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chg: @piwi's code cleanup and some more.
[proxmark3-svn] / tools / nonce2key / nonce2key.c
1 #include "crapto1.h"
2 #define __STDC_FORMAT_MACROS
3 #include <inttypes.h>
4 #include <stdio.h>
5 #include <time.h>
6 typedef unsigned char byte_t;
7
8 int main(const int argc, const char* argv[]) {
9 struct Crypto1State *state;
10 uint32_t pos, uid, nt, nr, rr, nr_diff, ks1, ks2;
11 byte_t bt, i, ks3x[8], par[8][8];
12 uint64_t key, key_recovered;
13 uint64_t par_info;
14 uint64_t ks_info;
15 nr = rr = 0;
16
17 if (argc < 5) {
18 printf("\nsyntax: %s <uid> <nt> <par> <ks>\n\n",argv[0]);
19 return 1;
20 }
21 sscanf(argv[1],"%08x", &uid);
22 sscanf(argv[2],"%08x", &nt);
23 sscanf(argv[3],"%016" SCNx64 ,&par_info);
24 sscanf(argv[4],"%016" SCNx64 ,&ks_info);
25
26 // Reset the last three significant bits of the reader nonce
27 nr &= 0xffffff1f;
28
29 printf("\nuid(%08x) nt(%08x) par(%016" PRIx64 ") ks(%016" PRIx64 ")\n\n", uid, nt, par_info, ks_info);
30
31 for ( pos = 0; pos < 8; pos++ ) {
32 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
33 bt = (par_info >> (pos*8)) & 0xff;
34
35 for ( i = 0; i < 8; i++) {
36 par[7-pos][i] = (bt >> i) & 0x01;
37 }
38 }
39
40 printf("|diff|{nr} |ks3|ks3^5|parity |\n");
41 printf("+----+--------+---+-----+---------------+\n");
42
43 for ( i = 0; i < 8; i++) {
44 nr_diff = nr | i << 5;
45 printf("| %02x |%08x| %01x | %01x |", i << 5, nr_diff, ks3x[i], ks3x[i]^5);
46
47 for ( pos = 0; pos < 7; pos++)
48 printf("%01x,", par[i][pos]);
49 printf("%01x|\n", par[i][7]);
50 }
51 printf("+----+--------+---+-----+---------------+\n");
52
53 clock_t t1 = clock();
54
55 state = lfsr_common_prefix(nr,rr,ks3x,par);
56 lfsr_rollback_word(state,uid^nt,0);
57 crypto1_get_lfsr(state,&key_recovered);
58 printf("\nkey recovered: %012" PRIx64 "\n\n", key_recovered);
59 crypto1_destroy(state);
60
61 t1 = clock() - t1;
62 if ( t1 > 0 ) printf("Time in nonce2key: %.0f ticks \n", (float)t1);
63 return 0;
64 }
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