PBKDF2Encoder

package pbkdf2encoder;

import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.util.Scanner;

//importy dla pbkdf2
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.SecretKeyFactory;
import java.util.Base64;

public class PBKDF2Encoder
{
    public static void main(String[] args) throws GeneralSecurityException
    {
        Encode();
    }

    public static String toHex(byte[] hash)
    {
        BigInteger bi = new BigInteger(1, hash);
        String hex = bi.toString(16);
        return hex;
    }

    public static byte[] PBKDF2(String paswd, byte[] salt, int pLength, int i)
            throws GeneralSecurityException
    {
        PBEKeySpec keySpec = new PBEKeySpec(paswd.toCharArray(), salt, i, pLength * 4);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        byte[] hash = keyFactory.generateSecret(keySpec).getEncoded();

        return hash;
    }

    public static void Encode() throws GeneralSecurityException
    {
        String paswd, acc ,id;
        int pLength, ver;
        Scanner scanner = new Scanner(System.in);

        System.out.print("Hasło: ");
        paswd = scanner.nextLine();
        System.out.print("Konto: ");
        acc = scanner.nextLine();
        System.out.print("Identyfikator: ");
        id = scanner.nextLine();
        System.out.print("Długość: ");
        pLength = scanner.nextInt();
        System.out.print("Numer wersji: ");
        ver = scanner.nextInt();

//        SecureRandom rnd = new SecureRandom();
//        byte[] salt = new byte[24];
//        rnd.nextBytes(salt);

        byte[] salt = (acc+id+ver).getBytes();

        byte[] hash = PBKDF2(paswd, salt, pLength, 1000);
        String hex = toHex(hash);

        String b64 = Base64.getEncoder().withoutPadding().encodeToString(hex.getBytes());
        char[] encd = new char[pLength];
        char[] b64c = b64.toCharArray();

        for(int i=0; i<pLength;i++)
            encd[i] = (char)(((int)b64c[i])+3);
        System.out.print("Zakodowane hasło: ");
        for(char e : encd)
            System.out.print(e);
        System.out.println();
    }
}