X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/31cf80487727e43b6a7e75416a4a1c25d2c4dc8c..36dc0b437017bf360787afe3c15fd3cbaf941dd2:/client/nonce2key/nonce2key.c

diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index ab97f597..64d35873 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)", uid, nt, par_info, ks_info, nr);
 
 	for ( pos = 0; pos < 8; pos++ ) {
 		ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
@@ -30,17 +30,19 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 		}
 	}
 
-	printf("+----+--------+---+-----+---------------+\n");
-	printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
-	printf("+----+--------+---+-----+---------------+\n");
+	PrintAndLog("+----+--------+---+-----+---------------+");
+	PrintAndLog("|diff|{nr}    |ks3|ks3^5|parity         |");
+	PrintAndLog("+----+--------+---+-----+---------------+");
 	for ( i = 0; i < 8; i++) {
 		nr_diff = nr | i << 5;
-		printf("| %02x |%08x| %01x |  %01x  |", i << 5, nr_diff, ks3x[i], ks3x[i]^5);
 
-		for (pos = 0; pos < 7; pos++) printf("%01x,", par[i][pos]);
-		printf("%01x|\n", par[i][7]);
+		PrintAndLog("| %02x |%08x| %01x |  %01x  |%01x,%01x,%01x,%01x,%01x,%01x,%01x,%01x|",
+			i << 5, nr_diff, ks3x[i], ks3x[i]^5,
+			par[i][0], par[i][1], par[i][2], par[i][3],
+			par[i][4], par[i][5], par[i][6], par[i][7]);
+
 	}
-	printf("+----+--------+---+-----+---------------+\n");
+	PrintAndLog("+----+--------+---+-----+---------------+");
 
 	clock_t t1 = clock();
 
@@ -50,19 +52,23 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
 	crypto1_destroy(state);
 
 	t1 = clock() - t1;
-	if ( t1 > 0 ) PrintAndLog("Time in nonce2key: %.0f ticks \n", (float)t1);
+	if ( t1 > 0 ) PrintAndLog("Time in nonce2key: %.0f ticks", (float)t1);
 	return 0;
 }
 
+int compar_intA(const void * a, const void * b) {
+	if (*(int64_t*)b == *(int64_t*)a) return 0;
+	if (*(int64_t*)b > *(int64_t*)a) return 1;
+	return -1;
+}
+
 // 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];
-
+	uint8_t ks3x[8];
 	uint64_t key_recovered;
-
 	int64_t *state_s;
 	static uint8_t last_blockno;
 	static uint8_t last_keytype;
@@ -83,58 +89,70 @@ int nonce2key_ex(uint8_t blockno, uint8_t keytype, uint32_t uid, uint32_t nt, ui
 
 	// 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);
  
+	// split keystream into array
 	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...");
-	
+ 
+	// find possible states for this keystream
 	state = lfsr_common_prefix_ex(nr, ks3x);
+
+	if (!state) {
+		PrintAndLog("Failed getting states");
+		return 1;
+	}
+	
 	state_s = (int64_t*)state;
 	
+	uint32_t xored = uid ^ nt;
+	
 	for (i = 0; (state) && ((state + i)->odd != -1); i++) {
-		lfsr_rollback_word(state + i, uid ^ nt, 0);
+		lfsr_rollback_word(state + i, xored, 0);
 		crypto1_get_lfsr(state + i, &key_recovered);
 		*(state_s + i) = key_recovered;
 	}
-	
-	if(!state)
-		return 1;
-	
-	qsort(state_s, i, sizeof(*state_s), compar_int);
+
+	qsort(state_s, i, sizeof(int64_t), compar_intA);
 	*(state_s + i) = -1;
 	
-	//Create the intersection:
-	if ( last_keylist != NULL) {
+	// first call to this function.  clear all other stuff and set new found states.
+	if (last_keylist == NULL) {
+		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)", uid, nt, ks_info, nr);
+		return 1;
+	}
 
-		int64_t *p1, *p2, *p3;
-		p1 = p3 = last_keylist; 
-		p2 = state_s;
+	PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)", 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_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);
-				*p3++ = *p1++;
-				p2++;
-			}
-			else {
-				while (compar_int(p1, p2) == -1) ++p1;
-				while (compar_int(p1, p2) == 1) ++p2;
-			}
+	while ( *p1 != -1 && *p2 != -1 ) {
+		if (compar_intA(p1, p2) == 0) {
+			PrintAndLog("p1:%"llx" p2:%"llx" p3:%"llx" key:%012"llx,(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;
-		PrintAndLog("one A");
-	} else {
-		key_count = 0;
-		PrintAndLog("one B");
 	}
-
-	printf("key_count:%d\n", key_count);
+	key_count = p3 - last_keylist;
+	PrintAndLog("key_count: %d", key_count);
+	if ( key_count == 0 ){
+		free(state);
+		state = NULL;
+		return 0;
+	}
 	
-	// The list may still contain several key candidates. Test each of them with mfCheckKeys
+	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++) {
@@ -143,20 +161,21 @@ int nonce2key_ex(uint8_t blockno, uint8_t keytype, uint32_t uid, uint32_t nt, ui
 		key64 = 0;
 		if (!mfCheckKeys(blockno, keytype, false, 1, keyBlock, &key64)) {
 			*key = key64;
-			free(last_keylist);
-			last_keylist = NULL;
-			free(state);
-			return 0;
+			retval = 0;
+			goto out;
 		}
-	}	
+	}
 	
+out:
 	free(last_keylist);
-	last_keylist = state_s;
-	return 1;
+	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 tryMfk32(nonces_t data, uint64_t *outputkey, bool verbose) {
 	struct Crypto1State *s,*t;
 	uint64_t outkey = 0;
 	uint64_t key=0;     // recovered key
@@ -166,12 +185,26 @@ bool tryMfk32(nonces_t data, uint64_t *outputkey) {
 	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
-	clock_t t1 = clock();
 	bool isSuccess = FALSE;
 	uint8_t counter = 0;
-
-
-	s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+	
+	clock_t t1 = clock();
+	uint32_t p64 = prng_successor(nt, 64);
+		
+	if ( verbose ) {
+		PrintAndLog("Recovering key for:");
+		PrintAndLog("    uid: %08x",uid);
+		PrintAndLog("     nt: %08x",nt);
+		PrintAndLog(" {nr_0}: %08x",nr0_enc);
+		PrintAndLog(" {ar_0}: %08x",ar0_enc);
+		PrintAndLog(" {nr_1}: %08x",nr1_enc);
+		PrintAndLog(" {ar_1}: %08x",ar1_enc);
+		PrintAndLog("\nLFSR succesors of the tag challenge:");
+		PrintAndLog("  nt': %08x", p64);
+		PrintAndLog(" nt'': %08x", 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);
@@ -180,8 +213,7 @@ 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))) {
-			//PrintAndLog("Found Key: [%012"llx"]", key);
+		if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
 			outkey = key;
 			++counter;
 			if (counter==20) break;
@@ -189,13 +221,14 @@ 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;
+	if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks  - possible keys %d", (float)t1, counter);
+
+	*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 verbose) {
 	struct Crypto1State *s, *t;
 	uint64_t outkey  = 0;
 	uint64_t key 	 = 0;			     // recovered key
@@ -209,11 +242,27 @@ bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 	uint32_t ar1_enc = data.ar2; // second encrypted reader response	
 	bool isSuccess = FALSE;
 	int counter = 0;
-	
-	//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 (verbose) {
+		PrintAndLog("Recovering key for:");
+		PrintAndLog("    uid: %08x", uid);
+		PrintAndLog("   nt_0: %08x", nt0);
+		PrintAndLog(" {nr_0}: %08x", nr0_enc);
+		PrintAndLog(" {ar_0}: %08x", ar0_enc);
+		PrintAndLog("   nt_1: %08x", nt1);
+		PrintAndLog(" {nr_1}: %08x", nr1_enc);
+		PrintAndLog(" {ar_1}: %08x", ar1_enc);
+		PrintAndLog("\nLFSR succesors of the tag challenge:");
+		PrintAndLog("  nt': %08x", p640);
+		PrintAndLog(" nt'': %08x", 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);
@@ -223,8 +272,7 @@ 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))) {
-			//PrintAndLog("Found Key: [%012"llx"]",key);
+		if (ar1_enc == (crypto1_word(t, 0, 0) ^ p641)) {
 			outkey=key;
 			++counter;
 			if (counter==20) break;
@@ -232,7 +280,9 @@ 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);
+	if (verbose) {
+		if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks  - possible keys %d", (float)t1, counter);
+	}
 	*outputkey = ( isSuccess ) ? outkey : 0;
 	crypto1_destroy(s);
 	return isSuccess;
@@ -248,9 +298,9 @@ 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");
@@ -265,11 +315,12 @@ 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);
+	if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks", (float)t1);
+
+	*outputkey = key;
+	crypto1_destroy(revstate);
 	return 0;
 }