java 加密算法 DES 实现代码

java 加密算法 DES 实现代码

package  com.yill;

import  java.security.SecureRandom;

import  javax.crypto.Cipher;
import  javax.crypto.SecretKey;
import  javax.crypto.SecretKeyFactory;
import  javax.crypto.spec.DESKeySpec;

public   class  YillDES
{
    private static final byte[] key = "HelloWorld".getBytes();

    public static void main(String[] args)
    {
        String myInfo = "http://www.blogjava.net/yill/";

        System.out.println("MyInfo is " + myInfo);

        byte[] encrypted = encrypt(myInfo.getBytes());

        System.out.println("Encrypted myInfo is " + new String(encrypted));

        System.out.println("Decrypted myInfo is "
                + new String(decrypt(encrypted)));
    }

    public static byte[] encrypt(byte[] origin)
    {
        byte[] encrypted = null;
        try
        {
            // 生成密钥
            SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = factory.generateSecret(new DESKeySpec(key));

            // 初始化加密工具cipher
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, new SecureRandom());
            encrypted = cipher.doFinal(origin);
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return encrypted;
    }

    public static byte[] decrypt(byte[] encrypted)
    {
        byte[] decrypted = null;
        try
        {
            // 生成密钥
            SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = factory.generateSecret(new DESKeySpec(key));

            // 初始化加密工具cipher
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, secretKey, new SecureRandom());
            decrypted = cipher.doFinal(encrypted);
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return decrypted;
    }
}

运行结果：

MyInfo is http://www.blogjava.net/yill/ Encrypted myInfo is X耾% 孑塖籫ㄎn勯錍雴?:啌狒>堷z Decrypted myInfo is http://www.blogjava.net/yill/