X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/660d641a03456e99ea83c68dbd3d03bae2b64573..9c624f67b3c3041d171abf75d954ba9fa0ae57a4:/tools/mfkey/mfkey64.c diff --git a/tools/mfkey/mfkey64.c b/tools/mfkey/mfkey64.c index 448cb2ac..6a7e78c0 100755 --- a/tools/mfkey/mfkey64.c +++ b/tools/mfkey/mfkey64.c @@ -1,71 +1,104 @@ #define __STDC_FORMAT_MACROS +#include +#include +#include #include -#define llx PRIx64 -#define lli PRIi64 - -// Test-file: test2.c #include "crapto1.h" -#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 + 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 <{nr}> <{ar}> <{at}>\n\n",argv[0]); - return 1; - } + if (argc < 6) { + printf(" syntax: %s <{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); + + 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"); + } - // 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); + // 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" PRIx64 "]\n\n", key); + crypto1_destroy(revstate); + + t1 = clock() - t1; + if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1); + return 0; }