#include "util.h"
#include "hitag2.h"
#include "string.h"
+#include "BigBuf.h"
static bool bQuiet;
-bool bCrypto;
-bool bPwd;
+static bool bCrypto;
+static bool bAuthenticating;
+static bool bPwd;
+static bool bSuccessful;
+
+
struct hitag2_tag {
uint32_t uid;
byte_t sectors[12][4];
};
-static struct hitag2_tag tag;
-static const struct hitag2_tag resetdata = {
+static struct hitag2_tag tag = {
.state = TAG_STATE_RESET,
.sectors = { // Password mode: | Crypto mode:
[0] = { 0x02, 0x4e, 0x02, 0x20}, // UID | UID
},
};
-//#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 byte_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];
+static byte_t password[4];
+static byte_t NrAr[8];
+static byte_t key[8];
+static byte_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.
static u32 _f20 (const u64 x)
{
- u32 i5;
-
+ u32 i5;
+
i5 = ((ht2_f4a >> i4 (x, 1, 2, 4, 5)) & 1)* 1
- + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2
- + ((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;
+ + ((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;
}
u64 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 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)
+static int hitag2_init(void)
{
- memcpy(&tag, &resetdata, sizeof(tag));
+// memcpy(&tag, &resetdata, sizeof(tag));
hitag2_reset();
return 0;
}
static void hitag2_cipher_reset(struct hitag2_tag *tag, const byte_t *iv)
{
- uint64_t key = ((uint64_t)tag->sectors[2][2]) |
- ((uint64_t)tag->sectors[2][3] << 8) |
- ((uint64_t)tag->sectors[1][0] << 16) |
- ((uint64_t)tag->sectors[1][1] << 24) |
- ((uint64_t)tag->sectors[1][2] << 32) |
- ((uint64_t)tag->sectors[1][3] << 40);
- uint32_t uid = ((uint32_t)tag->sectors[0][0]) |
- ((uint32_t)tag->sectors[0][1] << 8) |
- ((uint32_t)tag->sectors[0][2] << 16) |
- ((uint32_t)tag->sectors[0][3] << 24);
+ uint64_t key = ((uint64_t)tag->sectors[2][2]) |
+ ((uint64_t)tag->sectors[2][3] << 8) |
+ ((uint64_t)tag->sectors[1][0] << 16) |
+ ((uint64_t)tag->sectors[1][1] << 24) |
+ ((uint64_t)tag->sectors[1][2] << 32) |
+ ((uint64_t)tag->sectors[1][3] << 40);
+ uint32_t uid = ((uint32_t)tag->sectors[0][0]) |
+ ((uint32_t)tag->sectors[0][1] << 8) |
+ ((uint32_t)tag->sectors[0][2] << 16) |
+ ((uint32_t)tag->sectors[0][3] << 24);
uint32_t iv_ = (((uint32_t)(iv[0]))) |
- (((uint32_t)(iv[1])) << 8) |
- (((uint32_t)(iv[2])) << 16) |
- (((uint32_t)(iv[3])) << 24);
+ (((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_));
}
#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
LOW(GPIO_SSC_DOUT);
}
-void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
+
+static 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];
// 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
- case 05: {
- // Always send over the air in the clear plaintext mode
- if(rx_air[0] != 0xC0) {
- // Unknown frame ?
- return;
- }
- *txlen = 32;
- memcpy(tx,tag.sectors[0],4);
- tag.crypto_active = 0;
+ case 05: {
+ // Always send over the air in the clear plaintext mode
+ if(rx_air[0] != 0xC0) {
+ // Unknown frame ?
+ return;
}
+ *txlen = 32;
+ 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
- case 10: {
- unsigned int sector = (~( ((rx[0]<<2)&0x04) | ((rx[1]>>6)&0x03) ) & 0x07);
- // Verify complement of sector index
- if(sector != ((rx[0]>>3)&0x07)) {
- //DbpString("Transmission error (read/write)");
- return;
- }
+ case 10: {
+ unsigned int sector = (~( ((rx[0]<<2)&0x04) | ((rx[1]>>6)&0x03) ) & 0x07);
+ // Verify complement of sector index
+ 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);
- *txlen = 32;
- break;
+ switch (rx[0] & 0xC6) {
+ // Read command: 11xx x00y
+ case 0xC0:
+ memcpy(tx,tag.sectors[sector],4);
+ *txlen = 32;
+ break;
- // Inverted Read command: 01xx x10y
- case 0x44:
- for (size_t i=0; i<4; i++) {
- tx[i] = tag.sectors[sector][i] ^ 0xff;
- }
- *txlen = 32;
- break;
-
- // Write command: 10xx x01y
- case 0x82:
- // Prepare write, acknowledge by repeating command
- memcpy(tx,rx,nbytes(rxlen));
- *txlen = rxlen;
- tag.active_sector = sector;
- tag.state=TAG_STATE_WRITING;
- break;
-
- // Unknown command
- default:
- Dbprintf("Uknown command: %02x %02x",rx[0],rx[1]);
- return;
- break;
+ // Inverted Read command: 01xx x10y
+ case 0x44:
+ for (size_t i=0; i<4; i++) {
+ tx[i] = tag.sectors[sector][i] ^ 0xff;
}
+ *txlen = 32;
+ break;
+
+ // Write command: 10xx x01y
+ case 0x82:
+ // Prepare write, acknowledge by repeating command
+ memcpy(tx,rx,nbytes(rxlen));
+ *txlen = rxlen;
+ tag.active_sector = sector;
+ tag.state=TAG_STATE_WRITING;
+ break;
+
+ // Unknown command
+ default:
+ Dbprintf("Unknown command: %02x %02x",rx[0],rx[1]);
+ return;
+ break;
}
+ }
break;
// Writing data or Reader password
- case 32: {
- 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;
+ case 32: {
+ 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;
+ return;
+ } else {
+ // Received RWD password, respond with configuration and our password
+ if(memcmp(rx,tag.sectors[1],4) != 0) {
+ DbpString("Reader password is wrong");
return;
- } else {
- // Received RWD password, respond with configuration and our password
- if(memcmp(rx,tag.sectors[1],4) != 0) {
- DbpString("Reader password is wrong");
- return;
- }
- *txlen = 32;
- memcpy(tx,tag.sectors[3],4);
}
+ *txlen = 32;
+ memcpy(tx,tag.sectors[3],4);
}
+ }
break;
// Received RWD authentication challenge and respnse
- case 64: {
- // Store the authentication attempt
- if (auth_table_len < (AUTH_TABLE_LENGTH-8)) {
- memcpy(auth_table+auth_table_len,rx,8);
- auth_table_len += 8;
- }
+ case 64: {
+ // Store the authentication attempt
+ if (auth_table_len < (AUTH_TABLE_LENGTH-8)) {
+ memcpy(auth_table+auth_table_len,rx,8);
+ auth_table_len += 8;
+ }
- // Reset the cipher state
- hitag2_cipher_reset(&tag,rx);
- // Check if the authentication was correct
- 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]);
- return;
- }
- // Succesful, but commented out reporting back to the Host, this may delay to much.
- // Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]);
+ // Reset the cipher state
+ hitag2_cipher_reset(&tag,rx);
+ // Check if the authentication was correct
+ 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]);
+ return;
+ }
+ // Succesful, but commented out reporting back to the Host, this may delay to much.
+ // Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]);
- // Activate encryption algorithm for all further communication
- tag.crypto_active = 1;
+ // Activate encryption algorithm for all further communication
+ tag.crypto_active = 1;
- // Use the tag password as response
- memcpy(tx,tag.sectors[3],4);
- *txlen = 32;
- }
+ // Use the tag password as response
+ memcpy(tx,tag.sectors[3],4);
+ *txlen = 32;
+ }
break;
}
-// LogTrace(rx,nbytes(rxlen),0,0,false);
-// LogTrace(tx,nbytes(*txlen),0,0,true);
+// LogTraceHitag(rx,rxlen,0,0,false);
+// LogTraceHitag(tx,*txlen,0,0,true);
if(tag.crypto_active) {
hitag2_cipher_transcrypt(&(tag.cs), tx, *txlen/8, *txlen%8);
// 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
LED_A_OFF();
}
+
static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len)
{
// Send the content of the frame
}
// 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);
LOW(GPIO_SSC_DOUT);
}
-bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+size_t blocknr;
+
+static 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!");
- return false;
- }
- *txlen = 5;
- memcpy(tx,"\xc0",nbytes(*txlen));
- } break;
+ case 0: {
+ // Stop if there is no answer (after sending password)
+ if (bPwd) {
+ DbpString("Password failed!");
+ 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;
- } else {
- DbpString("Password succesful!");
- // We are done... for now
+ case 32: {
+ if (!bPwd) {
+ *txlen = 32;
+ memcpy(tx,password,4);
+ bPwd = true;
+ memcpy(tag.sectors[blocknr],rx,4);
+ blocknr++;
+ } else {
+
+ if(blocknr == 1){
+ //store password in block1, the TAG answers with Block3, but we need the password in memory
+ memcpy(tag.sectors[blocknr],tx,4);
+ }else{
+ memcpy(tag.sectors[blocknr],rx,4);
+ }
+
+ blocknr++;
+ if (blocknr > 7) {
+ DbpString("Read succesful!");
+ bSuccessful = true;
return false;
}
- } break;
+ *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);
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
+ }
+ return true;
+}
+
+static bool hitag2_write_page(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
+{
+ switch (writestate) {
+ case WRITE_STATE_START:
+ *txlen = 10;
+ tx[0] = 0x82 | (blocknr << 3) | ((blocknr^7) >> 2);
+ tx[1] = ((blocknr^7) << 6);
+ writestate = WRITE_STATE_PAGENUM_WRITTEN;
+ break;
+ case WRITE_STATE_PAGENUM_WRITTEN:
+ // Check if page number was received correctly
+ if ((rxlen == 10) &&
+ (rx[0] == (0x82 | (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;
- } break;
+ }
+ break;
+ case WRITE_STATE_PROG:
+ if (rxlen == 0) {
+ bSuccessful = true;
+ } else {
+ 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;
}
-bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
- // Reset the transmission frame length
+static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_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 && !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) {
+ 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) {
- *txlen = 64;
- memcpy(tx,NrAr,8);
- bCrypto = true;
+ }
+ 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;
+ }
} else {
- DbpString("Authentication succesful!");
- // We are done... for now
+ // Store the received block
+ memcpy(tag.sectors[blocknr],rx,4);
+ blocknr++;
+ }
+
+ if (blocknr > 7) {
+ DbpString("Read succesful!");
+ bSuccessful = true;
return false;
+ } else {
+ *txlen = 10;
+ tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
+ tx[1] = ((blocknr^7) << 6);
}
- } break;
+ }
+ } break;
// Unexpected response
- default: {
- Dbprintf("Uknown frame length: %d",rxlen);
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
+ }
+ }
+
+ if(bCrypto) {
+ // We have to return now to avoid double encryption
+ if (!bAuthenticating) {
+ hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8);
+ }
+ }
+
+ return true;
+}
+
+
+static bool hitag2_authenticate(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 while we are in crypto mode (after sending NrAr)
+ if (bCrypto) {
+ DbpString("Authentication failed!");
return false;
- } break;
+ }
+ *txlen = 5;
+ memcpy(tx,"\xc0",nbytes(*txlen));
+ } break;
+
+ // Received UID, crypto tag answer
+ case 32: {
+ if (!bCrypto) {
+ *txlen = 64;
+ memcpy(tx,NrAr,8);
+ bCrypto = true;
+ } else {
+ DbpString("Authentication succesful!");
+ // We are done... for now
+ return false;
+ }
+ } break;
+
+ // Unexpected response
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
}
return true;
}
-bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+
+static bool hitag2_test_auth_attempts(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 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]);
- bCrypto = false;
- if ((auth_table_pos+8) == auth_table_len) {
- return false;
- }
- auth_table_pos += 8;
- memcpy(NrAr,auth_table+auth_table_pos,8);
+ // 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]);
+
+ // 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 == auth_table_len) {
+ return false;
}
- *txlen = 5;
- memcpy(tx,"\xc0",nbytes(*txlen));
- } break;
+
+ // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry)
+ memcpy(NrAr,auth_table+auth_table_pos,8);
+ }
+ *txlen = 5;
+ memcpy(tx,"\xc0",nbytes(*txlen));
+ } break;
- // Received UID, crypto tag answer, or read block response
- case 32: {
- if (!bCrypto) {
- *txlen = 64;
- 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]);
- bCrypto = false;
- if ((auth_table_pos+8) == auth_table_len) {
- return false;
- }
- auth_table_pos += 8;
- memcpy(NrAr,auth_table+auth_table_pos,8);
+ // Received UID, crypto tag answer, or read block response
+ case 32: {
+ if (!bCrypto) {
+ *txlen = 64;
+ 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]);
+ bCrypto = false;
+ if ((auth_table_pos+8) == auth_table_len) {
+ return false;
}
- } break;
+ auth_table_pos += 8;
+ memcpy(NrAr,auth_table+auth_table_pos,8);
+ }
+ } break;
- default: {
- Dbprintf("Uknown frame length: %d",rxlen);
- return false;
- } break;
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
}
return true;
}
+static bool hitag2_read_uid(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+ // Reset the transmission frame length
+ *txlen = 0;
+
+ // Try to find out which command was send by selecting on length (in bits)
+ switch (rxlen) {
+ // No answer, try to resurrect
+ case 0: {
+ // Just starting or if there is no answer
+ *txlen = 5;
+ memcpy(tx,"\xc0",nbytes(*txlen));
+ } break;
+ // Received UID
+ case 32: {
+ // Check if we received answer tag (at)
+ if (bAuthenticating) {
+ bAuthenticating = false;
+ } else {
+ // Store the received block
+ memcpy(tag.sectors[blocknr],rx,4);
+ blocknr++;
+ }
+ if (blocknr > 0) {
+ //DbpString("Read successful!");
+ bSuccessful = true;
+ return false;
+ }
+ } break;
+ // Unexpected response
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
+ }
+ return true;
+}
+
void SnoopHitag(uint32_t type) {
int frame_count;
int response;
int lastbit;
bool bSkip;
int tag_sof;
- byte_t rx[HITAG_FRAME_LEN];
+ byte_t rx[HITAG_FRAME_LEN] = {0};
size_t rxlen=0;
- // Clean up trace and prepare it for storing frames
- iso14a_set_tracing(TRUE);
- iso14a_clear_trace();
+ FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+ // Clean up trace and prepare it for storing frames
+ set_tracing(true);
+ clear_trace();
+
auth_table_len = 0;
auth_table_pos = 0;
+
+ BigBuf_free();
+ auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH);
memset(auth_table, 0x00, AUTH_TABLE_LENGTH);
-
+
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();
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,
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;
response = 0;
overflow = 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;
}
// Check if frame was captured
if(rxlen > 0) {
frame_count++;
- if (!LogTrace(rx,nbytes(rxlen),response,0,reader_frame)) {
+ if (!LogTraceHitag(rx,rxlen,response,0,reader_frame)) {
DbpString("Trace full");
break;
}
// 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();
+ LED_A_OFF();
// Dbprintf("frame received: %d",frame_count);
// Dbprintf("Authentication Attempts: %d",(auth_table_len/8));
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;
+ byte_t* auth_table;
+ BigBuf_free();
+ auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH);
memset(auth_table, 0x00, AUTH_TABLE_LENGTH);
DbpString("Starting Hitag2 simulation");
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,
+ // 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;
response = 0;
overflow = 0;
+
+ // Enable and reset counter
+ AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
while(!BUTTON_PRESS()) {
// Watchdog hit
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;
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;
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 reset_sof;
int tag_sof;
int t_wait = HITAG_T_WAIT_MAX;
- bool bStop;
+ bool bStop = false;
bool bQuitTraceFull = false;
-
+
+ FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+ // Reset the return status
+ bSuccessful = false;
+
// Clean up trace and prepare it for storing frames
- iso14a_set_tracing(TRUE);
- iso14a_clear_trace();
- DbpString("Starting Hitag reader family");
+ set_tracing(true);
+ clear_trace();
+
+ //DbpString("Starting Hitag reader family");
// Check configuration
switch(htf) {
- case RHT2F_PASSWORD: {
- Dbprintf("List identifier in password mode");
- memcpy(password,htd->pwd.password,4);
- bQuitTraceFull = false;
- bQuiet = false;
- bPwd = false;
- } break;
- case RHT2F_AUTHENTICATE: {
- DbpString("Authenticating in crypto mode");
- memcpy(NrAr,htd->auth.NrAr,8);
- Dbprintf("Reader-challenge:");
- Dbhexdump(8,NrAr,false);
- bQuiet = false;
- bCrypto = false;
- bQuitTraceFull = true;
- } break;
-
- case RHT2F_TEST_AUTH_ATTEMPTS: {
- Dbprintf("Testing %d authentication attempts",(auth_table_len/8));
- auth_table_pos = 0;
- memcpy(NrAr,auth_table,8);
- bQuitTraceFull = false;
- bQuiet = false;
- bCrypto = false;
- } break;
-
- default: {
- Dbprintf("Error, unknown function: %d",htf);
- return;
- } break;
+ case RHT2F_PASSWORD: {
+ Dbprintf("List identifier in password mode");
+ memcpy(password,htd->pwd.password,4);
+ blocknr = 0;
+ bQuitTraceFull = false;
+ bQuiet = false;
+ bPwd = false;
+ } break;
+ case RHT2F_AUTHENTICATE: {
+ DbpString("Authenticating using nr,ar pair:");
+ memcpy(NrAr,htd->auth.NrAr,8);
+ Dbhexdump(8,NrAr,false);
+ bQuiet = false;
+ bCrypto = false;
+ bAuthenticating = false;
+ bQuitTraceFull = true;
+ } break;
+ case RHT2F_CRYPTO:
+ {
+ DbpString("Authenticating using key:");
+ memcpy(key,htd->crypto.key,6); //HACK; 4 or 6?? I read both in the code.
+ Dbhexdump(6,key,false);
+ blocknr = 0;
+ bQuiet = false;
+ bCrypto = false;
+ bAuthenticating = false;
+ bQuitTraceFull = true;
+ } break;
+ case RHT2F_TEST_AUTH_ATTEMPTS: {
+ Dbprintf("Testing %d authentication attempts",(auth_table_len/8));
+ auth_table_pos = 0;
+ memcpy(NrAr, auth_table, 8);
+ bQuitTraceFull = false;
+ bQuiet = false;
+ bCrypto = false;
+ } break;
+ case RHT2F_UID_ONLY: {
+ blocknr = 0;
+ bQuiet = false;
+ bCrypto = false;
+ bAuthenticating = false;
+ bQuitTraceFull = true;
+ } break;
+ default: {
+ Dbprintf("Error, unknown function: %d",htf);
+ return;
+ } break;
}
LED_D_ON();
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,
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");
+ //DbpString("Configured for hitagS reader");
} else if (htf < 20) {
// hitag1 settings
reset_sof = 1;
t_wait = 200;
- DbpString("Configured for hitag1 reader");
+ //DbpString("Configured for hitag1 reader");
} else if (htf < 30) {
// hitag2 settings
reset_sof = 4;
t_wait = HITAG_T_WAIT_2;
- DbpString("Configured for hitag2 reader");
+ //DbpString("Configured for hitag2 reader");
} else {
- Dbprintf("Error, unknown hitag reader type: %d",htf);
- return;
- }
-
+ Dbprintf("Error, unknown hitag reader type: %d",htf);
+ return;
+ }
+ uint8_t attempt_count=0;
while(!bStop && !BUTTON_PRESS()) {
// Watchdog hit
WDT_HIT();
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;
case RHT2F_AUTHENTICATE: {
bStop = !hitag2_authenticate(rx,rxlen,tx,&txlen);
} break;
+ case RHT2F_CRYPTO: {
+ bStop = !hitag2_crypto(rx,rxlen,tx,&txlen, false);
+ } break;
case RHT2F_TEST_AUTH_ATTEMPTS: {
bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen);
} break;
+ case RHT2F_UID_ONLY: {
+ bStop = !hitag2_read_uid(rx, rxlen, tx, &txlen);
+ attempt_count++; //attempt 3 times to get uid then quit
+ if (!bStop && attempt_count == 3) bStop = true;
+ } break;
default: {
Dbprintf("Error, unknown function: %d",htf);
return;
} 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);
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));
rxlen = 0;
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
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) {
- //DbpString("wierd1?");
+ //Dbprintf("DEBUG: Wierd1");
}
// Capture the T0 periods that have passed since last communication or field drop (reset)
// We always recieve a 'one' first, which has the falling edge after a half period |-_|
response = ra-HITAG_T_TAG_HALF_PERIOD;
} else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) {
// Manchester coding example |-_|_-|-_| (101)
+
+ //need to test to verify we don't exceed memory...
+ //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+ // break;
+ //}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
rx[rxlen / 8] |= 1 << (7-(rxlen%8));
rxlen++;
} else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) {
// Manchester coding example |_-|...|_-|-_| (0...01)
+
+ //need to test to verify we don't exceed memory...
+ //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+ // break;
+ //}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
// We have to skip this half period at start and add the 'one' the second time
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--;
rxlen++;
}
} else {
+ //Dbprintf("DEBUG: Wierd2");
+ errorCount++;
// Ignore wierd value, is to small to mean anything
}
}
-
+ //if we saw over 100 wierd values break it probably isn't hitag...
+ if (errorCount >100) break;
// We can break this loop if we received the last bit from a frame
if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) {
if (rxlen>0) break;
}
}
}
+ //Dbprintf("DEBUG: Done waiting for frame");
+
LED_B_OFF();
LED_D_OFF();
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ //Dbprintf("frame received: %d",frame_count);
+ //DbpString("All done");
+ if (bSuccessful)
+ cmd_send(CMD_ACK,bSuccessful,0,0,(byte_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;
+ byte_t rx[HITAG_FRAME_LEN];
+ size_t rxlen=0;
+ byte_t txbuf[HITAG_FRAME_LEN];
+ byte_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;
+ default: {
+ Dbprintf("Error, unknown function: %d",htf);
+ return;
+ } break;
+ }
-// Dbprintf("frame received: %d",frame_count);
-// DbpString("All done");
+ 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
+ AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
+
+ // Capture mode, defaul 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()) {
+ // Watchdog hit
+ 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;
+ 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, 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;
+ }
+ }
+
+ // 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);
}
projects / proxmark3-svn / blobdiff