Question

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Generate MD5 hash in Java

Can some one tell me how to convert a string into MD5 format in Java?

I have code like this, but I want in MD5 format with 32 characters.

UUID uuid = UUID.randomUUID();
String token = uuid.toString().substring(0,12);

Answer 1

Implemenation

import java.security.MessageDigest;
import java.math.BigInteger;
import java.lang.String

public class SecurityUtil {

  public static String stringToMD5(String string) throws NoSuchAlgorithmException {

    MessageDigest messageDigest = MessageDigest.getInstance("MD5");
    messageDigest.update(string.getBytes(Charset.forName("UTF-8")),0,string.length());
    return new BigInteger(1,messageDigest.digest()).toString(16);
  }
}

Usage:

  System.out.println(String.format("MD5: %s", stringToMD5("P@$$\\/\\/R|)")));

Output:

MD5: 91162629d258a876ee994e9233b2ad87*

In this sample was used the coding UTF-8.

What is Charset ?
What is MessageDigest ?
What is UTF-8 >

*md5 is example from Wikipedia.