MD5 Generator

package com.livrona.snippets.security;

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

/**
 * This snippet shows how we can generate the digest MD5 
 * for a given string. The digest is a one way hash and 
 * is represented into hex.
 * 
 * @author mvohra
 */
publicclass MD5Generator {
publicstaticvoid main(String args[]) throws Exception {
// string to be encoded
		String text ="Hello World";

// get the instances for a given digest scheme MD5 or SHA
		MessageDigest m = MessageDigest.getInstance("MD5");

// generate the digest ; pass in the text as bytes,
// length to the bytes(offset) to be hashed; for full string 
// pass 0 to text.length()
		m.update(text.getBytes(), 0, text.length());

// get the String representation of hash bytes, 
// create a big integer out of bytes
// then convert it into hex value (16 as input to toString method)
		String digest =new BigInteger(1, m.digest()).toString(16); 
		System.out.println("MD5: "+ digest);
	}
}