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import java.util.Base64;
import java.util.Scanner;
import java.util.concurrent.atomic.AtomicInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.nio.charset.StandardCharsets;
public class HashBreaker
{
public static void main(String[] args) throws NoSuchAlgorithmException {
var scanner = new Scanner(System.in);
System.out.println("Nonce Finder");
System.out.print("Message : ");
String message = scanner.nextLine();
System.out.print("Difficulty : ");
int d = scanner.nextInt();
System.out.println("\nCalculating...");
long startTime = System.currentTimeMillis();
long nonce = bruteforce(d, message);
long endTime = System.currentTimeMillis();
System.out.println("\nValid Nonce : " + nonce);
System.out.println("Hash : " + sha256(message + String.valueOf(nonce)));
System.out.println("Time taken : " + (endTime - startTime)/1000f + " seconds");
scanner.close();
}
public static String sha256(String text) throws NoSuchAlgorithmException {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.update(text.getBytes(StandardCharsets.UTF_8));
byte[] hash = digest.digest();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < hash.length; i++)
sb.append(Integer.toString((hash[i] & 0xff) + 0x100, 16).substring(1));
return sb.toString().toUpperCase();
}
public static long bruteforce(int d, String s) throws NoSuchAlgorithmException {
long nonce = 0;
String pre = "";
for (; pre.length()<d; pre += "0");
while (!sha256(s + String.valueOf(nonce)).startsWith(pre)){
nonce++;
}
return nonce;
}
}
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