import java.io.UnsupportedEncodingException;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

public class Encrypt_Decrypt_AES {

    /**

     * AES加密算法，调用Java自有类库，采用CFB模式密文反馈无填充模式，可以保证数据长度在加密前后是相同的

     * @param content 待加密内容

     * @param key 密钥

     * @return byte[] 加密结果用byte数组表示

     *

     */

    public static byte[] encrypt_AES(String content, String key) {

        try {

            Cipher aesECB = Cipher.getInstance("AES/CFB/NoPadding");

            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");

            IvParameterSpec ivSpec = new IvParameterSpec(key.getBytes());

            aesECB.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);

            byte[] result = aesECB.doFinal(content.getBytes());

            return result;

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        } catch (NoSuchPaddingException e) {

            e.printStackTrace();

        } catch (InvalidKeyException e) {

            e.printStackTrace();

        } catch (IllegalBlockSizeException e) {

            e.printStackTrace();

        } catch (BadPaddingException e) {

            e.printStackTrace();

        } catch (InvalidAlgorithmParameterException e) {

            // TODO 自动生成的 catch 块

            e.printStackTrace();

        }

        return null;

    }

    /**

     *

     * @param content 待解密内容，字符串形式

     * @param key    解密用的密钥

     * @return    使用字符串形式返回解密内容

     * @throws UnsupportedEncodingException

     */

    public static String decrypt_AES(byte[] content, String key) throws UnsupportedEncodingException {

        try {

            Cipher aesECB = Cipher.getInstance("AES/CFB/NoPadding");

            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");

            IvParameterSpec ivSpec = new IvParameterSpec(key.getBytes());

            aesECB.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

            byte[] result = aesECB.doFinal(content);

            String AES_decode=new String(result,"utf-8");

            /************************************/

//            System.out.println("解密结果："+AES_decode);

            return AES_decode;

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        } catch (NoSuchPaddingException e) {

            e.printStackTrace();

        } catch (InvalidKeyException e) {

            e.printStackTrace();

        } catch (IllegalBlockSizeException e) {

            e.printStackTrace();

        } catch (BadPaddingException e) {

            e.printStackTrace();

        } catch (InvalidAlgorithmParameterException e) {

            // TODO 自动生成的 catch 块

            e.printStackTrace();

        }

        return null;

    }

    public static void main(String[] str) throws InvalidKeyException,

            InvalidAlgorithmParameterException, IllegalBlockSizeException,

            BadPaddingException, UnsupportedEncodingException {

        String s = "fire fox 22";

        byte[] r = encrypt_AES(s, "@93456781234567A");

        for (byte i : r){

            String l = Integer.toBinaryString((i & 0xFF) + 0x100).substring(1);

            System.out.print(l+" ");

        }

        System.out.println();

        decrypt_AES(r, "@93456781234567A");

    }

}