//-----------------------------------------------------------------------------
-// Merlok - June 2011
+// Merlok - June 2011, 2012
// Gerhard de Koning Gans - May 2008
// Hagen Fritsch - June 2010
//
// The software UART that receives commands from the reader, and its state
// variables.
//-----------------------------------------------------------------------------
-static struct {
- enum {
- STATE_UNSYNCD,
- STATE_START_OF_COMMUNICATION,
- STATE_MILLER_X,
- STATE_MILLER_Y,
- STATE_MILLER_Z,
- STATE_ERROR_WAIT
- } state;
- uint16_t shiftReg;
- int bitCnt;
- int byteCnt;
- int byteCntMax;
- int posCnt;
- int syncBit;
- int parityBits;
- int samples;
- int highCnt;
- int bitBuffer;
- enum {
- DROP_NONE,
- DROP_FIRST_HALF,
- DROP_SECOND_HALF
- } drop;
- uint8_t *output;
-} Uart;
+static tUart Uart;
static RAMFUNC int MillerDecoding(int bit)
{
//=============================================================================
// ISO 14443 Type A - Manchester
//=============================================================================
-
-static struct {
- enum {
- DEMOD_UNSYNCD,
- DEMOD_START_OF_COMMUNICATION,
- DEMOD_MANCHESTER_D,
- DEMOD_MANCHESTER_E,
- DEMOD_MANCHESTER_F,
- DEMOD_ERROR_WAIT
- } state;
- int bitCount;
- int posCount;
- int syncBit;
- int parityBits;
- uint16_t shiftReg;
- int buffer;
- int buff;
- int samples;
- int len;
- enum {
- SUB_NONE,
- SUB_FIRST_HALF,
- SUB_SECOND_HALF
- } sub;
- uint8_t *output;
-} Demod;
+static tDemod Demod;
static RAMFUNC int ManchesterDecoding(int v)
{
response3a[0] = sak & 0xFB;
ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
+ uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
+ 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]);
-/*
- // Check if the uid uses the (optional) second part
- if (uid_2nd) {
- // Configure the ATQA and SAK accordingly
- response1[0] |= 0x40;
- sak |= 0x04;
- }
-*/
-
-//static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; // uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
-
-
- // Prepare protocol messages
- // static const uint8_t cmd1[] = { 0x26 };
-// static const uint8_t response1[] = { 0x02, 0x00 }; // Says: I am Mifare 4k - original line - greg
-//
-// uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me
-// static const uint8_t response1[] = { 0x44, 0x00 }; // Says: I am a ULTRALITE Tag, 0wn me
-
- // UID response
- // static const uint8_t cmd2[] = { 0x93, 0x20 };
- //static const uint8_t response2[] = { 0x9a, 0xe5, 0xe4, 0x43, 0xd8 }; // original value - greg
-
-// my desfire
-// uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // known uid - note cascade (0x88), 2nd byte (0x04) = NXP/Phillips
-
-
-// When reader selects us during cascade1 it will send cmd3
-//uint8_t response3[] = { 0x04, 0x00, 0x00 }; // SAK Select (cascade1) successful response (ULTRALITE)
-//uint8_t response3[] = { 0x24, 0x00, 0x00 }; // SAK Select (cascade1) successful response (DESFire)
-//ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
-
-// send cascade2 2nd half of UID
-//static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; // uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
-// NOTE : THE CRC on the above may be wrong as I have obfuscated the actual UID
-
-// When reader selects us during cascade2 it will send cmd3a
-//uint8_t response3a[] = { 0x00, 0x00, 0x00 }; // SAK Select (cascade2) successful response (ULTRALITE)
-//uint8_t response3a[] = { 0x20, 0x00, 0x00 }; // SAK Select (cascade2) successful response (DESFire)
-//ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
-
- static const uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
-
- uint8_t *resp;
- int respLen;
+ uint8_t *resp;
+ int respLen;
// Longest possible response will be 16 bytes + 2 CRC = 18 bytes
// This will need
// 166 bytes, since every bit that needs to be send costs us a byte
//
- // Respond with card type
- uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
- int resp1Len;
+ // Respond with card type
+ uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+ int resp1Len;
- // Anticollision cascade1 - respond with uid
- uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166);
- int resp2Len;
+ // Anticollision cascade1 - respond with uid
+ uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166);
+ int resp2Len;
- // Anticollision cascade2 - respond with 2nd half of uid if asked
- // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88
- uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140);
- int resp2aLen;
+ // Anticollision cascade2 - respond with 2nd half of uid if asked
+ // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88
+ uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140);
+ int resp2aLen;
- // Acknowledge select - cascade 1
- uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2));
- int resp3Len;
+ // Acknowledge select - cascade 1
+ uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2));
+ int resp3Len;
- // Acknowledge select - cascade 2
- uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3));
- int resp3aLen;
+ // Acknowledge select - cascade 2
+ uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3));
+ int resp3aLen;
- // Response to a read request - not implemented atm
- uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
- int resp4Len;
+ // Response to a read request - not implemented atm
+ uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
+ int resp4Len;
- // Authenticate response - nonce
- uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
- int resp5Len;
+ // Authenticate response - nonce
+ uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
+ int resp5Len;
- uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-// uint8_t *receivedCmd = (uint8_t *)BigBuf;
- int len;
+ // Authenticate response - nonce
+ uint8_t *resp6 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*6));
+ int resp6Len;
- //int i;
- //int u;
- //uint8_t b;
+ uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+ int len;
// To control where we are in the protocol
int order = 0;
int respsize = 0;
uint8_t nack = 0x04;
- //int fdt_indicator;
-
memset(receivedCmd, 0x44, RECV_CMD_SIZE);
// Prepare the responses of the anticollision phase
// Answer to request
CodeIso14443aAsTag(response1, sizeof(response1));
- memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+ memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
// Send our UID (cascade 1)
CodeIso14443aAsTag(response2, sizeof(response2));
- memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
+ memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
// Answer to select (cascade1)
CodeIso14443aAsTag(response3, sizeof(response3));
- memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
+ memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
// Send the cascade 2 2nd part of the uid
CodeIso14443aAsTag(response2a, sizeof(response2a));
- memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax;
+ memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax;
// Answer to select (cascade 2)
CodeIso14443aAsTag(response3a, sizeof(response3a));
- memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
+ memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
// Strange answer is an example of rare message size (3 bits)
CodeStrangeAnswerAsTag();
// Authentication answer (random nonce)
CodeIso14443aAsTag(response5, sizeof(response5));
- memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax;
+ memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax;
- // We need to listen to the high-frequency, peak-detected path.
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
+ // dummy ATS (pseudo-ATR), answer to RATS
+ CodeIso14443aAsTag(response6, sizeof(response6));
+ memcpy(resp6, ToSend, ToSendMax); resp6Len = ToSendMax;
- cmdsRecvd = 0;
+ // We need to listen to the high-frequency, peak-detected path.
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ FpgaSetupSsc();
- LED_A_ON();
- for(;;) {
+ cmdsRecvd = 0;
+ LED_A_ON();
+ for(;;) {
+
if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) {
- DbpString("button press");
- break;
- }
- // 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;
- //i = 1; // first byte transmitted
- if(receivedCmd[0] == 0x26) {
- // Received a REQUEST
+ DbpString("button press");
+ break;
+ }
+ // 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;
+ if(receivedCmd[0] == 0x26) { // Received a REQUEST
resp = resp1; respLen = resp1Len; order = 1;
respdata = response1;
respsize = sizeof(response1);
- //DbpString("Hello request from reader:");
- } else if(receivedCmd[0] == 0x52) {
- // Received a WAKEUP
+ } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP
resp = resp1; respLen = resp1Len; order = 6;
-// //DbpString("Wakeup request from reader:");
respdata = response1;
respsize = sizeof(response1);
- } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // greg - cascade 1 anti-collision
- // Received request for UID (cascade 1)
+ } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1)
resp = resp2; respLen = resp2Len; order = 2;
-// DbpString("UID (cascade 1) request from reader:");
-// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
respdata = response2;
respsize = sizeof(response2);
- } else if(receivedCmd[1] == 0x20 && receivedCmd[0] ==0x95) { // greg - cascade 2 anti-collision
- // Received request for UID (cascade 2)
+ } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2)
resp = resp2a; respLen = resp2aLen; order = 20;
-// DbpString("UID (cascade 2) request from reader:");
-// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
respdata = response2a;
respsize = sizeof(response2a);
-
- } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x93) { // greg - cascade 1 select
- // Received a SELECT
+ } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1)
resp = resp3; respLen = resp3Len; order = 3;
-// DbpString("Select (cascade 1) request from reader:");
-// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
respdata = response3;
respsize = sizeof(response3);
-
- } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x95) { // greg - cascade 2 select
- // Received a SELECT
+ } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2)
resp = resp3a; respLen = resp3aLen; order = 30;
-// DbpString("Select (cascade 2) request from reader:");
-// DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
respdata = response3a;
respsize = sizeof(response3a);
-
- } else if(receivedCmd[0] == 0x30) {
- // Received a READ
+ } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
resp = resp4; respLen = resp4Len; order = 4; // Do nothing
- Dbprintf("Read request from reader: %x %x %x",
- receivedCmd[0], receivedCmd[1], receivedCmd[2]);
+ Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
respdata = &nack;
respsize = sizeof(nack); // 4-bit answer
-
- } else if(receivedCmd[0] == 0x50) {
- // Received a HALT
- resp = resp1; respLen = 0; order = 5; // Do nothing
+ } else if(receivedCmd[0] == 0x50) { // Received a HALT
DbpString("Reader requested we HALT!:");
+ // Do not respond
+ resp = resp1; respLen = 0; order = 0;
respdata = NULL;
respsize = 0;
-
- } else if(receivedCmd[0] == 0x60) {
- // Received an authentication request
+ } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request
resp = resp5; respLen = resp5Len; order = 7;
- Dbprintf("Authenticate request from reader: %x %x %x",
- receivedCmd[0], receivedCmd[1], receivedCmd[2]);
- respdata = NULL;
- respsize = 0;
-
- } else if(receivedCmd[0] == 0xE0) {
- // Received a RATS request
- resp = resp1; respLen = 0;order = 70;
- Dbprintf("RATS request from reader: %x %x %x",
- receivedCmd[0], receivedCmd[1], receivedCmd[2]);
- respdata = NULL;
- respsize = 0;
+ respdata = response5;
+ respsize = sizeof(response5);
+ } else if(receivedCmd[0] == 0xE0) { // Received a RATS request
+ resp = resp6; respLen = resp6Len; order = 70;
+ respdata = response6;
+ respsize = sizeof(response6);
} else {
// Never seen this command before
- Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
+ 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],
//i = 0;
}
-
if(cmdsRecvd > 999) {
DbpString("1000 commands later...");
- break;
- }
- else {
+ break;
+ } else {
cmdsRecvd++;
}
if(respLen > 0) {
- //----------------------------
- //u = 0;
- //b = 0x00;
- //fdt_indicator = FALSE;
EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
}
}
memset(receivedCmd, 0x44, RECV_CMD_SIZE);
-/* // Modulate Manchester
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
- AT91C_BASE_SSC->SSC_THR = 0x00;
- FpgaSetupSsc();
-
- // ### Transmit the response ###
- u = 0;
- b = 0x00;
- fdt_indicator = FALSE;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- (void)b;
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- if(i > respLen) {
- b = 0x00;
- u++;
- } else {
- b = resp[i];
- i++;
- }
- AT91C_BASE_SSC->SSC_THR = b;
-
- if(u > 4) {
- break;
- }
- }
- if(BUTTON_PRESS()) {
- break;
- }
- }
-*/
- }
+ }
Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
LED_A_OFF();
{
if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
- isNULL = (nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
+ 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;
if (nt_diff == 0)
cardSTATE = MFEMUL_WORK;
break;
}
-
}
-
}
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen);
}
+
+//-----------------------------------------------------------------------------
+// MIFARE sniffer.
+//
+//-----------------------------------------------------------------------------
+void RAMFUNC SniffMifare(void) {
+ 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
+
+ // 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);
+
+ // 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;
+ int lastRxCounter;
+ int8_t *upTo;
+ int smpl;
+ int maxBehindBy = 0;
+
+ // 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;
+
+ // 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
+ // 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);
+
+ // 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) {
+ 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;
+
+ 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;
+ }
+
+ rsamples += 4;
+ if(MillerDecoding((smpl & 0xF0) >> 4)) {
+ LED_C_ON();
+ if(triggered) {
+ if (!LogTrace(receivedCmd, Uart.byteCnt, -1 * 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(smpl & 0x0F)) {
+ LED_B_ON();
+
+ if (!LogTrace(receivedResponse, Demod.len, -1 * Demod.samples, Demod.parityBits, FALSE)) break;
+
+ triggered = TRUE;
+
+ // And ready to receive another response.
+ memset(&Demod, 0, sizeof(Demod));
+ Demod.output = receivedResponse;
+ Demod.state = DEMOD_UNSYNCD;
+ LED_C_OFF();
+ }
+
+ if(BUTTON_PRESS()) {
+ DbpString("button cancelled");
+ goto done;
+ }
+ } // 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]);
+ LEDsoff();
+}
\ No newline at end of file
projects / proxmark3-svn / blobdiff