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Commit	Line	Data
	1	//-----------------------------------------------------------------------------
	2	// Merlok - June 2011
	3	// Roel - Dec 2009
	4	// Unknown author
	5	//
	6	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	7	// at your option, any later version. See the LICENSE.txt file for the text of
	8	// the license.
	9	//-----------------------------------------------------------------------------
	10	// MIFARE Darkside hack
	11	//-----------------------------------------------------------------------------
	12
	13	#include "mfkey.h"
	14
	15	#include "mifare.h"
	16	#include "crapto1/crapto1.h"
	17
	18
	19	// recover key from 2 different reader responses on same tag challenge
	20	bool mfkey32(nonces_t data, uint64_t *outputkey) {
	21	struct Crypto1State s,t;
	22	uint64_t outkey = 0;
	23	uint64_t key = 0; // recovered key
	24	bool isSuccess = false;
	25	uint8_t counter = 0;
	26
	27	s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
	28
	29	for(t = s; t->odd \| t->even; ++t) {
	30	lfsr_rollback_word(t, 0, 0);
	31	lfsr_rollback_word(t, data.nr, 1);
	32	lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
	33	crypto1_get_lfsr(t, &key);
	34	crypto1_word(t, data.cuid ^ data.nonce, 0);
	35	crypto1_word(t, data.nr2, 1);
	36	if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
	37	//PrintAndLog("Found Key: [%012" PRIx64 "]",key);
	38	outkey = key;
	39	counter++;
	40	if (counter == 20) break;
	41	}
	42	}
	43	isSuccess = (counter == 1);
	44	*outputkey = ( isSuccess ) ? outkey : 0;
	45	crypto1_destroy(s);
	46	/* //un-comment to save all keys to a stats.txt file
	47	FILE *fout;
	48	if ((fout = fopen("stats.txt","ab")) == NULL) {
	49	PrintAndLog("Could not create file name stats.txt");
	50	return 1;
	51	}
	52	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);
	53	fclose(fout);
	54	*/
	55	return isSuccess;
	56	}
	57
	58	// recover key from 2 reader responses on 2 different tag challenges
	59	bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
	60	struct Crypto1State s, t;
	61	uint64_t outkey = 0;
	62	uint64_t key = 0; // recovered key
	63	bool isSuccess = false;
	64	int counter = 0;
	65
	66	s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
	67
	68	for(t = s; t->odd \| t->even; ++t) {
	69	lfsr_rollback_word(t, 0, 0);
	70	lfsr_rollback_word(t, data.nr, 1);
	71	lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
	72	crypto1_get_lfsr(t, &key);
	73
	74	crypto1_word(t, data.cuid ^ data.nonce2, 0);
	75	crypto1_word(t, data.nr2, 1);
	76	if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
	77	//PrintAndLog("Found Key: [%012" PRIx64 "]",key);
	78	outkey=key;
	79	++counter;
	80	if (counter==20)
	81	break;
	82	}
	83	}
	84	isSuccess = (counter == 1);
	85	*outputkey = ( isSuccess ) ? outkey : 0;
	86	crypto1_destroy(s);
	87	/* // un-comment to output all keys to stats.txt
	88	FILE *fout;
	89	if ((fout = fopen("stats.txt","ab")) == NULL) {
	90	PrintAndLog("Could not create file name stats.txt");
	91	return 1;
	92	}
	93	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);
	94	fclose(fout);
	95	*/
	96	return isSuccess;
	97	}
	98
	99	// recover key from reader response and tag response of one authentication sequence
	100	int mfkey64(nonces_t data, uint64_t *outputkey){
	101	uint64_t key = 0; // recovered key
	102	uint32_t ks2; // keystream used to encrypt reader response
	103	uint32_t ks3; // keystream used to encrypt tag response
	104	struct Crypto1State *revstate;
	105
	106	// Extract the keystream from the messages
	107	ks2 = data.ar ^ prng_successor(data.nonce, 64);
	108	ks3 = data.at ^ prng_successor(data.nonce, 96);
	109	revstate = lfsr_recovery64(ks2, ks3);
	110	lfsr_rollback_word(revstate, 0, 0);
	111	lfsr_rollback_word(revstate, 0, 0);
	112	lfsr_rollback_word(revstate, data.nr, 1);
	113	lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
	114	crypto1_get_lfsr(revstate, &key);
	115	// PrintAndLog("Found Key: [%012" PRIx64 "]", key);
	116	crypto1_destroy(revstate);
	117	*outputkey = key;
	118
	119	return 0;
	120	}
	121
	122