// (c) 2012 Roel Verdult
//-----------------------------------------------------------------------------
+#include "hitag2.h"
+
#include "proxmark3.h"
+#include "usb_cdc.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;
+
+
struct hitag2_tag {
uint32_t uid;
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;
+// 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;
-byte_t password[4];
-byte_t NrAr[8];
-byte_t key[8];
-uint64_t cipher_state;
+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.
// 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;
}
-size_t nbytes(size_t nbits) {
- return (nbits/8)+((nbits%8)>0);
-}
-
-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);
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<bytes; i++) data[i] ^= _hitag2_byte(cs);
- for(i=0; i<bits; i++) data[bytes] ^= _hitag2_round(cs) << (7-i);
+ for (i = 0; i < bytes; i++) data[i] ^= _hitag2_byte(cs);
+ for (i = 0; i < bits; i++) data[bytes] ^= _hitag2_round(cs) << (7-i);
return 0;
}
// T0 = TIMER_CLOCK1 / 125000 = 192
#define T0 192
-#define SHORT_COIL() LOW(GPIO_SSC_DOUT)
-#define OPEN_COIL() HIGH(GPIO_SSC_DOUT)
-
-#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_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_HALF_PERIOD 16
-#define HITAG_T_TAG_FULL_PERIOD 32
+#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_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<frame_len; i++) {
- hitag_send_bit((frame[i/8] >> (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;
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.
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;
}
-// LogTrace(rx,nbytes(rxlen),0,0,false);
-// LogTrace(tx,nbytes(*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<frame_len; i++) {
- hitag_reader_send_bit((frame[i/8] >> (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);
}
-
- blocknr++;
- if (blocknr > 7) {
- DbpString("Read succesful!");
- bSuccessful = true;
- return false;
+ 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;
}
- *txlen = 10;
- tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
- tx[1] = ((blocknr^7) << 6);
+ 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;
+ }
}
- } break;
-
- // Unexpected response
- default: {
- Dbprintf("Uknown frame length: %d",rxlen);
- return false;
- } break;
+ break;
+
+ // Unexpected response
+ default: {
+ Dbprintf("Unknown 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) {
+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) {
- DbpString("Authentication failed!");
- return false;
+ if (bCrypto && !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 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;
}
- *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);
+ // 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("Uknown frame length: %d",rxlen);
- return false;
- } break;
+ 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
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!",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 authentications table
bCrypto = false;
- if ((auth_table_pos+8) == auth_table_len) {
+ if (auth_table_pos == auth_table_len) {
return false;
}
- auth_table_pos += 8;
- 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;
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;
// 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 {
} 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
}
}
}
-
+
// Check if frame was captured
- if(rxlen > 0) {
- frame_count++;
- if (!LogTrace(rx,nbytes(rxlen),response,0,reader_frame)) {
+ if (rxlen > 0) {
+ // frame_count++;
+ if (!LogTraceHitag(rx, rxlen, response, 0, reader_frame)) {
DbpString("Trace full");
break;
}
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 {
// 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;
// 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 {
}
}
}
-
+
// Check if frame was captured
- if(rxlen > 4) {
- frame_count++;
+ 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;
}
}
}
-
+
// 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 (!LogTrace(tx,nbytes(txlen),0,0,false)) {
+ if (!LogTraceHitag(tx, txlen, 0, 0, false)) {
DbpString("Trace full");
if (bQuitTraceFull) {
break;
}
}
}
-
+
// 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();
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 (!LogTrace(rx,nbytes(rxlen),response,0,false)) {
+ if (!LogTraceHitag(rx, rxlen, response, 0, false)) {
DbpString("Trace full");
if (bQuitTraceFull) {
break;
}
}
}
-
+
// 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 (!LogTrace(tx,nbytes(txlen),HITAG_T_WAIT_2,0,true)) {
+ if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) {
if (bQuitTraceFull) {
break;
} else {
}
}
}
-
+
// 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--;
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);
}
projects / proxmark3-svn / blobdiff