JCA-Salt example

JCA的message digest介紹:
1.使用SHA-256
2.加入salt

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import org.apache.commons.codec.binary.Base64;



/**

 * 

 * @author andy

 */

public class MessageDigestExample {



    public static void main(String args[]) {

        // put code here to create a MD5 hash with a salt

     MessageDigest md=null;

     byte password[]={'p','a','s','s','w','o','r','d'};

     

     try {

    md= MessageDigest.getInstance("SHA-256");

   

  } catch (NoSuchAlgorithmException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

  md.update(password);

  byte[] salt=new byte[8];

  SecureRandom random=null;

  try {

    random= SecureRandom.getInstance("SHA1PRNG");

  } catch (NoSuchAlgorithmException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

  random.nextBytes(salt);

  md.update(salt);

  byte[] hash=md.digest();

  String encodingString=new String(Base64.encodeBase64(hash));

  System.out.println("salt please:"+encodingString);

    }

 

}