X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/4ecde0e1ff60d5e3d217dc1e5ca12c78864804cc..e1778858ddc53a6a82e8ee24f02e6b673687f69a:/armsrc/hitag2.c diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c index 2d064565..ab839109 100644 --- a/armsrc/hitag2.c +++ b/armsrc/hitag2.c @@ -16,22 +16,19 @@ // (c) 2012 Roel Verdult //----------------------------------------------------------------------------- -#include "../include/proxmark3.h" +#include "proxmark3.h" #include "apps.h" #include "util.h" -#include "../include/hitag2.h" +#include "hitag2.h" #include "string.h" #include "BigBuf.h" static bool bQuiet; - static bool bCrypto; static bool bAuthenticating; static bool bPwd; static bool bSuccessful; - - struct hitag2_tag { uint32_t uid; enum { @@ -97,7 +94,6 @@ static uint64_t cipher_state; #define rotl64(x, n) ((((u64)(x))<<((n)&63))+(((u64)(x))>>((0-(n))&63))) // Single bit Hitag2 functions: - #define i4(x,a,b,c,d) ((u32)((((x)>>(a))&1)+(((x)>>(b))&1)*2+(((x)>>(c))&1)*4+(((x)>>(d))&1)*8)) static const u32 ht2_f4a = 0x2C79; // 0010 1100 0111 1001 @@ -106,7 +102,7 @@ static const u32 ht2_f5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 101 static u32 _f20 (const u64 x) { - u32 i5; + u32 i5; i5 = ((ht2_f4a >> i4 (x, 1, 2, 4, 5)) & 1)* 1 + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2 @@ -119,8 +115,8 @@ static u32 _f20 (const u64 x) static u64 _hitag2_init (const u64 key, const u32 serial, const u32 IV) { - u32 i; - u64 x = ((key & 0xFFFF) << 32) + serial; + u32 i; + u64 x = ((key & 0xFFFF) << 32) + serial; for (i = 0; i < 32; i++) { @@ -132,7 +128,7 @@ static u64 _hitag2_init (const u64 key, const u32 serial, const u32 IV) static u64 _hitag2_round (u64 *state) { - u64 x = *state; + u64 x = *state; x = (x >> 1) + ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) @@ -144,24 +140,31 @@ static u64 _hitag2_round (u64 *state) return _f20 (x); } +// "MIKRON" = O N M I K R +// Key = 4F 4E 4D 49 4B 52 - Secret 48-bit key +// Serial = 49 43 57 69 - Serial number of the tag, transmitted in clear +// Random = 65 6E 45 72 - Random IV, transmitted in clear +//~28~DC~80~31 = D7 23 7F CE - Authenticator value = inverted first 4 bytes of the keystream + +// The code below must print out "D7 23 7F CE 8C D0 37 A9 57 49 C1 E6 48 00 8A B6". +// The inverse of the first 4 bytes is sent to the tag to authenticate. +// The rest is encrypted by XORing it with the subsequent keystream. + static u32 _hitag2_byte (u64 * x) { - u32 i, c; + u32 i, c; for (i = 0, c = 0; i < 8; i++) c += (u32) _hitag2_round (x) << (i^7); return c; } -static int hitag2_reset(void) -{ +static int hitag2_reset(void) { tag.state = TAG_STATE_RESET; tag.crypto_active = 0; return 0; } -static int hitag2_init(void) -{ -// memcpy(&tag, &resetdata, sizeof(tag)); +static int hitag2_init(void) { hitag2_reset(); return 0; } @@ -223,16 +226,16 @@ static int hitag2_cipher_transcrypt(uint64_t* cs, byte_t *data, unsigned int byt #define HITAG_T_WAIT_2 90 /* T_wresp should be 199..206 */ #define HITAG_T_WAIT_MAX 300 /* bit more than HITAG_T_WAIT_1 + HITAG_T_WAIT_2 */ -#define HITAG_T_TAG_ONE_HALF_PERIOD 10 -#define HITAG_T_TAG_TWO_HALF_PERIOD 25 -#define HITAG_T_TAG_THREE_HALF_PERIOD 41 -#define HITAG_T_TAG_FOUR_HALF_PERIOD 57 +#define HITAG_T_TAG_ONE_HALF_PERIOD 10 +#define HITAG_T_TAG_TWO_HALF_PERIOD 25 +#define HITAG_T_TAG_THREE_HALF_PERIOD 41 +#define HITAG_T_TAG_FOUR_HALF_PERIOD 57 -#define HITAG_T_TAG_HALF_PERIOD 16 -#define HITAG_T_TAG_FULL_PERIOD 32 +#define HITAG_T_TAG_HALF_PERIOD 16 +#define HITAG_T_TAG_FULL_PERIOD 32 -#define HITAG_T_TAG_CAPTURE_ONE_HALF 13 -#define HITAG_T_TAG_CAPTURE_TWO_HALF 25 +#define HITAG_T_TAG_CAPTURE_ONE_HALF 13 +#define HITAG_T_TAG_CAPTURE_TWO_HALF 25 #define HITAG_T_TAG_CAPTURE_THREE_HALF 41 #define HITAG_T_TAG_CAPTURE_FOUR_HALF 57 @@ -411,7 +414,7 @@ static void hitag_reader_send_bit(int bit) { // Binary puls length modulation (BPLM) is used to encode the data stream // This means that a transmission of a one takes longer than that of a zero - // Enable modulation, which means, drop the the field + // Enable modulation, which means, drop the field HIGH(GPIO_SSC_DOUT); // Wait for 4-10 times the carrier period @@ -424,11 +427,10 @@ static void hitag_reader_send_bit(int bit) { if(bit == 0) { // Zero bit: |_-| while(AT91C_BASE_TC0->TC_CV < T0*22); - // SpinDelayUs(16*8); + } else { // One bit: |_--| while(AT91C_BASE_TC0->TC_CV < T0*28); - // SpinDelayUs(22*8); } LED_A_OFF(); } @@ -442,7 +444,7 @@ static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len) } // Send EOF AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; - // Enable modulation, which means, drop the the field + // Enable modulation, which means, drop the field HIGH(GPIO_SSC_DOUT); // Wait for 4-10 times the carrier period while(AT91C_BASE_TC0->TC_CV < T0*6); @@ -475,26 +477,26 @@ static bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* *txlen = 32; memcpy(tx,password,4); bPwd = true; - memcpy(tag.sectors[blocknr],rx,4); - blocknr++; + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; } else { - 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); + 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; @@ -544,9 +546,9 @@ static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* tx bCrypto = false; } } else { - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } } break; // Received UID, crypto tag answer @@ -560,20 +562,20 @@ static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* tx hitag2_cipher_transcrypt(&cipher_state,tx+4,4,0); *txlen = 64; bCrypto = true; - bAuthenticating = true; + bAuthenticating = true; } else { // Check if we received answer tag (at) if (bAuthenticating) { - bAuthenticating = false; + bAuthenticating = false; } else { - // Store the received block - memcpy(tag.sectors[blocknr],rx,4); - blocknr++; + // Store the received block + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; } if (blocknr > 7) { - DbpString("Read succesful!"); - bSuccessful = true; - return false; + DbpString("Read succesful!"); + bSuccessful = true; + return false; } *txlen = 10; tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); @@ -589,11 +591,11 @@ static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* tx } - if(bCrypto) { - // We have to return now to avoid double encryption - if (!bAuthenticating) { - hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8); - } + 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; @@ -625,8 +627,7 @@ static bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size bCrypto = true; } else { DbpString("Authentication succesful!"); - // We are done... for now - return false; + return true; } } break; @@ -697,6 +698,42 @@ 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; @@ -710,22 +747,26 @@ void SnoopHitag(uint32_t type) { byte_t rx[HITAG_FRAME_LEN]; size_t rxlen=0; + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + + // free eventually allocated BigBuf memory + BigBuf_free(); BigBuf_Clear_ext(false); + + // Clean up trace and prepare it for storing frames + clear_trace(); + set_tracing(TRUE); + auth_table_len = 0; auth_table_pos = 0; - BigBuf_free(); + auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); - - // Clean up trace and prepare it for storing frames - set_tracing(TRUE); - clear_trace(); DbpString("Starting Hitag2 snoop"); LED_D_ON(); // 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 | FPGA_LF_EDGE_DETECT_TOGGLE_MODE); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); @@ -763,7 +804,7 @@ void SnoopHitag(uint32_t type) { bSkip = true; tag_sof = 4; - while(!BUTTON_PRESS()) { + while(!BUTTON_PRESS() && !usb_poll_validate_length()) { // Watchdog hit WDT_HIT(); @@ -905,7 +946,7 @@ void SnoopHitag(uint32_t type) { AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_A_OFF(); - + set_tracing(TRUE); // Dbprintf("frame received: %d",frame_count); // Dbprintf("Authentication Attempts: %d",(auth_table_len/8)); // DbpString("All done"); @@ -922,17 +963,22 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { bool bQuitTraceFull = false; bQuiet = false; + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + + // free eventually allocated BigBuf memory + BigBuf_free(); BigBuf_Clear_ext(false); + + // Clean up trace and prepare it for storing frames + clear_trace(); + set_tracing(TRUE); + auth_table_len = 0; auth_table_pos = 0; byte_t* auth_table; - BigBuf_free(); + auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); - // Clean up trace and prepare it for storing frames - set_tracing(TRUE); - clear_trace(); - DbpString("Starting Hitag2 simulation"); LED_D_ON(); hitag2_init(); @@ -953,8 +999,7 @@ 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 | 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(); @@ -989,7 +1034,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { // Enable and reset counter AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - while(!BUTTON_PRESS()) { + while(!BUTTON_PRESS() && !usb_poll_validate_length()) { // Watchdog hit WDT_HIT(); @@ -1093,7 +1138,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Sim Stopped"); - + set_tracing(TRUE); } void ReaderHitag(hitag_function htf, hitag_data* htd) { @@ -1117,10 +1162,10 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bSuccessful = false; // Clean up trace and prepare it for storing frames - set_tracing(TRUE); clear_trace(); - - DbpString("Starting Hitag reader family"); + set_tracing(TRUE); + + //DbpString("Starting Hitag reader family"); // Check configuration switch(htf) { @@ -1145,7 +1190,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { 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; @@ -1162,9 +1207,16 @@ 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); + set_tracing(FALSE); return; } break; } @@ -1214,27 +1266,28 @@ 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); + set_tracing(FALSE); + return; + } + uint8_t attempt_count=0; while(!bStop && !BUTTON_PRESS()) { // Watchdog hit WDT_HIT(); @@ -1243,13 +1296,12 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { if(rxlen > 0) { frame_count++; if (!bQuiet) { - if (!LogTraceHitag(rx,rxlen,response,0,false)) { + if (!LogTraceHitag(rx,rxlen, response, 0, false)) { DbpString("Trace full"); - if (bQuitTraceFull) { + if (bQuitTraceFull) break; - } else { + else bQuiet = true; - } } } } @@ -1269,8 +1321,14 @@ 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); + set_tracing(FALSE); return; } break; } @@ -1314,6 +1372,8 @@ 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) { @@ -1363,10 +1423,13 @@ 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; @@ -1378,7 +1441,7 @@ 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"); - cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); -} +// Dbprintf("DONE: frame received: %d",frame_count); + cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); + set_tracing(FALSE); +} \ No newline at end of file