#include "protocols.h"
#include "crapto1/crapto1.h"
#include "mifarehost.h"
+#include "mifaredefault.h"
enum MifareAuthSeq {
masNt,
masNrAr,
masAt,
+ masAuthComplete,
masFirstData,
masData,
- masDataNested,
masError,
};
static enum MifareAuthSeq MifareAuthState;
{
switch(MifareAuthState) {
case masNone:
- case masFirstData:
- case masData:
- case masDataNested:
case masError:
return iso14443A_CRC_check(isResponse, data, len);
default:
case masAt:
if (cmdsize == 4 && isResponse) {
snprintf(exp,size,"AUTH: at (enc)");
- MifareAuthState = masFirstData;
+ MifareAuthState = masAuthComplete;
AuthData.at_enc = bytes_to_num(cmd, 4);
AuthData.at_enc_par = parity[0];
return;
break;
}
- if (!isResponse)
+ if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
annotateIso14443a(exp, size, cmd, cmdsize);
}
bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
+ static struct Crypto1State *traceCrypto1;
+ static uint64_t mfLastKey;
+
*mfDataLen = 0;
+ if (MifareAuthState == masAuthComplete) {
+ if (traceCrypto1) {
+ crypto1_destroy(traceCrypto1);
+ }
+
+ MifareAuthState = masFirstData;
+ return false;
+ }
+
if (cmdsize > 32)
return false;
uint64_t lfsr = 0;
crypto1_get_lfsr(revstate, &lfsr);
crypto1_destroy(revstate);
-// LastKey = lfsr;
- printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
- printf("AUTH: probable key:%x%x Prng:%s ks2:%08x ks3:%08x\n",
+ mfLastKey = lfsr;
+ PrintAndLog(" | * | key | probable key:%x%x Prng:%s ks2:%08x ks3:%08x | |",
(unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF),
- validate_prng_nonce(AuthData.nt) ? "WEAK": "HARDEND",
+ validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
ks2,
ks3);
AuthData.first_auth = false;
+
+ traceCrypto1 = lfsr_recovery64(ks2, ks3);
} else {
+ printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
+
+ // check last used key
+ if (mfLastKey) {
+ if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize)) {
+ };
+ }
+
+ // check default keys
+ for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
+ if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize)) {
+
+ break;
+ };
+ }
+
+ // nested
+ if (validate_prng_nonce(AuthData.nt)) {
+ }
+
+ //hardnested
}
MifareAuthState = masData;
- return true;
}
- if (MifareAuthState == masData) {
+ if (MifareAuthState == masData && traceCrypto1) {
+ memcpy(mfData, cmd, cmdsize);
+ mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
+ *mfDataLen = cmdsize;
}
return *mfDataLen > 0;
}
+bool NTParityChk(TAuthData *ad, uint32_t ntx) {
+ if (
+ (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
+ (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
+ (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t ar = prng_successor(ntx, 64);
+ if (
+ (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
+ (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
+ (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t at = prng_successor(ntx, 96);
+ if (
+ (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
+ (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
+ (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
+ (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
+ )
+ return false;
+
+ return true;
+}
+
+bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize) {
+ uint8_t buf[32] = {0};
+ struct Crypto1State *pcs;
+
+ pcs = crypto1_create(key);
+ uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
+ uint32_t ar = prng_successor(nt1, 64);
+ uint32_t at = prng_successor(nt1, 96);
+ printf("key> nested auth uid: %08x nt: %08x nt_parity: %s ar: %08x at: %08x\n", ad->uid, nt1, printBitsPar(&ad->nt_enc_par, 4), ar, at);
+ uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc;
+ uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
+ uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
+ printf("key> the same key test. nr1: %08x ar1: %08x at1: %08x \n", nr1, ar1, at1);
+
+ if (NTParityChk(ad, nt1))
+ printf("key> the same key test OK. key=%x%x\n", (unsigned int)((key & 0xFFFFFFFF00000000) >> 32), (unsigned int)(key & 0xFFFFFFFF));
+ else {
+ printf("key> the same key test. check nt parity error.\n");
+ return false;
+ }
+
+ memcpy(buf, cmd, cmdsize);
+ mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
+
+ crypto1_destroy(pcs);
+
+ return CheckCrc14443(CRC_14443_A, buf, cmdsize);
+}
\ No newline at end of file
projects / proxmark3-svn / blobdiff