static bool bQuiet;
bool bCrypto;
+bool bAuthenticating;
bool bPwd;
struct hitag2_tag {
byte_t sectors[12][4];
};
-static struct hitag2_tag tag;
-static const struct hitag2_tag resetdata = {
+static struct hitag2_tag tag = {
.state = TAG_STATE_RESET,
.sectors = { // Password mode: | Crypto mode:
[0] = { 0x02, 0x4e, 0x02, 0x20}, // UID | UID
byte_t password[4];
byte_t NrAr[8];
+byte_t key[8];
+uint64_t cipher_state;
/* Following is a modified version of cryptolib.com/ciphers/hitag2/ */
// Software optimized 48-bit Philips/NXP Mifare Hitag2 PCF7936/46/47/52 stream cipher algorithm by I.C. Wiener 2006-2007.
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) |
LOW(GPIO_SSC_DOUT);
}
+size_t blocknr;
+
bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
// Reset the transmission frame length
*txlen = 0;
memcpy(tx,password,4);
bPwd = true;
} else {
- DbpString("Password succesful!");
- // We are done... for now
- return false;
+ if (blocknr > 7) {
+ DbpString("Read succesful!");
+ // We are done... for now
+ return false;
+ }
+ *txlen = 10;
+ tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
+ tx[1] = ((blocknr^7) << 6);
+ blocknr++;
}
} break;
// Unexpected response
- default: {
+ default: {
+ Dbprintf("Uknown frame length: %d",rxlen);
+ return false;
+ } break;
+ }
+ return true;
+}
+
+bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+ // Reset the transmission frame length
+ *txlen = 0;
+
+ if(bCrypto) {
+ hitag2_cipher_transcrypt(&cipher_state,rx,rxlen/8,rxlen%8);
+ }
+
+ // Try to find out which command was send by selecting on length (in bits)
+ switch (rxlen) {
+ // No answer, try to resurrect
+ case 0: {
+ // Stop if there is no answer while we are in crypto mode (after sending NrAr)
+ if (bCrypto) {
+ DbpString("Authentication failed!");
+ return false;
+ }
+ *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!");
+ // We are done... for now
+ return false;
+ }
+ *txlen = 10;
+ tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
+ tx[1] = ((blocknr^7) << 6);
+ }
+ } break;
+
+ // Unexpected response
+ default: {
Dbprintf("Uknown frame length: %d",rxlen);
return false;
} break;
}
+
+
+ if(bCrypto) {
+ // We have to return now to avoid double encryption
+ if (!bAuthenticating) {
+ hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8);
+ }
+ }
+
return true;
}
+
bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
// Reset the transmission frame length
*txlen = 0;
size_t rxlen=0;
// Clean up trace and prepare it for storing frames
- iso14a_set_tracing(TRUE);
- iso14a_clear_trace();
+ iso14a_set_tracing(TRUE);
+ iso14a_clear_trace();
auth_table_len = 0;
auth_table_pos = 0;
bQuiet = false;
// Clean up trace and prepare it for storing frames
- iso14a_set_tracing(TRUE);
- iso14a_clear_trace();
+ iso14a_set_tracing(TRUE);
+ iso14a_clear_trace();
auth_table_len = 0;
auth_table_pos = 0;
memset(auth_table, 0x00, AUTH_TABLE_LENGTH);
bool bQuitTraceFull = false;
// Clean up trace and prepare it for storing frames
- iso14a_set_tracing(TRUE);
- iso14a_clear_trace();
+ iso14a_set_tracing(TRUE);
+ iso14a_clear_trace();
DbpString("Starting Hitag reader family");
// Check configuration
switch(htf) {
case RHT2F_PASSWORD: {
- Dbprintf("List identifier in password mode");
+ Dbprintf("List identifier in password mode");
memcpy(password,htd->pwd.password,4);
+ blocknr = 0;
bQuitTraceFull = false;
bQuiet = false;
bPwd = false;
} break;
+
case RHT2F_AUTHENTICATE: {
- DbpString("Authenticating in crypto mode");
+ DbpString("Authenticating using nr,ar pair:");
memcpy(NrAr,htd->auth.NrAr,8);
- Dbprintf("Reader-challenge:");
Dbhexdump(8,NrAr,false);
bQuiet = false;
bCrypto = false;
+ bAuthenticating = false;
+ bQuitTraceFull = true;
+ } break;
+
+ case RHT2F_CRYPTO: {
+ DbpString("Authenticating using key:");
+ memcpy(key,htd->crypto.key,6);
+ Dbhexdump(6,key,false);
+ blocknr = 0;
+ bQuiet = false;
+ bCrypto = false;
+ bAuthenticating = false;
bQuitTraceFull = true;
} break;
case RHT2F_AUTHENTICATE: {
bStop = !hitag2_authenticate(rx,rxlen,tx,&txlen);
} break;
+ case RHT2F_CRYPTO: {
+ bStop = !hitag2_crypto(rx,rxlen,tx,&txlen);
+ } break;
case RHT2F_TEST_AUTH_ATTEMPTS: {
bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen);
} break;
projects / proxmark3-svn / blobdiff