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72 lines
2.1 KiB
C
Executable file
72 lines
2.1 KiB
C
Executable file
#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#define llx PRIx64
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#define lli PRIi64
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// Test-file: test2.c
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#include "crapto1.h"
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#include <stdio.h>
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#include <stdlib.h>
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int main (int argc, char *argv[]) {
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struct Crypto1State *s,*t;
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uint64_t key; // recovered key
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uint32_t uid; // serial number
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uint32_t nt; // tag challenge
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uint32_t nr0_enc; // first encrypted reader challenge
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uint32_t ar0_enc; // first encrypted reader response
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uint32_t nr1_enc; // second encrypted reader challenge
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uint32_t ar1_enc; // second encrypted reader response
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uint32_t ks2; // keystream used to encrypt reader response
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printf("MIFARE Classic key recovery - based 32 bits of keystream\n");
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printf("Recover key from two 32-bit reader authentication answers only!\n\n");
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if (argc < 7) {
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printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar_0}> <{nr_1}> <{ar_1}>\n\n",argv[0]);
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return 1;
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}
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sscanf(argv[1],"%x",&uid);
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sscanf(argv[2],"%x",&nt);
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sscanf(argv[3],"%x",&nr0_enc);
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sscanf(argv[4],"%x",&ar0_enc);
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sscanf(argv[5],"%x",&nr1_enc);
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sscanf(argv[6],"%x",&ar1_enc);
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printf("Recovering key for:\n");
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printf(" uid: %08x\n",uid);
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printf(" nt: %08x\n",nt);
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printf(" {nr_0}: %08x\n",nr0_enc);
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printf(" {ar_0}: %08x\n",ar0_enc);
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printf(" {nr_1}: %08x\n",nr1_enc);
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printf(" {ar_1}: %08x\n",ar1_enc);
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// Generate lfsr succesors of the tag challenge
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printf("\nLFSR succesors of the tag challenge:\n");
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printf(" nt': %08x\n",prng_successor(nt, 64));
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printf(" nt'': %08x\n",prng_successor(nt, 96));
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// Extract the keystream from the messages
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printf("\nKeystream used to generate {ar} and {at}:\n");
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ks2 = ar0_enc ^ prng_successor(nt, 64);
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printf(" ks2: %08x\n",ks2);
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s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
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for(t = s; t->odd | t->even; ++t) {
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lfsr_rollback_word(t, 0, 0);
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lfsr_rollback_word(t, nr0_enc, 1);
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lfsr_rollback_word(t, uid ^ nt, 0);
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crypto1_get_lfsr(t, &key);
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crypto1_word(t, uid ^ nt, 0);
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crypto1_word(t, nr1_enc, 1);
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if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
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printf("\nFound Key: [%012"llx"]\n\n",key);
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break;
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}
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}
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free(s);
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return 0;
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}
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