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/* Public key cracker.
*
* Can be used to find public keys starting with specific hex (ABCD) for example.
*
* NOTE: There's probably a way to make this faster.
*
* Usage: ./cracker ABCDEF
*
* Will try to find a public key starting with: ABCDEF
*/
#include "../../testing/misc_tools.c"
#include <time.h>
/* NaCl includes*/
#include <sodium/crypto_scalarmult_curve25519.h>
#include <sodium/randombytes.h>
/* Sodium include*/
//#include <sodium.h>
void print_key(uint8_t *client_id)
{
uint32_t j;
for (j = 0; j < 32; j++) {
printf("%02hhX", client_id[j]);
}
}
int main(int argc, char *argv[])
{
if (argc < 2) {
printf("usage: ./cracker public_key(or beginning of one in hex format)\n");
return 0;
}
long long unsigned int num_tries = 0;
uint32_t len = strlen(argv[1]) / 2;
unsigned char *key = hex_string_to_bin(argv[1]);
uint8_t pub_key[32], priv_key[32], c_key[32];
if (len > 32) {
len = 32;
}
memcpy(c_key, key, len);
free(key);
randombytes(priv_key, 32);
while (1) {
crypto_scalarmult_curve25519_base(pub_key, priv_key);
uint32_t i;
if (memcmp(c_key, pub_key, len) == 0) {
break;
}
for (i = 32; i != 0; --i) {
priv_key[i - 1] += 1;
if (priv_key[i - 1] != 0) {
break;
}
}
++num_tries;
}
printf("Public key:\n");
print_key(pub_key);
printf("\nPrivate key:\n");
print_key(priv_key);
printf("\n %llu keys tried\n", num_tries);
return 0;
}
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