package ***;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class AesEBC {

    /*已确认
    * 加密用的Key 可以用26个字母和数字组成
    * 此处使用AES-128-CBC加密模式，key需要为16位。
    */
        private static String sKey="1234567890123456";
        private static String ivParameter="1234567890123456";
        private static AesEBC instance=null;
        //private static 
        private AesEBC(){

        }
        public static AesEBC getInstance(){
            if (instance==null)
                instance= new AesEBC();
            return instance;
        }
        // 加密
        public String encrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            byte[] raw = sKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
            return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
    }

        // 解密
        public String decrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
            try {
                byte[] raw = sKey.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
                cipher.init(Cipher.DECRYPT_MODE, skeySpec);
                byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,encodingFormat);
                return originalString;
            } catch (Exception ex) {
                return null;
            }
    }

        public static void main(String[] args) throws Exception {
            // 需要加密的字串
            String cSrc = "http://www.mamicode.com/123456";
            System.out.println("加密前的字串是："+cSrc);
            // 加密
            String enString = AesEBC.getInstance().encrypt(cSrc,"utf-8",sKey,ivParameter);
            System.out.println("加密后的字串是："+ enString);
            System.out.println("yXVUkR45PFz0UfpbDB8/ew==".equals(enString));
            // 解密
            String DeString = AesEBC.getInstance().decrypt(enString,"utf-8",sKey,ivParameter);
            System.out.println("解密后的字串是：" + DeString);
        }

}