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 = "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);

        }

}