mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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109 lines
3.3 KiB
C
109 lines
3.3 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 <string.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 *revstate;
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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 nr_enc; // encrypted reader challenge
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uint32_t ar_enc; // encrypted reader response
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uint32_t at_enc; // encrypted tag response
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uint32_t ks2; // keystream used to encrypt reader response
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uint32_t ks3; // keystream used to encrypt tag response
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printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
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printf("Recover key from only one complete authentication!\n\n");
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if (argc < 6) {
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printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc...]\n\n", argv[0]);
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return 1;
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}
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int encc = argc - 6;
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int enclen[encc];
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uint8_t enc[encc][120];
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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", &nr_enc);
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sscanf(argv[4], "%x", &ar_enc);
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sscanf(argv[5], "%x", &at_enc);
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for (int i = 0; i < encc; i++) {
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enclen[i] = strlen(argv[i + 6]) / 2;
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for (int i2 = 0; i2 < enclen[i]; i2++) {
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sscanf(argv[i + 6] + i2 * 2, "%2hhx", &enc[i][i2]);
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}
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}
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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}: %08x\n", nr_enc);
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printf(" {ar}: %08x\n", ar_enc);
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printf(" {at}: %08x\n", at_enc);
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for (int i = 0; i < encc; i++) {
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printf("{enc%d}: ", i);
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for (int i2 = 0; i2 < enclen[i]; i2++) {
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printf("%02x", enc[i][i2]);
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}
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printf("\n");
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}
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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 ar = prng_successor(nt, 64);
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uint32_t at = prng_successor(ar, 32);
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printf(" ar: %08x\n", ar);
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printf(" at: %08x\n", at);
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// Extract the keystream from the messages
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printf("\nKeystreams used to generate {ar} and {at}:\n");
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ks2 = ar_enc ^ ar;
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ks3 = at_enc ^ at;
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printf(" ks2: %08x\n", ks2);
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printf(" ks3: %08x\n", ks3);
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revstate = lfsr_recovery64(ks2, ks3);
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if ((revstate->odd == 0) && (revstate->even == 0)) {
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printf("\nKey not found :(\n\n");
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crypto1_destroy(revstate);
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return -1;
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}
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// Decrypting communication using keystream if presented
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if (argc > 6) {
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printf("\nDecrypted communication:\n");
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uint8_t ks4;
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int rollb = 0;
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for (int i = 0; i < encc; i++) {
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printf("{dec%d}: ", i);
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for (int i2 = 0; i2 < enclen[i]; i2++) {
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ks4 = crypto1_byte(revstate, 0, 0);
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printf("%02x", ks4 ^ enc[i][i2]);
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rollb += 1;
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}
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printf("\n");
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}
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for (int i = 0; i < rollb; i++)
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lfsr_rollback_byte(revstate, 0, 0);
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}
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, nr_enc, 1);
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lfsr_rollback_word(revstate, uid ^ nt, 0);
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crypto1_get_lfsr(revstate, &key);
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printf("\nFound Key: [%012" PRIx64 "]\n\n", key);
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crypto1_destroy(revstate);
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return 0;
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}
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