return true;
}
+static bool hitag2_read_uid(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+ // Reset the transmission frame length
+ *txlen = 0;
+
+ // Try to find out which command was send by selecting on length (in bits)
+ switch (rxlen) {
+ // No answer, try to resurrect
+ case 0: {
+ // Just starting or if there is no answer
+ *txlen = 5;
+ memcpy(tx,"\xc0",nbytes(*txlen));
+ } break;
+ // Received UID
+ case 32: {
+ // Check if we received answer tag (at)
+ if (bAuthenticating) {
+ bAuthenticating = false;
+ } else {
+ // Store the received block
+ memcpy(tag.sectors[blocknr],rx,4);
+ blocknr++;
+ }
+ if (blocknr > 0) {
+ //DbpString("Read successful!");
+ bSuccessful = true;
+ return false;
+ }
+ } break;
+ // Unexpected response
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
+ }
+ return true;
+}
void SnoopHitag(uint32_t type) {
int frame_count;
set_tracing(TRUE);
clear_trace();
- DbpString("Starting Hitag reader family");
+ //DbpString("Starting Hitag reader family");
// Check configuration
switch(htf) {
case RHT2F_PASSWORD: {
Dbprintf("List identifier in password mode");
memcpy(password,htd->pwd.password,4);
- blocknr = 0;
+ blocknr = 0;
bQuitTraceFull = false;
bQuiet = false;
bPwd = false;
} break;
-
case RHT2F_AUTHENTICATE: {
DbpString("Authenticating using nr,ar pair:");
memcpy(NrAr,htd->auth.NrAr,8);
bAuthenticating = false;
bQuitTraceFull = true;
} break;
-
case RHT2F_CRYPTO: {
DbpString("Authenticating using key:");
memcpy(key,htd->crypto.key,6); //HACK; 4 or 6?? I read both in the code.
bAuthenticating = false;
bQuitTraceFull = true;
} break;
-
case RHT2F_TEST_AUTH_ATTEMPTS: {
Dbprintf("Testing %d authentication attempts",(auth_table_len/8));
auth_table_pos = 0;
bQuiet = false;
bCrypto = false;
} break;
-
+ case RHT2F_UID_ONLY: {
+ blocknr = 0;
+ bQuiet = false;
+ bCrypto = false;
+ bAuthenticating = false;
+ bQuitTraceFull = true;
+ } break;
default: {
Dbprintf("Error, unknown function: %d",htf);
return;
// hitagS settings
reset_sof = 1;
t_wait = 200;
- DbpString("Configured for hitagS reader");
+ //DbpString("Configured for hitagS reader");
} else if (htf < 20) {
// hitag1 settings
reset_sof = 1;
t_wait = 200;
- DbpString("Configured for hitag1 reader");
+ //DbpString("Configured for hitag1 reader");
} else if (htf < 30) {
// hitag2 settings
reset_sof = 4;
t_wait = HITAG_T_WAIT_2;
- DbpString("Configured for hitag2 reader");
+ //DbpString("Configured for hitag2 reader");
} else {
Dbprintf("Error, unknown hitag reader type: %d",htf);
return;
}
-
+ uint8_t attempt_count=0;
while(!bStop && !BUTTON_PRESS()) {
// Watchdog hit
WDT_HIT();
case RHT2F_TEST_AUTH_ATTEMPTS: {
bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen);
} break;
+ case RHT2F_UID_ONLY: {
+ bStop = !hitag2_read_uid(rx, rxlen, tx, &txlen);
+ attempt_count++; //attempt 3 times to get uid then quit
+ if (!bStop && attempt_count == 3) bStop = true;
+ } break;
default: {
Dbprintf("Error, unknown function: %d",htf);
return;
// we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'.
// All timer values are in terms of T0 units
while(AT91C_BASE_TC0->TC_CV < T0*(t_wait+(HITAG_T_TAG_HALF_PERIOD*lastbit)));
+
+ //Dbprintf("DEBUG: Sending reader frame");
// Transmit the reader frame
hitag_reader_send_frame(tx,txlen);
bSkip = true;
tag_sof = reset_sof;
response = 0;
-
+ //Dbprintf("DEBUG: Waiting to receive frame");
+ uint32_t errorCount = 0;
+
// Receive frame, watch for at most T0*EOF periods
while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) {
// Check if falling edge in tag modulation is detected
// Capture tag frame (manchester decoding using only falling edges)
if(ra >= HITAG_T_EOF) {
if (rxlen != 0) {
- //DbpString("wierd1?");
+ //Dbprintf("DEBUG: Wierd1");
}
// Capture the T0 periods that have passed since last communication or field drop (reset)
// We always recieve a 'one' first, which has the falling edge after a half period |-_|
response = ra-HITAG_T_TAG_HALF_PERIOD;
} else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) {
// Manchester coding example |-_|_-|-_| (101)
+
+ //need to test to verify we don't exceed memory...
+ //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+ // break;
+ //}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
rx[rxlen / 8] |= 1 << (7-(rxlen%8));
rxlen++;
} else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) {
// Manchester coding example |_-|...|_-|-_| (0...01)
+
+ //need to test to verify we don't exceed memory...
+ //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+ // break;
+ //}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
// We have to skip this half period at start and add the 'one' the second time
bSkip = !bSkip;
} else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) {
// Manchester coding example |_-|_-| (00) or |-_|-_| (11)
+
+ //need to test to verify we don't exceed memory...
+ //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+ // break;
+ //}
if (tag_sof) {
// Ignore bits that are transmitted during SOF
tag_sof--;
rxlen++;
}
} else {
+ //Dbprintf("DEBUG: Wierd2");
+ errorCount++;
// Ignore wierd value, is to small to mean anything
}
}
-
+ //if we saw over 100 wierd values break it probably isn't hitag...
+ if (errorCount >100) break;
// We can break this loop if we received the last bit from a frame
if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) {
if (rxlen>0) break;
}
}
}
+ //Dbprintf("DEBUG: Done waiting for frame");
+
LED_B_OFF();
LED_D_OFF();
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- Dbprintf("frame received: %d",frame_count);
- DbpString("All done");
+ //Dbprintf("frame received: %d",frame_count);
+ //DbpString("All done");
cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48);
}
projects / proxmark3-svn / blobdiff