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This commit is contained in:
iceman1001 2024-09-06 10:13:19 +02:00
parent 996429fa9e
commit abb8a72bb6
1 changed files with 17 additions and 5 deletions
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22
tools/mfc/card_only/staticnested_2x1nt_rf08s_1key.c
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@ -45,13 +45,16 @@ static uint16_t compute_seednt16_nt32(uint32_t nt32, uint64_t key) {
uint8_t b[] = {0, 13, 1, 14, 4, 10, 15, 7, 5, 3, 8, 6, 9, 2, 12, 11};
uint16_t nt = nt32 >> 16;
uint8_t prev = 14;
for (uint8_t i = 0; i < prev; i++) {
nt = prev_lfsr16(nt);
}
uint8_t prevoff = 8;
bool odd = 1;
for (uint8_t i = 0; i < 6 * 8; i += 8) {
if (odd) {
nt ^= (a[(key >> i) & 0xF]);
nt ^= (b[(key >> i >> 4) & 0xF]) << 4;
@ -59,8 +62,10 @@ static uint16_t compute_seednt16_nt32(uint32_t nt32, uint64_t key) {
nt ^= (b[(key >> i) & 0xF]);
nt ^= (a[(key >> i >> 4) & 0xF]) << 4;
}
odd ^= 1;
prev += prevoff;
for (uint8_t j = 0; j < prevoff; j++) {
nt = prev_lfsr16(nt);
}
@ -69,12 +74,14 @@ static uint16_t compute_seednt16_nt32(uint32_t nt32, uint64_t key) {
}
int main(int argc, char *const argv[]) {
if (argc != 4) {
printf("Usage:\n %s <nt1:08x> <key1:012x> keys_<uid:08x>_<sector:02>_<nt2:08x>.dic\n"
" where dict file is produced by rf08s_nested_known *for the same UID and same sector* as provided nt and key\n",
argv[0]);
return 1;
}
uint32_t nt1 = hex_to_uint32(argv[1]);
uint64_t key1 = 0;
if (sscanf(argv[2], "%012" PRIx64, &key1) != 1) {
@ -85,12 +92,12 @@ int main(int argc, char *const argv[]) {
char *filename = argv[3];
uint32_t uid, sector, nt2;
int result;
result = sscanf(filename, "keys_%8x_%2d_%8x.dic", &uid, &sector, &nt2);
int result = sscanf(filename, "keys_%8x_%2d_%8x.dic", &uid, &sector, &nt2);
if (result != 3) {
fprintf(stderr, "Error: Failed to parse the filename %s.\n", filename);
return 1;
}
if (nt1 == nt2) {
fprintf(stderr, "Error: File must belong to different nonce.\n");
return 1;
@ -103,6 +110,7 @@ int main(int argc, char *const argv[]) {
FILE *fptr = fopen(filename, "r");
if (fptr != NULL) {
uint64_t buffer;
while (fscanf(fptr, "%012" PRIx64, &buffer) == 1) {
keycount2++;
@ -114,6 +122,7 @@ int main(int argc, char *const argv[]) {
fclose(fptr);
goto end;
}
rewind(fptr);
for (uint32_t i = 0; i < keycount2; i++) {
@ -124,12 +133,13 @@ int main(int argc, char *const argv[]) {
}
}
fclose(fptr);
} else {
fprintf(stderr, "Warning: Cannot open %s\n", filename);
goto end;
}
printf("%s: %i keys loaded\n", filename, keycount2);
printf("%s: %u keys loaded\n", filename, keycount2);
uint32_t found = 0;
uint16_t seednt1 = compute_seednt16_nt32(nt1, key1);
@ -139,13 +149,15 @@ int main(int argc, char *const argv[]) {
found++;
}
}
if (!found) {
if (found == 0) {
printf("No key found :(\n");
}
end:
if (keys2 != NULL)
if (keys2 != NULL) {
free(keys2);
}
return 0;
}