package com.gingersoft.gsa.cloud.common.utils.encryption;


import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

/**
 * AES的加密和解密
 *
 * @author libo
 */
public class Aes {
    //密钥 (需要前端和后端保持一致)
    private static final String KEY = "gingersoft_20201";
    //算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    /**
     * aes解密
     *
     * @param encrypt 内容
     * @return
     * @throws Exception
     */
    public static String aesDecrypt(String encrypt) {
        try {
            return aesDecrypt(encrypt, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * aes加密
     *
     * @param content
     * @return
     * @throws Exception
     */
    public static String aesEncrypt(String content) {
        try {
            return aesEncrypt(content, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 将byte[]转为各种进制的字符串
     *
     * @param bytes byte[]
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
     * @return 转换后的字符串
     */
    public static String binary(byte[] bytes, int radix) {
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
    }

    /**
     * base 64 encode
     *
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes) {


//        return android.util.Base64.encodeToString(bytes, Base64.NO_WRAP);

        return new BASE64Encoder().encode(bytes);
//        return Base64Utils.encode(bytes);
        //        return new String(Base64.decode(bytes, android.util.Base64.NO_PADDING));
//        return Base64.encodeBase64String(bytes);
    }
//return Base64.encodeBase64String(bytes);

    /**
     * base 64 decode
     *
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception {
        return base64Code == null ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }


    /**
     * AES加密
     *
     * @param content    待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));

        return cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
    }


    /**
     * AES加密为base 64 code
     *
     * @param content    待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) {
        try {
            return base64Encode(aesEncryptToBytes(content, encryptKey));
        } catch (Exception e) {
            System.out.print(encryptKey);
            return null;
        }
    }

    /**
     * AES解密
     *
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey   解密密钥
     * @return 解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes);
    }


    /**
     * 将base 64 code AES解密
     *
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) {
        try {
            return encryptStr == null ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.print(encryptStr);
        }
        return null;
    }

    /**
     * 测试
     */
    public static void main(String[] args) {
        String content = "9_472_1618887480605_4e93b91320004e49ba163deab8657caa";
        System.out.println("加密前：" + content);
        System.out.println("加密密钥和解密密钥：" + KEY);
        String encrypt = aesEncrypt(content, KEY).replaceAll("\r|\n", "");;
        System.out.println("加密后：" + encrypt);
        String decrypt = aesDecrypt("encrypt", KEY);
        System.out.println("解密后：" + decrypt);

//base64编码
//String strBase64 = new String(Base64.encode(str.getBytes(), Base64.DEFAULT));
//        String strBase64 = android.util.Base64.encodeToString("", android.util.Base64.DEFAULT);
//base64解码
//        String str2 = new String(android.util.Base64.decode(strBase64.getBytes(), android.util.Base64.DEFAULT));
    }
}
