X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/c9ad641b61c6fc5e4b77b181ad9b58b8723f56c6..refs/pull/524/head:/tools/mfkey/mfkey32.c?ds=sidebyside diff --git a/tools/mfkey/mfkey32.c b/tools/mfkey/mfkey32.c index a018c5df..a5665ab2 100755 --- a/tools/mfkey/mfkey32.c +++ b/tools/mfkey/mfkey32.c @@ -1,67 +1,77 @@ #include <inttypes.h> -#include "crapto1/crapto1.h" +#include <stdbool.h> #include <stdio.h> #include <stdlib.h> +#include "crapto1/crapto1.h" +#include "mfkey.h" +#include "util_posix.h" + +// 32 bit recover key from 2 nonces int main (int argc, char *argv[]) { - struct Crypto1State *s,*t; - uint64_t key; // recovered key - uint32_t uid; // serial number - uint32_t nt; // tag challenge - uint32_t nr0_enc; // first encrypted reader challenge - uint32_t ar0_enc; // first encrypted reader response - uint32_t nr1_enc; // second encrypted reader challenge - uint32_t ar1_enc; // second encrypted reader response + + nonces_t data; uint32_t ks2; // keystream used to encrypt reader response + uint64_t key; // recovered key - printf("MIFARE Classic key recovery - based 32 bits of keystream\n"); + printf("MIFARE Classic key recovery - based on 32 bits of keystream\n"); printf("Recover key from two 32-bit reader authentication answers only!\n\n"); - if (argc < 7) { - printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar_0}> <{nr_1}> <{ar_1}>\n\n",argv[0]); + if (argc != 7 && argc != 8) { + printf(" syntax: %s <uid> <nt0> <{nr_0}> <{ar_0}> [<nt1>] <{nr_1}> <{ar_1}>\n", argv[0]); + printf(" (you may omit nt1 if it is equal to nt0)\n\n"); return 1; } - sscanf(argv[1],"%x",&uid); - sscanf(argv[2],"%x",&nt); - sscanf(argv[3],"%x",&nr0_enc); - sscanf(argv[4],"%x",&ar0_enc); - sscanf(argv[5],"%x",&nr1_enc); - sscanf(argv[6],"%x",&ar1_enc); + bool moebius_attack = (argc == 8); + + sscanf(argv[1],"%x",&data.cuid); + sscanf(argv[2],"%x",&data.nonce); + data.nonce2 = data.nonce; + sscanf(argv[3],"%x",&data.nr); + sscanf(argv[4],"%x",&data.ar); + if (moebius_attack) { + sscanf(argv[5],"%x",&data.nonce2); + sscanf(argv[6],"%x",&data.nr2); + sscanf(argv[7],"%x",&data.ar2); + } else { + sscanf(argv[5],"%x",&data.nr2); + sscanf(argv[6],"%x",&data.ar2); + } printf("Recovering key for:\n"); - printf(" uid: %08x\n",uid); - printf(" nt: %08x\n",nt); - printf(" {nr_0}: %08x\n",nr0_enc); - printf(" {ar_0}: %08x\n",ar0_enc); - printf(" {nr_1}: %08x\n",nr1_enc); - printf(" {ar_1}: %08x\n",ar1_enc); + printf(" uid: %08x\n",data.cuid); + printf(" nt0: %08x\n",data.nonce); + printf(" {nr_0}: %08x\n",data.nr); + printf(" {ar_0}: %08x\n",data.ar); + printf(" nt1: %08x\n",data.nonce2); + printf(" {nr_1}: %08x\n",data.nr2); + printf(" {ar_1}: %08x\n",data.ar2); + uint64_t start_time = msclock(); + // 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(" nt': %08x\n",prng_successor(data.nonce, 64)); + printf(" nt'': %08x\n",prng_successor(data.nonce, 96)); // Extract the keystream from the messages printf("\nKeystream used to generate {ar} and {at}:\n"); - ks2 = ar0_enc ^ prng_successor(nt, 64); + ks2 = data.ar ^ prng_successor(data.nonce, 64); printf(" ks2: %08x\n",ks2); - s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0); - - for(t = s; t->odd | t->even; ++t) { - lfsr_rollback_word(t, 0, 0); - lfsr_rollback_word(t, nr0_enc, 1); - lfsr_rollback_word(t, uid ^ nt, 0); - crypto1_get_lfsr(t, &key); - crypto1_word(t, uid ^ nt, 0); - crypto1_word(t, nr1_enc, 1); - if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) { - printf("\nFound Key: [%012" PRIx64 "]\n\n",key); - break; - } + bool success; + if (moebius_attack) { + success = mfkey32_moebius(data, &key); + } else { + success = mfkey32(data, &key); + } + + if (success) { + printf("Recovered key: %012" PRIx64 "\n", key); + } else { + printf("Couldn't recover key.\n"); } - free(s); - return 0; + printf("Time spent: %1.2f seconds\n", (float)(msclock() - start_time)/1000.0); }