if (MifareAuthState == masAuthComplete) {
if (traceCrypto1) {
crypto1_destroy(traceCrypto1);
+ traceCrypto1 = NULL;
}
MifareAuthState = masFirstData;
if (AuthData.first_auth) {
AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
- struct Crypto1State *revstate = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
- lfsr_rollback_word(revstate, 0, 0);
- lfsr_rollback_word(revstate, 0, 0);
- lfsr_rollback_word(revstate, AuthData.nr_enc, 1);
- lfsr_rollback_word(revstate, AuthData.uid ^ AuthData.nt, 0);
-
- uint64_t lfsr = 0;
- crypto1_get_lfsr(revstate, &lfsr);
- crypto1_destroy(revstate);
- mfLastKey = lfsr;
- PrintAndLog(" | * | key | probable key:%x%x Prng:%s ks2:%08x ks3:%08x | |",
- (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32),
- (unsigned int)(lfsr & 0xFFFFFFFF),
+
+ mfLastKey = GetCrypto1ProbableKey(&AuthData);
+ PrintAndLog(" | * | key | probable key:%010"PRIx64" Prng:%s ks2:%08x ks3:%08x | |",
+ mfLastKey,
validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
AuthData.ks2,
AuthData.ks3);
traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
} else {
+ if (traceCrypto1) {
+ crypto1_destroy(traceCrypto1);
+ traceCrypto1 = NULL;
+ }
+
// check last used key
- if (mfLastKey) {
+ if (false && mfLastKey) {
if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
- PrintAndLog(" | * | key | last used key:%x%x ks2:%08x ks3:%08x | |",
- (unsigned int)((mfLastKey & 0xFFFFFFFF00000000) >> 32),
- (unsigned int)(mfLastKey & 0xFFFFFFFF),
+ PrintAndLog(" | * | key | last used key:%010"PRIx64" ks2:%08x ks3:%08x | |",
+ mfLastKey,
AuthData.ks2,
AuthData.ks3);
}
// check default keys
- if (!traceCrypto1) {
+ if (false && !traceCrypto1) {
for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
- PrintAndLog(" | * | key | default key:%x%x ks2:%08x ks3:%08x | |",
- (unsigned int)((MifareDefaultKeys[defaultKeyCounter] & 0xFFFFFFFF00000000) >> 32),
- (unsigned int)(MifareDefaultKeys[defaultKeyCounter] & 0xFFFFFFFF),
+ PrintAndLog(" | * | key | default key:%010"PRIx64" ks2:%08x ks3:%08x | |",
+ MifareDefaultKeys[defaultKeyCounter],
AuthData.ks2,
AuthData.ks3);
+ mfLastKey = MifareDefaultKeys[defaultKeyCounter];
traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
break;
};
// nested
if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
-printf("nested. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
- uint32_t ntx = prng_successor(AuthData.nt, 90);
+ uint32_t ntx = prng_successor(AuthData.nt, 90);
for (int i = 0; i < 16383; i++) {
ntx = prng_successor(ntx, 1);
if (NTParityChk(&AuthData, ntx)){
mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
crypto1_destroy(pcs);
- if (CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
+ if (CheckCrypto1Parity(cmd, cmdsize, mfData, parity) && CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
AuthData.ks2 = ks2;
AuthData.ks3 = ks3;
+
+ AuthData.nt = ntx;
+ mfLastKey = GetCrypto1ProbableKey(&AuthData);
+ PrintAndLog(" | * | key | nested probable key:%010"PRIx64" ks2:%08x ks3:%08x | |",
+ mfLastKey,
+ AuthData.ks2,
+ AuthData.ks3);
+
traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
break;
}
}
}
- if (traceCrypto1)
- printf("key> nt=%08x nonce distance=%d \n", ntx, nonce_distance(AuthData.nt, ntx));
- else
- printf("key> don't have any valid nt( \n");
}
//hardnested
crypto1_destroy(pcs);
- if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
- return false;
-
if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
return false;
+ if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
+ return false;
+
+ AuthData.nt = nt1;
AuthData.ks2 = AuthData.ar_enc ^ ar;
AuthData.ks3 = AuthData.at_enc ^ at;
return true;
}
-bool CheckCrypto1Parity(uint8_t *cmd, uint8_t cmdsize, uint8_t *cmd_enc, uint8_t *parity_enc) {
- printf("parity check. size=%d\n", cmdsize);
- printf("cmd =%s\n", sprint_hex(cmd, cmdsize));
- printf("cmd_enc=%s\n", sprint_hex(cmd_enc, cmdsize));
- printf("parity=%s\n", printBitsPar(parity_enc, cmdsize));
-// (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
+bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
for (int i = 0; i < cmdsize - 1; i++) {
- bool b = oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (6 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01);
- printf("i=%d b=%d\n", i, b);
- if (b)
+ if (oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01))
return false;
}
return true;
}
+
+uint64_t GetCrypto1ProbableKey(TAuthData *ad) {
+ struct Crypto1State *revstate = lfsr_recovery64(ad->ks2, ad->ks3);
+ lfsr_rollback_word(revstate, 0, 0);
+ lfsr_rollback_word(revstate, 0, 0);
+ lfsr_rollback_word(revstate, ad->nr_enc, 1);
+ lfsr_rollback_word(revstate, ad->uid ^ ad->nt, 0);
+
+ uint64_t lfsr = 0;
+ crypto1_get_lfsr(revstate, &lfsr);
+ crypto1_destroy(revstate);
+
+ return lfsr;
+}
projects / proxmark3-svn / blobdiff