X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d19929cbe8d681b60496ca6d9d9cbd806822e163..991f13f27db8ba53fea29f0df8a9ae606fc5a491:/armsrc/hitag2.c diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c index 75513232..9181a62e 100644 --- a/armsrc/hitag2.c +++ b/armsrc/hitag2.c @@ -25,7 +25,33 @@ static bool bQuiet; bool bCrypto; +bool bAuthenticating; bool bPwd; +bool bSuccessful; + +int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int bReader) +{ + // Return when trace is full + if (traceLen >= TRACE_SIZE) return FALSE; + + // Trace the random, i'm curious + rsamples += iSamples; + trace[traceLen++] = ((rsamples >> 0) & 0xff); + trace[traceLen++] = ((rsamples >> 8) & 0xff); + trace[traceLen++] = ((rsamples >> 16) & 0xff); + trace[traceLen++] = ((rsamples >> 24) & 0xff); + if (!bReader) { + trace[traceLen - 1] |= 0x80; + } + trace[traceLen++] = ((dwParity >> 0) & 0xff); + trace[traceLen++] = ((dwParity >> 8) & 0xff); + trace[traceLen++] = ((dwParity >> 16) & 0xff); + trace[traceLen++] = ((dwParity >> 24) & 0xff); + trace[traceLen++] = iBits; + memcpy(trace + traceLen, btBytes, nbytes(iBits)); + traceLen += nbytes(iBits); + return TRUE; +} struct hitag2_tag { uint32_t uid; @@ -41,8 +67,7 @@ struct hitag2_tag { byte_t sectors[12][4]; }; -static struct hitag2_tag tag; -static const struct hitag2_tag resetdata = { +static struct hitag2_tag tag = { .state = TAG_STATE_RESET, .sectors = { // Password mode: | Crypto mode: [0] = { 0x02, 0x4e, 0x02, 0x20}, // UID | UID @@ -73,6 +98,8 @@ size_t auth_table_len = AUTH_TABLE_LENGTH; byte_t password[4]; byte_t NrAr[8]; +byte_t key[8]; +uint64_t cipher_state; /* Following is a modified version of cryptolib.com/ciphers/hitag2/ */ // Software optimized 48-bit Philips/NXP Mifare Hitag2 PCF7936/46/47/52 stream cipher algorithm by I.C. Wiener 2006-2007. @@ -150,10 +177,6 @@ static u32 _hitag2_byte (u64 * x) return c; } -size_t nbytes(size_t nbits) { - return (nbits/8)+((nbits%8)>0); -} - int hitag2_reset(void) { tag.state = TAG_STATE_RESET; @@ -163,23 +186,23 @@ int hitag2_reset(void) int hitag2_init(void) { - memcpy(&tag, &resetdata, sizeof(tag)); +// memcpy(&tag, &resetdata, sizeof(tag)); hitag2_reset(); return 0; } static void hitag2_cipher_reset(struct hitag2_tag *tag, const byte_t *iv) { - uint64_t key = ((uint64_t)tag->sectors[2][2]) | - ((uint64_t)tag->sectors[2][3] << 8) | - ((uint64_t)tag->sectors[1][0] << 16) | - ((uint64_t)tag->sectors[1][1] << 24) | - ((uint64_t)tag->sectors[1][2] << 32) | - ((uint64_t)tag->sectors[1][3] << 40); - uint32_t uid = ((uint32_t)tag->sectors[0][0]) | - ((uint32_t)tag->sectors[0][1] << 8) | - ((uint32_t)tag->sectors[0][2] << 16) | - ((uint32_t)tag->sectors[0][3] << 24); + uint64_t key = ((uint64_t)tag->sectors[2][2]) | + ((uint64_t)tag->sectors[2][3] << 8) | + ((uint64_t)tag->sectors[1][0] << 16) | + ((uint64_t)tag->sectors[1][1] << 24) | + ((uint64_t)tag->sectors[1][2] << 32) | + ((uint64_t)tag->sectors[1][3] << 40); + uint32_t uid = ((uint32_t)tag->sectors[0][0]) | + ((uint32_t)tag->sectors[0][1] << 8) | + ((uint32_t)tag->sectors[0][2] << 16) | + ((uint32_t)tag->sectors[0][3] << 24); uint32_t iv_ = (((uint32_t)(iv[0]))) | (((uint32_t)(iv[1])) << 8) | (((uint32_t)(iv[2])) << 16) | @@ -396,8 +419,8 @@ void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, si break; } -// LogTrace(rx,nbytes(rxlen),0,0,false); -// LogTrace(tx,nbytes(*txlen),0,0,true); +// LogTraceHitag(rx,rxlen,0,0,false); +// LogTraceHitag(tx,*txlen,0,0,true); if(tag.crypto_active) { hitag2_cipher_transcrypt(&(tag.cs), tx, *txlen/8, *txlen%8); @@ -450,6 +473,8 @@ static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len) LOW(GPIO_SSC_DOUT); } +size_t blocknr; + bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { // Reset the transmission frame length *txlen = 0; @@ -473,22 +498,131 @@ bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) *txlen = 32; memcpy(tx,password,4); bPwd = true; + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; } else { - DbpString("Password succesful!"); - // We are done... for now - return false; + + if(blocknr == 1){ + //store password in block1, the TAG answers with Block3, but we need the password in memory + memcpy(tag.sectors[blocknr],tx,4); + }else{ + memcpy(tag.sectors[blocknr],rx,4); + } + + blocknr++; + if (blocknr > 7) { + DbpString("Read succesful!"); + bSuccessful = true; + return false; + } + *txlen = 10; + tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); } } break; // Unexpected response - default: { + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; + } + return true; +} + +bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { + // Reset the transmission frame length + *txlen = 0; + + if(bCrypto) { + hitag2_cipher_transcrypt(&cipher_state,rx,rxlen/8,rxlen%8); + } + + // Try to find out which command was send by selecting on length (in bits) + switch (rxlen) { + // No answer, try to resurrect + case 0: { + // Stop if there is no answer while we are in crypto mode (after sending NrAr) + if (bCrypto) { + // Failed during authentication + if (bAuthenticating) { + DbpString("Authentication failed!"); + return false; + } else { + // Failed reading a block, could be (read/write) locked, skip block and re-authenticate + if (blocknr == 1) { + // Write the low part of the key in memory + memcpy(tag.sectors[1],key+2,4); + } else if (blocknr == 2) { + // Write the high part of the key in memory + tag.sectors[2][0] = 0x00; + tag.sectors[2][1] = 0x00; + tag.sectors[2][2] = key[0]; + tag.sectors[2][3] = key[1]; + } else { + // Just put zero's in the memory (of the unreadable block) + memset(tag.sectors[blocknr],0x00,4); + } + blocknr++; + bCrypto = false; + } + } else { + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } + } break; + + // Received UID, crypto tag answer + case 32: { + if (!bCrypto) { + uint64_t ui64key = key[0] | ((uint64_t)key[1]) << 8 | ((uint64_t)key[2]) << 16 | ((uint64_t)key[3]) << 24 | ((uint64_t)key[4]) << 32 | ((uint64_t)key[5]) << 40; + uint32_t ui32uid = rx[0] | ((uint32_t)rx[1]) << 8 | ((uint32_t)rx[2]) << 16 | ((uint32_t)rx[3]) << 24; + cipher_state = _hitag2_init(rev64(ui64key), rev32(ui32uid), 0); + memset(tx,0x00,4); + memset(tx+4,0xff,4); + hitag2_cipher_transcrypt(&cipher_state,tx+4,4,0); + *txlen = 64; + bCrypto = true; + bAuthenticating = true; + } else { + // 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 > 7) { + DbpString("Read succesful!"); + bSuccessful = true; + return false; + } + *txlen = 10; + tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); + } + } break; + + // Unexpected response + default: { Dbprintf("Uknown frame length: %d",rxlen); return false; } break; } + + + if(bCrypto) { + // We have to return now to avoid double encryption + if (!bAuthenticating) { + hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8); + } + } + return true; } + bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { // Reset the transmission frame length *txlen = 0; @@ -539,12 +673,19 @@ bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_ case 0: { // Stop if there is no answer while we are in crypto mode (after sending NrAr) if (bCrypto) { - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); + Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed, removed entry!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); + + // Removing failed entry from authentiations table + memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8); + auth_table_len -= 8; + + // Return if we reached the end of the authentiactions table bCrypto = false; - if ((auth_table_pos+8) == auth_table_len) { + if (auth_table_pos == auth_table_len) { return false; } - auth_table_pos += 8; + + // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry) memcpy(NrAr,auth_table+auth_table_pos,8); } *txlen = 5; @@ -590,8 +731,8 @@ void SnoopHitag(uint32_t type) { size_t rxlen=0; // Clean up trace and prepare it for storing frames - iso14a_set_tracing(TRUE); - iso14a_clear_trace(); + iso14a_set_tracing(TRUE); + iso14a_clear_trace(); auth_table_len = 0; auth_table_pos = 0; @@ -602,6 +743,7 @@ void SnoopHitag(uint32_t type) { // Set up eavesdropping mode, frequency divisor which will drive the FPGA // and analog mux selection. + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); @@ -739,7 +881,7 @@ void SnoopHitag(uint32_t type) { // Check if frame was captured if(rxlen > 0) { frame_count++; - if (!LogTrace(rx,nbytes(rxlen),response,0,reader_frame)) { + if (!LogTraceHitag(rx,rxlen,response,0,reader_frame)) { DbpString("Trace full"); break; } @@ -799,8 +941,8 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { bQuiet = false; // Clean up trace and prepare it for storing frames - iso14a_set_tracing(TRUE); - iso14a_clear_trace(); + iso14a_set_tracing(TRUE); + iso14a_clear_trace(); auth_table_len = 0; auth_table_pos = 0; memset(auth_table, 0x00, AUTH_TABLE_LENGTH); @@ -825,6 +967,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { // Set up simulator mode, frequency divisor which will drive the FPGA // and analog mux selection. + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); @@ -902,7 +1045,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { if(rxlen > 4) { frame_count++; if (!bQuiet) { - if (!LogTrace(rx,nbytes(rxlen),response,0,true)) { + if (!LogTraceHitag(rx,rxlen,response,0,true)) { DbpString("Trace full"); if (bQuitTraceFull) { break; @@ -931,7 +1074,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { hitag_send_frame(tx,txlen); // Store the frame in the trace if (!bQuiet) { - if (!LogTrace(tx,nbytes(txlen),0,0,false)) { + if (!LogTraceHitag(tx,txlen,0,0,false)) { DbpString("Trace full"); if (bQuitTraceFull) { break; @@ -982,28 +1125,45 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { int t_wait = HITAG_T_WAIT_MAX; bool bStop; bool bQuitTraceFull = false; - + + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + // Reset the return status + bSuccessful = false; + // Clean up trace and prepare it for storing frames - iso14a_set_tracing(TRUE); - iso14a_clear_trace(); + iso14a_set_tracing(TRUE); + iso14a_clear_trace(); DbpString("Starting Hitag reader family"); // Check configuration switch(htf) { case RHT2F_PASSWORD: { - Dbprintf("List identifier in password mode"); + Dbprintf("List identifier in password mode"); memcpy(password,htd->pwd.password,4); + blocknr = 0; bQuitTraceFull = false; bQuiet = false; bPwd = false; } break; + case RHT2F_AUTHENTICATE: { - DbpString("Authenticating in crypto mode"); + DbpString("Authenticating using nr,ar pair:"); memcpy(NrAr,htd->auth.NrAr,8); - Dbprintf("Reader-challenge:"); Dbhexdump(8,NrAr,false); bQuiet = false; bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + } break; + + case RHT2F_CRYPTO: { + DbpString("Authenticating using key:"); + memcpy(key,htd->crypto.key,6); + Dbhexdump(6,key,false); + blocknr = 0; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; bQuitTraceFull = true; } break; @@ -1067,26 +1227,26 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { lastbit = 1; bStop = false; - // Tag specific configuration settings (sof, timings, etc.) - if (htf < 10){ - // hitagS settings - reset_sof = 1; - t_wait = 200; - DbpString("Configured for hitagS reader"); - } else if (htf < 20) { - // hitag1 settings - reset_sof = 1; - t_wait = 200; - 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"); + // Tag specific configuration settings (sof, timings, etc.) + if (htf < 10){ + // hitagS settings + reset_sof = 1; + t_wait = 200; + DbpString("Configured for hitagS reader"); + } else if (htf < 20) { + // hitag1 settings + reset_sof = 1; + t_wait = 200; + 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"); } else { - Dbprintf("Error, unknown hitag reader type: %d",htf); - return; - } + Dbprintf("Error, unknown hitag reader type: %d",htf); + return; + } while(!bStop && !BUTTON_PRESS()) { // Watchdog hit @@ -1096,7 +1256,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { if(rxlen > 0) { frame_count++; if (!bQuiet) { - if (!LogTrace(rx,nbytes(rxlen),response,0,false)) { + if (!LogTraceHitag(rx,rxlen,response,0,false)) { DbpString("Trace full"); if (bQuitTraceFull) { break; @@ -1116,6 +1276,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { case RHT2F_AUTHENTICATE: { bStop = !hitag2_authenticate(rx,rxlen,tx,&txlen); } break; + case RHT2F_CRYPTO: { + bStop = !hitag2_crypto(rx,rxlen,tx,&txlen); + } break; case RHT2F_TEST_AUTH_ATTEMPTS: { bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen); } break; @@ -1147,7 +1310,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { frame_count++; if (!bQuiet) { // Store the frame in the trace - if (!LogTrace(tx,nbytes(txlen),HITAG_T_WAIT_2,0,true)) { + if (!LogTraceHitag(tx,txlen,HITAG_T_WAIT_2,0,true)) { if (bQuitTraceFull) { break; } else { @@ -1228,7 +1391,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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); }