mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-11 01:55:38 +08:00
107 lines
2.9 KiB
C
Executable file
107 lines
2.9 KiB
C
Executable file
#define __STDC_FORMAT_MACROS
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <inttypes.h>
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#include "crapto1.h"
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#define llx PRIx64
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#define lli PRIi64
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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, "%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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// Generate lfsr succesors of the tag challenge
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printf("\nLFSR succesors 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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clock_t t1 = clock();
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// Extract the keystream from the messages
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printf("\nKeystream used to generate {ar} and {at}:\n");
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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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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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// 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"llx"]\n\n", key);
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crypto1_destroy(revstate);
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t1 = clock() - t1;
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if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1);
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return 0;
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}
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