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https://github.com/RfidResearchGroup/proxmark3.git
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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include "crapto1.h"
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#define llx PRIx64
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#include <stdio.h>
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typedef unsigned char byte_t;
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int main(const int argc, const char* argv[]) {
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struct Crypto1State *state;
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uint32_t pos, uid, nt, nr, rr, nr_diff, ks1, ks2;
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byte_t bt, i, ks3x[8], par[8][8];
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uint64_t key, key_recovered;
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uint64_t par_info;
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uint64_t ks_info;
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nr = rr = 0;
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if (argc < 5) {
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printf("\nsyntax: %s <uid> <nt> <par> <ks>\n\n",argv[0]);
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return 1;
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}
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sscanf(argv[1],"%08x",&uid);
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sscanf(argv[2],"%08x",&nt);
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sscanf(argv[3],"%016"llx,&par_info);
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sscanf(argv[4],"%016"llx,&ks_info);
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// Reset the last three significant bits of the reader nonce
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nr &= 0xffffff1f;
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printf("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx")\n\n",uid,nt,par_info,ks_info);
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for (pos=0; pos<8; pos++)
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{
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ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
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bt = (par_info >> (pos*8)) & 0xff;
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for (i=0; i<8; i++)
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{
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par[7-pos][i] = (bt >> i) & 0x01;
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}
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}
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printf("|diff|{nr} |ks3|ks3^5|parity |\n");
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printf("+----+--------+---+-----+---------------+\n");
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for (i=0; i<8; i++)
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{
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nr_diff = nr | i << 5;
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printf("| %02x |%08x|",i << 5, nr_diff);
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printf(" %01x | %01x |",ks3x[i], ks3x[i]^5);
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for (pos=0; pos<7; pos++) printf("%01x,",par[i][pos]);
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printf("%01x|\n",par[i][7]);
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}
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state = lfsr_common_prefix(nr,rr,ks3x,par);
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lfsr_rollback_word(state,uid^nt,0);
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crypto1_get_lfsr(state,&key_recovered);
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printf("\nkey recovered: %012"llx"\n\n",key_recovered);
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crypto1_destroy(state);
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return 0;
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}
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