GeraSenhaHash

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package gerasenhahash;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
import java.util.Scanner;
/**
 *
 * @author RenanTeles
 */
public class GeraSenhaHash {

    String nomeUser,PassUser;
    /**
     * @param args the command line arguments
     * @throws java.security.NoSuchAlgorithmException
     * @throws java.io.UnsupportedEncodingException
     */
    public static void main(String[] args)  throws NoSuchAlgorithmException, UnsupportedEncodingException, IOException{
        // TODO code application logic here
      Scanner sc = new Scanner(System.in);
        System.out.println("Digite o usuário:");
        String newUser = sc.nextLine();

        System.out.println("Digite a senha:");
        String newPassword = sc.nextLine();

        String hashSenha = transformaHash(newPassword);

        leJson();



    }


    private static String transformaHash(String senha) throws NoSuchAlgorithmException{

       MessageDigest md = MessageDigest.getInstance("MD5");
       md.update(senha.getBytes());
       byte[] hashMd5 = md.digest();
       String hashString = paraStringHexa(hashMd5);
       //System.out.println(hashString);
       String HashFinal = hashString.substring(0, 5);
       //System.out.println(HashFinal);

       return HashFinal;

    }

    private static String paraStringHexa(byte[] bytes) {
        StringBuilder s = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            int parteAlta = ((bytes[i] >> 4) & 0xf) << 4;
            int parteBaixa = bytes[i] & 0xf;
            if (parteAlta == 0) s.append('0');
            s.append(Integer.toHexString(parteAlta | parteBaixa));
        }
        return s.toString();
    }

    private static void leJson() throws IOException{

     try(Reader reader = new InputStreamReader(GeraSenhaHash.class.getResourceAsStream("/cadastroUsuario.json"))){
            Gson gson = new GsonBuilder().create();
            Usuario p = gson.fromJson(reader, Usuario.class);
            System.out.println(p);
        }
    }
}