Java密码学消息摘要

import java.security.MessageDigest;

import java.util.Scanner;



public class MessageDigestExample {

   public static void main(String args[]) throws Exception{



      //Reading data from user

      Scanner sc = new Scanner(System.in);

      System.out.println("Enter the message");

      String message = sc.nextLine();



      //Creating the MessageDigest object  

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



      //Passing data to the created MessageDigest Object

      md.update(message.getBytes());



      //Compute the message digest

      byte[] digest = md.digest();      



      System.out.println(digest);  



      //Converting the byte array in to HexString format

      StringBuffer hexString = new StringBuffer();

      for (int i = 0;i<digest.length;i++) {

         hexString.append(Integer.toHexString(0xFF & digest[i]));

      }

      System.out.println("Hex format : " + hexString.toString());     

   }

}