]> git.zerfleddert.de Git - proxmark3-svn/blob - tools/nonce2key/nonce2key.c
Refactoring low frequency operations, now 'lf hid fskdemod' is more stable. Also...
[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 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"llx,&par_info);
24 sscanf(argv[4],"%016"llx,&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"llx") ks(%016"llx")\n\n",uid,nt,par_info,ks_info);
30
31 for (pos=0; pos<8; pos++)
32 {
33 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
34 bt = (par_info >> (pos*8)) & 0xff;
35 for (i=0; i<8; i++)
36 {
37 par[7-pos][i] = (bt >> i) & 0x01;
38 }
39 }
40
41 printf("|diff|{nr} |ks3|ks3^5|parity |\n");
42 printf("+----+--------+---+-----+---------------+\n");
43 for (i=0; i<8; i++)
44 {
45 nr_diff = nr | i << 5;
46 printf("| %02x |%08x|",i << 5, nr_diff);
47 printf(" %01x | %01x |",ks3x[i], ks3x[i]^5);
48 for (pos=0; pos<7; pos++) printf("%01x,",par[i][pos]);
49 printf("%01x|\n",par[i][7]);
50 }
51
52 state = lfsr_common_prefix(nr,rr,ks3x,par);
53 lfsr_rollback_word(state,uid^nt,0);
54 crypto1_get_lfsr(state,&key_recovered);
55 printf("\nkey recovered: %012"llx"\n\n",key_recovered);
56 crypto1_destroy(state);
57
58 return 0;
59 }
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