#include "BigBuf.h"
#include "protocols.h"
#include "parity.h"
+#include "fpgaloader.h"
typedef struct {
enum {
void iso14a_set_timeout(uint32_t timeout) {
- iso14a_timeout = timeout - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) + 2;
+ // adjust timeout by FPGA delays and 2 additional ssp_frames to detect SOF
+ iso14a_timeout = timeout + (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) + 2;
if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", timeout, timeout / 106);
}
uint32_t iso14a_get_timeout(void) {
- return iso14a_timeout + (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) - 2;
+ return iso14a_timeout - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) - 2;
}
//-----------------------------------------------------------------------------
Uart.startTime -= Uart.syncBit;
Uart.endTime = Uart.startTime;
Uart.state = STATE_START_OF_COMMUNICATION;
+ LED_B_ON();
}
} else {
if (IsMillerModulationNibble1(Uart.fourBits >> Uart.syncBit)) {
if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) { // Modulation in both halves - error
+ LED_B_OFF();
UartReset();
} else { // Modulation in first half = Sequence Z = logic "0"
if (Uart.state == STATE_MILLER_X) { // error - must not follow after X
+ LED_B_OFF();
UartReset();
} else {
Uart.bitCount++;
}
} else { // no modulation in both halves - Sequence Y
if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication
+ LED_B_OFF();
Uart.state = STATE_UNSYNCD;
Uart.bitCount--; // last "0" was part of EOC sequence
Uart.shiftReg <<= 1; // drop it
}
}
if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC
+ LED_B_OFF();
UartReset();
} else { // a logic "0"
Uart.bitCount++;
Demod.startTime -= Demod.syncBit;
Demod.bitCount = offset; // number of decoded data bits
Demod.state = DEMOD_MANCHESTER_DATA;
+ LED_C_ON();
}
}
}
Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1);
} else { // no modulation in both halves - End of communication
+ LED_C_OFF();
if(Demod.bitCount > 0) { // there are some remaining data bits
Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits
Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output
// bit 1 - trigger from first reader 7-bit request
LEDsoff();
+ LED_A_ON();
iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
break;
}
- LED_A_ON();
WDT_HIT();
int register readBufDataP = data - dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
}
- LED_A_OFF();
-
if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder
if(!TagIsActive) { // no need to try decoding reader data if the tag is sending
uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4);
if (MillerDecoding(readerdata, (rsamples-1)*4)) {
- LED_C_ON();
-
// check - if there is a short 7bit request from reader
- if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = true;
-
+ if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) {
+ triggered = true;
+ }
if(triggered) {
if (!LogTrace(receivedCmd,
Uart.len,
/* And also reset the demod code, which might have been */
/* false-triggered by the commands from the reader. */
DemodReset();
- LED_B_OFF();
}
ReaderIsActive = (Uart.state != STATE_UNSYNCD);
}
- if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time
+ if (!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time
uint8_t tagdata = (previous_data << 4) | (*data & 0x0F);
- if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) {
- LED_B_ON();
-
+ if (ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) {
if (!LogTrace(receivedResponse,
Demod.len,
Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
Demod.parity,
false)) break;
-
if ((!triggered) && (param & 0x01)) triggered = true;
-
// And ready to receive another response.
DemodReset();
// And reset the Miller decoder including itS (now outdated) input buffer
UartInit(receivedCmd, receivedCmdPar);
-
- LED_C_OFF();
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
}
}
} // main cycle
- DbpString("COMMAND FINISHED");
-
FpgaDisableSscDma();
+ LEDsoff();
+
+ DbpString("COMMAND FINISHED");
Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
- LEDsoff();
}
//-----------------------------------------------------------------------------
EmSendPrecompiledCmd(p_response);
}
- if (!tracing) {
+ if (!get_tracing()) {
Dbprintf("Trace Full. Simulation stopped.");
break;
}
//-------------------------------------------------------------------------------------
static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing)
{
-
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
uint32_t ThisTransferTime = 0;
ADC_MODE_PRESCALE(63) |
ADC_MODE_STARTUP_TIME(1) |
ADC_MODE_SAMPLE_HOLD_TIME(15);
- AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
+ AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF_LOW);
// start ADC
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
if (BUTTON_PRESS()) return 1;
// test if the field exists
- if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) {
+ if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF_LOW)) {
analogCnt++;
- analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
+ analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF_LOW];
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
if (analogCnt >= 32) {
- if ((MAX_ADC_HF_VOLTAGE * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
+ if ((MAX_ADC_HF_VOLTAGE_LOW * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
vtime = GetTickCount();
if (!timer) timer = vtime;
// 50ms no field --> card to idle state
bool correctionNeeded;
// Modulate Manchester
+ LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
// include correction bit if necessary
LED_A_ON();
// Log reader command in trace buffer
- if (tracing) {
- LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, true);
- }
+ LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, true);
}
static int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
{
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return false;
- if (tracing) {
- LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false);
- }
+ LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false);
return Demod.len;
}
int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
{
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return false;
- if (tracing) {
- LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false);
- }
+ LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false);
return Demod.len;
}
if (anticollision) {
// SELECT_ALL
ReaderTransmit(sel_all, sizeof(sel_all), NULL);
- if (!ReaderReceive(resp, resp_par)) return 0;
+ if (!ReaderReceive(resp, resp_par)) {
+ return 0;
+ }
if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit
memset(uid_resp, 0, 4);
}
collision_answer_offset = uid_resp_bits%8;
ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL);
- if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0;
+ if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) {
+ return 0;
+ }
}
// finally, add the last bits and BCC of the UID
for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) {
ReaderTransmit(sel_uid, sizeof(sel_uid), NULL);
// Receive the SAK
- if (!ReaderReceive(resp, resp_par)) return 0;
+ if (!ReaderReceive(resp, resp_par)) {
+ return 0;
+ }
sak = resp[0];
// Test if more parts of the uid are coming
AppendCrc14443a(rats, 2);
ReaderTransmit(rats, sizeof(rats), NULL);
- if (!(len = ReaderReceive(resp, resp_par))) return 0;
+ if (!(len = ReaderReceive(resp, resp_par))) {
+ return 0;
+ }
if(p_hi14a_card) {
memcpy(p_hi14a_card->ats, resp, len);
void iso14443a_setup(uint8_t fpga_minor_mode) {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Set up the synchronous serial port
- FpgaSetupSsc();
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
b5,b6 = 00 - DESELECT
11 - WTX
*/
-int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
+int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, bool send_chaining, void *data, uint8_t *res) {
uint8_t parity[MAX_PARITY_SIZE];
uint8_t real_cmd[cmd_len + 4];
- // ISO 14443 APDU frame: PCB [CID] [NAD] APDU CRC PCB=0x02
- real_cmd[0] = 0x02; // bnr,nad,cid,chn=0; i-block(0x00)
- // put block number into the PCB
- real_cmd[0] |= iso14_pcb_blocknum;
- memcpy(real_cmd + 1, cmd, cmd_len);
+ if (cmd_len) {
+ // ISO 14443 APDU frame: PCB [CID] [NAD] APDU CRC PCB=0x02
+ real_cmd[0] = 0x02; // bnr,nad,cid,chn=0; i-block(0x00)
+ if (send_chaining) {
+ real_cmd[0] |= 0x10;
+ }
+ // put block number into the PCB
+ real_cmd[0] |= iso14_pcb_blocknum;
+ memcpy(real_cmd + 1, cmd, cmd_len);
+ } else {
+ // R-block. ACK
+ real_cmd[0] = 0xA2; // r-block + ACK
+ real_cmd[0] |= iso14_pcb_blocknum;
+ }
AppendCrc14443a(real_cmd, cmd_len + 1);
ReaderTransmit(real_cmd, cmd_len + 3, NULL);
return 0; //DATA LINK ERROR
} else{
// S-Block WTX
- while((data_bytes[0] & 0xF2) == 0xF2) {
+ while(len && ((data_bytes[0] & 0xF2) == 0xF2)) {
uint32_t save_iso14a_timeout = iso14a_get_timeout();
// temporarily increase timeout
iso14a_set_timeout(MAX((data_bytes[1] & 0x3f) * save_iso14a_timeout, MAX_ISO14A_TIMEOUT));
{
iso14_pcb_blocknum ^= 1;
}
+
+ // if we received I-block with chaining we need to send ACK and receive another block of data
+ if (res)
+ *res = data_bytes[0];
// crc check
- if (len >=3 && !CheckCrc14443(CRC_14443_A, data_bytes, len)) {
+ if (len >= 3 && !CheckCrc14443(CRC_14443_A, data_bytes, len)) {
return -1;
}
}
- // cut frame byte
- len -= 1;
- // memmove(data_bytes, data_bytes + 1, len);
- for (int i = 0; i < len; i++)
- data_bytes[i] = data_bytes[i + 1];
-
+ if (len) {
+ // cut frame byte
+ len -= 1;
+ // memmove(data_bytes, data_bytes + 1, len);
+ for (int i = 0; i < len; i++)
+ data_bytes[i] = data_bytes[i + 1];
+ }
+
return len;
}
// 1 - all is OK with ATS, 2 - without ATS
cantSELECT = true;
}
-
+ FpgaDisableTracing();
LED_B_ON();
cmd_send(CMD_ACK,arg0,card->uidlen,0,buf,sizeof(iso14a_card_select_t));
LED_B_OFF();
}
if(param & ISO14A_APDU && !cantSELECT) {
- arg0 = iso14_apdu(cmd, len, buf);
+ uint8_t res;
+ arg0 = iso14_apdu(cmd, len, (param & ISO14A_SEND_CHAINING), buf, &res);
+ FpgaDisableTracing();
LED_B_ON();
- cmd_send(CMD_ACK, arg0, 0, 0, buf, sizeof(buf));
+ cmd_send(CMD_ACK, arg0, res, 0, buf, sizeof(buf));
LED_B_OFF();
}
}
}
arg0 = ReaderReceive(buf, par);
+ FpgaDisableTracing();
LED_B_ON();
cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
- if (first_try) {
- iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
- }
+ iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
// free eventually allocated BigBuf memory. We want all for tracing.
BigBuf_free();
clear_trace();
set_tracing(true);
- byte_t nt_diff = 0;
+ uint8_t nt_diff = 0;
uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
- static byte_t par_low = 0;
+ static uint8_t par_low = 0;
bool led_on = true;
uint8_t uid[10] ={0};
uint32_t cuid;
uint32_t nt = 0;
uint32_t previous_nt = 0;
static uint32_t nt_attacked = 0;
- byte_t par_list[8] = {0x00};
- byte_t ks_list[8] = {0x00};
+ uint8_t par_list[8] = {0x00};
+ uint8_t ks_list[8] = {0x00};
#define PRNG_SEQUENCE_LENGTH (1 << 16);
- static uint32_t sync_time;
+ uint32_t sync_time = GetCountSspClk() & 0xfffffff8;
static int32_t sync_cycles;
int catch_up_cycles = 0;
int last_catch_up = 0;
if (first_try) {
mf_nr_ar3 = 0;
- sync_time = GetCountSspClk() & 0xfffffff8;
+ par[0] = par_low = 0;
sync_cycles = PRNG_SEQUENCE_LENGTH; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the tag nonces).
nt_attacked = 0;
- par[0] = 0;
}
else {
// we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same)
#define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up.
#define MAX_SYNC_TRIES 32
+ #define SYNC_TIME_BUFFER 16 // if there is only SYNC_TIME_BUFFER left before next planned sync, wait for next PRNG cycle
#define NUM_DEBUG_INFOS 8 // per strategy
#define MAX_STRATEGY 3
uint16_t unexpected_random = 0;
sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
catch_up_cycles = 0;
- // if we missed the sync time already, advance to the next nonce repeat
- while(GetCountSspClk() > sync_time) {
+ // if we missed the sync time already or are about to miss it, advance to the next nonce repeat
+ while(sync_time < GetCountSspClk() + SYNC_TIME_BUFFER) {
elapsed_prng_sequences++;
sync_time = (sync_time & 0xfffffff8) + sync_cycles;
}
}
}
- byte_t buf[28];
+ FpgaDisableTracing();
+
+ uint8_t buf[32];
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);
+ memcpy(buf + 24, mf_nr_ar, 8);
- cmd_send(CMD_ACK, isOK, 0, 0, buf, 28);
+ cmd_send(CMD_ACK, isOK, 0, 0, buf, 32);
// Thats it...
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
// C(red) A(yellow) B(green)
LEDsoff();
+ LED_A_ON();
+
// init trace buffer
clear_trace();
set_tracing(true);
// Setup for the DMA.
FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer.
- LED_D_OFF();
-
// init sniffer
MfSniffInit();
for(uint32_t sniffCounter = 0; true; ) {
if(BUTTON_PRESS()) {
- DbpString("cancelled by button");
+ DbpString("Canceled by button.");
break;
}
- LED_A_ON();
WDT_HIT();
if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time
AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
}
- LED_A_OFF();
-
if (sniffCounter & 0x01) {
if(!TagIsActive) { // no need to try decoding tag data if the reader is sending
uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4);
if(MillerDecoding(readerdata, (sniffCounter-1)*4)) {
- LED_C_INV();
+
if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, true)) break;
/* And ready to receive another command. */
if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending
uint8_t tagdata = (previous_data << 4) | (*data & 0x0F);
if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) {
- LED_C_INV();
if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, false)) break;
} // main cycle
- DbpString("COMMAND FINISHED");
-
+ FpgaDisableTracing();
FpgaDisableSscDma();
+ LEDsoff();
+
+ DbpString("COMMAND FINISHED.");
+
MfSniffEnd();
Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
- LEDsoff();
}
projects / proxmark3-svn / blobdiff