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[proxmark3-svn] / tools / nonce2key / nonce2key.c
1 #include "crapto1.h"
2 #define __STDC_FORMAT_MACROS
3 #include <inttypes.h>
4 #define llx PRIx64
5 #include <stdio.h>
6 #include <time.h>
7 typedef unsigned char byte_t;
8
9 int main(const int argc, const char* argv[]) {
10 struct Crypto1State *state;
11 uint32_t pos, uid, nt, nr, rr, nr_diff, ks1, ks2;
12 byte_t bt, i, ks3x[8], par[8][8];
13 uint64_t key, key_recovered;
14 uint64_t par_info;
15 uint64_t ks_info;
16 nr = rr = 0;
17
18 if (argc < 5) {
19 printf("\nsyntax: %s <uid> <nt> <par> <ks>\n\n",argv[0]);
20 return 1;
21 }
22 sscanf(argv[1],"%08x",&uid);
23 sscanf(argv[2],"%08x",&nt);
24 sscanf(argv[3],"%016"llx,&par_info);
25 sscanf(argv[4],"%016"llx,&ks_info);
26
27 // Reset the last three significant bits of the reader nonce
28 nr &= 0xffffff1f;
29
30 printf("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx")\n\n",uid,nt,par_info,ks_info);
31
32 for ( pos = 0; pos < 8; pos++ ) {
33 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
34 bt = (par_info >> (pos*8)) & 0xff;
35
36 for ( i = 0; i < 8; i++) {
37 par[7-pos][i] = (bt >> i) & 0x01;
38 }
39 }
40
41 printf("|diff|{nr} |ks3|ks3^5|parity |\n");
42 printf("+----+--------+---+-----+---------------+\n");
43
44 for ( i = 0; i < 8; i++) {
45 nr_diff = nr | i << 5;
46 printf("| %02x |%08x| %01x | %01x |", i << 5, nr_diff, ks3x[i], ks3x[i]^5);
47
48 for ( pos = 0; pos < 7; pos++)
49 printf("%01x,", par[i][pos]);
50 printf("%01x|\n", par[i][7]);
51 }
52 printf("+----+--------+---+-----+---------------+\n");
53
54 clock_t t1 = clock();
55
56 state = lfsr_common_prefix(nr,rr,ks3x,par);
57 lfsr_rollback_word(state,uid^nt,0);
58 crypto1_get_lfsr(state,&key_recovered);
59 printf("\nkey recovered: %012"llx"\n\n",key_recovered);
60 crypto1_destroy(state);
61
62 t1 = clock() - t1;
63 if ( t1 > 0 ) printf("Time in nonce2key: %.0f ticks \n", (float)t1);
64 return 0;
65 }
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