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https://github.com/RfidResearchGroup/proxmark3.git
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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
// Doegox, 2024, cf https://eprint.iacr.org/2024/1275 for more info
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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 nonce
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uint32_t nt_enc; // encrypted tag nonce
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uint32_t nr_enc; // encrypted reader nonce
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uint32_t ar; // reader response
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uint32_t ar_enc; // encrypted reader response
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uint32_t ks0; // keystream used to encrypt tag nonce
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uint32_t ks2; // keystream used to encrypt reader response
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printf("MIFARE Classic key recovery - known nT scenario\n");
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printf("Recover key from one reader authentication answer only\n");
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if (argc != 6) {
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printf("syntax: %s <uid> <nt> <{nt}> <{nr}> <{ar}>\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", &nt_enc);
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sscanf(argv[4], "%x", &nr_enc);
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sscanf(argv[5], "%x", &ar_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(" {nt}: %08x\n", nt_enc);
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printf(" {nr}: %08x\n", nr_enc);
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printf(" {ar}: %08x\n", ar_enc);
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printf("\nLFSR successor of the tag challenge:\n");
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ar = prng_successor(nt, 64);
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printf(" ar: %08x\n", ar);
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printf("\nKeystream used to generate {nt}:\n");
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ks0 = nt_enc ^ nt;
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printf(" ks0: %08x\n", ks0);
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printf("\nKeystream used to generate {ar}:\n");
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ks2 = ar_enc ^ ar;
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printf(" ks2: %08x\n", ks2);
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s = lfsr_recovery32(ks0, uid ^ nt);
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for (t = s; t->odd | t->even; ++t) {
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crypto1_word(t, nr_enc, 1);
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if (ks2 == crypto1_word(t, 0, 0)) {
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lfsr_rollback_word(t, 0, 0);
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lfsr_rollback_word(t, nr_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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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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