messagedigestexample.java

这是一个文本加密、解密系统

package example;

import java.security.MessageDigest;
/**
*单一的消息摘要算法，不使用密码.可以用来对明文消息（如：密码）隐藏保存
*/
public class MessageDigestExample
{
    public static void main(String args[]) throws Exception
    {
        byte[] plainText = args[0].getBytes("UTF8");
        
        MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
        System.out.println("\n"+messageDigest.getProvider().getInfo());
        messageDigest.update(plainText);
        System.out.println("\nDigest:");
        System.out.println(new String(messageDigest.digest(),"UTF8"));
        
        System.out.println(new String(plainText, "UTF8"));
    }
}