Generate MD5 Hash value for any input given using Java

The MD5 Message-Digest Algorithm is a widely used cryptographic hash function that produces a 128-bit (16-byte) hash value. MD5 has been employed in a wide variety of security applications, and is also commonly used to check data integrity

A cryptographic hash function is a hash function, that is, an algorithm that takes an arbitrary block of data and returns a fixed-size bit string, the hash value, such that an change to the data will change the hash value. The data to be encoded is often called the message, and the hash value is sometimes called the message digest or simply digest.

java.security.MessageDigest provides applications the functionality of a message digest algorithm, such as MD5 or SHA.

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
 
public class JavaMD5Hash {
 
    public static void main(String[] args) {
 
            String password = "MyPassword123";
 
            System.out.println("MD5 in hex: " + md5(password));
 
             
            System.out.println("MD5 in hex: " + md5(null));
            //= d41d8cd98f00b204e9800998ecf8427e
             
             
            System.out.println("MD5 in hex: "
                + md5("The quick brown fox jumps over the lazy dog"));
            //= 9e107d9d372bb6826bd81d3542a419d6
    }
     
     
    public static String md5(String input) {
         
        String md5 = null;
         
        if(null == input) return null;
         
        try {
             
        //Create MessageDigest object for MD5
        MessageDigest digest = MessageDigest.getInstance("MD5");
         
        //Update input string in message digest
        digest.update(input.getBytes(), 0, input.length());
 
        //Converts message digest value in base 16 (hex)
        md5 = new BigInteger(1, digest.digest()).toString(16);
 
        } catch (NoSuchAlgorithmException e) {
 
            e.printStackTrace();
        }
        return md5;
    }
}