// Routines to support ISO 14443B. This includes both the reader software and
// the `fake tag' modes.
//-----------------------------------------------------------------------------
+#include "iso14443b.h"
-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-#include "iso14443crc.h"
-#include "common.h"
-#define RECEIVE_SAMPLES_TIMEOUT 600000
+#define RECEIVE_SAMPLES_TIMEOUT 20000
#define ISO14443B_DMA_BUFFER_SIZE 256
-
-// PCB Block number for APDUs
+// the block number for the ISO14443-4 PCB (used with APDUs)
static uint8_t pcb_blocknum = 0;
//=============================================================================
// a response.
//=============================================================================
+
+//-----------------------------------------------------------------------------
+// The software UART that receives commands from the reader, and its state
+// variables.
+//-----------------------------------------------------------------------------
+static struct {
+ enum {
+ STATE_UNSYNCD,
+ STATE_GOT_FALLING_EDGE_OF_SOF,
+ STATE_AWAITING_START_BIT,
+ STATE_RECEIVING_DATA
+ } state;
+ uint16_t shiftReg;
+ int bitCnt;
+ int byteCnt;
+ int byteCntMax;
+ int posCnt;
+ uint8_t *output;
+} Uart;
+
+static void UartReset()
+{
+ Uart.byteCntMax = MAX_FRAME_SIZE;
+ Uart.state = STATE_UNSYNCD;
+ Uart.byteCnt = 0;
+ Uart.bitCnt = 0;
+ Uart.posCnt = 0;
+ memset(Uart.output, 0x00, MAX_FRAME_SIZE);
+}
+
+static void UartInit(uint8_t *data)
+{
+ Uart.output = data;
+ UartReset();
+}
+
+
+static struct {
+ enum {
+ DEMOD_UNSYNCD,
+ DEMOD_PHASE_REF_TRAINING,
+ DEMOD_AWAITING_FALLING_EDGE_OF_SOF,
+ DEMOD_GOT_FALLING_EDGE_OF_SOF,
+ DEMOD_AWAITING_START_BIT,
+ DEMOD_RECEIVING_DATA
+ } state;
+ int bitCount;
+ int posCount;
+ int thisBit;
+/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
+ int metric;
+ int metricN;
+*/
+ uint16_t shiftReg;
+ uint8_t *output;
+ int len;
+ int sumI;
+ int sumQ;
+} Demod;
+
+static void DemodReset()
+{
+ // Clear out the state of the "UART" that receives from the tag.
+ Demod.len = 0;
+ Demod.state = DEMOD_UNSYNCD;
+ Demod.posCount = 0;
+ Demod.sumI = 0;
+ Demod.sumQ = 0;
+ Demod.bitCount = 0;
+ Demod.thisBit = 0;
+ Demod.shiftReg = 0;
+ //memset(Demod.output, 0x00, MAX_FRAME_SIZE);
+}
+
+
+static void DemodInit(uint8_t *data)
+{
+ Demod.output = data;
+ DemodReset();
+}
+
+
+void AppendCrc14443b(uint8_t* data, int len)
+{
+ ComputeCrc14443(CRC_14443_B,data,len,data+len,data+len+1);
+}
+
//-----------------------------------------------------------------------------
// Code up a string of octets at layer 2 (including CRC, we don't generate
// that here) so that they can be transmitted to the reader. Doesn't transmit
}
// Convert from last byte pos to length
- ToSendMax++;
+ ++ToSendMax;
}
-//-----------------------------------------------------------------------------
-// The software UART that receives commands from the reader, and its state
-// variables.
-//-----------------------------------------------------------------------------
-static struct {
- enum {
- STATE_UNSYNCD,
- STATE_GOT_FALLING_EDGE_OF_SOF,
- STATE_AWAITING_START_BIT,
- STATE_RECEIVING_DATA
- } state;
- uint16_t shiftReg;
- int bitCnt;
- int byteCnt;
- int byteCntMax;
- int posCnt;
- uint8_t *output;
-} Uart;
+
/* Receive & handle a bit coming from the reader.
*
return FALSE;
}
-
-static void UartReset()
-{
- Uart.byteCntMax = MAX_FRAME_SIZE;
- Uart.state = STATE_UNSYNCD;
- Uart.byteCnt = 0;
- Uart.bitCnt = 0;
- Uart.posCnt = 0;
- memset(Uart.output, 0x00, MAX_FRAME_SIZE);
-}
-
-
-static void UartInit(uint8_t *data)
-{
- Uart.output = data;
- UartReset();
-}
-
-
//-----------------------------------------------------------------------------
// Receive a command (from the reader to us, where we are the simulated tag),
// and store it in the given buffer, up to the given maximum length. Keeps
void SimulateIso14443bTag(void)
{
// the only commands we understand is WUPB, AFI=0, Select All, N=1:
- static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB
+ static const uint8_t cmd1[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 }; // WUPB
// ... and REQB, AFI=0, Normal Request, N=1:
- static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB
+ static const uint8_t cmd2[] = { ISO14443B_REQB, 0x00, 0x00, 0x71, 0xFF }; // REQB
// ... and HLTB
- static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB
+ static const uint8_t cmd3[] = { ISO14443B_HALT, 0xff, 0xff, 0xff, 0xff }; // HLTB
// ... and ATTRIB
- static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
+ static const uint8_t cmd4[] = { ISO14443B_ATTRIB, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
// ... and we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922,
// supports only 106kBit/s in both directions, max frame size = 32Bytes,
};
// response to HLTB and ATTRIB
static const uint8_t response2[] = {0x00, 0x78, 0xF0};
-
- uint8_t parity[MAX_PARITY_SIZE];
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
uint16_t respLen, respCodeLen;
// allocate command receive buffer
- BigBuf_free();
+ BigBuf_free(); BigBuf_Clear_ext(false);
+
uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
uint16_t len;
for(;;) {
- if(!GetIso14443bCommandFromReader(receivedCmd, &len)) {
- Dbprintf("button pressed, received %d commands", cmdsRecvd);
- break;
+ if (!GetIso14443bCommandFromReader(receivedCmd, &len)) {
+ Dbprintf("button pressed, received %d commands", cmdsRecvd);
+ break;
}
- if (tracing) {
- LogTrace(receivedCmd, len, 0, 0, parity, TRUE);
- }
+ if (tracing)
+ LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);
+
// Good, look at the command now.
if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0)
respCodeLen = resp2CodeLen;
} else {
Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
+
// And print whether the CRC fails, just for good measure
uint8_t b1, b2;
if (len >= 3){ // if crc exists
- ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
- if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
- // Not so good, try again.
- DbpString("+++CRC fail");
-
- } else {
- DbpString("CRC passes");
- }
+ ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
+ if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
+ // Not so good, try again.
+ DbpString("+++CRC fail");
+
+ } else {
+ DbpString("CRC passes");
+ }
}
//get rid of compiler warning
respCodeLen = 0;
//break;
}
- cmdsRecvd++;
+ ++cmdsRecvd;
- if(cmdsRecvd > 0x30) {
+ if(cmdsRecvd > 0xFF) {
DbpString("many commands later...");
break;
}
AT91C_BASE_SSC->SSC_THR = 0xff;
FpgaSetupSsc();
- uint8_t c;
- // clear receiving shift register and holding register
- while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
- c = AT91C_BASE_SSC->SSC_RHR; (void) c;
- while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
- c = AT91C_BASE_SSC->SSC_RHR; (void) c;
-
- // Clear TXRDY:
- AT91C_BASE_SSC->SSC_THR = 0x00;
-
// Transmit the response.
- uint16_t FpgaSendQueueDelay = 0;
uint16_t i = 0;
- for(;i < respCodeLen; ) {
+ volatile uint8_t b;
+ for(;;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = respCode[i++];
- FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ uint8_t b = respCode[i];
+
+ AT91C_BASE_SSC->SSC_THR = b;
+
+ ++i;
+ if(i > respCodeLen)
+ break;
+
}
- if(BUTTON_PRESS()) break;
- }
-
- // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
- uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
- for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x00;
- FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- i++;
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ (void)b;
}
}
- // trace the response:
- if (tracing) LogTrace(resp, respLen, 0, 0, parity, FALSE);
+ if (tracing)
+ LogTrace(resp, respLen, 0, 0, NULL, FALSE);
}
- FpgaDisableSscDma();
}
//=============================================================================
// PC side.
//=============================================================================
-static struct {
- enum {
- DEMOD_UNSYNCD,
- DEMOD_PHASE_REF_TRAINING,
- DEMOD_AWAITING_FALLING_EDGE_OF_SOF,
- DEMOD_GOT_FALLING_EDGE_OF_SOF,
- DEMOD_AWAITING_START_BIT,
- DEMOD_RECEIVING_DATA
- } state;
- int bitCount;
- int posCount;
- int thisBit;
-/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
- int metric;
- int metricN;
-*/
- uint16_t shiftReg;
- uint8_t *output;
- int len;
- int sumI;
- int sumQ;
-} Demod;
-
/*
* Handles reception of a bit from the tag
*
* false if we are still waiting for some more
*
*/
- #define abs(x) ( ((x)<0) ? -(x) : (x) )
+#ifndef SUBCARRIER_DETECT_THRESHOLD
+# define SUBCARRIER_DETECT_THRESHOLD 6
+#endif
+
static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
{
int v = 0;
- int ai = abs(ci);
- int aq = abs(cq);
- int halfci = (ai >> 1);
- int halfcq = (aq >> 1);
-
// The soft decision on the bit uses an estimate of just the
// quadrant of the reference angle, not the exact angle.
#define MAKE_SOFT_DECISION() { \
} \
}
-#define SUBCARRIER_DETECT_THRESHOLD 8
-
+// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq)
+/* #define CHECK_FOR_SUBCARRIER() { \
+ v = ci; \
+ if(v < 0) v = -v; \
+ if(cq > 0) { \
+ v += cq; \
+ } else { \
+ v -= cq; \
+ } \
+ }
+ */
// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
#define CHECK_FOR_SUBCARRIER() { \
- v = MAX(ai, aq) + MIN(halfci, halfcq); \
-}
+ if(ci < 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 */ \
+ if (cq < -ci) { \
+ v = -ci + (cq >> 1); \
+ } else { \
+ v = cq - (ci >> 1); \
+ } \
+ } \
+ } else { \
+ if(cq < 0) { /* ci >= 0, cq < 0 */ \
+ if (-cq < ci) { \
+ v = ci - (cq >> 1); \
+ } else { \
+ v = -cq + (ci >> 1); \
+ } \
+ } else { /* ci >= 0, cq >= 0 */ \
+ if (cq < ci) { \
+ v = ci + (cq >> 1); \
+ } else { \
+ v = cq + (ci >> 1); \
+ } \
+ } \
+ } \
+ }
+//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_duo() { \
+ v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \
+ }
switch(Demod.state) {
case DEMOD_UNSYNCD:
+
CHECK_FOR_SUBCARRIER();
- if(v > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected
+
+ // subcarrier detected
+ if(v > SUBCARRIER_DETECT_THRESHOLD) {
Demod.state = DEMOD_PHASE_REF_TRAINING;
Demod.sumI = ci;
Demod.sumQ = cq;
case DEMOD_PHASE_REF_TRAINING:
if(Demod.posCount < 8) {
- //if(Demod.posCount < 10*2) {
+
CHECK_FOR_SUBCARRIER();
+
if (v > SUBCARRIER_DETECT_THRESHOLD) {
// set the reference phase (will code a logic '1') by averaging over 32 1/fs.
// note: synchronization time > 80 1/fs
Demod.sumI += ci;
Demod.sumQ += cq;
- Demod.posCount++;
- } else { // subcarrier lost
+ ++Demod.posCount;
+ } else {
+ // subcarrier lost
Demod.state = DEMOD_UNSYNCD;
}
} else {
break;
case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
+
MAKE_SOFT_DECISION();
+
//Dbprintf("ICE: %d %d %d %d %d", v, Demod.sumI, Demod.sumQ, ci, cq );
- if(v <= 0) { // logic '0' detected
+ if(v < 0) { // logic '0' detected
Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
Demod.posCount = 0; // start of SOF sequence
} else {
- if(Demod.posCount > 25*2) { // maximum length of TR1 = 200 1/fs
- Demod.state = DEMOD_UNSYNCD;
- }
+ // maximum length of TR1 = 200 1/fs
+ if(Demod.posCount > 25*2) Demod.state = DEMOD_UNSYNCD;
}
- Demod.posCount++;
+ ++Demod.posCount;
break;
case DEMOD_GOT_FALLING_EDGE_OF_SOF:
- Demod.posCount++;
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
+
if(v > 0) {
- if(Demod.posCount < 10*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
+ // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
+ if(Demod.posCount < 9*2) {
Demod.state = DEMOD_UNSYNCD;
} else {
LED_C_ON(); // Got SOF
Demod.state = DEMOD_AWAITING_START_BIT;
Demod.posCount = 0;
Demod.len = 0;
-/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
- Demod.metricN = 0;
- Demod.metric = 0;
-*/
}
} else {
- if(Demod.posCount > 13*2) { // low phase of SOF too long (> 12 etu)
+ // low phase of SOF too long (> 12 etu)
+ if (Demod.posCount > 12*2) {
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
}
break;
case DEMOD_AWAITING_START_BIT:
- Demod.posCount++;
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
- if(v > 0) {
+
+ if (v > 0) {
if(Demod.posCount > 3*2) { // max 19us between characters = 16 1/fs, max 3 etu after low phase of SOF = 24 1/fs
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
break;
case DEMOD_RECEIVING_DATA:
+
MAKE_SOFT_DECISION();
- if(Demod.posCount == 0) { // first half of bit
+
+ if (Demod.posCount == 0) {
+ // first half of bit
Demod.thisBit = v;
Demod.posCount = 1;
- } else { // second half of bit
+ } else {
+ // second half of bit
Demod.thisBit += v;
-
-/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
- if(Demod.thisBit > 0) {
- Demod.metric += Demod.thisBit;
- } else {
- Demod.metric -= Demod.thisBit;
- }
- (Demod.metricN)++;
-*/
-
Demod.shiftReg >>= 1;
- if(Demod.thisBit > 0) { // logic '1'
- Demod.shiftReg |= 0x200;
- }
- Demod.bitCount++;
+ // logic '1'
+ if(Demod.thisBit > 0) Demod.shiftReg |= 0x200;
+
+ ++Demod.bitCount;
+
if(Demod.bitCount == 10) {
+
uint16_t s = Demod.shiftReg;
- if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0'
+
+ // stop bit == '1', start bit == '0'
+ if((s & 0x200) && !(s & 0x001)) {
uint8_t b = (s >> 1);
Demod.output[Demod.len] = b;
- Demod.len++;
+ ++Demod.len;
Demod.state = DEMOD_AWAITING_START_BIT;
} else {
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
- if(s == 0x000) {
- // This is EOF (start, stop and all data bits == '0'
- return TRUE;
- }
+
+ // This is EOF (start, stop and all data bits == '0'
+ if(s == 0) return TRUE;
}
}
Demod.posCount = 0;
}
-static void DemodReset()
-{
- // Clear out the state of the "UART" that receives from the tag.
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
- Demod.posCount = 0;
- Demod.sumI = 0;
- Demod.sumQ = 0;
- Demod.bitCount = 0;
- Demod.thisBit = 0;
- Demod.shiftReg = 0;
- memset(Demod.output, 0x00, MAX_FRAME_SIZE);
-}
-
-
-static void DemodInit(uint8_t *data)
-{
- Demod.output = data;
- DemodReset();
-}
-
-
/*
* Demodulate the samples we received from the tag, also log to tracebuffer
* quiet: set to 'TRUE' to disable debug output
// Allocate memory from BigBuf for some buffers
// free all previous allocations first
- BigBuf_free();
-
- // And put the FPGA in the appropriate mode
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
+ ///BigBuf_free();
// The response (tag -> reader) that we're receiving.
// Set up the demodulator for tag -> reader responses.
+ // this init, can take some time to execute, memset
DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
// The DMA buffer, used to stream samples from the FPGA
int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
+ // And put the FPGA in the appropriate mode
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
+
// Setup and start DMA.
FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
}
lastRxCounter -= 2;
- if(lastRxCounter <= 0) {
- lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
- }
+
+ if(lastRxCounter <= 0)
+ lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
samples += 2;
- //
- gotFrame = Handle14443bSamplesDemod(ci , cq );
+ // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103
+ // can we double this?
+ gotFrame = Handle14443bSamplesDemod(ci<<2 , cq<<2);
if ( gotFrame )
break;
}
- if(samples > n || gotFrame) {
+ if(samples > n || gotFrame)
break;
- }
}
+ //disable
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
- if (!quiet && Demod.len == 0) {
- Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d",
+ if (!quiet) {
+ Dbprintf("max behindby = %d, samples = %d, gotFrame = %s, Demod.state = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d",
max,
samples,
- gotFrame,
+ (gotFrame) ? "true" : "false",
+ Demod.state,
Demod.len,
Demod.sumI,
Demod.sumQ
);
}
- //Tracing
- if (tracing && Demod.len > 0) {
- uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE);
- }
+ if (tracing > 0)
+ LogTrace(Demod.output, Demod.len, samples, samples, NULL, FALSE);
}
static void TransmitFor14443b(void)
{
int c;
-
+ volatile uint32_t r;
FpgaSetupSsc();
- while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))
AT91C_BASE_SSC->SSC_THR = 0xff;
- }
// Signal field is ON with the appropriate Red LED
LED_D_ON();
for(c = 0; c < 10;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = 0xff;
- c++;
+ ++c;
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+ r = AT91C_BASE_SSC->SSC_RHR;
(void)r;
}
WDT_HIT();
for(;;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = ToSend[c];
- c++;
- if(c >= ToSendMax) {
+ ++c;
+ if(c >= ToSendMax)
break;
- }
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+ r = AT91C_BASE_SSC->SSC_RHR;
(void)r;
}
WDT_HIT();
ToSendReset();
// Establish initial reference level
- for(i = 0; i < 40; i++) {
+ for(i = 0; i < 40; ++i)
ToSendStuffBit(1);
- }
+
// Send SOF
- for(i = 0; i < 11; i++) {
+ for(i = 0; i < 10; ++i)
ToSendStuffBit(0);
- }
- for(i = 0; i < len; i++) {
+ for(i = 0; i < len; ++i) {
// Stop bits/EGT
ToSendStuffBit(1);
ToSendStuffBit(1);
ToSendStuffBit(0);
// Data bits
b = cmd[i];
- for(j = 0; j < 8; j++) {
- if(b & 1) {
+ for(j = 0; j < 8; ++j) {
+ if(b & 1)
ToSendStuffBit(1);
- } else {
+ else
ToSendStuffBit(0);
- }
+
b >>= 1;
}
}
// Send EOF
ToSendStuffBit(1);
- for(i = 0; i < 11; i++) {
+ for(i = 0; i < 10; ++i)
ToSendStuffBit(0);
- }
- for(i = 0; i < 8; i++) {
+
+ for(i = 0; i < 8; ++i)
ToSendStuffBit(1);
- }
+
// And then a little more, to make sure that the last character makes
// it out before we switch to rx mode.
- for(i = 0; i < 10; i++) {
+ for(i = 0; i < 24; ++i)
ToSendStuffBit(1);
- }
// Convert from last character reference to length
- ToSendMax++;
+ ++ToSendMax;
}
{
CodeIso14443bAsReader(cmd, len);
TransmitFor14443b();
- if (tracing) {
- uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(cmd,len, 0, 0, parity, TRUE);
- }
+
+ if(trigger) LED_A_ON();
+
+ if (tracing) LogTrace(cmd, len, 0, 0, NULL, TRUE);
}
/* 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 iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response)
{
+ uint8_t crc[2] = {0x00, 0x00};
uint8_t message_frame[message_length + 4];
// PCB
message_frame[0] = 0x0A | pcb_blocknum;
// send
CodeAndTransmit14443bAsReader(message_frame, message_length + 4);
// get response
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE);
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
if(Demod.len < 3)
- {
return 0;
- }
- // TODO: Check CRC
+
+ // VALIDATE CRC
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if ( crc[0] != Demod.output[Demod.len-2] || crc[1] != Demod.output[Demod.len-1] )
+ return 0;
+
// copy response contents
if(response != NULL)
- {
memcpy(response, Demod.output, Demod.len);
- }
+
return Demod.len;
}
+/**
+* SRx Initialise.
+*/
+uint8_t iso14443b_select_srx_card(iso14b_card_select_t *card )
+{
+ // INITIATE command: wake up the tag using the INITIATE
+ static const uint8_t init_srx[] = { ISO14443B_INITIATE, 0x00, 0x97, 0x5b };
+ // SELECT command (with space for CRC)
+ uint8_t select_srx[] = { ISO14443B_SELECT, 0x00, 0x00, 0x00};
+ // temp to calc crc.
+ uint8_t crc[2] = {0x00, 0x00};
+
+ CodeAndTransmit14443bAsReader(init_srx, sizeof(init_srx));
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+
+ if (Demod.len == 0) return 2;
+
+ // Randomly generated Chip ID
+ if (card) card->chipid = Demod.output[0];
+
+ select_srx[1] = Demod.output[0];
+
+ ComputeCrc14443(CRC_14443_B, select_srx, 2, &select_srx[2], &select_srx[3]);
+ CodeAndTransmit14443bAsReader(select_srx, sizeof(select_srx));
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+
+ if (Demod.len != 3) return 2;
+
+ // Check the CRC of the answer:
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2 , &crc[0], &crc[1]);
+ if(crc[0] != Demod.output[1] || crc[1] != Demod.output[2]) return 3;
+
+ // Check response from the tag: should be the same UID as the command we just sent:
+ if (select_srx[1] != Demod.output[0]) return 1;
+
+ // First get the tag's UID:
+ select_srx[0] = ISO14443B_GET_UID;
+
+ ComputeCrc14443(CRC_14443_B, select_srx, 1 , &select_srx[1], &select_srx[2]);
+ CodeAndTransmit14443bAsReader(select_srx, 3); // Only first three bytes for this one
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+
+ if (Demod.len != 10) return 2;
+
+ // The check the CRC of the answer
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if(crc[0] != Demod.output[8] || crc[1] != Demod.output[9]) return 3;
+
+ if (card) {
+ card->uidlen = 8;
+ memcpy(card->uid, Demod.output, 8);
+ }
+
+ return 0;
+}
/* 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()
+uint8_t iso14443b_select_card(iso14b_card_select_t *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 };
+ static const uint8_t wupb[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 };
// ATTRIB command (with space for CRC)
- uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+ uint8_t attrib[] = { ISO14443B_ATTRIB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+ // temp to calc crc.
+ uint8_t crc[2] = {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;
+ if (Demod.len < 14) return 2;
+
+ // VALIDATE CRC
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if ( crc[0] != Demod.output[12] || crc[1] != Demod.output[13] )
+ return 3;
+
+ if (card) {
+ card->uidlen = 4;
+ memcpy(card->uid, Demod.output+1, 4);
+ memcpy(card->atqb, Demod.output+5, 7);
}
- // 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) */
+
+ // 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;
- }
+ if(Demod.len < 3) return 2;
+
+ // VALIDATE CRC
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if ( crc[0] != Demod.output[1] || crc[1] != Demod.output[2] )
+ return 3;
+
+ // CID
+ if (card) card->cid = Demod.output[0];
+
// reset PCB block number
pcb_blocknum = 0;
- return 1;
+ return 0;
}
// Set up ISO 14443 Type B communication (similar to iso14443a_setup)
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BigBuf_free();
+ BigBuf_free(); BigBuf_Clear_ext(false);
+ DemodReset();
+ UartReset();
+
// 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);
-
- //SpinDelay(100);
+ SpinDelay(400);
// Start the timer
- //StartCountSspClk();
-
- DemodReset();
- UartReset();
+ StartCountSspClk();
}
//-----------------------------------------------------------------------------
//
// I tried to be systematic and check every answer of the tag, every CRC, etc...
//-----------------------------------------------------------------------------
-void ReadSTMemoryIso14443b(uint32_t dwLast)
+void ReadSTMemoryIso14443b(uint8_t numofblocks)
{
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BigBuf_free();
-
clear_trace();
set_tracing(TRUE);
// Signal field is on with the appropriate LED
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
- SpinDelay(200);
+ SpinDelay(300);
// First command: wake up the tag using the INITIATE command
- uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b};
+ uint8_t cmd1[] = {ISO14443B_INITIATE, 0x00, 0x97, 0x5b};
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
if (Demod.len == 0) {
DbpString("No response from tag");
+ set_tracing(FALSE);
return;
} else {
Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x",
// There is a response, SELECT the uid
DbpString("Now SELECT tag:");
- cmd1[0] = 0x0E; // 0x0E is SELECT
+ cmd1[0] = ISO14443B_SELECT; // 0x0E is SELECT
cmd1[1] = Demod.output[0];
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
if (Demod.len != 3) {
Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
+ set_tracing(FALSE);
return;
}
// Check the CRC of the answer:
ComputeCrc14443(CRC_14443_B, Demod.output, 1 , &cmd1[2], &cmd1[3]);
if(cmd1[2] != Demod.output[1] || cmd1[3] != Demod.output[2]) {
DbpString("CRC Error reading select response.");
+ set_tracing(FALSE);
return;
}
// Check response from the tag: should be the same UID as the command we just sent:
if (cmd1[1] != Demod.output[0]) {
Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]);
+ set_tracing(FALSE);
return;
}
// Tag is now selected,
// First get the tag's UID:
- cmd1[0] = 0x0B;
+ cmd1[0] = ISO14443B_GET_UID;
ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]);
CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
if (Demod.len != 10) {
Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
+ set_tracing(FALSE);
return;
}
// The check the CRC of the answer (use cmd1 as temporary variable):
(Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
// Now loop to read all 16 blocks, address from 0 to last block
- Dbprintf("Tag memory dump, block 0 to %d", dwLast);
+ Dbprintf("Tag memory dump, block 0 to %d", numofblocks);
cmd1[0] = 0x08;
i = 0x00;
- dwLast++;
+ ++numofblocks;
+
for (;;) {
- if (i == dwLast) {
+ if (i == numofblocks) {
DbpString("System area block (0xff):");
i = 0xff;
}
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+
if (Demod.len != 6) { // Check if we got an answer from the tag
- DbpString("Expected 6 bytes from tag, got less...");
- return;
+ DbpString("Expected 6 bytes from tag, got less...");
+ return;
}
// The check the CRC of the answer (use cmd1 as temporary variable):
ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]);
Dbprintf("Address=%02x, Contents=%08x, CRC=%04x", i,
(Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
(Demod.output[4]<<8)+Demod.output[5]);
- if (i == 0xff) {
- break;
- }
- i++;
+
+ if (i == 0xff) break;
+ ++i;
}
+
+ set_tracing(FALSE);
}
-
//=============================================================================
// Finally, the `sniffer' combines elements from both the reader and
// simulated tag, to show both sides of the conversation.
int triggered = TRUE; // TODO: set and evaluate trigger condition
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BigBuf_free();
+ BigBuf_free(); BigBuf_Clear_ext(false);
clear_trace();
set_tracing(TRUE);
upTo = dmaBuf;
lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
- uint8_t parity[MAX_PARITY_SIZE];
bool TagIsActive = FALSE;
bool ReaderIsActive = FALSE;
for(;;) {
int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
(ISO14443B_DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- }
+ if(behindBy > maxBehindBy) maxBehindBy = behindBy;
if(behindBy < 2) continue;
ci = upTo[0];
Dbprintf("blew circular buffer! behindBy=%d", behindBy);
break;
}
+
if(!tracing) {
- DbpString("Reached trace limit");
+ DbpString("Trace full");
break;
}
+
if(BUTTON_PRESS()) {
DbpString("cancelled");
break;
samples += 2;
if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
- if(Handle14443bUartBit(ci & 0x01)) {
- if(triggered && tracing) {
- LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
+ if (Handle14443bUartBit(ci & 0x01)) {
+
+ if(triggered && tracing)
+ LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, TRUE);
+
+ /* And ready to receive another command. */
+ UartReset();
+ /* And also reset the demod code, which might have been */
+ /* false-triggered by the commands from the reader. */
+ DemodReset();
}
- /* And ready to receive another command. */
- UartReset();
- /* And also reset the demod code, which might have been */
- /* false-triggered by the commands from the reader. */
- DemodReset();
- }
- if(Handle14443bUartBit(cq & 0x01)) {
- if(triggered && tracing) {
- LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
+
+ if (Handle14443bUartBit(cq & 0x01)) {
+ if(triggered && tracing)
+ LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, TRUE);
+
+ /* And ready to receive another command. */
+ UartReset();
+ /* And also reset the demod code, which might have been */
+ /* false-triggered by the commands from the reader. */
+ DemodReset();
}
- /* And ready to receive another command. */
- UartReset();
- /* And also reset the demod code, which might have been */
- /* false-triggered by the commands from the reader. */
- DemodReset();
- }
ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF);
}
if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time
// is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103
- if(Handle14443bSamplesDemod(ci & 0xfe, cq & 0xfe)) {
+ if(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) {
- //Use samples as a time measurement
- if(tracing)
- {
- //uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(Demod.output, Demod.len, samples, samples, parity, FALSE);
- }
- triggered = TRUE;
+ //Use samples as a time measurement
+ if(tracing)
+ LogTrace(Demod.output, Demod.len, samples, samples, NULL, FALSE);
- // And ready to receive another response.
- DemodReset();
- }
+ triggered = TRUE;
+
+ // And ready to receive another response.
+ DemodReset();
+ }
TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF);
}
-
}
FpgaDisableSscDma();
LEDsoff();
+
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
DbpString("Snoop statistics:");
Dbprintf(" Max behind by: %i", maxBehindBy);
Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt);
Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax);
Dbprintf(" Trace length: %i", BigBuf_get_traceLen());
+ set_tracing(FALSE);
}
+void iso14b_set_trigger(bool enable) {
+ trigger = enable;
+}
/*
* Send raw command to tag ISO14443B
* @Input
- * datalen len of buffer data
- * recv bool when true wait for data from tag and send to client
- * powerfield bool leave the field on when true
- * data buffer with byte to send
+ * param flags enum ISO14B_COMMAND. (mifare.h)
+ * len len of buffer data
+ * data buffer with bytes to send
*
* @Output
* none
*
*/
-void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[])
+void SendRawCommand14443B_Ex(UsbCommand *c)
{
- iso14443b_setup();
+ iso14b_command_t param = c->arg[0];
+ size_t len = c->arg[1] & 0xffff;
+ uint8_t *cmd = c->d.asBytes;
+ uint8_t status = 0;
+ uint32_t sendlen = sizeof(iso14b_card_select_t);
+ uint8_t buf[USB_CMD_DATA_SIZE] = {0x00};
+
+ if (MF_DBGLEVEL > 3) Dbprintf("param, %04x", param );
- if ( datalen == 0 && recv == 0 && powerfield == 0){
-
- } else {
- set_tracing(TRUE);
- CodeAndTransmit14443bAsReader(data, datalen);
+ // turn on trigger (LED_A)
+ if (param & ISO14B_REQUEST_TRIGGER)
+ iso14b_set_trigger(TRUE);
+
+ if (param & ISO14B_CONNECT) {
+ // Make sure that we start from off, since the tags are stateful;
+ // confusing things will happen if we don't reset them between reads.
+ LED_D_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ SpinDelay(200);
+ clear_trace();
+ iso14443b_setup();
}
+
+ set_tracing(TRUE);
- if(recv) {
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, FALSE);
- uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
- cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+ if ( param & ISO14B_SELECT_STD) {
+ iso14b_card_select_t *card = (iso14b_card_select_t*)buf;
+ status = iso14443b_select_card(card);
+ cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen);
+ // 0: OK 2: attrib fail, 3:crc fail,
+ if ( status > 0 ) return;
+ }
+
+ if ( param & ISO14B_SELECT_SR) {
+ iso14b_card_select_t *card = (iso14b_card_select_t*)buf;
+ status = iso14443b_select_srx_card(card);
+ cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen);
+ // 0: OK 2: attrib fail, 3:crc fail,
+ if ( status > 0 ) return;
+ }
+
+ if (param & ISO14B_APDU) {
+ status = iso14443b_apdu(cmd, len, buf);
+ cmd_send(CMD_ACK, status, status, 0, buf, status);
+ }
+
+ if (param & ISO14B_RAW) {
+ if(param & ISO14B_APPEND_CRC) {
+ AppendCrc14443b(cmd, len);
+ len += 2;
+ }
+
+ CodeAndTransmit14443bAsReader(cmd, len);
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+
+ sendlen = MIN(Demod.len, USB_CMD_DATA_SIZE);
+ status = (Demod.len > 0) ? 0 : 1;
+ cmd_send(CMD_ACK, status, sendlen, 0, Demod.output, sendlen);
}
- if(!powerfield) {
+ // turn off trigger (LED_A)
+ if (param & ISO14B_REQUEST_TRIGGER)
+ iso14a_set_trigger(FALSE);
+
+ // turn off antenna et al
+ // we don't send a HALT command.
+ if ( param & ISO14B_DISCONNECT) {
+ if (MF_DBGLEVEL > 3) Dbprintf("disconnect");
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
FpgaDisableSscDma();
- LED_D_OFF();
+ set_tracing(FALSE);
+ LEDsoff();
}
-}
-
+}
\ No newline at end of file
projects / proxmark3-svn / blobdiff