#define __STDC_FORMAT_MACROS #include #define llx PRIx64 #define lli PRIi64 // Test-file: test2.c #include "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 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}> [enc] [enc...]\n\n", argv[0]); return 1; } int encc = argc - 6; int enclen[encc]; uint8_t enc[encc][120]; 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", (uint8_t*)&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)); // 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); // 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); return 0; }