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https://github.com/RfidResearchGroup/proxmark3.git
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70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "crapto1/crapto1.h"
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#include "util_posix.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 on 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 successors of the tag challenge
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printf("\nLFSR successors of the tag challenge:\n");
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uint32_t p64 = prng_successor(nt, 64);
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printf(" nt': %08x\n", p64);
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printf(" nt'': %08x\n", prng_successor(p64, 32));
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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 ^ p64;
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printf(" ks2: %08x\n", ks2);
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s = lfsr_recovery32(ar0_enc ^ p64, 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) ^ p64)) {
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printf("\nFound Key: [%012" PRIx64 "]\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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