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https://github.com/Proxmark/proxmark3.git
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ec9c71129f
* Fix compile errors with MacOS - _POSIX_C_SOURCE must not be defined for num_CPU() * separate util_posix.c require changes in tools directory as well * remove unnecessary self-include
101 lines
2.9 KiB
C
Executable file
101 lines
2.9 KiB
C
Executable file
#include <stdio.h>
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#include <string.h>
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#include <inttypes.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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{
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uint32_t uid; // serial numDber
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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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uint64_t key = 0; // recovered key
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struct Crypto1State *revstate;
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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 on 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] [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,"%2x", (unsigned int*)&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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printf("\nLFSR successors of the tag challenge:\n");
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printf(" nt' : %08x\n",prng_successor(nt, 64));
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printf(" nt'': %08x\n",prng_successor(nt, 96));
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// Extract the keystream from the messages
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ks2 = ar_enc ^ prng_successor(nt, 64);
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ks3 = at_enc ^ prng_successor(nt, 96);
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uint64_t start_time = msclock();
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revstate = lfsr_recovery64(ks2, ks3);
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uint64_t time_spent = msclock() - start_time;
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printf("Time spent in lfsr_recovery64(): %1.2f seconds\n", (float)time_spent/1000.0);
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printf("\nKeystream used to generate {ar} and {at}:\n");
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printf(" ks2: %08x\n",ks2);
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printf(" ks3: %08x\n",ks3);
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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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}
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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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crypto1_destroy(revstate);
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printf("\nFound Key: [%012" PRIx64"]\n\n",key);
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}
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