X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d2736c4e2019a54de8a8a483847fb637be889d10..27882d378be348c9bf68b741f993de0ea2001ab8:/armsrc/hitag2.c diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c index 508157de..dd0211da 100644 --- a/armsrc/hitag2.c +++ b/armsrc/hitag2.c @@ -340,7 +340,7 @@ static void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* // Unknown command default: - Dbprintf("Uknown command: %02x %02x",rx[0],rx[1]); + Dbprintf("Unknown command: %02x %02x",rx[0],rx[1]); return; break; } @@ -697,6 +697,42 @@ static bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx 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; @@ -957,7 +993,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { // Set up simulator mode, frequency divisor which will drive the FPGA // and analog mux selection. - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); RELAY_OFF(); @@ -1123,19 +1159,18 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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); @@ -1145,10 +1180,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bAuthenticating = false; bQuitTraceFull = true; } break; - case RHT2F_CRYPTO: { DbpString("Authenticating using key:"); - memcpy(key,htd->crypto.key,4); //HACK; 4 or 6?? I read both in the code. + memcpy(key,htd->crypto.key,6); //HACK; 4 or 6?? I read both in the code. Dbhexdump(6,key,false); blocknr = 0; bQuiet = false; @@ -1156,7 +1190,6 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bAuthenticating = false; bQuitTraceFull = true; } break; - case RHT2F_TEST_AUTH_ATTEMPTS: { Dbprintf("Testing %d authentication attempts",(auth_table_len/8)); auth_table_pos = 0; @@ -1165,7 +1198,13 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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; @@ -1222,22 +1261,22 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { // 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(); @@ -1272,6 +1311,11 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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; @@ -1288,6 +1332,8 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { // 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); @@ -1317,7 +1363,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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 @@ -1333,19 +1381,29 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { // 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 @@ -1357,6 +1415,11 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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--; @@ -1366,22 +1429,27 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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"); - cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); + //Dbprintf("frame received: %d",frame_count); + //DbpString("All done"); + cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); }