X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/bd2797de1538c58232cffd8ec04a23fea23114f9..4cb4b588c276f8d3c3b4a18dc292d3bfd0e497b9:/tools/mfkey/mfkey64.c diff --git a/tools/mfkey/mfkey64.c b/tools/mfkey/mfkey64.c index 4b9b29ee..4e9876c5 100755 --- a/tools/mfkey/mfkey64.c +++ b/tools/mfkey/mfkey64.c @@ -1,105 +1,101 @@ +#include +#include #include #include "crapto1/crapto1.h" -#include -#include - -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 +#include "util.h" - printf("MIFARE Classic key recovery - based 64 bits of keystream\n"); - printf("Recover key from only one complete authentication!\n\n"); +int main (int argc, char *argv[]) +{ + uint32_t uid; // serial numDber + 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 + uint64_t key = 0; // recovered key + struct Crypto1State *revstate; + uint32_t ks2; // keystream used to encrypt reader response + uint32_t ks3; // keystream used to encrypt tag response - if (argc < 6 ) { - printf(" syntax: %s <{nr}> <{ar}> <{at}> [enc] [enc...]\n\n", argv[0]); - return 1; - } + printf("MIFARE Classic key recovery - based on 64 bits of keystream\n"); + printf("Recover key from only one complete authentication!\n\n"); - int encc = argc - 6; - int enclen[encc]; - uint8_t enc[encc][120]; + if (argc < 6 ) { + printf(" syntax: %s <{nr}> <{ar}> <{at}> [enc] [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); - 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"); + int encc = argc - 6; + int enclen[encc]; + uint8_t enc[encc][120]; - 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"); - } + 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"); + } - /* - 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("\nLFSR successors 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); + // Extract the keystream from the messages + ks2 = ar_enc ^ prng_successor(nt, 64); + ks3 = at_enc ^ prng_successor(nt, 96); + + uint64_t start_time = msclock(); + revstate = lfsr_recovery64(ks2, ks3); + uint64_t time_spent = msclock() - start_time; + printf("Time spent in lfsr_recovery64(): %1.2f seconds\n", (float)time_spent/1000.0); + printf("\nKeystream used to generate {ar} and {at}:\n"); + 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); + } + } - // 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); + 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); + crypto1_destroy(revstate); - return 0; + printf("\nFound Key: [%012" PRIx64"]\n\n",key); + }