#define __STDC_FORMAT_MACROS
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
#include <inttypes.h>
+#include "crapto1.h"
+
#define llx PRIx64
#define lli PRIi64
-// Test-file: test2.c
-#include "crapto1.h"
-#include <stdio.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
+ 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");
+ 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}>\n\n",argv[0]);
- return 1;
- }
+ if (argc < 6) {
+ printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc...]\n\n", argv[0]);
+ return 1;
+ }
- 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);
+ int encc = argc - 6;
+ int enclen[encc];
+ uint8_t enc[encc][120];
- 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);
+ 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");
-/*
- uint32_t uid = 0x9c599b32;
- uint32_t tag_challenge = 0x82a4166c;
- uint32_t nr_enc = 0xa1e458ce;
- uint32_t reader_response = 0x6eea41e0;
- uint32_t tag_response = 0x5cadf439;
-*/
- // 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));
+ 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);
- // 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);
+ 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));
+
+ clock_t t1 = clock();
+
+ // 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);
- 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"llx"]\n\n",key);
- crypto1_destroy(revstate);
+ revstate = lfsr_recovery64(ks2, ks3);
- return 0;
+ // 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"llx"]\n\n", key);
+ crypto1_destroy(revstate);
+
+ t1 = clock() - t1;
+ if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1);
+ return 0;
}
projects / proxmark3-svn / blobdiff