DES加密

最新推荐文章于 2024-05-29 17:47:58 发布

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本文介绍了一种使用Java实现的简单DES加密解密方法。通过具体代码示例展示了如何利用DES算法进行数据加密和解密的过程。该方法首先定义了加密算法及模式，接着创建密钥并使用Cipher类完成加密或解密操作。

简单的DES加密解密方法

import java.security.Key;

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

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

public class DESCodecTest
{
public static final String ALGORITHM_DES = "DES/ECB/PKCS5Padding";

    public static String encode(String key,String data) throws Exception
    {
        return encode(key, data.getBytes());
    }

    public static String encode(String key,byte[] data) throws Exception
    {
        try
        {
            DESKeySpec dks = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            //key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            byte[] bytes = cipher.doFinal(data);
            return bytes == null ? null : new String(Base64.encodeBase64(bytes));
           // return bytes;
        } catch (Exception e){
            throw new Exception(e);
        }
    }


    public static String decode(String key,String data) throws Exception
    {
        return decode(key, data.getBytes());
    }

    public static String decode(String key,byte[] data) throws Exception
    {
        try
        {
            DESKeySpec dks = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            //key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            byte [] bytes = cipher.doFinal(Base64.decodeBase64(data));
            return bytes == null ? null : new String(bytes);
            //return bytes;
        } catch (Exception e)
        {
            throw new Exception(e);
        }
    }

    public static void main(String [] args) throws Exception{
    String en = DESCodecTest.encode("20160113SS000020", "PASSWORD");
    System.out.println(en);
    String result = DESCodecTest.decode("20160113SS000020", en);
    System.out.println(result);
    }
}