Sha 256 and Sha 512 with UUID salt using Groovy

sha256_512_example.groovy

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

private String convertToHex(final byte[] messageDigest) {       
    BigInteger bigint = new BigInteger(1, messageDigest);       
    String hexText = bigint.toString(16);       
    while (hexText.length() < 32) {          
        hexText = "0".concat(hexText);       
    }       
    return hexText;    
}

String salt = UUID.randomUUID()
String pass = "hola mundo"

MessageDigest md256 = MessageDigest.getInstance("SHA-256");
MessageDigest md512 = MessageDigest.getInstance("SHA-512");

def saltDigest = md256.digest(salt.getBytes(StandardCharsets.UTF_8));
def shaDigest = md256.digest(pass.getBytes(StandardCharsets.UTF_8));
def finalDigest = md512.digest("${convertToHex(saltDigest)}.${convertToHex(shaDigest)}".getBytes(StandardCharsets.UTF_8))

println "Sha salt >>> ${convertToHex(saltDigest)}"
println "Sha pass >>> ${convertToHex(shaDigest)}"
println "Sha final >>> ${convertToHex(finalDigest)}"