#include "iso14443crc.h"
#include "parity.h"
#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;
+static TAuthData AuthData;
+
+void ClearAuthData() {
+ AuthData.uid = 0;
+ AuthData.nt = 0;
+ AuthData.first_auth = true;
+}
/**
* @brief iso14443A_CRC_check Checks CRC in command or response
{
switch(MifareAuthState) {
case masNone:
- case masData:
- case masDataNested:
case masError:
return iso14443A_CRC_check(isResponse, data, len);
default:
return 2;
}
-
}
void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
{
switch(cmd[0])
{
- case ISO14443A_CMD_WUPA: snprintf(exp,size,"WUPA"); break;
+ case ISO14443A_CMD_WUPA:
+ snprintf(exp,size,"WUPA");
+ MifareAuthState = masNone;
+ break;
case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
// 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
// 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
snprintf(exp,size,"ANTICOLL-2"); break;
}
}
- case ISO14443A_CMD_REQA: snprintf(exp,size,"REQA"); break;
+ case ISO14443A_CMD_REQA:
+ snprintf(exp,size,"REQA");
+ MifareAuthState = masNone;
+ break;
case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
case ISO14443A_CMD_HALT:
return;
}
-void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, bool isResponse) {
+void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
+ // get UID
+ if (MifareAuthState == masNone) {
+ if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
+ ClearAuthData();
+ AuthData.uid = bytes_to_num(&cmd[2], 4);
+ }
+ if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
+ ClearAuthData();
+ AuthData.uid = bytes_to_num(&cmd[2], 4);
+ }
+ }
+
switch(MifareAuthState) {
case masNt:
- if (cmdsize == 4) {
- snprintf(exp,size,"AUTH: nt");
+ if (cmdsize == 4 && isResponse) {
+ snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
MifareAuthState = masNrAr;
- printf("--ntok\n");
+ if (AuthData.first_auth)
+ AuthData.nt = bytes_to_num(cmd, 4);
+ else
+ AuthData.nt_enc = bytes_to_num(cmd, 4);
+ AuthData.nt_enc_par = parity[0];
return;
} else {
MifareAuthState = masError;
- printf("--err %d\n", cmdsize);
}
break;
case masNrAr:
- if (cmdsize == 8) {
- snprintf(exp,size,"AUTH: nr ar");
+ if (cmdsize == 8 && !isResponse) {
+ snprintf(exp,size,"AUTH: nr ar (enc)");
MifareAuthState = masAt;
+ AuthData.nr_enc = bytes_to_num(cmd, 4);
+ AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
+ AuthData.ar_enc_par = parity[0] << 4;
return;
} else {
MifareAuthState = masError;
}
break;
case masAt:
- if (cmdsize == 4) {
- snprintf(exp,size,"AUTH: at");
- MifareAuthState = masData;
+ if (cmdsize == 4 && isResponse) {
+ snprintf(exp,size,"AUTH: at (enc)");
+ MifareAuthState = masAuthComplete;
+ AuthData.at_enc = bytes_to_num(cmd, 4);
+ AuthData.at_enc_par = parity[0];
return;
} else {
MifareAuthState = masError;
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;
+
+ if (MifareAuthState == masFirstData) {
+ if (AuthData.first_auth) {
+ uint32_t ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
+ uint32_t ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
+ struct Crypto1State *revstate = lfsr_recovery64(ks2, 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),
+ 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;
+ }
+
+ 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