition) {
Uart.state = STATE_UNSYNCD;
Uart.highCnt = 0;
- error = 3;
+ //error = 3;
}
else {
Uart.dropPosition--;
Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
Uart.byteCnt++;
-
- // Calculate the parity bit for the client...
- Uart.parityBits <<= 1;
- Uart.parityBits ^= OddByteParity[(Uart.dropPosition & 0xff)];
-
Uart.bitCnt = 0;
Uart.shiftReg = 0;
Uart.nOutOfCnt = 0;
Uart.state = STATE_START_OF_COMMUNICATION;
Uart.bitCnt = 0;
Uart.byteCnt = 0;
- Uart.parityBits = 0;
Uart.nOutOfCnt = 0;
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 {
int bitCount;
int posCount;
int syncBit;
- int parityBits;
uint16_t shiftReg;
int buffer;
int buffer2;
SUB_SECOND_HALF,
SUB_BOTH
} sub;
- uint8_t *output;
+ uint8_t *output;
} Demod;
static RAMFUNC int ManchesterDecoding(int v)
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;
Demod.sub = SUB_FIRST_HALF;
Demod.bitCount = 0;
Demod.shiftReg = 0;
- Demod.parityBits = 0;
Demod.samples = 0;
if(Demod.posCount) {
//if(trigger) LED_A_OFF(); // Not useful in this case...
else {
modulation = bit & Demod.syncBit;
modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
- //modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
Demod.samples += 4;
if(Demod.state == DEMOD_SOF_COMPLETE) {
Demod.output[Demod.len] = 0x0f;
Demod.len++;
- Demod.parityBits <<= 1;
- Demod.parityBits ^= OddByteParity[0x0f];
Demod.state = DEMOD_UNSYNCD;
// error = 0x0f;
return TRUE;
// Tag response does not need to be a complete byte!
if(Demod.len > 0 || Demod.bitCount > 0) {
if(Demod.bitCount > 1) { // was > 0, do not interpret last closing bit, is part of EOF
- Demod.shiftReg >>= (9 - Demod.bitCount);
+ Demod.shiftReg >>= (9 - Demod.bitCount); // right align data
Demod.output[Demod.len] = Demod.shiftReg & 0xff;
Demod.len++;
- // No parity bit, so just shift a 0
- Demod.parityBits <<= 1;
}
Demod.state = DEMOD_UNSYNCD;
Demod.shiftReg >>= 1;
Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
Demod.len++;
-
- // FOR ISO15639 PARITY NOT SEND OTA, JUST CALCULATE IT FOR THE CLIENT
- Demod.parityBits <<= 1;
- Demod.parityBits ^= OddByteParity[(Demod.shiftReg & 0xff)];
-
Demod.bitCount = 0;
Demod.shiftReg = 0;
}
}
//=============================================================================
-// 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);
+ #define ICLASS_BUFFER_SIZE 32
+ uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
// The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = (((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
-
+ uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
+
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+ // free all BigBuf memory
+ BigBuf_free();
// The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
- int lastRxCounter;
- int8_t *upTo;
+ uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+
+ set_tracing(TRUE);
+ clear_trace();
+ iso14a_set_trigger(FALSE);
+
+ int lastRxCounter;
+ uint8_t *upTo;
int smpl;
int maxBehindBy = 0;
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();
+ uint32_t time_start = 0;
+ uint32_t time_stop = 0;
+
int div = 0;
//int div2 = 0;
int decbyte = 0;
(DMA_BUFFER_SIZE-1);
if(behindBy > maxBehindBy) {
maxBehindBy = behindBy;
- if(behindBy > 400) {
+ if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
goto done;
}
//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;
+ time_stop = (GetCountSspClk()-time_0) << 4;
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) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ GetParity(Uart.output, Uart.byteCnt, parity);
+ LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, 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. */
Demod.state = DEMOD_UNSYNCD;
LED_B_OFF();
Uart.byteCnt = 0;
+ }else{
+ time_start = (GetCountSspClk()-time_0) << 4;
}
decbyter = 0;
}
if(div > 3) {
smpl = decbyte;
if(ManchesterDecoding(smpl & 0x0F)) {
- rsamples = samples - Demod.samples;
+ time_stop = (GetCountSspClk()-time_0) << 4;
+
+ 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) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ GetParity(Demod.output, Demod.len, parity);
+ LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, 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();
+ }else{
+ time_start = (GetCountSspClk()-time_0) << 4;
}
div = 0;
DbpString("COMMAND FINISHED");
Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
- Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+ Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
done:
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
- Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+ Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
LED_A_OFF();
LED_B_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 & 0x0f)) {
+ *len = Uart.byteCnt;
+ return TRUE;
+ }
+ }
+ }
+}
+
+static uint8_t encode4Bits(const uint8_t b)
+{
+ uint8_t c = b & 0xF;
+ // OTA, the least significant bits first
+ // The columns are
+ // 1 - Bit value to send
+ // 2 - Reversed (big-endian)
+ // 3 - Encoded
+ // 4 - Hex values
+
+ switch(c){
+ // 1 2 3 4
+ case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
+ case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
+ case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
+ case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
+ case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
+ case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
+ case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
+ case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
+ case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
+ case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
+ case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
+ case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
+ case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
+ case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
+ case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
+ default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
+
+ }
+}
+
+//-----------------------------------------------------------------------------
+// Prepare tag messages
+//-----------------------------------------------------------------------------
+static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
+{
+
+ /*
+ * SOF comprises 3 parts;
+ * * An unmodulated time of 56.64 us
+ * * 24 pulses of 423.75 KHz (fc/32)
+ * * A logic 1, which starts with an unmodulated time of 18.88us
+ * followed by 8 pulses of 423.75kHz (fc/32)
+ *
+ *
+ * EOF comprises 3 parts:
+ * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
+ * time of 18.88us.
+ * - 24 pulses of fc/32
+ * - An unmodulated time of 56.64 us
+ *
+ *
+ * A logic 0 starts with 8 pulses of fc/32
+ * followed by an unmodulated time of 256/fc (~18,88us).
+ *
+ * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
+ * 8 pulses of fc/32 (also 18.88us)
+ *
+ * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
+ * works like this.
+ * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
+ * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
+ *
+ * In this mode the SOF can be written as 00011101 = 0x1D
+ * The EOF can be written as 10111000 = 0xb8
+ * A logic 1 is 01
+ * A logic 0 is 10
+ *
+ * */
+
+ int i;
+
+ ToSendReset();
+
+ // Send SOF
+ ToSend[++ToSendMax] = 0x1D;
+
+ for(i = 0; i < len; i++) {
+ uint8_t b = cmd[i];
+ ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
+ ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
+ }
+
+ // Send EOF
+ ToSend[++ToSendMax] = 0xB8;
+ //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] = 0x1D;
+// lastProxToAirDuration = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
+
+ // Convert from last byte pos to length
+ ToSendMax++;
+}
+#define MODE_SIM_CSN 0
+#define MODE_EXIT_AFTER_MAC 1
+#define MODE_FULLSIM 2
+
+int doIClassSimulation(int simulationMode, 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
+ set_tracing(TRUE);
+ clear_trace();
+ //Use the emulator memory for SIM
+ uint8_t *emulator = BigBuf_get_EM_addr();
+
+ if(simType == 0) {
+ // Use the CSN from commandline
+ memcpy(emulator, datain, 8);
+ doIClassSimulation(MODE_SIM_CSN,NULL);
+ }else if(simType == 1)
+ {
+ //Default CSN
+ uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+ // Use the CSN from commandline
+ memcpy(emulator, csn_crc, 8);
+ doIClassSimulation(MODE_SIM_CSN,NULL);
+ }
+ else if(simType == 2)
+ {
+
+ uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
+ Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
+ // 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(emulator, datain+(i*8), 8);
+ if(doIClassSimulation(MODE_EXIT_AFTER_MAC,mac_responses+i*8))
+ {
+ cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+ return; // Button pressed
+ }
+ }
+ cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+
+ }else if(simType == 3){
+ //This is 'full sim' mode, where we use the emulator storage for data.
+ doIClassSimulation(MODE_FULLSIM, NULL);
+ }
+ 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...");
+
+}
+void AppendCrc(uint8_t* data, int len)
+{
+ ComputeCrc14443(CRC_ICLASS,data,len,data+len,data+len+1);
+}
+
+/**
+ * @brief Does the actual simulation
+ * @param csn - csn to use
+ * @param breakAfterMacReceived if true, returns after reader MAC has been received.
+ */
+int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
+{
+ // free eventually allocated BigBuf memory
+ BigBuf_free_keep_EM();
+
+ State cipher_state;
+// State cipher_state_reserve;
+ uint8_t *csn = BigBuf_get_EM_addr();
+ uint8_t *emulator = csn;
+ uint8_t sof_data[] = { 0x0F} ;
+ // CSN followed by two CRC bytes
+ uint8_t anticoll_data[10] = { 0 };
+ uint8_t csn_data[10] = { 0 };
+ memcpy(csn_data,csn,sizeof(csn_data));
+ 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]);
+
+ // Construct anticollision-CSN
+ rotateCSN(csn_data,anticoll_data);
+
+ // Compute CRC on both CSNs
+ ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]);
+ ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]);
+
+ uint8_t diversified_key[8] = { 0 };
+ // e-Purse
+ uint8_t card_challenge_data[8] = { 0x00 };
+ if(simulationMode == MODE_FULLSIM)
+ {
+ //The diversified key should be stored on block 3
+ //Get the diversified key from emulator memory
+ memcpy(diversified_key, emulator+(8*3),8);
+
+ //Card challenge, a.k.a e-purse is on block 2
+ memcpy(card_challenge_data,emulator + (8 * 2) , 8);
+ //Precalculate the cipher state, feeding it the CC
+ cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key);
+
+ }
+
+ int exitLoop = 0;
+ // Reader 0a
+ // Tag 0f
+ // Reader 0c
+ // Tag anticoll. CSN
+ // Reader 81 anticoll. CSN
+ // Tag CSN
+
+ uint8_t *modulated_response;
+ int modulated_response_size = 0;
+ uint8_t* trace_data = NULL;
+ int trace_data_size = 0;
+
+
+ // Respond SOF -- takes 1 bytes
+ uint8_t *resp_sof = BigBuf_malloc(2);
+ int resp_sof_Len;
+
+ // Anticollision CSN (rotated CSN)
+ // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+ uint8_t *resp_anticoll = BigBuf_malloc(28);
+ int resp_anticoll_len;
+
+ // CSN
+ // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+ uint8_t *resp_csn = BigBuf_malloc(30);
+ int resp_csn_len;
+
+ // e-Purse
+ // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
+ uint8_t *resp_cc = BigBuf_malloc(20);
+ int resp_cc_len;
+
+ uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+ int len;
+
+ // Prepare card messages
+ ToSendMax = 0;
+
+ // First card answer: SOF
+ CodeIClassTagSOF();
+ memcpy(resp_sof, ToSend, ToSendMax); resp_sof_Len = ToSendMax;
+
+ // Anticollision CSN
+ CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));
+ memcpy(resp_anticoll, ToSend, ToSendMax); resp_anticoll_len = ToSendMax;
+
+ // CSN
+ CodeIClassTagAnswer(csn_data, sizeof(csn_data));
+ memcpy(resp_csn, ToSend, ToSendMax); resp_csn_len = ToSendMax;
+
+ // e-Purse
+ CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));
+ memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax;
+
+ //This is used for responding to READ-block commands or other data which is dynamically generated
+ //First the 'trace'-data, not encoded for FPGA
+ uint8_t *data_generic_trace = BigBuf_malloc(8 + 2);//8 bytes data + 2byte CRC is max tag answer
+ //Then storage for the modulated data
+ //Each bit is doubled when modulated for FPGA, and we also have SOF and EOF (2 bytes)
+ uint8_t *data_response = BigBuf_malloc( (8+2) * 2 + 2);
+
+ // 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;
+ uint8_t response_delay = 1;
+ while(!exitLoop) {
+ response_delay = 1;
+ 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] == ICLASS_CMD_ACTALL ) {
+ // Reader in anticollission phase
+ modulated_response = resp_sof; modulated_response_size = resp_sof_Len; //order = 1;
+ trace_data = sof_data;
+ trace_data_size = sizeof(sof_data);
+ } else if(receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) {
+ // Reader asks for anticollission CSN
+ modulated_response = resp_anticoll; modulated_response_size = resp_anticoll_len; //order = 2;
+ trace_data = anticoll_data;
+ trace_data_size = sizeof(anticoll_data);
+ //DbpString("Reader requests anticollission CSN:");
+ } else if(receivedCmd[0] == ICLASS_CMD_SELECT) {
+ // Reader selects anticollission CSN.
+ // Tag sends the corresponding real CSN
+ modulated_response = resp_csn; modulated_response_size = resp_csn_len; //order = 3;
+ trace_data = csn_data;
+ trace_data_size = sizeof(csn_data);
+ //DbpString("Reader selects anticollission CSN:");
+ } else if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {
+ // Read e-purse (88 02)
+ modulated_response = resp_cc; modulated_response_size = resp_cc_len; //order = 4;
+ trace_data = card_challenge_data;
+ trace_data_size = sizeof(card_challenge_data);
+ LED_B_ON();
+ } else if(receivedCmd[0] == ICLASS_CMD_CHECK) {
+ // Reader random and reader MAC!!!
+ if(simulationMode == MODE_FULLSIM)
+ {
+ //NR, from reader, is in receivedCmd +1
+ opt_doTagMAC_2(cipher_state,receivedCmd+1,data_generic_trace,diversified_key);
+
+ trace_data = data_generic_trace;
+ trace_data_size = 4;
+ CodeIClassTagAnswer(trace_data , trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ response_delay = 0;//We need to hurry here...
+ //exitLoop = true;
+ }else
+ { //Not fullsim, we don't respond
+ // We do not know what to answer, so lets keep quiet
+ modulated_response = resp_sof; modulated_response_size = 0;
+ trace_data = NULL;
+ trace_data_size = 0;
+ if (simulationMode == MODE_EXIT_AFTER_MAC){
+ // 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] == ICLASS_CMD_HALT && len == 1) {
+ // Reader ends the session
+ modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+ trace_data = NULL;
+ trace_data_size = 0;
+ } else if(simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4){
+ //Read block
+ uint16_t blk = receivedCmd[1];
+ //Take the data...
+ memcpy(data_generic_trace, emulator+(blk << 3),8);
+ //Add crc
+ AppendCrc(data_generic_trace, 8);
+ trace_data = data_generic_trace;
+ trace_data_size = 10;
+ CodeIClassTagAnswer(trace_data , trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }else if(receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM)
+ {//Probably the reader wants to update the nonce. Let's just ignore that for now.
+ // OBS! If this is implemented, don't forget to regenerate the cipher_state
+ //We're expected to respond with the data+crc, exactly what's already in the receivedcmd
+ //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b|
+
+ //Take the data...
+ memcpy(data_generic_trace, receivedCmd+2,8);
+ //Add crc
+ AppendCrc(data_generic_trace, 8);
+ trace_data = data_generic_trace;
+ trace_data_size = 10;
+ CodeIClassTagAnswer(trace_data , trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }
+ else if(receivedCmd[0] == ICLASS_CMD_PAGESEL)
+ {//Pagesel
+ //Pagesel enables to select a page in the selected chip memory and return its configuration block
+ //Chips with a single page will not answer to this command
+ // It appears we're fine ignoring this.
+ //Otherwise, we should answer 8bytes (block) + 2bytes CRC
+ }
+ 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
+ modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+ trace_data = NULL;
+ trace_data_size = 0;
+ }
+
+ if(cmdsRecvd > 100) {
+ //DbpString("100 commands later...");
+ //break;
+ }
+ else {
+ cmdsRecvd++;
+ }
+ /**
+ A legit tag has about 380us delay between reader EOT and tag SOF.
+ **/
+ if(modulated_response_size > 0) {
+ SendIClassAnswer(modulated_response, modulated_response_size, response_delay);
+ t2r_time = GetCountSspClk();
+ }
+
+ if (tracing) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ GetParity(receivedCmd, len, parity);
+ LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
+
+ if (trace_data != NULL) {
+ GetParity(trace_data, trace_data_size, parity);
+ LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
+ }
+ if(!tracing) {
+ DbpString("Trace full");
+ //break;
+ }
+
+ }
+ }
+
+ //Dbprintf("%x", cmdsRecvd);
+ LED_A_OFF();
+ LED_B_OFF();
LED_C_OFF();
- LED_D_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);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
+
+ 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;
+ if (i > respLen +1) 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 && wait) *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] = 0xf0;
+ }
+ 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;
+
+ // This is tied to other size changes
+ CodeIClassCommand(frame,len);
+
+ // Select the card
+ TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
+ if(trigger)
+ LED_A_ON();
+
+ // Store reader command in buffer
+ if (tracing) {
+ uint8_t par[MAX_PARITY_SIZE];
+ GetParity(frame, len, par);
+ LogTrace(frame, len, rsamples, 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 & 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) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ GetParity(receivedAnswer, Demod.len, parity);
+ LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
+ }
+ if(samples == 0) return FALSE;
+ return Demod.len;
+}
+
+void setupIclassReader()
+{
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ // Reset trace buffer
+ set_tracing(TRUE);
+ clear_trace();
+
+ // 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();
+
+}
+
+bool sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
+{
+ while(retries-- > 0)
+ {
+ ReaderTransmitIClass(command, cmdsize);
+ if(expected_size == ReaderReceiveIClass(resp)){
+ return true;
+ }
+ }
+ return false;//Error
+}
+
+/**
+ * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
+ * @param card_data where the CSN and CC are stored for return
+ * @return 0 = fail
+ * 1 = Got CSN
+ * 2 = Got CSN and CC
+ */
+uint8_t handshakeIclassTag_ext(uint8_t *card_data, bool use_credit_key)
+{
+ static uint8_t act_all[] = { 0x0a };
+ //static uint8_t identify[] = { 0x0c };
+ static uint8_t identify[] = { 0x0c, 0x00, 0x73, 0x33 };
+ static uint8_t select[] = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ static uint8_t readcheck_cc[]= { 0x88, 0x02 };
+ if (use_credit_key)
+ readcheck_cc[0] = 0x18;
+ else
+ readcheck_cc[0] = 0x88;
+
+ uint8_t resp[ICLASS_BUFFER_SIZE];
+
+ uint8_t read_status = 0;
+
+ // Send act_all
+ ReaderTransmitIClass(act_all, 1);
+ // Card present?
+ if(!ReaderReceiveIClass(resp)) return read_status;//Fail
+ //Send Identify
+ ReaderTransmitIClass(identify, 1);
+ //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
+ uint8_t len = ReaderReceiveIClass(resp);
+ if(len != 10) return read_status;//Fail
+
+ //Copy the Anti-collision CSN to our select-packet
+ memcpy(&select[1],resp,8);
+ //Select the card
+ ReaderTransmitIClass(select, sizeof(select));
+ //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
+ len = ReaderReceiveIClass(resp);
+ if(len != 10) return read_status;//Fail
+
+ //Success - level 1, we got CSN
+ //Save CSN in response data
+ memcpy(card_data,resp,8);
+
+ //Flag that we got to at least stage 1, read CSN
+ read_status = 1;
+
+ // Card selected, now read e-purse (cc) (only 8 bytes no CRC)
+ ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
+ if(ReaderReceiveIClass(resp) == 8) {
+ //Save CC (e-purse) in response data
+ memcpy(card_data+8,resp,8);
+ read_status++;
+ }
+
+ return read_status;
+}
+uint8_t handshakeIclassTag(uint8_t *card_data) {
+ return handshakeIclassTag_ext(card_data, false);
+}
+
+
+// Reader iClass Anticollission
+void ReaderIClass(uint8_t arg0) {
+
+ uint8_t card_data[6 * 8]={0};
+ memset(card_data, 0xFF, sizeof(card_data));
+ uint8_t last_csn[8]={0,0,0,0,0,0,0,0};
+ uint8_t resp[ICLASS_BUFFER_SIZE];
+ memset(resp, 0xFF, sizeof(resp));
+ //Read conf block CRC(0x01) => 0xfa 0x22
+ uint8_t readConf[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x01, 0xfa, 0x22};
+ //Read App Issuer Area block CRC(0x05) => 0xde 0x64
+ uint8_t readAA[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x05, 0xde, 0x64};
+
+ int read_status= 0;
+ uint8_t result_status = 0;
+ // flag to read until one tag is found successfully
+ bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
+ // flag to only try 5 times to find one tag then return
+ bool try_once = arg0 & FLAG_ICLASS_READER_ONE_TRY;
+ // if neither abort_after_read nor try_once then continue reading until button pressed.
+
+ bool use_credit_key = arg0 & FLAG_ICLASS_READER_CEDITKEY;
+ // test flags for what blocks to be sure to read
+ uint8_t flagReadConfig = arg0 & FLAG_ICLASS_READER_CONF;
+ uint8_t flagReadCC = arg0 & FLAG_ICLASS_READER_CC;
+ uint8_t flagReadAA = arg0 & FLAG_ICLASS_READER_AA;
+
+ set_tracing(true);
+ setupIclassReader();
+
+ uint16_t tryCnt=0;
+ bool userCancelled = BUTTON_PRESS() || usb_poll_validate_length();
+ while(!userCancelled)
+ {
+ // if only looking for one card try 2 times if we missed it the first time
+ if (try_once && tryCnt > 2) break;
+ tryCnt++;
+ if(!tracing) {
+ DbpString("Trace full");
+ break;
+ }
+ WDT_HIT();
+
+ read_status = handshakeIclassTag_ext(card_data, use_credit_key);
+
+ if(read_status == 0) continue;
+ if(read_status == 1) result_status = FLAG_ICLASS_READER_CSN;
+ if(read_status == 2) result_status = FLAG_ICLASS_READER_CSN|FLAG_ICLASS_READER_CC;
+
+ // handshakeIclass returns CSN|CC, but the actual block
+ // layout is CSN|CONFIG|CC, so here we reorder the data,
+ // moving CC forward 8 bytes
+ memcpy(card_data+16,card_data+8, 8);
+ //Read block 1, config
+ if(flagReadConfig) {
+ if(sendCmdGetResponseWithRetries(readConf, sizeof(readConf), resp, 10, 10))
+ {
+ result_status |= FLAG_ICLASS_READER_CONF;
+ memcpy(card_data+8, resp, 8);
+ } else {
+ Dbprintf("Failed to dump config block");
+ }
+ }
+
+ //Read block 5, AA
+ if(flagReadAA) {
+ if(sendCmdGetResponseWithRetries(readAA, sizeof(readAA), resp, 10, 10))
+ {
+ result_status |= FLAG_ICLASS_READER_AA;
+ memcpy(card_data+(8*5), resp, 8);
+ } else {
+ //Dbprintf("Failed to dump AA block");
+ }
+ }
+
+ // 0 : CSN
+ // 1 : Configuration
+ // 2 : e-purse
+ // (3,4 write-only, kc and kd)
+ // 5 Application issuer area
+ //
+ //Then we can 'ship' back the 8 * 6 bytes of data,
+ // with 0xFF:s in block 3 and 4.
+
+ LED_B_ON();
+ //Send back to client, but don't bother if we already sent this -
+ // only useful if looping in arm (not try_once && not abort_after_read)
+ if(memcmp(last_csn, card_data, 8) != 0)
+ {
+ // If caller requires that we get Conf, CC, AA, continue until we got it
+ if( (result_status ^ FLAG_ICLASS_READER_CSN ^ flagReadConfig ^ flagReadCC ^ flagReadAA) == 0) {
+ cmd_send(CMD_ACK,result_status,0,0,card_data,sizeof(card_data));
+ if(abort_after_read) {
+ LED_A_OFF();
+ LED_B_OFF();
+ return;
+ }
+ //Save that we already sent this....
+ memcpy(last_csn, card_data, 8);
+ }
+
+ }
+ LED_B_OFF();
+ userCancelled = BUTTON_PRESS() || usb_poll_validate_length();
+ }
+ if (userCancelled) {
+ cmd_send(CMD_ACK,0xFF,0,0,card_data, 0);
+ } else {
+ cmd_send(CMD_ACK,0,0,0,card_data, 0);
+ }
+ LED_A_OFF();
+}
+
+void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
+
+ uint8_t card_data[USB_CMD_DATA_SIZE]={0};
+ uint16_t block_crc_LUT[255] = {0};
+
+ {//Generate a lookup table for block crc
+ for(int block = 0; block < 255; block++){
+ char bl = block;
+ block_crc_LUT[block] = iclass_crc16(&bl ,1);
+ }
+ }
+ //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
+
+ uint8_t check[] = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ uint8_t read[] = { 0x0c, 0x00, 0x00, 0x00 };
+
+ uint16_t crc = 0;
+ uint8_t cardsize=0;
+ uint8_t mem=0;
+
+ static struct memory_t{
+ int k16;
+ int book;
+ int k2;
+ int lockauth;
+ int keyaccess;
+ } memory;
+
+ uint8_t resp[ICLASS_BUFFER_SIZE];
+
+ setupIclassReader();
+ set_tracing(TRUE);
+
+ while(!BUTTON_PRESS()) {
+
+ WDT_HIT();
+
+ if(!tracing) {
+ DbpString("Trace full");
+ break;
+ }
+
+ uint8_t read_status = handshakeIclassTag(card_data);
+ if(read_status < 2) continue;
+
+ //for now replay captured auth (as cc not updated)
+ memcpy(check+5,MAC,4);
+
+ if(!sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
+ {
+ Dbprintf("Error: Authentication Fail!");
+ continue;
+ }
+
+ //first get configuration block (block 1)
+ crc = block_crc_LUT[1];
+ read[1]=1;
+ read[2] = crc >> 8;
+ read[3] = crc & 0xff;
+
+ if(!sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
+ {
+ Dbprintf("Dump config (block 1) failed");
+ continue;
+ }
+
+ mem=resp[5];
+ memory.k16= (mem & 0x80);
+ memory.book= (mem & 0x20);
+ memory.k2= (mem & 0x8);
+ memory.lockauth= (mem & 0x2);
+ memory.keyaccess= (mem & 0x1);
+
+ cardsize = memory.k16 ? 255 : 32;
+ WDT_HIT();
+ //Set card_data to all zeroes, we'll fill it with data
+ memset(card_data,0x0,USB_CMD_DATA_SIZE);
+ uint8_t failedRead =0;
+ uint32_t stored_data_length =0;
+ //then loop around remaining blocks
+ for(int block=0; block < cardsize; block++){
+
+ read[1]= block;
+ crc = block_crc_LUT[block];
+ read[2] = crc >> 8;
+ read[3] = crc & 0xff;
+
+ if(sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
+ {
+ Dbprintf(" %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
+ block, resp[0], resp[1], resp[2],
+ resp[3], resp[4], resp[5],
+ resp[6], resp[7]);
+
+ //Fill up the buffer
+ memcpy(card_data+stored_data_length,resp,8);
+ stored_data_length += 8;
+ if(stored_data_length +8 > USB_CMD_DATA_SIZE)
+ {//Time to send this off and start afresh
+ cmd_send(CMD_ACK,
+ stored_data_length,//data length
+ failedRead,//Failed blocks?
+ 0,//Not used ATM
+ card_data, stored_data_length);
+ //reset
+ stored_data_length = 0;
+ failedRead = 0;
+ }
+
+ }else{
+ failedRead = 1;
+ stored_data_length +=8;//Otherwise, data becomes misaligned
+ Dbprintf("Failed to dump block %d", block);
+ }
+ }
+
+ //Send off any remaining data
+ if(stored_data_length > 0)
+ {
+ cmd_send(CMD_ACK,
+ stored_data_length,//data length
+ failedRead,//Failed blocks?
+ 0,//Not used ATM
+ card_data, stored_data_length);
+ }
+ //If we got here, let's break
+ break;
+ }
+ //Signal end of transmission
+ cmd_send(CMD_ACK,
+ 0,//data length
+ 0,//Failed blocks?
+ 0,//Not used ATM
+ card_data, 0);
+
+ LED_A_OFF();
+}
+
+void iClass_ReadCheck(uint8_t blockNo, uint8_t keyType) {
+ uint8_t readcheck[] = { keyType, blockNo };
+ uint8_t resp[] = {0,0,0,0,0,0,0,0};
+ size_t isOK = 0;
+ isOK = sendCmdGetResponseWithRetries(readcheck, sizeof(readcheck), resp, sizeof(resp), 6);
+ cmd_send(CMD_ACK,isOK,0,0,0,0);
+}
+
+void iClass_Authentication(uint8_t *MAC) {
+ uint8_t check[] = { ICLASS_CMD_CHECK, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ uint8_t resp[ICLASS_BUFFER_SIZE];
+ memcpy(check+5,MAC,4);
+ bool isOK;
+ isOK = sendCmdGetResponseWithRetries(check, sizeof(check), resp, 4, 6);
+ cmd_send(CMD_ACK,isOK,0,0,0,0);
+}
+bool iClass_ReadBlock(uint8_t blockNo, uint8_t *readdata) {
+ uint8_t readcmd[] = {ICLASS_CMD_READ_OR_IDENTIFY, blockNo, 0x00, 0x00}; //0x88, 0x00 // can i use 0C?
+ char bl = blockNo;
+ uint16_t rdCrc = iclass_crc16(&bl, 1);
+ readcmd[2] = rdCrc >> 8;
+ readcmd[3] = rdCrc & 0xff;
+ uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};
+ bool isOK = false;
+
+ //readcmd[1] = blockNo;
+ isOK = sendCmdGetResponseWithRetries(readcmd, sizeof(readcmd), resp, 10, 10);
+ memcpy(readdata, resp, sizeof(resp));
+
+ return isOK;
+}
+
+void iClass_ReadBlk(uint8_t blockno) {
+ uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};
+ bool isOK = false;
+ isOK = iClass_ReadBlock(blockno, readblockdata);
+ cmd_send(CMD_ACK, isOK, 0, 0, readblockdata, 8);
+}
+
+void iClass_Dump(uint8_t blockno, uint8_t numblks) {
+ uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};
+ bool isOK = false;
+ uint8_t blkCnt = 0;
+
+ BigBuf_free();
+ uint8_t *dataout = BigBuf_malloc(255*8);
+ if (dataout == NULL){
+ Dbprintf("out of memory");
+ OnError(1);
+ return;
+ }
+ memset(dataout,0xFF,255*8);
+
+ for (;blkCnt < numblks; blkCnt++) {
+ isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);
+ if (!isOK || (readblockdata[0] == 0xBB || readblockdata[7] == 0xBB || readblockdata[2] == 0xBB)) { //try again
+ isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);
+ if (!isOK) {
+ Dbprintf("Block %02X failed to read", blkCnt+blockno);
+ break;
+ }
+ }
+ memcpy(dataout+(blkCnt*8),readblockdata,8);
+ }
+ //return pointer to dump memory in arg3
+ cmd_send(CMD_ACK,isOK,blkCnt,BigBuf_max_traceLen(),0,0);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
+ BigBuf_free();
+}
+
+bool iClass_WriteBlock_ext(uint8_t blockNo, uint8_t *data) {
+ uint8_t write[] = { ICLASS_CMD_UPDATE, blockNo, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ //uint8_t readblockdata[10];
+ //write[1] = blockNo;
+ memcpy(write+2, data, 12); // data + mac
+ char *wrCmd = (char *)(write+1);
+ uint16_t wrCrc = iclass_crc16(wrCmd, 13);
+ write[14] = wrCrc >> 8;
+ write[15] = wrCrc & 0xff;
+ uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};
+ bool isOK = false;
+
+ isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);
+ if (isOK) { //if reader responded correctly
+ //Dbprintf("WriteResp: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",resp[0],resp[1],resp[2],resp[3],resp[4],resp[5],resp[6],resp[7],resp[8],resp[9]);
+ if (memcmp(write+2,resp,8)) { //if response is not equal to write values
+ if (blockNo != 3 && blockNo != 4) { //if not programming key areas (note key blocks don't get programmed with actual key data it is xor data)
+ //error try again
+ isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);
+ }
+
+ }
+ }
+ return isOK;
+}
+
+void iClass_WriteBlock(uint8_t blockNo, uint8_t *data) {
+ bool isOK = iClass_WriteBlock_ext(blockNo, data);
+ if (isOK){
+ Dbprintf("Write block [%02x] successful",blockNo);
+ } else {
+ Dbprintf("Write block [%02x] failed",blockNo);
+ }
+ cmd_send(CMD_ACK,isOK,0,0,0,0);
+}
+
+void iClass_Clone(uint8_t startblock, uint8_t endblock, uint8_t *data) {
+ int i;
+ int written = 0;
+ int total_block = (endblock - startblock) + 1;
+ for (i = 0; i < total_block;i++){
+ // block number
+ if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){
+ Dbprintf("Write block [%02x] successful",i + startblock);
+ written++;
+ } else {
+ if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){
+ Dbprintf("Write block [%02x] successful",i + startblock);
+ written++;
+ } else {
+ Dbprintf("Write block [%02x] failed",i + startblock);
+ }
+ }
+ }
+ if (written == total_block)
+ Dbprintf("Clone complete");
+ else
+ Dbprintf("Clone incomplete");
+
+ cmd_send(CMD_ACK,1,0,0,0,0);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
+}
projects / proxmark3-svn / blobdiff