#include "proxmark3.h"
#include "apps.h"
+#include "usb_cdc.h"
#include "util.h"
#include "string.h"
#include "iso14443crc.h"
Demod.state = DEMOD_UNSYNCD;
} else {
LED_C_ON(); // Got SOF
- Demod.state = DEMOD_AWAITING_START_BIT;
Demod.posCount = 0;
+ Demod.bitCount = 0;
Demod.len = 0;
+ Demod.state = DEMOD_AWAITING_START_BIT;
/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
Demod.metricN = 0;
Demod.metric = 0;
case DEMOD_AWAITING_START_BIT:
Demod.posCount++;
MAKE_SOFT_DECISION();
- 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;
+ 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
LED_C_OFF();
+ if (Demod.bitCount == 0 && Demod.len == 0) { // received SOF only, this is valid for iClass/Picopass
+ return true;
+ } else {
+ Demod.state = DEMOD_UNSYNCD;
+ }
}
} else { // start bit detected
- Demod.bitCount = 0;
Demod.posCount = 1; // this was the first half
Demod.thisBit = v;
Demod.shiftReg = 0;
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
*/
Demod.shiftReg >>= 1;
- if(Demod.thisBit > 0) { // logic '1'
+ if (Demod.thisBit > 0) { // logic '1'
Demod.shiftReg |= 0x200;
}
Demod.bitCount++;
- if(Demod.bitCount == 10) {
+ if (Demod.bitCount == 10) {
uint16_t s = Demod.shiftReg;
- if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0'
+ if ((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0'
uint8_t b = (s >> 1);
Demod.output[Demod.len] = b;
Demod.len++;
+ Demod.bitCount = 0;
Demod.state = DEMOD_AWAITING_START_BIT;
} else {
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
- if(s == 0x000) {
+ if (s == 0x000) {
// This is EOF (start, stop and all data bits == '0'
return true;
}
* Demodulate the samples we received from the tag, also log to tracebuffer
* quiet: set to 'true' to disable debug output
*/
-static void GetSamplesFor14443bDemod(int timeout, bool quiet)
-{
+static int GetSamplesFor14443bDemod(int timeout, bool quiet) {
+ int ret = 0;
int maxBehindBy = 0;
bool gotFrame = false;
int lastRxCounter, samples = 0;
}
samples++;
- if(Handle14443bSamplesDemod(ci, cq)) {
+ if (Handle14443bSamplesDemod(ci, cq)) {
+ ret = Demod.len;
gotFrame = true;
break;
}
if(samples > timeout && Demod.state < DEMOD_PHASE_REF_TRAINING) {
+ ret = -1;
LED_C_OFF();
break;
}
FpgaDisableSscDma();
if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", maxBehindBy, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ);
- //Tracing
- if (Demod.len > 0) {
- LogTrace(Demod.output, Demod.len, 0, 0, NULL, false);
+
+ if (ret < 0) {
+ return ret;
}
+ //Tracing
+ LogTrace(Demod.output, Demod.len, 0, 0, NULL, false);
+
+ return ret;
}
/* 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)
-{
+int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) {
LED_A_ON();
uint8_t message_frame[message_length + 4];
// PCB
// send
CodeAndTransmit14443bAsReader(message_frame, message_length + 4);
// get response
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
FpgaDisableTracing();
- if(Demod.len < 3)
- {
+ if (ret < 3) {
LED_A_OFF();
return 0;
}
// TODO: Check CRC
// copy response contents
- if(response != NULL)
- {
+ if (response != NULL) {
memcpy(response, Demod.output, Demod.len);
}
LED_A_OFF();
- return Demod.len;
+ return ret;
}
/* Perform the ISO 14443 B Card Selection procedure
// first, wake up the tag
CodeAndTransmit14443bAsReader(wupb, sizeof(wupb));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
// ATQB too short?
- if (Demod.len < 14)
- {
+ if (ret < 14) {
return 2;
}
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);
+ ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
// Answer to ATTRIB too short?
- if(Demod.len < 3)
- {
+ if (ret < 3) {
return 2;
}
// reset PCB block number
// First command: wake up the tag using the INITIATE command
uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b};
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
- if (Demod.len == 0) {
+ if (ret < 0) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
DbpString("No response from tag");
LEDsoff();
cmd1[1] = Demod.output[0];
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
if (Demod.len != 3) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
cmd1[0] = 0x0B;
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) {
+ ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ if (ret != 10) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
LEDsoff();
cmd1[1] = i;
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
+ ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ if (ret != 6) { // Check if we got an answer from the tag
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
DbpString("Expected 6 bytes from tag, got less...");
LEDsoff();
}
// The check the CRC of the answer (use cmd1 as temporary variable):
ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]);
- if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) {
+ if (cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) {
Dbprintf("CRC Error reading block! Expected: %04x got: %04x",
(cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]);
// Do not return;, let's go on... (we should retry, maybe ?)
ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF);
}
- if(!ReaderIsActive && triggered) { // no need to try decoding tag data if the reader is sending or not yet triggered
- if(Handle14443bSamplesDemod(ci/2, cq/2)) {
+ if (!ReaderIsActive && triggered) { // no need to try decoding tag data if the reader is sending or not yet triggered
+ if (Handle14443bSamplesDemod(ci/2, cq/2) >= 0) {
//Use samples as a time measurement
LogTrace(Demod.output, Demod.len, samples, samples, NULL, false);
// And ready to receive another response.
CodeAndTransmit14443bAsReader(data, datalen);
- if(recv) {
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true);
+ if (recv) {
+ int ret = GetSamplesFor14443bDemod(5*RECEIVE_SAMPLES_TIMEOUT, true);
FpgaDisableTracing();
uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
- cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+ cmd_send(CMD_ACK, ret, 0, 0, Demod.output, iLen);
}
FpgaDisableTracing();
}
- if(!powerfield) {
+ if (!powerfield) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
}
projects / proxmark3-svn / blobdiff