X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3d057cfb918fb7e296cd27d6ced98008ea967753..fdd9395d1a0f331f9cc74d6cdd6dd71447524e6c:/client/mifare/mfkey.c

diff --git a/client/mifare/mfkey.c b/client/mifare/mfkey.c
new file mode 100644
index 00000000..0c72a37c
--- /dev/null
+++ b/client/mifare/mfkey.c
@@ -0,0 +1,122 @@
+//-----------------------------------------------------------------------------
+// Merlok - June 2011
+// Roel - Dec 2009
+// Unknown author
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// MIFARE Darkside hack
+//-----------------------------------------------------------------------------
+
+#include "mfkey.h"
+
+#include "mifare.h"
+#include "crapto1/crapto1.h"
+
+
+// recover key from 2 different reader responses on same tag challenge
+bool mfkey32(nonces_t data, uint64_t *outputkey) {
+	struct Crypto1State *s,*t;
+	uint64_t outkey = 0;
+	uint64_t key = 0;     // recovered key
+	bool isSuccess = false;
+	uint8_t counter = 0;
+
+	s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
+
+	for(t = s; t->odd | t->even; ++t) {
+		lfsr_rollback_word(t, 0, 0);
+		lfsr_rollback_word(t, data.nr, 1);
+		lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
+		crypto1_get_lfsr(t, &key);
+		crypto1_word(t, data.cuid ^ data.nonce, 0);
+		crypto1_word(t, data.nr2, 1);
+		if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
+			//PrintAndLog("Found Key: [%012" PRIx64 "]",key);
+			outkey = key;
+			counter++;
+			if (counter == 20) break;
+		}
+	}
+	isSuccess = (counter == 1);
+	*outputkey = ( isSuccess ) ? outkey : 0;
+	crypto1_destroy(s);
+	/* //un-comment to save all keys to a stats.txt file 
+	FILE *fout;
+	if ((fout = fopen("stats.txt","ab")) == NULL) { 
+		PrintAndLog("Could not create file name stats.txt");
+		return 1;
+	}
+	fprintf(fout, "mfkey32,%d,%08x,%d,%s,%04x%08x,%.0Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t)(outkey>>32) & 0xFFFF,(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
+	fclose(fout);
+	*/
+	return isSuccess;
+}
+
+// recover key from 2 reader responses on 2 different tag challenges
+bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
+	struct Crypto1State *s, *t;
+	uint64_t outkey  = 0;
+	uint64_t key 	   = 0;			// recovered key
+	bool isSuccess = false;
+	int counter = 0;
+	
+	s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
+  
+	for(t = s; t->odd | t->even; ++t) {
+		lfsr_rollback_word(t, 0, 0);
+		lfsr_rollback_word(t, data.nr, 1);
+		lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
+		crypto1_get_lfsr(t, &key);
+		
+		crypto1_word(t, data.cuid ^ data.nonce2, 0);
+		crypto1_word(t, data.nr2, 1);
+		if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
+			//PrintAndLog("Found Key: [%012" PRIx64 "]",key);
+			outkey=key;
+			++counter;
+			if (counter==20)
+				break;
+		}
+	}
+	isSuccess	= (counter == 1);
+	*outputkey = ( isSuccess ) ? outkey : 0;
+	crypto1_destroy(s);
+	/* // un-comment to output all keys to stats.txt
+	FILE *fout;
+	if ((fout = fopen("stats.txt","ab")) == NULL) { 
+		PrintAndLog("Could not create file name stats.txt");
+		return 1;
+	}
+	fprintf(fout, "moebius,%d,%08x,%d,%s,%04x%08x,%0.Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t) (outkey>>32),(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
+	fclose(fout);
+	*/
+	return isSuccess;
+}
+
+// recover key from reader response and tag response of one authentication sequence
+int mfkey64(nonces_t data, 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
+	struct Crypto1State *revstate;
+	
+	// Extract the keystream from the messages
+	ks2 = data.ar ^ prng_successor(data.nonce, 64);
+	ks3 = data.at ^ prng_successor(data.nonce, 96);
+	revstate = lfsr_recovery64(ks2, ks3);
+	lfsr_rollback_word(revstate, 0, 0);
+	lfsr_rollback_word(revstate, 0, 0);
+	lfsr_rollback_word(revstate, data.nr, 1);
+	lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
+	crypto1_get_lfsr(revstate, &key);
+	// PrintAndLog("Found Key: [%012" PRIx64 "]", key);
+	crypto1_destroy(revstate);
+	*outputkey = key;
+	
+	return 0;
+}
+
+