mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-20 23:36:31 +08:00
101 lines
3.1 KiB
C
Executable file
101 lines
3.1 KiB
C
Executable file
#define __STDC_FORMAT_MACROS
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <inttypes.h>
|
|
#include "crapto1.h"
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct Crypto1State *revstate;
|
|
uint64_t key; // recovered key
|
|
uint32_t uid; // serial number
|
|
uint32_t nt; // tag challenge
|
|
uint32_t nr_enc; // encrypted reader challenge
|
|
uint32_t ar_enc; // encrypted reader response
|
|
uint32_t at_enc; // encrypted tag response
|
|
uint32_t ks2; // keystream used to encrypt reader response
|
|
uint32_t ks3; // keystream used to encrypt tag response
|
|
|
|
printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
|
|
printf("Recover key from only one complete authentication!\n\n");
|
|
|
|
if (argc < 6) {
|
|
printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc...]\n\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
int encc = argc - 6;
|
|
int enclen[encc];
|
|
uint8_t enc[encc][120];
|
|
|
|
sscanf(argv[1], "%x", &uid);
|
|
sscanf(argv[2], "%x", &nt);
|
|
sscanf(argv[3], "%x", &nr_enc);
|
|
sscanf(argv[4], "%x", &ar_enc);
|
|
sscanf(argv[5], "%x", &at_enc);
|
|
for (int i = 0; i < encc; i++) {
|
|
enclen[i] = strlen(argv[i + 6]) / 2;
|
|
for (int i2 = 0; i2 < enclen[i]; i2++) {
|
|
sscanf(argv[i + 6] + i2 * 2, "%2x", (unsigned int *)&enc[i][i2]);
|
|
}
|
|
}
|
|
|
|
printf("Recovering key for:\n");
|
|
|
|
printf(" uid: %08x\n", uid);
|
|
printf(" nt: %08x\n", nt);
|
|
printf(" {nr}: %08x\n", nr_enc);
|
|
printf(" {ar}: %08x\n", ar_enc);
|
|
printf(" {at}: %08x\n", at_enc);
|
|
|
|
for (int i = 0; i < encc; i++) {
|
|
printf("{enc%d}: ", i);
|
|
for (int i2 = 0; i2 < enclen[i]; i2++) {
|
|
printf("%02x", enc[i][i2]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
// Generate lfsr succesors of the tag challenge
|
|
printf("\nLFSR succesors of the tag challenge:\n");
|
|
printf(" nt': %08x\n", prng_successor(nt, 64));
|
|
printf(" nt'': %08x\n", prng_successor(nt, 96));
|
|
|
|
// Extract the keystream from the messages
|
|
printf("\nKeystream used to generate {ar} and {at}:\n");
|
|
ks2 = ar_enc ^ prng_successor(nt, 64);
|
|
ks3 = at_enc ^ prng_successor(nt, 96);
|
|
printf(" ks2: %08x\n", ks2);
|
|
printf(" ks3: %08x\n", ks3);
|
|
|
|
revstate = lfsr_recovery64(ks2, ks3);
|
|
|
|
// Decrypting communication using keystream if presented
|
|
if (argc > 6) {
|
|
printf("\nDecrypted communication:\n");
|
|
uint8_t ks4;
|
|
int rollb = 0;
|
|
for (int i = 0; i < encc; i++) {
|
|
printf("{dec%d}: ", i);
|
|
for (int i2 = 0; i2 < enclen[i]; i2++) {
|
|
ks4 = crypto1_byte(revstate, 0, 0);
|
|
printf("%02x", ks4 ^ enc[i][i2]);
|
|
rollb += 1;
|
|
}
|
|
printf("\n");
|
|
}
|
|
for (int i = 0; i < rollb; i++)
|
|
lfsr_rollback_byte(revstate, 0, 0);
|
|
}
|
|
|
|
lfsr_rollback_word(revstate, 0, 0);
|
|
lfsr_rollback_word(revstate, 0, 0);
|
|
lfsr_rollback_word(revstate, nr_enc, 1);
|
|
lfsr_rollback_word(revstate, uid ^ nt, 0);
|
|
crypto1_get_lfsr(revstate, &key);
|
|
printf("\nFound Key: [%012" PRIx64 "]\n\n", key);
|
|
crypto1_destroy(revstate);
|
|
return 0;
|
|
}
|