X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/43751d2a653d71a80348a2843f1f61a1ac95dba8..a3bef9863b9e06a820c7559b9caffeaaa1bb575b:/armsrc/hitag2.c diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c index aa9ce237..7cdabefa 100644 --- a/armsrc/hitag2.c +++ b/armsrc/hitag2.c @@ -16,46 +16,26 @@ // (c) 2012 Roel Verdult //----------------------------------------------------------------------------- +#include "hitag2.h" + #include "proxmark3.h" +#include "cmd.h" #include "apps.h" #include "util.h" -#include "hitag2.h" +#include "hitag.h" #include "string.h" +#include "BigBuf.h" +#include "fpgaloader.h" +#include "protocols.h" static bool bQuiet; -bool bCrypto; -bool bAuthenticating; -bool bPwd; -bool bSuccessful; +static bool bCrypto; +static bool bAuthenticating; +static bool bPwd; +static bool bSuccessful; -size_t nbytes(size_t nbits) { - return (nbits/8)+((nbits%8)>0); -} -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; @@ -66,44 +46,48 @@ struct hitag2_tag { TAG_STATE_WRITING = 0x04, // In write command, awaiting sector contents to be written } state; unsigned int active_sector; - byte_t crypto_active; + uint8_t crypto_active; uint64_t cs; - byte_t sectors[12][4]; + uint8_t sectors[12][4]; }; static struct hitag2_tag tag = { - .state = TAG_STATE_RESET, - .sectors = { // Password mode: | Crypto mode: - [0] = { 0x02, 0x4e, 0x02, 0x20}, // UID | UID - [1] = { 0x4d, 0x49, 0x4b, 0x52}, // Password RWD | 32 bit LSB key - [2] = { 0x20, 0xf0, 0x4f, 0x4e}, // Reserved | 16 bit MSB key, 16 bit reserved - [3] = { 0x0e, 0xaa, 0x48, 0x54}, // Configuration, password TAG | Configuration, password TAG - [4] = { 0x46, 0x5f, 0x4f, 0x4b}, // Data: F_OK - [5] = { 0x55, 0x55, 0x55, 0x55}, // Data: UUUU - [6] = { 0xaa, 0xaa, 0xaa, 0xaa}, // Data: .... - [7] = { 0x55, 0x55, 0x55, 0x55}, // Data: UUUU - [8] = { 0x00, 0x00, 0x00, 0x00}, // RSK Low - [9] = { 0x00, 0x00, 0x00, 0x00}, // RSK High - [10] = { 0x00, 0x00, 0x00, 0x00}, // RCF - [11] = { 0x00, 0x00, 0x00, 0x00}, // SYNC - }, + .state = TAG_STATE_RESET, + .sectors = { // Password mode: | Crypto mode: + [0] = { 0x02, 0x4e, 0x02, 0x20}, // UID | UID + [1] = { 0x4d, 0x49, 0x4b, 0x52}, // Password RWD | 32 bit LSB key + [2] = { 0x20, 0xf0, 0x4f, 0x4e}, // Reserved | 16 bit MSB key, 16 bit reserved + [3] = { 0x0e, 0xaa, 0x48, 0x54}, // Configuration, password TAG | Configuration, password TAG + [4] = { 0x46, 0x5f, 0x4f, 0x4b}, // Data: F_OK + [5] = { 0x55, 0x55, 0x55, 0x55}, // Data: UUUU + [6] = { 0xaa, 0xaa, 0xaa, 0xaa}, // Data: .... + [7] = { 0x55, 0x55, 0x55, 0x55}, // Data: UUUU + [8] = { 0x00, 0x00, 0x00, 0x00}, // RSK Low + [9] = { 0x00, 0x00, 0x00, 0x00}, // RSK High + [10] = { 0x00, 0x00, 0x00, 0x00}, // RCF + [11] = { 0x00, 0x00, 0x00, 0x00}, // SYNC + }, }; -//#define TRACE_LENGTH 3000 -//uint8_t *trace = (uint8_t *) BigBuf; -//int traceLen = 0; -//int rsamples = 0; +static enum { + WRITE_STATE_START = 0x0, + WRITE_STATE_PAGENUM_WRITTEN, + WRITE_STATE_PROG +} writestate; -#define AUTH_TABLE_OFFSET FREE_BUFFER_OFFSET -#define AUTH_TABLE_LENGTH FREE_BUFFER_SIZE -byte_t* auth_table = (byte_t *)BigBuf+AUTH_TABLE_OFFSET; -size_t auth_table_pos = 0; -size_t auth_table_len = AUTH_TABLE_LENGTH; -byte_t password[4]; -byte_t NrAr[8]; -byte_t key[8]; -uint64_t cipher_state; +// ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. +// Historically it used to be FREE_BUFFER_SIZE, which was 2744. +#define AUTH_TABLE_LENGTH 2744 +static uint8_t *auth_table; +static size_t auth_table_pos = 0; +static size_t auth_table_len = AUTH_TABLE_LENGTH; + +static uint8_t password[4]; +static uint8_t NrAr[8]; +static uint8_t key[8]; +static uint8_t writedata[4]; +static 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. @@ -111,112 +95,89 @@ uint64_t cipher_state; // No warranties or guarantees of any kind. // This code is released into the public domain by its author. -// Basic macros: - -#define u8 uint8_t -#define u32 uint32_t -#define u64 uint64_t -#define rev8(x) ((((x)>>7)&1)+((((x)>>6)&1)<<1)+((((x)>>5)&1)<<2)+((((x)>>4)&1)<<3)+((((x)>>3)&1)<<4)+((((x)>>2)&1)<<5)+((((x)>>1)&1)<<6)+(((x)&1)<<7)) -#define rev16(x) (rev8 (x)+(rev8 (x>> 8)<< 8)) -#define rev32(x) (rev16(x)+(rev16(x>>16)<<16)) -#define rev64(x) (rev32(x)+(rev32(x>>32)<<32)) -#define bit(x,n) (((x)>>(n))&1) -#define bit32(x,n) ((((x)[(n)>>5])>>((n)))&1) -#define inv32(x,i,n) ((x)[(i)>>5]^=((u32)(n))<<((i)&31)) -#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)) +#define i4(x,a,b,c,d) ((uint32_t)((((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 -static const u32 ht2_f4b = 0x6671; // 0110 0110 0111 0001 -static const u32 ht2_f5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 1011 +static const uint32_t ht2_f4a = 0x2C79; // 0010 1100 0111 1001 +static const uint32_t ht2_f4b = 0x6671; // 0110 0110 0111 0001 +static const uint32_t ht2_f5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 1011 -static u32 _f20 (const u64 x) -{ - u32 i5; +static uint32_t _f20(const uint64_t x) { + uint32_t i5; - i5 = ((ht2_f4a >> i4 (x, 1, 2, 4, 5)) & 1)* 1 - + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2 - + ((ht2_f4b >> i4 (x,16,20,22,25)) & 1)* 4 - + ((ht2_f4b >> i4 (x,27,28,30,32)) & 1)* 8 - + ((ht2_f4a >> i4 (x,33,42,43,45)) & 1)*16; + i5 = ((ht2_f4a >> i4(x, 1, 2, 4, 5)) & 1) * 1 + + ((ht2_f4b >> i4(x, 7,11,13,14)) & 1) * 2 + + ((ht2_f4b >> i4(x,16,20,22,25)) & 1) * 4 + + ((ht2_f4b >> i4(x,27,28,30,32)) & 1) * 8 + + ((ht2_f4a >> i4(x,33,42,43,45)) & 1) * 16; return (ht2_f5c >> i5) & 1; } -static u64 _hitag2_init (const u64 key, const u32 serial, const u32 IV) -{ - u32 i; - u64 x = ((key & 0xFFFF) << 32) + serial; +static uint64_t _hitag2_init(const uint64_t key, const uint32_t serial, const uint32_t IV) { + uint32_t i; + uint64_t x = ((key & 0xFFFF) << 32) + serial; - for (i = 0; i < 32; i++) - { + for (i = 0; i < 32; i++) { x >>= 1; - x += (u64) (_f20 (x) ^ (((IV >> i) ^ (key >> (i+16))) & 1)) << 47; + x += (uint64_t)(_f20(x) ^ (((IV >> i) ^ (key >> (i+16))) & 1)) << 47; } return x; } -static u64 _hitag2_round (u64 *state) -{ - u64 x = *state; +static uint64_t _hitag2_round(uint64_t *state) { + uint64_t x = *state; x = (x >> 1) + - ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) - ^ (x >> 7) ^ (x >> 8) ^ (x >> 16) ^ (x >> 22) - ^ (x >> 23) ^ (x >> 26) ^ (x >> 30) ^ (x >> 41) - ^ (x >> 42) ^ (x >> 43) ^ (x >> 46) ^ (x >> 47)) & 1) << 47); + ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) + ^ (x >> 7) ^ (x >> 8) ^ (x >> 16) ^ (x >> 22) + ^ (x >> 23) ^ (x >> 26) ^ (x >> 30) ^ (x >> 41) + ^ (x >> 42) ^ (x >> 43) ^ (x >> 46) ^ (x >> 47)) & 1) << 47); *state = x; - return _f20 (x); + return _f20(x); } -static u32 _hitag2_byte (u64 * x) -{ - u32 i, c; - - for (i = 0, c = 0; i < 8; i++) c += (u32) _hitag2_round (x) << (i^7); +static uint32_t _hitag2_byte(uint64_t *x) { + uint32_t i, c; + for (i = 0, c = 0; i < 8; i++) { + c += (uint32_t) _hitag2_round(x) << (i^7); + } return c; } -int hitag2_reset(void) -{ +static int hitag2_reset(void) { tag.state = TAG_STATE_RESET; tag.crypto_active = 0; return 0; } -int hitag2_init(void) -{ -// memcpy(&tag, &resetdata, sizeof(tag)); +static int hitag2_init(void) { 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); +static void hitag2_cipher_reset(struct hitag2_tag *tag, const uint8_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); uint32_t iv_ = (((uint32_t)(iv[0]))) | - (((uint32_t)(iv[1])) << 8) | - (((uint32_t)(iv[2])) << 16) | - (((uint32_t)(iv[3])) << 24); - tag->cs = _hitag2_init(rev64(key), rev32(uid), rev32(iv_)); + (((uint32_t)(iv[1])) << 8) | + (((uint32_t)(iv[2])) << 16) | + (((uint32_t)(iv[3])) << 24); + tag->cs = _hitag2_init(REV64(key), REV32(uid), REV32(iv_)); } -static int hitag2_cipher_authenticate(uint64_t* cs, const byte_t *authenticator_is) -{ - byte_t authenticator_should[4]; +static int hitag2_cipher_authenticate(uint64_t *cs, const uint8_t *authenticator_is) { + uint8_t authenticator_should[4]; authenticator_should[0] = ~_hitag2_byte(cs); authenticator_should[1] = ~_hitag2_byte(cs); authenticator_should[2] = ~_hitag2_byte(cs); @@ -224,11 +185,10 @@ static int hitag2_cipher_authenticate(uint64_t* cs, const byte_t *authenticator_ return (memcmp(authenticator_should, authenticator_is, 4) == 0); } -static int hitag2_cipher_transcrypt(uint64_t* cs, byte_t *data, unsigned int bytes, unsigned int bits) -{ +static int hitag2_cipher_transcrypt(uint64_t *cs, uint8_t *data, unsigned int bytes, unsigned int bits) { int i; - for(i=0; i 36 */ -#define HITAG_T_LOW 8 /* T_LOW should be 4..10 */ -#define HITAG_T_0_MIN 15 /* T[0] should be 18..22 */ -#define HITAG_T_1_MIN 25 /* T[1] should be 26..30 */ -//#define HITAG_T_EOF 40 /* T_EOF should be > 36 */ -#define HITAG_T_EOF 80 /* T_EOF should be > 36 */ -#define HITAG_T_WAIT_1 200 /* T_wresp should be 199..206 */ -#define HITAG_T_WAIT_2 90 /* T_wresp should be 199..206 */ +#define HITAG_FRAME_LEN 20 +#define HITAG_T_STOP 36 /* T_EOF should be > 36 */ +#define HITAG_T_LOW 8 /* T_LOW should be 4..10 */ +#define HITAG_T_0_MIN 15 /* T[0] should be 18..22 */ +#define HITAG_T_1_MIN 25 /* T[1] should be 26..30 */ +//#define HITAG_T_EOF 40 /* T_EOF should be > 36 */ +#define HITAG_T_EOF 80 /* T_EOF should be > 36 */ +#define HITAG_T_WAIT_1 200 /* T_wresp should be 199..206 */ +#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_PROG 614 -#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_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 +#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_THREE_HALF 41 +#define HITAG_T_TAG_CAPTURE_FOUR_HALF 57 static void hitag_send_bit(int bit) { LED_A_ON(); - // Reset clock for the next bit + // Reset clock for the next bit AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; - + // Fixed modulation, earlier proxmark version used inverted signal - if(bit == 0) { + if (bit == 0) { // Manchester: Unloaded, then loaded |__--| LOW(GPIO_SSC_DOUT); - while(AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_HALF_PERIOD); + while (AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_HALF_PERIOD); HIGH(GPIO_SSC_DOUT); - while(AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_FULL_PERIOD); + while (AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_FULL_PERIOD); } else { // Manchester: Loaded, then unloaded |--__| HIGH(GPIO_SSC_DOUT); - while(AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_HALF_PERIOD); + while (AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_HALF_PERIOD); LOW(GPIO_SSC_DOUT); - while(AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_FULL_PERIOD); + while (AT91C_BASE_TC0->TC_CV < T0*HITAG_T_TAG_FULL_PERIOD); } LED_A_OFF(); } -static void hitag_send_frame(const byte_t* frame, size_t frame_len) +static void hitag_send_frame(const uint8_t *frame, size_t frame_len) { // Send start of frame - for(size_t i=0; i<5; i++) { + for(size_t i = 0; i < 5; i++) { hitag_send_bit(1); } // Send the content of the frame - for(size_t i=0; i> (7-(i%8)))&1); + for (size_t i = 0; i < frame_len; i++) { + hitag_send_bit((frame[i/8] >> (7-(i%8))) & 0x01); } // Drop the modulation LOW(GPIO_SSC_DOUT); } -void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) -{ - byte_t rx_air[HITAG_FRAME_LEN]; - +static void hitag2_handle_reader_command(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *txlen) { + uint8_t rx_air[HITAG_FRAME_LEN]; + // Copy the (original) received frame how it is send over the air - memcpy(rx_air,rx,nbytes(rxlen)); + memcpy(rx_air, rx, nbytes(rxlen)); - if(tag.crypto_active) { - hitag2_cipher_transcrypt(&(tag.cs),rx,rxlen/8,rxlen%8); + if (tag.crypto_active) { + hitag2_cipher_transcrypt(&(tag.cs), rx, rxlen/8, rxlen%8); } - - // Reset the transmission frame length + + // Reset the transmission frame length *txlen = 0; - + // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { - // Received 11000 from the reader, request for UID, send UID + // Received 11000 from the reader, request for UID, send UID case 05: { // Always send over the air in the clear plaintext mode - if(rx_air[0] != 0xC0) { + if (rx_air[0] != HITAG2_START_AUTH) { // Unknown frame ? return; } *txlen = 32; - memcpy(tx,tag.sectors[0],4); + memcpy(tx, tag.sectors[0], 4); tag.crypto_active = 0; } break; - // Read/Write command: ..xx x..y yy with yyy == ~xxx, xxx is sector number + // Read/Write command: ..xx x..y yy with yyy == ~xxx, xxx is sector number case 10: { - unsigned int sector = (~( ((rx[0]<<2)&0x04) | ((rx[1]>>6)&0x03) ) & 0x07); + unsigned int sector = (~( ((rx[0]<<2) & 0x04) | ((rx[1]>>6) & 0x03) ) & 0x07); // Verify complement of sector index - if(sector != ((rx[0]>>3)&0x07)) { + if (sector != ((rx[0]>>3) & 0x07)) { //DbpString("Transmission error (read/write)"); return; } switch (rx[0] & 0xC6) { // Read command: 11xx x00y - case 0xC0: - memcpy(tx,tag.sectors[sector],4); + case HITAG2_READ_PAGE: + memcpy(tx, tag.sectors[sector], 4); *txlen = 32; - break; - - // Inverted Read command: 01xx x10y - case 0x44: - for (size_t i=0; i<4; i++) { + break; + + // Inverted Read command: 01xx x10y + case HITAG2_READ_PAGE_INVERTED: + for (size_t i = 0; i < 4; i++) { tx[i] = tag.sectors[sector][i] ^ 0xff; } *txlen = 32; - break; + break; // Write command: 10xx x01y - case 0x82: + case HITAG2_WRITE_PAGE: // Prepare write, acknowledge by repeating command - memcpy(tx,rx,nbytes(rxlen)); + memcpy(tx, rx, nbytes(rxlen)); *txlen = rxlen; tag.active_sector = sector; - tag.state=TAG_STATE_WRITING; - break; - + tag.state = TAG_STATE_WRITING; + break; + // Unknown command default: - Dbprintf("Uknown command: %02x %02x",rx[0],rx[1]); + Dbprintf("Unknown command: %02x %02x", rx[0], rx[1]); return; - break; + break; } } break; // Writing data or Reader password case 32: { - if(tag.state == TAG_STATE_WRITING) { + if (tag.state == TAG_STATE_WRITING) { // These are the sector contents to be written. We don't have to do anything else. - memcpy(tag.sectors[tag.active_sector],rx,nbytes(rxlen)); - tag.state=TAG_STATE_RESET; + memcpy(tag.sectors[tag.active_sector], rx, nbytes(rxlen)); + tag.state = TAG_STATE_RESET; return; } else { // Received RWD password, respond with configuration and our password - if(memcmp(rx,tag.sectors[1],4) != 0) { + if (memcmp(rx, tag.sectors[1], 4) != 0) { DbpString("Reader password is wrong"); return; } *txlen = 32; - memcpy(tx,tag.sectors[3],4); + memcpy(tx, tag.sectors[3], 4); } } break; @@ -398,16 +354,16 @@ void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, si case 64: { // Store the authentication attempt if (auth_table_len < (AUTH_TABLE_LENGTH-8)) { - memcpy(auth_table+auth_table_len,rx,8); + memcpy(auth_table+auth_table_len, rx, 8); auth_table_len += 8; } // Reset the cipher state - hitag2_cipher_reset(&tag,rx); + hitag2_cipher_reset(&tag, rx); // Check if the authentication was correct - if(!hitag2_cipher_authenticate(&(tag.cs),rx+4)) { + if (!hitag2_cipher_authenticate(&(tag.cs), rx+4)) { // The reader failed to authenticate, do nothing - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]); + Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!", rx[0], rx[1], rx[2], rx[3], rx[4], rx[5], rx[6], rx[7]); return; } // Succesful, but commented out reporting back to the Host, this may delay to much. @@ -417,220 +373,295 @@ void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, si tag.crypto_active = 1; // Use the tag password as response - memcpy(tx,tag.sectors[3],4); + memcpy(tx, tag.sectors[3], 4); *txlen = 32; } break; } -// LogTraceHitag(rx,rxlen,0,0,false); -// LogTraceHitag(tx,*txlen,0,0,true); - - if(tag.crypto_active) { + // 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); } } static void hitag_reader_send_bit(int bit) { LED_A_ON(); - // Reset clock for the next bit + // Reset clock for the next bit AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; - + // 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 - while(AT91C_BASE_TC0->TC_CV < T0*6); - // SpinDelayUs(8*8); - + + // t_low = 4...10 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*6); + // Disable modulation, just activates the field again LOW(GPIO_SSC_DOUT); - - if(bit == 0) { - // Zero bit: |_-| - while(AT91C_BASE_TC0->TC_CV < T0*22); - // SpinDelayUs(16*8); + + if (bit == 0) { + // Zero bit: |_-|, T[0] = 18...22 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*22); } else { - // One bit: |_--| - while(AT91C_BASE_TC0->TC_CV < T0*28); - // SpinDelayUs(22*8); + // One bit: |_--|, T[1] = 26...32 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*28); } LED_A_OFF(); } -static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len) + +static void hitag_reader_send_frame(const uint8_t *frame, size_t frame_len) { // Send the content of the frame - for(size_t i=0; i> (7-(i%8)))&1); + for(size_t i = 0; i < frame_len; i++) { + hitag_reader_send_bit((frame[i/8] >> (7-(i%8))) & 0x01); } - // Send EOF + // 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); + // t_low = 4...10 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*6); // Disable modulation, just activates the field again LOW(GPIO_SSC_DOUT); + // t_stop > 36 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*36); } 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; - - // 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 (after sending password) - if (bPwd) { - DbpString("Password failed!"); +//----------------------------------------------------------------------------- +// Hitag2 operations +//----------------------------------------------------------------------------- + +static bool hitag2_write_page(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *txlen) { + switch (writestate) { + case WRITE_STATE_START: + tx[0] = HITAG2_WRITE_PAGE | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); + *txlen = 10; + writestate = WRITE_STATE_PAGENUM_WRITTEN; + break; + case WRITE_STATE_PAGENUM_WRITTEN: + // Check if page number was received correctly + if ((rxlen == 10) + && (rx[0] == (HITAG2_WRITE_PAGE | (blocknr << 3) | ((blocknr^7) >> 2))) + && (rx[1] == (((blocknr & 0x3) ^ 0x3) << 6))) { + *txlen = 32; + memset(tx, 0, HITAG_FRAME_LEN); + memcpy(tx, writedata, 4); + writestate = WRITE_STATE_PROG; + } else { + Dbprintf("hitag2_write_page: Page number was not received correctly: rxlen=%d rx=%02x%02x%02x%02x", + rxlen, rx[0], rx[1], rx[2], rx[3]); + bSuccessful = false; return false; } - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; - - // Received UID, tag password - case 32: { - if (!bPwd) { - *txlen = 32; - memcpy(tx,password,4); - bPwd = true; - memcpy(tag.sectors[blocknr],rx,4); - blocknr++; + break; + case WRITE_STATE_PROG: + if (rxlen == 0) { + bSuccessful = true; } 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); + bSuccessful = false; + Dbprintf("hitag2_write_page: unexpected rx data (%d) after page write", rxlen); + } + return false; + default: + DbpString("hitag2_write_page: Unknown state %d"); + bSuccessful = false; + return false; + } + + return true; +} + +static bool hitag2_password(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *txlen, bool write) { + // Reset the transmission frame length + *txlen = 0; + + if (bPwd && !bAuthenticating && write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { + return false; + } + } else { + // 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 (after sending password) + if (bPwd) { + DbpString("Password failed!"); + return false; + } + tx[0] = HITAG2_START_AUTH; + *txlen = 5; } - - blocknr++; - if (blocknr > 7) { - DbpString("Read succesful!"); - bSuccessful = true; - return false; + break; + + // Received UID, tag password + case 32: { + if (!bPwd) { + bPwd = true; + bAuthenticating = true; + memcpy(tx, password, 4); + *txlen = 32; + } else { + if (bAuthenticating) { + bAuthenticating = false; + if (write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { + return false; + } + break; + } + } else { + memcpy(tag.sectors[blocknr], rx, 4); + blocknr++; + } + + if (blocknr > 7) { + DbpString("Read successful!"); + bSuccessful = true; + return false; + } + tx[0] = HITAG2_READ_PAGE | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); + *txlen = 10; + } } - *txlen = 10; - tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); - tx[1] = ((blocknr^7) << 6); + break; + + // Unexpected response + default: { + Dbprintf("Unknown frame length: %d", rxlen); + return false; } - } break; - - // Unexpected response - default: { - Dbprintf("Uknown frame length: %d",rxlen); - return false; - } break; + break; + } } + return true; } -bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { +static bool hitag2_crypto(uint8_t *rx, const size_t rxlen, uint8_t *tx, size_t *txlen, bool write) { // Reset the transmission frame length *txlen = 0; - - if(bCrypto) { - hitag2_cipher_transcrypt(&cipher_state,rx,rxlen/8,rxlen%8); + + 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); + if (bCrypto && !bAuthenticating && write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { return false; - } break; + } + } else { + + // 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 { + tx[0] = HITAG2_START_AUTH; + *txlen = 5; + } + 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; + Dbprintf("hitag2_crypto: key=0x%x%x uid=0x%x", (uint32_t) ((REV64(ui64key)) >> 32), (uint32_t) ((REV64(ui64key)) & 0xffffffff), REV32(ui32uid)); + 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; + if (write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { + return false; + } + break; + } + } + // stage 2+, got data block + else { + // Store the received block + memcpy(tag.sectors[blocknr], rx, 4); + blocknr++; + } + if (blocknr > 7) { + DbpString("Read successful!"); + bSuccessful = true; + return false; + } else { + tx[0] = HITAG2_READ_PAGE | (blocknr << 3) | ((blocknr ^ 7) >> 2); + tx[1] = ((blocknr ^ 7) << 6); + *txlen = 10; + } + } + } + break; + + // Unexpected response + default: { + Dbprintf("Unknown 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); - } + + 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 +static bool hitag2_authenticate(uint8_t *rx, const size_t rxlen, uint8_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 @@ -640,90 +671,137 @@ bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txl DbpString("Authentication failed!"); return false; } + tx[0] = HITAG2_START_AUTH; *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; - + } + break; + // Received UID, crypto tag answer case 32: { if (!bCrypto) { + memcpy(tx, NrAr, 8); *txlen = 64; - memcpy(tx,NrAr,8); bCrypto = true; } else { - DbpString("Authentication succesful!"); + DbpString("Authentication successful!"); // We are done... for now return false; } - } break; - + } + break; + // Unexpected response default: { - Dbprintf("Uknown frame length: %d",rxlen); + Dbprintf("Unknown frame length: %d",rxlen); return false; - } break; + } + break; } - + return true; } -bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { - // Reset the transmission frame length +static bool hitag2_test_auth_attempts(uint8_t *rx, const size_t rxlen, uint8_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 + // No answer, try to resurrect 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, removed entry!",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; + // 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 + // Return if we reached the end of the authentications table bCrypto = false; if (auth_table_pos == auth_table_len) { return false; } - - // 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); + + // 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); } + tx[0] = HITAG2_START_AUTH; *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; - - // Received UID, crypto tag answer, or read block response + } + break; + + // Received UID, crypto tag answer, or read block response case 32: { if (!bCrypto) { *txlen = 64; - memcpy(tx,NrAr,8); + memcpy(tx, NrAr, 8); bCrypto = true; } else { - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK",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 OK", NrAr[0], NrAr[1], NrAr[2], NrAr[3], NrAr[4], NrAr[5], NrAr[6], NrAr[7]); bCrypto = false; if ((auth_table_pos+8) == auth_table_len) { return false; } auth_table_pos += 8; - memcpy(NrAr,auth_table+auth_table_pos,8); + memcpy(NrAr, auth_table+auth_table_pos, 8); } - } break; - + } + break; + default: { - Dbprintf("Uknown frame length: %d",rxlen); + Dbprintf("Unknown frame length: %d",rxlen); return false; - } break; + } + break; + } + + return true; +} + +static bool hitag2_read_uid(uint8_t *rx, const size_t rxlen, uint8_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 + tx[0] = HITAG2_START_AUTH; + *txlen = 5; + } + 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("Unknown frame length: %d",rxlen); + return false; + } + break; } - return true; } void SnoopHitag(uint32_t type) { - int frame_count; + // int frame_count; int response; int overflow; bool rising_edge; @@ -731,70 +809,72 @@ void SnoopHitag(uint32_t type) { int lastbit; bool bSkip; int tag_sof; - byte_t rx[HITAG_FRAME_LEN]; - size_t rxlen=0; - + uint8_t rx[HITAG_FRAME_LEN] = {0}; + size_t rxlen = 0; + + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + // Clean up trace and prepare it for storing frames - iso14a_set_tracing(TRUE); - iso14a_clear_trace(); + set_tracing(true); + clear_trace(); auth_table_len = 0; auth_table_pos = 0; + + BigBuf_free(); + auth_table = (uint8_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); - + DbpString("Starting Hitag2 snoop"); LED_D_ON(); - + // Set up eavesdropping mode, frequency divisor which will drive the FPGA // and analog mux selection. - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_TOGGLE_MODE); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); - RELAY_OFF(); - + // Configure output pin that is connected to the FPGA (for modulating) AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; // Disable modulation, we are going to eavesdrop, not modulate ;) LOW(GPIO_SSC_DOUT); - + // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the reader frames AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; - - // Disable timer during configuration + + // Disable timer during configuration AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - - // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, + + // TC1: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, // external trigger rising edge, load RA on rising edge of TIOA. - uint32_t t1_channel_mode = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_BOTH | AT91C_TC_ABETRG | AT91C_TC_LDRA_BOTH; - AT91C_BASE_TC1->TC_CMR = t1_channel_mode; - + AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_BOTH | AT91C_TC_ABETRG | AT91C_TC_LDRA_BOTH; + // Enable and reset counter AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - + // Reset the received frame, frame count and timing info - memset(rx,0x00,sizeof(rx)); - frame_count = 0; + // frame_count = 0; response = 0; overflow = 0; reader_frame = false; lastbit = 1; bSkip = true; tag_sof = 4; - - while(!BUTTON_PRESS()) { + + while (!BUTTON_PRESS()) { // Watchdog hit WDT_HIT(); - + // Receive frame, watch for at most T0*EOF periods while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_EOF) { // Check if rising edge in modulation is detected - if(AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { - // Retrieve the new timing values + if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { + // Retrieve the new timing values int ra = (AT91C_BASE_TC1->TC_RA/T0); - + // Find out if we are dealing with a rising or falling edge rising_edge = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME) > 0; @@ -803,35 +883,35 @@ void SnoopHitag(uint32_t type) { // Switch from tag to reader capture LED_C_OFF(); reader_frame = true; - memset(rx,0x00,sizeof(rx)); + memset(rx, 0x00, sizeof(rx)); rxlen = 0; } - + // Only handle if reader frame and rising edge, or tag frame and falling edge if (reader_frame != rising_edge) { - overflow += ra; + overflow += ra; continue; } - + // Add the buffered timing values of earlier captured edges which were skipped ra += overflow; overflow = 0; - + if (reader_frame) { LED_B_ON(); // Capture reader frame - if(ra >= HITAG_T_STOP) { + if (ra >= HITAG_T_STOP) { if (rxlen != 0) { //DbpString("wierd0?"); } // Capture the T0 periods that have passed since last communication or field drop (reset) response = (ra - HITAG_T_LOW); - } else if(ra >= HITAG_T_1_MIN ) { - // '1' bit + } else if (ra >= HITAG_T_1_MIN) { + // '1' bit rx[rxlen / 8] |= 1 << (7-(rxlen%8)); rxlen++; - } else if(ra >= HITAG_T_0_MIN) { - // '0' bit + } else if (ra >= HITAG_T_0_MIN) { + // '0' bit rx[rxlen / 8] |= 0 << (7-(rxlen%8)); rxlen++; } else { @@ -840,31 +920,31 @@ void SnoopHitag(uint32_t type) { } else { LED_C_ON(); // Capture tag frame (manchester decoding using only falling edges) - if(ra >= HITAG_T_EOF) { + if (ra >= HITAG_T_EOF) { if (rxlen != 0) { //DbpString("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) { + response = ra - HITAG_T_TAG_HALF_PERIOD; + } else if (ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { // Manchester coding example |-_|_-|-_| (101) 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) { + } else if (ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { // Manchester coding example |_-|...|_-|-_| (0...01) rx[rxlen / 8] |= 0 << (7-(rxlen%8)); rxlen++; - // We have to skip this half period at start and add the 'one' the second time + // We have to skip this half period at start and add the 'one' the second time if (!bSkip) { rx[rxlen / 8] |= 1 << (7-(rxlen%8)); rxlen++; } lastbit = !lastbit; bSkip = !bSkip; - } else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { + } else if (ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { // Manchester coding example |_-|_-| (00) or |-_|-_| (11) if (tag_sof) { // Ignore bits that are transmitted during SOF @@ -880,11 +960,11 @@ void SnoopHitag(uint32_t type) { } } } - + // Check if frame was captured - if(rxlen > 0) { - frame_count++; - if (!LogTraceHitag(rx,rxlen,response,0,reader_frame)) { + if (rxlen > 0) { + // frame_count++; + if (!LogTraceHitag(rx, rxlen, response, 0, reader_frame)) { DbpString("Trace full"); break; } @@ -897,16 +977,16 @@ void SnoopHitag(uint32_t type) { auth_table_len += 8; } } - + // Reset the received frame and response timing info - memset(rx,0x00,sizeof(rx)); + memset(rx, 0x00, sizeof(rx)); response = 0; reader_frame = false; lastbit = 1; bSkip = true; tag_sof = 4; overflow = 0; - + LED_B_OFF(); LED_C_OFF(); } else { @@ -918,62 +998,67 @@ void SnoopHitag(uint32_t type) { // Reset the timer to restart while-loop that receives frames AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG; } - LED_A_ON(); + LED_A_ON(); LED_B_OFF(); LED_C_OFF(); LED_D_OFF(); AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_A_OFF(); - -// Dbprintf("frame received: %d",frame_count); -// Dbprintf("Authentication Attempts: %d",(auth_table_len/8)); -// DbpString("All done"); + LED_A_OFF(); + +// Dbprintf("frame received: %d",frame_count); +// Dbprintf("Authentication Attempts: %d",(auth_table_len/8)); +// DbpString("All done"); } -void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { - int frame_count; +void SimulateHitagTag(bool tag_mem_supplied, uint8_t *data) { + // int frame_count; int response; int overflow; - byte_t rx[HITAG_FRAME_LEN]; - size_t rxlen=0; - byte_t tx[HITAG_FRAME_LEN]; - size_t txlen=0; + uint8_t rx[HITAG_FRAME_LEN]; + size_t rxlen = 0; + uint8_t tx[HITAG_FRAME_LEN]; + size_t txlen = 0; bool bQuitTraceFull = false; bQuiet = false; - + + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + // Clean up trace and prepare it for storing frames - iso14a_set_tracing(TRUE); - iso14a_clear_trace(); + set_tracing(true); + clear_trace(); + auth_table_len = 0; auth_table_pos = 0; + uint8_t *auth_table; + BigBuf_free(); + auth_table = BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); DbpString("Starting Hitag2 simulation"); LED_D_ON(); hitag2_init(); - + if (tag_mem_supplied) { DbpString("Loading hitag2 memory..."); - memcpy((byte_t*)tag.sectors,data,48); + memcpy((uint8_t*)tag.sectors, data, 48); } uint32_t block = 0; - for (size_t i=0; i<12; i++) { - for (size_t j=0; j<4; j++) { + for (size_t i = 0; i < 12; i++) { + for (size_t j = 0; j < 4; j++) { block <<= 8; block |= tag.sectors[i][j]; } - Dbprintf("| %d | %08x |",i,block); + Dbprintf("| %d | %08x |", i, block); } - + // Set up simulator mode, frequency divisor which will drive the FPGA // and analog mux selection. FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); - RELAY_OFF(); // Configure output pin that is connected to the FPGA (for modulating) AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; @@ -981,60 +1066,64 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { // Disable modulation at default, which means release resistance LOW(GPIO_SSC_DOUT); - + // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); - + // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the reader frames AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; - - // Disable timer during configuration + + // Disable timer during configuration + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, + // TC0: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), no triggers + AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK; + + // TC1: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, // external trigger rising edge, load RA on rising edge of TIOA. AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_RISING | AT91C_TC_ABETRG | AT91C_TC_LDRA_RISING; - - // Enable and reset counter - AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // Reset the received frame, frame count and timing info - memset(rx,0x00,sizeof(rx)); - frame_count = 0; + memset(rx, 0x00, sizeof(rx)); + // frame_count = 0; response = 0; overflow = 0; - - while(!BUTTON_PRESS()) { + + // Enable and reset counter + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + while (!BUTTON_PRESS()) { // Watchdog hit WDT_HIT(); - + // Receive frame, watch for at most T0*EOF periods while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_EOF) { // Check if rising edge in modulation is detected - if(AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { - // Retrieve the new timing values + if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { + // Retrieve the new timing values int ra = (AT91C_BASE_TC1->TC_RA/T0) + overflow; overflow = 0; // Reset timer every frame, we have to capture the last edge for timing AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - + LED_B_ON(); - + // Capture reader frame - if(ra >= HITAG_T_STOP) { + if (ra >= HITAG_T_STOP) { if (rxlen != 0) { //DbpString("wierd0?"); } // Capture the T0 periods that have passed since last communication or field drop (reset) response = (ra - HITAG_T_LOW); - } else if(ra >= HITAG_T_1_MIN ) { - // '1' bit + } else if (ra >= HITAG_T_1_MIN) { + // '1' bit rx[rxlen / 8] |= 1 << (7-(rxlen%8)); rxlen++; - } else if(ra >= HITAG_T_0_MIN) { - // '0' bit + } else if (ra >= HITAG_T_0_MIN) { + // '0' bit rx[rxlen / 8] |= 0 << (7-(rxlen%8)); rxlen++; } else { @@ -1042,12 +1131,12 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { } } } - + // Check if frame was captured - if(rxlen > 4) { - frame_count++; + if (rxlen > 4) { + // frame_count++; if (!bQuiet) { - if (!LogTraceHitag(rx,rxlen,response,0,true)) { + if (!LogTraceHitag(rx, rxlen, response, 0, true)) { DbpString("Trace full"); if (bQuitTraceFull) { break; @@ -1056,27 +1145,27 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { } } } - + // Disable timer 1 with external trigger to avoid triggers during our own modulation AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // Process the incoming frame (rx) and prepare the outgoing frame (tx) - hitag2_handle_reader_command(rx,rxlen,tx,&txlen); - + hitag2_handle_reader_command(rx, rxlen, tx, &txlen); + // Wait for HITAG_T_WAIT_1 carrier periods after the last reader bit, // not that since the clock counts since the rising edge, but T_Wait1 is // with respect to the falling edge, we need to wait actually (T_Wait1 - T_Low) - // periods. The gap time T_Low varies (4..10). All timer values are in + // periods. The gap time T_Low varies (4..10). All timer values are in // terms of T0 units - while(AT91C_BASE_TC0->TC_CV < T0*(HITAG_T_WAIT_1-HITAG_T_LOW)); + while (AT91C_BASE_TC0->TC_CV < T0*(HITAG_T_WAIT_1-HITAG_T_LOW)); // Send and store the tag answer (if there is any) if (txlen) { // Transmit the tag frame - hitag_send_frame(tx,txlen); + hitag_send_frame(tx, txlen); // Store the frame in the trace if (!bQuiet) { - if (!LogTraceHitag(tx,txlen,0,0,false)) { + if (!LogTraceHitag(tx, txlen, 0, 0, false)) { DbpString("Trace full"); if (bQuitTraceFull) { break; @@ -1086,11 +1175,11 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { } } } - + // Reset the received frame and response timing info - memset(rx,0x00,sizeof(rx)); + memset(rx, 0x00, sizeof(rx)); response = 0; - + // Enable and reset external trigger in timer for capturing future frames AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; LED_B_OFF(); @@ -1107,157 +1196,173 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { 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); -// Dbprintf("Authentication Attempts: %d",(auth_table_len/8)); -// DbpString("All done"); + + DbpString("Sim Stopped"); + } -void ReaderHitag(hitag_function htf, hitag_data* htd) { - int frame_count; +void ReaderHitag(hitag_function htf, hitag_data *htd) { + // int frame_count; int response; - byte_t rx[HITAG_FRAME_LEN]; - size_t rxlen=0; - byte_t txbuf[HITAG_FRAME_LEN]; - byte_t* tx = txbuf; - size_t txlen=0; + uint8_t rx[HITAG_FRAME_LEN]; + size_t rxlen = 0; + uint8_t txbuf[HITAG_FRAME_LEN]; + uint8_t *tx = txbuf; + size_t txlen = 0; int lastbit; bool bSkip; - int reset_sof; + int reset_sof; int tag_sof; int t_wait = HITAG_T_WAIT_MAX; - bool bStop; + bool bStop = false; bool bQuitTraceFull = false; - - // Reset the return status - bSuccessful = 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(); - DbpString("Starting Hitag reader family"); + set_tracing(true); + clear_trace(); + + //DbpString("Starting Hitag reader family"); // Check configuration - switch(htf) { + switch (htf) { case RHT2F_PASSWORD: { - Dbprintf("List identifier in password mode"); - memcpy(password,htd->pwd.password,4); - blocknr = 0; + Dbprintf("List identifier in password mode"); + memcpy(password, htd->pwd.password, 4); + blocknr = 0; bQuitTraceFull = false; bQuiet = false; bPwd = false; - } break; - + bAuthenticating = false; + } + break; case RHT2F_AUTHENTICATE: { DbpString("Authenticating using nr,ar pair:"); - memcpy(NrAr,htd->auth.NrAr,8); - Dbhexdump(8,NrAr,false); + memcpy(NrAr, htd->auth.NrAr, 8); + Dbhexdump(8, NrAr, false); bQuiet = false; bCrypto = false; - bAuthenticating = false; + bAuthenticating = false; bQuitTraceFull = true; - } break; - - case RHT2F_CRYPTO: { + } + break; + case RHT2F_CRYPTO: + { DbpString("Authenticating using key:"); - memcpy(key,htd->crypto.key,6); - Dbhexdump(6,key,false); - blocknr = 0; + memcpy(key, htd->crypto.key, 6); //HACK; 4 or 6?? I read both in the code. + Dbhexdump(6, key, false); + blocknr = 0; bQuiet = false; bCrypto = false; - bAuthenticating = false; + bAuthenticating = false; bQuitTraceFull = true; - } break; - + } + break; case RHT2F_TEST_AUTH_ATTEMPTS: { - Dbprintf("Testing %d authentication attempts",(auth_table_len/8)); + Dbprintf("Testing %d authentication attempts", (auth_table_len/8)); auth_table_pos = 0; - memcpy(NrAr,auth_table,8); + memcpy(NrAr, auth_table, 8); bQuitTraceFull = false; bQuiet = false; bCrypto = false; - } break; - + } + break; + case RHT2F_UID_ONLY: { + blocknr = 0; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + } + break; default: { - Dbprintf("Error, unknown function: %d",htf); + Dbprintf("Error, unknown function: %d", htf); return; - } break; + } + break; } - + LED_D_ON(); hitag2_init(); - + // Configure output and enable pin that is connected to the FPGA (for modulating) AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; - + // Set fpga in edge detect with reader field, we can modulate as reader now FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); // Set Frequency divisor which will drive the FPGA and analog mux selection FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); - RELAY_OFF(); // Disable modulation at default, which means enable the field LOW(GPIO_SSC_DOUT); - // Give it a bit of time for the resonant antenna to settle. - SpinDelay(30); - // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; - - // Disable timer during configuration + + // Disable timer during configuration + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - - // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, + + // TC0: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), no triggers + AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK; + + // TC1: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, // external trigger rising edge, load RA on falling edge of TIOA. AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | AT91C_TC_LDRA_FALLING; - + // Enable and reset counters AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // Reset the received frame, frame count and timing info - frame_count = 0; + // frame_count = 0; response = 0; 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; - } - - while(!bStop && !BUTTON_PRESS()) { - // Watchdog hit + Dbprintf("Error, unknown hitag reader type: %d", htf); + goto out; + } + + // wait for tag to power up + // t_PowerUp = 312,5 carrier periods + while (AT91C_BASE_TC0->TC_CV < T0*(312-t_wait)); + + uint8_t attempt_count = 0; + while (!bStop && !BUTTON_PRESS()) { WDT_HIT(); - + // Check if frame was captured and store it - if(rxlen > 0) { - frame_count++; + 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) { break; @@ -1267,51 +1372,64 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { } } } - + // By default reset the transmission buffer tx = txbuf; - switch(htf) { + switch (htf) { case RHT2F_PASSWORD: { - bStop = !hitag2_password(rx,rxlen,tx,&txlen); - } break; + bStop = !hitag2_password(rx, rxlen, tx, &txlen, false); + } + break; case RHT2F_AUTHENTICATE: { - bStop = !hitag2_authenticate(rx,rxlen,tx,&txlen); - } break; + bStop = !hitag2_authenticate(rx, rxlen, tx, &txlen); + } + break; case RHT2F_CRYPTO: { - bStop = !hitag2_crypto(rx,rxlen,tx,&txlen); - } break; + bStop = !hitag2_crypto(rx, rxlen, tx, &txlen, false); + } + break; case RHT2F_TEST_AUTH_ATTEMPTS: { - bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen); - } break; + 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; - } break; + Dbprintf("Error, unknown function: %d", htf); + goto out; + } } - + // Send and store the reader command // Disable timer 1 with external trigger to avoid triggers during our own modulation AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - + // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, // Since the clock counts since the last falling edge, a 'one' means that the // falling edge occured halfway the period. with respect to this falling edge, // 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))); - + 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); + hitag_reader_send_frame(tx, txlen); // Enable and reset external trigger in timer for capturing future frames AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // Add transmitted frame to total count - if(txlen > 0) { - frame_count++; + if (txlen > 0) { + // frame_count++; if (!bQuiet) { // Store the frame in the trace - if (!LogTraceHitag(tx,txlen,HITAG_T_WAIT_2,0,true)) { + if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) { if (bQuitTraceFull) { break; } else { @@ -1320,54 +1438,71 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { } } } - + // Reset values for receiving frames - memset(rx,0x00,sizeof(rx)); + memset(rx, 0x00, sizeof(rx)); rxlen = 0; lastbit = 1; 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 - if(AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { - // Retrieve the new timing values + if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { + // Retrieve the new timing values int ra = (AT91C_BASE_TC1->TC_RA/T0); - + // Reset timer every frame, we have to capture the last edge for timing AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; - + LED_B_ON(); - + // Capture tag frame (manchester decoding using only falling edges) - if(ra >= HITAG_T_EOF) { + 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) { + 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) { + } 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 + // We have to skip this half period at start and add the 'one' the second time if (!bSkip) { rx[rxlen / 8] |= 1 << (7-(rxlen%8)); rxlen++; } lastbit = !lastbit; bSkip = !bSkip; - } else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { + } 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--; @@ -1377,22 +1512,334 @@ 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; + } + } + } + +out: + //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"); + if (bSuccessful) + cmd_send(CMD_ACK, bSuccessful, 0, 0, (uint8_t*)tag.sectors, 48); + else + cmd_send(CMD_ACK, bSuccessful, 0, 0, 0, 0); +} + +void WriterHitag(hitag_function htf, hitag_data *htd, int page) { + // int frame_count; + int response; + uint8_t rx[HITAG_FRAME_LEN]; + size_t rxlen = 0; + uint8_t txbuf[HITAG_FRAME_LEN]; + uint8_t *tx = txbuf; + size_t txlen = 0; + int lastbit; + bool bSkip; + int reset_sof; + int tag_sof; + 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 + set_tracing(true); + clear_trace(); + + //DbpString("Starting Hitag reader family"); + + // Check configuration + switch (htf) { + case WHT2F_CRYPTO: { + DbpString("Authenticating using key:"); + memcpy(key, htd->crypto.key, 6); //HACK; 4 or 6?? I read both in the code. + memcpy(writedata, htd->crypto.data, 4); + Dbhexdump(6, key, false); + blocknr = page; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + writestate = WRITE_STATE_START; + } + break; + case WHT2F_PASSWORD: { + DbpString("Authenticating using password:"); + memcpy(password, htd->pwd.password, 4); + memcpy(writedata, htd->crypto.data, 4); + Dbhexdump(4, password, false); + blocknr = page; + bPwd = false; + bAuthenticating = false; + writestate = WRITE_STATE_START; + } + break; + default: { + Dbprintf("Error, unknown function: %d", htf); + return; + } + break; + } + + LED_D_ON(); + hitag2_init(); + + // Configure output and enable pin that is connected to the FPGA (for modulating) + AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; + + // Set fpga in edge detect with reader field, we can modulate as reader now + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); + + // Set Frequency divisor which will drive the FPGA and analog mux selection + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz + SetAdcMuxFor(GPIO_MUXSEL_LOPKD); + + // Disable modulation at default, which means enable the field + LOW(GPIO_SSC_DOUT); + + // Give it a bit of time for the resonant antenna to settle. + SpinDelay(30); + + // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); + + // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); + AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; + + // Disable timer during configuration + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + + // TC0: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), no triggers + AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK; + + // TC1: Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, + // external trigger rising edge, load RA on falling edge of TIOA. + AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | AT91C_TC_LDRA_FALLING; + + // Enable and reset counters + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + // Reset the received frame, frame count and timing info + // frame_count = 0; + response = 0; + 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"); + } else { + Dbprintf("Error, unknown hitag reader type: %d", htf); + return; + } + while (!bStop && !BUTTON_PRESS()) { + + WDT_HIT(); + + // Check if frame was captured and store it + if (rxlen > 0) { + // frame_count++; + if (!bQuiet) { + if (!LogTraceHitag(rx, rxlen, response, 0, false)) { + DbpString("Trace full"); + if (bQuitTraceFull) { + break; + } else { + bQuiet = true; + } + } + } + } + // By default reset the transmission buffer + tx = txbuf; + switch (htf) { + case WHT2F_CRYPTO: { + bStop = !hitag2_crypto(rx, rxlen, tx, &txlen, true); + } + break; + case WHT2F_PASSWORD: { + bStop = !hitag2_password(rx, rxlen, tx, &txlen, true); + } + break; + default: { + Dbprintf("Error, unknown function: %d", htf); + return; + } + break; + } + + // Send and store the reader command + // Disable timer 1 with external trigger to avoid triggers during our own modulation + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + + // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, + // Since the clock counts since the last falling edge, a 'one' means that the + // falling edge occured halfway the period. with respect to this falling edge, + // 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); + + // Enable and reset external trigger in timer for capturing future frames + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + // Add transmitted frame to total count + if (txlen > 0) { + // frame_count++; + if (!bQuiet) { + // Store the frame in the trace + if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) { + if (bQuitTraceFull) { + break; + } else { + bQuiet = true; + } + } + } + } + + // Reset values for receiving frames + memset(rx, 0x00, sizeof(rx)); + rxlen = 0; + lastbit = 1; + 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 + if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { + // Retrieve the new timing values + int ra = (AT91C_BASE_TC1->TC_RA/T0); + + // Reset timer every frame, we have to capture the last edge for timing + AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; + + LED_B_ON(); + + // Capture tag frame (manchester decoding using only falling edges) + if (ra >= HITAG_T_EOF) { + if (rxlen != 0) { + //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 + if (!bSkip) { + rx[rxlen / 8] |= 1 << (7-(rxlen%8)); + rxlen++; + } + lastbit = !lastbit; + 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--; + } else { + // bit is same as last bit + rx[rxlen / 8] |= lastbit << (7-(rxlen%8)); + rxlen++; + } + } else { + // Dbprintf("DEBUG: Wierd2"); + errorCount++; + // Ignore wierd value, it is too 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; + if (rxlen > 0) break; } } + + // Wait some extra time for flash to be programmed + if ((rxlen == 0) && (writestate == WRITE_STATE_PROG)) { + AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; + while (AT91C_BASE_TC0->TC_CV < T0*(HITAG_T_PROG - HITAG_T_WAIT_MAX)); + } } + //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, (uint8_t*)tag.sectors, 48); }