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fix "hf mf chk" <t|d|s|ss> flags (based on PR #700) (#718)
[proxmark3-svn] / client / cmdhflist.c
diff --git a/client/cmdhflist.c b/client/cmdhflist.c
index dc3d96400d4cc323ab21a7c9abda38d74cee62af..5538b6fb8a50ff71b2b9d2127cf72824c33ceaca 100644 (file)
--- a/client/cmdhflist.c
+++ b/client/cmdhflist.c
@@ -16,7 +16,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "util.h"
 #include <stdint.h>
 #include <stdbool.h>
 #include "util.h"
-#include "data.h"
 #include "ui.h"
 #include "iso14443crc.h"
 #include "parity.h"
 #include "ui.h"
 #include "iso14443crc.h"
 #include "parity.h"
@@ -43,6 +42,8 @@ void ClearAuthData() {
        AuthData.uid = 0;
        AuthData.nt = 0;
        AuthData.first_auth = true;
        AuthData.uid = 0;
        AuthData.nt = 0;
        AuthData.first_auth = true;
+       AuthData.ks2 = 0;
+       AuthData.ks3 = 0;
 }
 
 /**
 }
 
 /**
@@ -81,13 +82,122 @@ uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
        }
 }
 
        }
 }
 
+void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+       switch(cmd[0])
+       {
+       case ICLASS_CMD_ACTALL:      snprintf(exp,size,"ACTALL"); break;
+       case ICLASS_CMD_READ_OR_IDENTIFY:{
+               if(cmdsize > 1){
+                       snprintf(exp,size,"READ(%d)",cmd[1]);
+               }else{
+                       snprintf(exp,size,"IDENTIFY");
+               }
+               break;
+       }
+       case ICLASS_CMD_SELECT:      snprintf(exp,size,"SELECT"); break;
+       case ICLASS_CMD_PAGESEL:     snprintf(exp,size,"PAGESEL(%d)", cmd[1]); break;
+       case ICLASS_CMD_READCHECK_KC:snprintf(exp,size,"READCHECK[Kc](%d)", cmd[1]); break;
+       case ICLASS_CMD_READCHECK_KD:snprintf(exp,size,"READCHECK[Kd](%d)", cmd[1]); break;
+       case ICLASS_CMD_CHECK:       snprintf(exp,size,"CHECK"); break;
+       case ICLASS_CMD_DETECT:      snprintf(exp,size,"DETECT"); break;
+       case ICLASS_CMD_HALT:        snprintf(exp,size,"HALT"); break;
+       case ICLASS_CMD_UPDATE:      snprintf(exp,size,"UPDATE(%d)",cmd[1]); break;
+       case ICLASS_CMD_ACT:         snprintf(exp,size,"ACT"); break;
+       case ICLASS_CMD_READ4:       snprintf(exp,size,"READ4(%d)",cmd[1]); break;
+       default:                     snprintf(exp,size,"?"); break;
+       }
+       return;
+}
+
+void annotateIso15693(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+
+       if(cmd[0] == 0x26)
+       {
+               switch(cmd[1]){
+               case ISO15693_INVENTORY           :snprintf(exp, size, "INVENTORY");break;
+               case ISO15693_STAYQUIET           :snprintf(exp, size, "STAY_QUIET");break;
+               default:                     snprintf(exp,size,"?"); break;
+
+               }
+       }else if(cmd[0] == 0x02)
+       {
+               switch(cmd[1])
+               {
+               case ISO15693_READBLOCK            :snprintf(exp, size, "READBLOCK");break;
+               case ISO15693_WRITEBLOCK           :snprintf(exp, size, "WRITEBLOCK");break;
+               case ISO15693_LOCKBLOCK            :snprintf(exp, size, "LOCKBLOCK");break;
+               case ISO15693_READ_MULTI_BLOCK     :snprintf(exp, size, "READ_MULTI_BLOCK");break;
+               case ISO15693_SELECT               :snprintf(exp, size, "SELECT");break;
+               case ISO15693_RESET_TO_READY       :snprintf(exp, size, "RESET_TO_READY");break;
+               case ISO15693_WRITE_AFI            :snprintf(exp, size, "WRITE_AFI");break;
+               case ISO15693_LOCK_AFI             :snprintf(exp, size, "LOCK_AFI");break;
+               case ISO15693_WRITE_DSFID          :snprintf(exp, size, "WRITE_DSFID");break;
+               case ISO15693_LOCK_DSFID           :snprintf(exp, size, "LOCK_DSFID");break;
+               case ISO15693_GET_SYSTEM_INFO      :snprintf(exp, size, "GET_SYSTEM_INFO");break;
+               case ISO15693_READ_MULTI_SECSTATUS :snprintf(exp, size, "READ_MULTI_SECSTATUS");break;
+               default:                            snprintf(exp,size,"?"); break;
+               }
+       }
+}
+
+
+void annotateTopaz(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+       switch(cmd[0]) {
+               case TOPAZ_REQA                                         :snprintf(exp, size, "REQA");break;
+               case TOPAZ_WUPA                                         :snprintf(exp, size, "WUPA");break;
+               case TOPAZ_RID                                          :snprintf(exp, size, "RID");break;
+               case TOPAZ_RALL                                         :snprintf(exp, size, "RALL");break;
+               case TOPAZ_READ                                         :snprintf(exp, size, "READ");break;
+               case TOPAZ_WRITE_E                                      :snprintf(exp, size, "WRITE-E");break;
+               case TOPAZ_WRITE_NE                                     :snprintf(exp, size, "WRITE-NE");break;
+               case TOPAZ_RSEG                                         :snprintf(exp, size, "RSEG");break;
+               case TOPAZ_READ8                                        :snprintf(exp, size, "READ8");break;
+               case TOPAZ_WRITE_E8                                     :snprintf(exp, size, "WRITE-E8");break;
+               case TOPAZ_WRITE_NE8                            :snprintf(exp, size, "WRITE-NE8");break;
+               default:                            snprintf(exp,size,"?"); break;
+       }
+}
+
+
+/**
+06 00 = INITIATE
+0E xx = SELECT ID (xx = Chip-ID)
+0B = Get UID
+08 yy = Read Block (yy = block number)
+09 yy dd dd dd dd = Write Block (yy = block number; dd dd dd dd = data to be written)
+0C = Reset to Inventory
+0F = Completion
+0A 11 22 33 44 55 66 = Authenticate (11 22 33 44 55 66 = data to authenticate)
+**/
+
+void annotateIso14443b(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
+{
+       switch(cmd[0]){
+       case ISO14443B_REQB   : snprintf(exp,size,"REQB");break;
+       case ISO14443B_ATTRIB : snprintf(exp,size,"ATTRIB");break;
+       case ISO14443B_HALT   : snprintf(exp,size,"HALT");break;
+       case ISO14443B_INITIATE     : snprintf(exp,size,"INITIATE");break;
+       case ISO14443B_SELECT       : snprintf(exp,size,"SELECT(%d)",cmd[1]);break;
+       case ISO14443B_GET_UID      : snprintf(exp,size,"GET UID");break;
+       case ISO14443B_READ_BLK     : snprintf(exp,size,"READ_BLK(%d)", cmd[1]);break;
+       case ISO14443B_WRITE_BLK    : snprintf(exp,size,"WRITE_BLK(%d)",cmd[1]);break;
+       case ISO14443B_RESET        : snprintf(exp,size,"RESET");break;
+       case ISO14443B_COMPLETION   : snprintf(exp,size,"COMPLETION");break;
+       case ISO14443B_AUTHENTICATE : snprintf(exp,size,"AUTHENTICATE");break;
+       default                     : snprintf(exp,size ,"?");break;
+       }
+
+}
+
 void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
 {
        switch(cmd[0])
        {
        case ISO14443A_CMD_WUPA:        
                snprintf(exp,size,"WUPA"); 
 void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
 {
        switch(cmd[0])
        {
        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)
                break;
        case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
                // 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
@@ -113,7 +223,6 @@ void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
        }
        case ISO14443A_CMD_REQA:                
                snprintf(exp,size,"REQA"); 
        }
        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;
                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;
@@ -187,6 +296,17 @@ void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
 }
 
 void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
 }
 
 void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
+       if (!isResponse && cmdsize == 1) {
+               switch(cmd[0]) {
+                       case ISO14443A_CMD_WUPA:        
+                       case ISO14443A_CMD_REQA:                
+                               MifareAuthState = masNone;
+                               break;
+                       default:
+                               break;
+               }
+       }
+       
        // get UID
        if (MifareAuthState == masNone) {
                if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
        // get UID
        if (MifareAuthState == masNone) {
                if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
@@ -204,11 +324,12 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
                        if (cmdsize == 4 && isResponse) {
                                snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
                                MifareAuthState = masNrAr;
                        if (cmdsize == 4 && isResponse) {
                                snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
                                MifareAuthState = masNrAr;
-                               if (AuthData.first_auth)
+                               if (AuthData.first_auth) {
                                        AuthData.nt = bytes_to_num(cmd, 4);
                                        AuthData.nt = bytes_to_num(cmd, 4);
-                               else
+                               } else {
                                        AuthData.nt_enc = bytes_to_num(cmd, 4);
                                        AuthData.nt_enc_par = parity[0];
                                        AuthData.nt_enc = bytes_to_num(cmd, 4);
                                        AuthData.nt_enc_par = parity[0];
+                               }
                                return;
                        } else {
                                MifareAuthState = masError;
                                return;
                        } else {
                                MifareAuthState = masError;
@@ -246,7 +367,7 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
        
 }
 
        
 }
 
-bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
+bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
        static struct Crypto1State *traceCrypto1;       
        static uint64_t mfLastKey;
        
        static struct Crypto1State *traceCrypto1;       
        static uint64_t mfLastKey;
        
@@ -255,6 +376,7 @@ bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *m
        if (MifareAuthState == masAuthComplete) {
                if (traceCrypto1) {
                        crypto1_destroy(traceCrypto1);
        if (MifareAuthState == masAuthComplete) {
                if (traceCrypto1) {
                        crypto1_destroy(traceCrypto1);
+                       traceCrypto1 = NULL;
                }
 
                MifareAuthState = masFirstData;
                }
 
                MifareAuthState = masFirstData;
@@ -266,49 +388,116 @@ bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *m
        
        if (MifareAuthState == masFirstData) {
                if (AuthData.first_auth) {
        
        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), 
+                       AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
+                       AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
+
+                       mfLastKey = GetCrypto1ProbableKey(&AuthData);
+                       PrintAndLog("            |          * | key | probable key:%012"PRIx64" Prng:%s   ks2:%08x ks3:%08x |     |", 
+                               mfLastKey,
                                validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
                                validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
-                               ks2,
-                               ks3);
+                               AuthData.ks2,
+                               AuthData.ks3);
                        
                        AuthData.first_auth = false;
 
                        
                        AuthData.first_auth = false;
 
-                       traceCrypto1 = lfsr_recovery64(ks2, ks3);
+                       traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
                } else {
                } else {
-                       printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
-                       
+                       if (traceCrypto1) {
+                               crypto1_destroy(traceCrypto1);
+                               traceCrypto1 = NULL;
+                       }
+
                        // check last used key
                        if (mfLastKey) {
                        // check last used key
                        if (mfLastKey) {
-                               if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize)) {
+                               if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
+                                       PrintAndLog("            |          * | key | last used key:%012"PRIx64"            ks2:%08x ks3:%08x |     |", 
+                                               mfLastKey,
+                                               AuthData.ks2,
+                                               AuthData.ks3);
+
+                               traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
                                };
                        }
                        
                        // check default keys
                                };
                        }
                        
                        // check default keys
-                       for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
-                               if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize)) {
-                                       
-                                       break;
-                               };
+                       if (!traceCrypto1) {
+                               for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
+                                       if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
+                                               PrintAndLog("            |          * | key | default key:%012"PRIx64"              ks2:%08x ks3:%08x |     |", 
+                                                       MifareDefaultKeys[defaultKeyCounter],
+                                                       AuthData.ks2,
+                                                       AuthData.ks3);
+
+                                               mfLastKey = MifareDefaultKeys[defaultKeyCounter];
+                                               traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+                                               break;
+                                       };
+                               }
                        }
                        
                        // nested
                        }
                        
                        // nested
-                       if (validate_prng_nonce(AuthData.nt)) {
+                       if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
+                               uint32_t ntx = prng_successor(AuthData.nt, 90); 
+                               for (int i = 0; i < 16383; i++) {
+                                       ntx = prng_successor(ntx, 1);
+                                       if (NTParityChk(&AuthData, ntx)){
+
+                                               uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
+                                               uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
+                                               struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
+                                               memcpy(mfData, cmd, cmdsize);
+                                               mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
+                               
+                                               crypto1_destroy(pcs);
+                                               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:%012"PRIx64"      ks2:%08x ks3:%08x |     |", 
+                                                               mfLastKey,
+                                                               AuthData.ks2,
+                                                               AuthData.ks3);
+
+                                                       traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
+                                                       break;
+                                               }
+                                       }                                               
+                               }
                        }
                        
                        //hardnested
                        }
                        
                        //hardnested
+                       if (!traceCrypto1) {
+                               printf("hardnested not implemented. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
+                               MifareAuthState = masError;
+
+                               /* TOO SLOW( needs to have more strong filter. with this filter - aprox 4 mln tests
+                               uint32_t t = msclock();
+                               uint32_t t1 = t;
+                               int n = 0;
+                               for (uint32_t i = 0; i < 0xFFFFFFFF; i++) {
+                                       if (NTParityChk(&AuthData, i)){
+
+                                               uint32_t ks2 = AuthData.ar_enc ^ prng_successor(i, 64);
+                                               uint32_t ks3 = AuthData.at_enc ^ prng_successor(i, 96);
+                                               struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
+
+
+
+
+                                               n++;
+
+                                               if (!(n % 100000)) {
+                                                       printf("delta=%d n=%d ks2=%x ks3=%x \n", msclock() - t1 , n, ks2, ks3);
+                                                       t1 = msclock();
+                                               }
+
+                                       }
+                               }
+                               printf("delta=%d n=%d\n", msclock() - t, n);
+                               */
+                       }
                }
                
                
                }
                
                
@@ -353,29 +542,65 @@ bool NTParityChk(TAuthData *ad, uint32_t ntx) {
        return true;
 }
 
        return true;
 }
 
-bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize) {
+bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
        uint8_t buf[32] = {0};
        struct Crypto1State *pcs;
        
        uint8_t buf[32] = {0};
        struct Crypto1State *pcs;
        
+       AuthData.ks2 = 0;
+       AuthData.ks3 = 0;
+
        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);
        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;
+
+       crypto1_word(pcs, ad->nr_enc, 1);
+//     uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc;  // if needs deciphered nr
        uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
        uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_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");
+       if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1))) {
+               crypto1_destroy(pcs);
                return false;
        }
 
        memcpy(buf, cmd, cmdsize);
        mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
        
                return false;
        }
 
        memcpy(buf, cmd, cmdsize);
        mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
        
-       return CheckCrc14443(CRC_14443_A, buf, cmdsize);
-}
\ No newline at end of file
+       crypto1_destroy(pcs);
+       
+       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_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
+       for (int i = 0; i < cmdsize - 1; i++) {
+               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;
+}
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