DES加密解密

package my;

import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class Test {
    private static final byte[] DES_KEY={21,1,-110,82,-32,-85,-128,-65};//64位密钥

    public static void main(String[] args) {
        String str = "0123456789abcdefg";
        System.out.println("原始数据：" + str);
        //DES数据加密
        String s1 = encryptBasedDes(str);
        System.out.println("加密数据：" + s1);
        // DES数据解密   
        String s2 = decryptBasedDes(s1);
        System.err.println("解密数据：" + s2);
    }

    /** 
     * 数据加密，算法（DES） 
     * @param data  要进行加密的数据 
     * @return 加密后的数据 
     */
    public static String encryptBasedDes(String data) {
        String encryptedData = null;
        try {
            // DES算法要求有一个可信任的随机数源   
            SecureRandom sr = new SecureRandom();
            DESKeySpec deskey = new DESKeySpec(DES_KEY);
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象   
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(deskey);
            // 加密对象   
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key, sr);
            // 加密，并把字节数组编码成字符串   
            encryptedData = new sun.misc.BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            //log.error("加密错误，错误信息：", e);   
            throw new RuntimeException("加密错误，错误信息：", e);
        }
        return encryptedData;
    }

    /** 
     * 数据解密，算法（DES） 
     * @param cryptData  加密数据 
     * @return 解密后的数据 
     */
    public static String decryptBasedDes(String cryptData) {
        String decryptedData = null;
        try {
            // DES算法要求有一个可信任的随机数源   
            SecureRandom sr = new SecureRandom();
            DESKeySpec deskey = new DESKeySpec(DES_KEY);
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象   
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(deskey);
            // 解密对象   
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key, sr);
            // 把字符串解码为字节数组，并解密   
            decryptedData = new String(cipher.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(cryptData)));
        } catch (Exception e) {
            //log.error("解密错误，错误信息：", e);   
            throw new RuntimeException("解密错误，错误信息：", e);
        }
        return decryptedData;
    }
}