From: iceman1001 <iceman@iuse.se>
Date: Tue, 9 Aug 2016 21:11:07 +0000 (+0200)
Subject: started fixing the paritiy == 0 special attack against chinese clones with bad prng... 
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/59e933fc3f9c4283436b3b317b38c77db0e5d0a7

started fixing the paritiy == 0 special attack against chinese clones with bad prng, which hasnt been working for ages.
---

diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index d6e39444..5465c4d4 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -213,9 +213,11 @@ start:
 	}	
 	printf("\n");
 	
-	// par == 0
-	if (isOK == -1 && par_list == 0) {
-		if (!nonce2key_ex(uid, nt, nr, ks_list, &r_key) ){
+	// par == 0,  and -4
+	if (isOK == -4 && par_list == 0) {
+		// this special attack when parities is zero, uses checkkeys. Which now with block/keytype option also needs. 
+		// but it uses 0|1 instead of 0x60|0x61...
+		if (!nonce2key_ex(blockNo, keytype - 0x60 , uid, nt, nr, ks_list, &r_key) ){
 			PrintAndLog("Found valid key: %012"llx" \n", r_key);
 			goto END;
 		}
diff --git a/client/nonce2key/crapto1.c b/client/nonce2key/crapto1.c
index c17cea7a..a0cd52fe 100644
--- a/client/nonce2key/crapto1.c
+++ b/client/nonce2key/crapto1.c
@@ -541,24 +541,18 @@ struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint8_t ks[8])
 		goto out;
 	}
 
-	// for(o = odd; *o + 1; ++o)
-		// for(e = even; *e + 1; ++e)
-			// for(top = 0; top < 64; ++top) {
-				// *o += 1 << 21;
-				// *e += (!(top & 7) + 1) << 21;
-				// s = check_pfx_parity_ex(pfx, *o, *e, s);
-			// }
-	for(o = odd; *o != -1; ++o)
-		for(e = even; *e != -1; ++e)
+	for(o = odd; *o + 1; ++o)
+		for(e = even; *e + 1; ++e)
 			for(top = 0; top < 64; ++top) {
-				*o = (*o & 0x1fffff) | (top << 21);
-				*e = (*e & 0x1fffff) | (top >> 3) << 21;
+				*o += 1 << 21;
+				*e += (!(top & 7) + 1) << 21;
 				s = check_pfx_parity_ex(pfx, *o, *e, s);
 			}
 
-	s->odd = s->even = -1;	
+	s->odd = s->even = 0;
+
 out:
 	free(odd);
 	free(even);
 	return statelist;
-}
+}
\ No newline at end of file
diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
index d3fd2ed4..3a902ac5 100644
--- a/client/nonce2key/nonce2key.c
+++ b/client/nonce2key/nonce2key.c
@@ -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);
 
@@ -54,22 +54,32 @@ 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;
@@ -80,25 +90,19 @@ int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint6
 		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;
+	PrintAndLog("Prefix");
 	
-	//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);
 	
+	PrintAndLog("zero");
 	if(!state)
 		return 1;
 	
@@ -107,9 +111,12 @@ 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;
+		
+		PrintAndLog("one");
 		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);
@@ -129,24 +136,22 @@ int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint6
 	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;
+	PrintAndLog("two");
 	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;
diff --git a/client/nonce2key/nonce2key.h b/client/nonce2key/nonce2key.h
index 45bbcea0..e8e2a01b 100644
--- a/client/nonce2key/nonce2key.h
+++ b/client/nonce2key/nonce2key.h
@@ -18,13 +18,13 @@
 #include <stdlib.h>
 #include "crapto1.h"
 #include "common.h"
-#include "mifare.h" // nonces_t struct
-#include "ui.h"
+#include "mifare.h" 	// nonces_t struct
+#include "ui.h"			// PrintAndLog
 #include "proxmark3.h"
 #include "mifarehost.h"
 
 extern int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key); 
-extern int nonce2key_ex(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint64_t * key);
+extern 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);
 
 //iceman, added these to be able to crack key direct from "hf 14 sim" && "hf mf sim"
 bool tryMfk32(nonces_t data, uint64_t *outputkey );