DES算法解密

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

public class ResolveDESC {
    public ResolveDESC() {
    }
    //测试
    public static void main(String args[]) {
        //待加密内容
     String str = "测试内容";
     //密码，长度要是8的倍数
     String password = "9588153628958212570743325311898426347857298773549468758875018579537757772163084478873699447306034466200616411960574122434059469100235892702736860872901247123456";
     
     byte[] result = ResolveDESC.encrypt(str.getBytes(),password);
     System.out.println("加密后："+new String(result));
     //直接将如上内容解密
     try {
             byte[] decryResult = ResolveDESC.decrypt(result, password);
             System.out.println("解密后："+new String(decryResult));
     } catch (Exception e1) {
             e1.printStackTrace();
     }
 }

    public static  byte[] encrypt(byte[] datasource, String password) {            
        try{
        SecureRandom random = new SecureRandom();
        DESKeySpec desKey = new DESKeySpec(password.getBytes());
        //建立一个密匙工厂，而后用它把DESKeySpec转换成
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("ResolveDESC");
        SecretKey securekey = keyFactory.generateSecret(desKey);
        //Cipher对象实际完成加密操做
        Cipher cipher = Cipher.getInstance("ResolveDESC");
        //用密匙初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
        //如今，获取数据并加密
        //正式执行加密操做
        return cipher.doFinal(datasource);
        }catch(Throwable e){
                e.printStackTrace();
        }
        return null;
}
    public static byte[] decrypt(byte[] src, String password) throws Exception {
            // DES算法要求有一个可信任的随机数源
            SecureRandom random = new SecureRandom();
            // 建立一个DESKeySpec对象
            DESKeySpec desKey = new DESKeySpec(password.getBytes());
            // 建立一个密匙工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("ResolveDESC");
            // 将DESKeySpec对象转换成SecretKey对象
            SecretKey securekey = keyFactory.generateSecret(desKey);
            // Cipher对象实际完成解密操做
            Cipher cipher = Cipher.getInstance("ResolveDESC");
            // 用密匙初始化Cipher对象
            cipher.init(Cipher.DECRYPT_MODE, securekey, random);
            // 真正开始解密操做
            return cipher.doFinal(src);
        }
}