X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f0e183ece4b5d0a46857bf8386de5cac9ed76a79..bc7846f4376472abdc9ced23436dfe3b6dd20e7f:/client/nonce2key/nonce2key.c

diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index d3fd2ed4..aeaecbe6 100644
--- a/client/nonce2key/nonce2key.c
+++ b/client/nonce2key/nonce2key.c
@@ -19,7 +19,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 	// Reset the last three significant bits of the reader nonce
 	nr &= 0xffffff1f;
   
-	PrintAndLog("uid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n", uid, nt, par_info, ks_info, nr);
+	PrintAndLog("uid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08x)\n", uid, nt, par_info, ks_info, nr);
 
 	for ( pos = 0; pos < 8; pos++ ) {
 		ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
@@ -45,7 +45,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 	clock_t t1 = clock();
 
 	state = lfsr_common_prefix(nr, rr, ks3x, par);
-	lfsr_rollback_word(state, uid^nt, 0);
+	lfsr_rollback_word(state, uid ^ nt, 0);
 	crypto1_get_lfsr(state, key);
 	crypto1_destroy(state);
 
@@ -54,50 +54,52 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 	return 0;
 }
 
-// call when PAR == 0,  special attack?
-int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint64_t * key) {
+// call when PAR == 0,  special attack?  It seems to need two calls.  with same uid, block, keytype
+int nonce2key_ex(uint8_t blockno, uint8_t keytype, uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint64_t * key) {
+
 	struct Crypto1State *state;
 	uint32_t i, pos, key_count;
 	byte_t ks3x[8];
 
 	uint64_t key_recovered;
+
 	int64_t *state_s;
+	static uint8_t last_blockno;
+	static uint8_t last_keytype;
 	static uint32_t last_uid;
 	static int64_t *last_keylist;
-
-	if (last_uid != uid && last_keylist != NULL) {
+  
+	if (last_uid != uid &&
+		last_blockno != blockno &&
+		last_keytype != keytype &&
+		last_keylist != NULL)
+	{
 		free(last_keylist);
 		last_keylist = NULL;
 	}
 	last_uid = uid;
+	last_blockno = blockno;
+	last_keytype = keytype;
 
 	// Reset the last three significant bits of the reader nonce
 	nr &= 0xffffff1f;
 
-	PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08"llx")\n", uid, nt, ks_info, nr);
+	PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)\n", uid, nt, ks_info, nr);
  
 	for (pos=0; pos<8; pos++) {
 		ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
 	}
   
-	PrintAndLog("parity is all zero,try special attack! just wait for few more seconds");
-
-	clock_t t1 = clock();
+  	PrintAndLog("parity is all zero, try special attack. Just wait for few more seconds...");
 	
 	state = lfsr_common_prefix_ex(nr, ks3x);
 	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 + i)->odd != -1); i++) {
-		lfsr_rollback_word(state+i, uid^nt, 0);
+		lfsr_rollback_word(state + i, uid ^ nt, 0);
 		crypto1_get_lfsr(state + i, &key_recovered);
 		*(state_s + i) = key_recovered;
-		//fprintf(fp, "%012llx\n",key_recovered);
 	}
-	//fclose(fp);
 	
 	if(!state)
 		return 1;
@@ -107,9 +109,11 @@ int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint6
 	
 	//Create the intersection:
 	if ( last_keylist != NULL) {
+
 		int64_t *p1, *p2, *p3;
 		p1 = p3 = last_keylist; 
 		p2 = state_s;
+		
 		while ( *p1 != -1 && *p2 != -1 ) {
 			if (compar_int(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);
@@ -121,32 +125,31 @@ int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint6
 				while (compar_int(p1, p2) == 1) ++p2;
 			}
 		}
-		key_count = p3 - last_keylist;;
+		key_count = p3 - last_keylist;
+		PrintAndLog("one A");
 	} else {
 		key_count = 0;
+		PrintAndLog("one B");
 	}
 
 	printf("key_count:%d\n", key_count);
 	
 	// The list may still contain several key candidates. Test each of them with mfCheckKeys
-	uint8_t keyBlock[6];
+	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(0, 0, TRUE, 1, keyBlock, &key64)) {  //block 0,A,
+		if (!mfCheckKeys(blockno, keytype, false, 1, keyBlock, &key64)) {
 			*key = key64;
 			free(last_keylist);
 			last_keylist = NULL;
 			free(state);
 			return 0;
 		}
-	}
-
-	t1 = clock() - t1;
-	if ( t1 > 0 ) PrintAndLog("Time in nonce2key_special: %.0f ticks \n", (float)t1);
-
+	}	
+	
 	free(last_keylist);
 	last_keylist = state_s;
 	return 1;
@@ -167,8 +170,20 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
 	bool isSuccess = FALSE;
 	uint8_t counter = 0;
 
+	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);
 
-	s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+	printf("\nLFSR succesors of the tag challenge:\n");
+	uint32_t p64 = prng_successor(nt, 64);
+	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);
@@ -177,7 +192,7 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
 		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))) {
+		if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
 			//PrintAndLog("Found Key: [%012"llx"]", key);
 			outkey = key;
 			++counter;
@@ -187,12 +202,13 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
  	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;
+
+	*outputkey = ( isSuccess ) ? outkey : 0;	
 	crypto1_destroy(s);
 	return isSuccess;
 }
 
-bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
+bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey, bool showMaths) {
 	struct Crypto1State *s, *t;
 	uint64_t outkey  = 0;
 	uint64_t key 	 = 0;			     // recovered key
@@ -207,10 +223,30 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 	bool isSuccess = FALSE;
 	int counter = 0;
 	
+	if (showMaths) {
+		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);
+	}
+
 	//PrintAndLog("Enter mfkey32_moebius");
 	clock_t t1 = clock();
 
-	s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
+	uint32_t p640 = prng_successor(nt0, 64);
+	uint32_t p641 = prng_successor(nt1, 64);
+	
+	if (showMaths) {
+		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);
   
 	for(t = s; t->odd | t->even; ++t) {
 		lfsr_rollback_word(t, 0, 0);
@@ -220,7 +256,7 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 		
 		crypto1_word(t, uid ^ nt1, 0);
 		crypto1_word(t, nr1_enc, 1);
-		if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
+		if (ar1_enc == (crypto1_word(t, 0, 0) ^ p641)) {
 			//PrintAndLog("Found Key: [%012"llx"]",key);
 			outkey=key;
 			++counter;
@@ -230,6 +266,7 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
     isSuccess	= (counter > 0);
 	t1 = clock() - t1;
 	if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks  - possible keys %d\n", (float)t1, counter);
+
 	*outputkey = ( isSuccess ) ? outkey : 0;
 	crypto1_destroy(s);
 	return isSuccess;
@@ -245,9 +282,9 @@ int tryMfk64_ex(uint8_t *data, uint64_t *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
+	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");
@@ -262,11 +299,12 @@ int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32
 	lfsr_rollback_word(revstate, nr_enc, 1);
 	lfsr_rollback_word(revstate, uid ^ nt, 0);
 	crypto1_get_lfsr(revstate, &key);
+
 	PrintAndLog("Found Key: [%012"llx"]", key);
-	crypto1_destroy(revstate);
-	*outputkey = key;
-	
 	t1 = clock() - t1;
 	if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks \n", (float)t1);
+
+	*outputkey = key;
+	crypto1_destroy(revstate);
 	return 0;
 }