package com.iktapp.api.utils;

import org.apache.commons.codec.DecoderException;

import org.apache.commons.codec.binary.Hex;

import org.apache.commons.lang3.StringUtils;

import javax.crypto.*;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import java.io.UnsupportedEncodingException;

import java.nio.charset.StandardCharsets;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.util.Base64;

public class AESHexUtil {

    /**

     * 加密算法

     */

    private static String Algorithm = "AES";

    /**

     * 算法/模式/补码方式

     */

    private static String AlgorithmProvider = "AES/ECB/PKCS5Padding";

    /**

     * 加密

     *

     * @param src       原内容

     * @param uniqueKey 唯一key

     * @return

     * @throws NoSuchPaddingException

     * @throws NoSuchAlgorithmException

     * @throws InvalidKeyException

     * @throws BadPaddingException

     * @throws IllegalBlockSizeException

     * @throws DecoderException

     */

    public static String encrypt(String src, String uniqueKey) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, DecoderException {

        byte[] key = uniqueKey.getBytes();

        SecretKey secretKey = new SecretKeySpec(key, Algorithm);

        Cipher cipher = Cipher.getInstance(AlgorithmProvider);

        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        byte[] cipherBytes = cipher.doFinal(src.getBytes(StandardCharsets.UTF_8));

        return byteToHexString(cipherBytes);

    }

    /**

     * 解密

     *

     * @param enc       加密内容

     * @param uniqueKey 唯一key

     * @return

     * @throws NoSuchPaddingException

     * @throws NoSuchAlgorithmException

     * @throws UnsupportedEncodingException

     * @throws InvalidAlgorithmParameterException

     * @throws InvalidKeyException

     * @throws DecoderException

     * @throws BadPaddingException

     * @throws IllegalBlockSizeException

     */

    public static String decrypt(String enc, String uniqueKey) throws NoSuchPaddingException, NoSuchAlgorithmException, UnsupportedEncodingException, InvalidAlgorithmParameterException, InvalidKeyException, DecoderException, BadPaddingException, IllegalBlockSizeException {

        byte[] key = uniqueKey.getBytes();

        SecretKey secretKey = new SecretKeySpec(key, Algorithm);

        Cipher cipher = Cipher.getInstance(AlgorithmProvider);

        cipher.init(Cipher.DECRYPT_MODE, secretKey);

        byte[] hexBytes = hexStringToBytes(enc);

        byte[] plainBytes = cipher.doFinal(hexBytes);

        return new String(plainBytes, "utf-8");

    }

    /**

     * 将byte数组转换为16进制字符串

     *

     * @param src

     * @return

     */

    private static String byteToHexString(byte[] src) {

        return Hex.encodeHexString(src);

    }

    /**

     * 将16进制字符串转换为byte数组

     *

     * @param hexString

     * @return

     */

    private static byte[] hexStringToBytes(String hexString) throws DecoderException {

        return Hex.decodeHex(hexString.toCharArray());

    }

    /**

     * AES加密、解密测试方法

     *

     * @param args

     */

    public static void main(String[] args) {

        try {

            // 唯一key作为密钥

            String uniqueKey = "jfdjk670qEH5lm3b";

            // 加密前数据，此处数据与前端数据一致(加密内容包含有时间戳)，请注意查看前端加密前数据

            String src = "{\"name\":\"何丽\",\"mobile\":\"15757099671\",\"idCard\":\"42230119780801112X\"}";

            System.out.println("密钥:" + uniqueKey);

            System.out.println("原字符串:" + src);

            // 加密

            String encrypt = encrypt(src, uniqueKey);

            System.out.println("加密：" + encrypt);

            // 解密

            String aa ="ab98b6ef43d7c492389b7eebc7ee7e6d31f8d8d94474ee5c86591d6bf656b6399e0e104c6c1691764951b52c6d55dc8ea589d68b92e80f3d941daf2d135be649a0a664d2b8cdd6e8114d030206d572fc";

            String decrypt = decrypt(aa, uniqueKey);

            System.out.println("解密：" + decrypt);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}