X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/660d641a03456e99ea83c68dbd3d03bae2b64573..a1ab594e244c1554b2e997efa8813e8ec3b80017:/tools/mfkey/mfkey64.c

diff --git a/tools/mfkey/mfkey64.c b/tools/mfkey/mfkey64.c
index 448cb2ac..616c6f3d 100755
--- a/tools/mfkey/mfkey64.c
+++ b/tools/mfkey/mfkey64.c
@@ -1,71 +1,107 @@
 #define __STDC_FORMAT_MACROS
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
 #include <inttypes.h>
+#include "crapto1.h"
+
 #define llx PRIx64
 #define lli PRIi64
 
-// Test-file: test2.c
-#include "crapto1.h"
-#include <stdio.h>
-
 int main (int argc, char *argv[]) {
-  struct Crypto1State *revstate;
-  uint64_t key;     // recovered key
-  uint32_t uid;     // serial number
-  uint32_t nt;      // tag challenge
-  uint32_t nr_enc;  // encrypted reader challenge
-  uint32_t ar_enc;  // encrypted reader response
-  uint32_t at_enc;  // encrypted tag response
-  uint32_t ks2;     // keystream used to encrypt reader response
-  uint32_t ks3;     // keystream used to encrypt tag response
+	struct Crypto1State *revstate;
+	uint64_t key;     // recovered key
+	uint32_t uid;     // serial number
+	uint32_t nt;      // tag challenge
+	uint32_t nr_enc;  // encrypted reader challenge
+	uint32_t ar_enc;  // encrypted reader response
+	uint32_t at_enc;  // encrypted tag response
+	uint32_t ks2;     // keystream used to encrypt reader response
+	uint32_t ks3;     // keystream used to encrypt tag response
 
-  printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
-  printf("Recover key from only one complete authentication!\n\n");
+	printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
+	printf("Recover key from only one complete authentication!\n\n");
 
-  if (argc < 6) {
-    printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
-    return 1;
-  }
+	if (argc < 6) {
+		printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc...]\n\n", argv[0]);
+		return 1;
+	}
 
-  sscanf(argv[1],"%x",&uid);
-  sscanf(argv[2],"%x",&nt);
-  sscanf(argv[3],"%x",&nr_enc);
-  sscanf(argv[4],"%x",&ar_enc);
-  sscanf(argv[5],"%x",&at_enc);
+	int encc = argc - 6;
+	int enclen[encc];
+	uint8_t enc[encc][120]; 
 
-  printf("Recovering key for:\n");
-  printf("  uid: %08x\n",uid);
-  printf("   nt: %08x\n",nt);
-  printf(" {nr}: %08x\n",nr_enc);
-  printf(" {ar}: %08x\n",ar_enc);
-  printf(" {at}: %08x\n",at_enc);
+	sscanf(argv[1],"%x",&uid);
+	sscanf(argv[2],"%x",&nt);
+	sscanf(argv[3],"%x",&nr_enc);
+	sscanf(argv[4],"%x",&ar_enc);
+	sscanf(argv[5],"%x",&at_enc);
+	for (int i = 0; i < encc; i++) {
+		enclen[i] = strlen(argv[i + 6]) / 2;
+		for (int i2 = 0; i2 < enclen[i]; i2++) {
+			sscanf(argv[i+6] + i2*2, "%2x", (unsigned int *)&enc[i][i2]);
+		}
+	}
+	
+	printf("Recovering key for:\n");
 
-/*	
-  uint32_t uid                = 0x9c599b32;
-  uint32_t tag_challenge      = 0x82a4166c;
-  uint32_t nr_enc             = 0xa1e458ce;
-  uint32_t reader_response    = 0x6eea41e0;
-  uint32_t tag_response       = 0x5cadf439;
-*/
-	// Generate lfsr succesors of the tag challenge
-  printf("\nLFSR succesors of the tag challenge:\n");
-  printf("  nt': %08x\n",prng_successor(nt, 64));
-  printf(" nt'': %08x\n",prng_successor(nt, 96));
+	printf("  uid: %08x\n",uid);
+	printf("   nt: %08x\n",nt);
+	printf(" {nr}: %08x\n",nr_enc);
+	printf(" {ar}: %08x\n",ar_enc);
+	printf(" {at}: %08x\n",at_enc);
 
-  // Extract the keystream from the messages
-  printf("\nKeystream used to generate {ar} and {at}:\n");
-  ks2 = ar_enc ^ prng_successor(nt, 64);
-  ks3 = at_enc ^ prng_successor(nt, 96);
-  printf("  ks2: %08x\n",ks2);
-  printf("  ks3: %08x\n",ks3);
+	for (int i = 0; i < encc; i++) {
+		printf("{enc%d}: ", i);
+		for (int i2 = 0; i2 < enclen[i]; i2++) {
+			printf("%02x", enc[i][i2]);
+		}
+		printf("\n");
+	}
+
+	// Generate lfsr succesors of the tag challenge
+	printf("\nLFSR succesors of the tag challenge:\n");
+	printf("  nt': %08x\n",prng_successor(nt, 64));
+	printf(" nt'': %08x\n",prng_successor(nt, 96));
+	
+	clock_t t1 = clock();
+	
+	// Extract the keystream from the messages
+	printf("\nKeystream used to generate {ar} and {at}:\n");
+	ks2 = ar_enc ^ prng_successor(nt, 64);
+	ks3 = at_enc ^ prng_successor(nt, 96);
+	printf("  ks2: %08x\n",ks2);
+	printf("  ks3: %08x\n",ks3);
 
-  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);
-  printf("\nFound Key: [%012"llx"]\n\n",key);
-  crypto1_destroy(revstate);
+	revstate = lfsr_recovery64(ks2, ks3);
 
-  return 0;
+	// Decrypting communication using keystream if presented
+	if (argc > 6 ) {
+		printf("\nDecrypted communication:\n");
+		uint8_t ks4; 
+		int rollb = 0;
+		for (int i = 0; i < encc; i++) {
+			printf("{dec%d}: ", i);
+			for (int i2 = 0; i2 < enclen[i]; i2++) {  
+				ks4 = crypto1_byte(revstate, 0, 0);
+				printf("%02x", ks4 ^ enc[i][i2]);
+				rollb += 1;
+			}
+			printf("\n");
+		}
+		for (int i = 0; i < rollb; i++)
+			lfsr_rollback_byte(revstate, 0, 0);
+	}
+  
+	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);
+	printf("\nFound Key: [%012"llx"]\n\n", key);
+	crypto1_destroy(revstate);
+  
+	t1 = clock() - t1;
+	if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1);
+	return 0;
 }