import java.util.Random;

/**
 * Created by tao.
 * Date: 2021/6/28 16:43
 * 描述:
 */
public class CDKeyUtil {

    //機(jī)器版本號(hào)

    /**
     * 激活碼生成方法
     *
     * @param category 密鑰類別（固定兩位數(shù)字）
     * @param deadline 使用期限（固定一位字符）
     * @return 返回的激活碼
     */
    public static String createCDkey(String category, String deadline, String machineVersion) throws Exception {
        String CDKey = "";
        //1. 獲取前四位
        String sequence = getSequence();
        //2. 生成前七位
        String plaintext = sequence + category + deadline;
        //3.對(duì)明文進(jìn)行加密
        CDKey = CDKeyEncryptUtils.AESencrypt(plaintext).substring(0, 11);
        //4.獲取后四位
        String rulesSequence = CDKeyUtil.getRulesSequence(machineVersion);
        //5.混淆操作
        CDKey = CDKey + rulesSequence;
        CDKey = confusion(CDKey);
        //6.得到激活碼
        return CDKey;
    }


    /**
     * 激活碼解碼方法
     *
     * @param CDKey 激活碼
     * @return 返回激活碼明文
     */
    public static String deCDkey(String CDKey, String machineVersion) throws Exception {
        //1. 解除混淆
        String deConfusion = deConfusion(CDKey);
        //2. 提取后四位序列(第1位版本號(hào)，后三位校驗(yàn)其規(guī)則)
        String sequence = deConfusion.substring(deConfusion.length() - 4);
        //3. 獲取后三位序列并且轉(zhuǎn)為10進(jìn)制，和版本號(hào)
        String randomInt = sequence.substring(1);
        String version = sequence.substring(0, 1);
        int to10 = Integer.parseInt(change32To10(randomInt));
        //4. 根據(jù)既定規(guī)則校驗(yàn)激活碼是否正確
        if (to10 % 11 == 0 && version.equals(machineVersion)) {
            //1. 如果后四位序列校驗(yàn)正確,則對(duì)激活碼進(jìn)行解密操作
            String secretKey = deConfusion.substring(0, 11);
            String code = "";
            try {
                code = CDKeyEncryptUtils.AESdecrypt(secretKey);
            } catch (Exception e) {
                e.printStackTrace();
                return "激活碼錯(cuò)誤";
            }
            return code;
        } else {
            return "激活碼錯(cuò)誤";
        }

    }


    /**
     * 獲得激活碼前四位序列方法
     *
     * @return 返回激活碼前四位序列
     */
    public static String getSequence() {
        String sequence = "";
        //1. 獲取隨機(jī)數(shù)
        int randomInt = getRandomInt();
        //2. 轉(zhuǎn)32進(jìn)制
        String to32 = change10To32(randomInt + "");
        //3. 補(bǔ)全四位
        int len = to32.length();
        if (len < 4) {
            for (int i = 0; i < 4 - len; i++) {
                to32 = "0" + to32;
            }
        }
        sequence = to32;
        return sequence;
    }

    /**
     * 獲得激活碼后四位規(guī)則序列方法
     *
     * @param machineVersion 機(jī)器版本號(hào)
     * @return 返回激活碼后四位規(guī)則序列
     */
    public static String getRulesSequence(String machineVersion) {
        String rulesSequence;
        //1. 按照規(guī)則獲取前三位
        /*int randomInt = new Random().nextInt(8);
        String randomStr = randomInt + "" + (randomInt + 1) + (randomInt + 2);*/

        //1. 按照規(guī)則獲取前三位
        int randomInt = new Random().nextInt(2500);
        String randomStr = (randomInt * 11) + "";
        //2. 轉(zhuǎn)32進(jìn)制
        String to32 = change10To32(randomStr);
        //3. 補(bǔ)全三位
        int len = to32.length();
        if (len < 3) {
            for (int i = 0; i < 3 - len; i++) {
                to32 = "0" + to32;
            }
        }
        //4.拼接第四位
        rulesSequence = machineVersion + to32;
        return rulesSequence;
    }

    /**
     * 激活碼混淆方法
     * 奇數(shù)位+偶數(shù)位
     *
     * @return 返回激活碼混淆后的序列
     */
    public static String confusion(String CDKey) {
        String deCDKey = "";
        //1.獲取奇數(shù)位字串
        String odd = "";
        for (int i = 0; i < CDKey.length(); i = i + 2) {
            odd = odd + CDKey.charAt(i);
        }
        //2.獲取偶數(shù)位字串
        String even = "";
        for (int i = 1; i < CDKey.length(); i = i + 2) {
            even = even + CDKey.charAt(i);
        }
        //3.拼接
        deCDKey = odd + even;
        return deCDKey;
    }

    /**
     * 激活碼解除混淆方法
     *
     * @return 返回激活碼解除混淆后的序列
     */
    public static String deConfusion(String deCDKey) {
        String CDKey = "";
        //1. 拆分
        int oddCount = (deCDKey.length() / 2) + (deCDKey.length() % 2);
        String odd = deCDKey.substring(0, oddCount);
        String even = deCDKey.substring(oddCount);
        //2. 復(fù)原激活碼
        if (odd.length() == even.length()) {
            for (int i = 0; i < odd.length(); i++) {
                CDKey = CDKey + odd.charAt(i) + even.charAt(i);
            }
        } else {
            for (int i = 0; i < even.length(); i++) {
                CDKey = CDKey + odd.charAt(i) + even.charAt(i);
            }
            CDKey = CDKey + odd.charAt(odd.length() - 1);
        }
        return CDKey;
    }

    /**
     * 10進(jìn)制轉(zhuǎn)32進(jìn)制的方法
     * num 要轉(zhuǎn)換的數(shù) from源數(shù)的進(jìn)制 to要轉(zhuǎn)換成的進(jìn)制
     *
     * @param num 10進(jìn)制(字符串)
     * @return 轉(zhuǎn)換結(jié)果的32進(jìn)制字符串
     */
    public static String change10To32(String num) {
        int from = 10;
        int to = 32;
        return new java.math.BigInteger(num, from).toString(to);
    }

    /**
     * 32進(jìn)制轉(zhuǎn)10進(jìn)制的方法
     * num 要轉(zhuǎn)換的數(shù) from源數(shù)的進(jìn)制 to要轉(zhuǎn)換成的進(jìn)制
     *
     * @param num 10進(jìn)制(字符串)
     * @return 轉(zhuǎn)換結(jié)果的10進(jìn)制字符串
     */
    public static String change32To10(String num) {
        int f = 32;
        int t = 10;
        return new java.math.BigInteger(num, f).toString(t);
    }

    /**
     * 生成[min, max]之間的隨機(jī)整數(shù)
     * min 最小整數(shù)(固定0)
     * max 最大整數(shù)(固定1000000)
     *
     * @return 返回min———max之間的隨機(jī)數(shù)
     * @author tao
     */
    public static int getRandomInt() {
        int min = 0;
        int max = 1000000;
        return new Random().nextInt(max) % (max - min + 1) + min;
    }


    /*
     * 枚舉日期，返回天數(shù)
     */
    public static int duetimeEnum(String code) {
        switch (code) {
            case "0":
                return 36500;
            case "1":
                return 7;
            case "2":
                return 30;
            case "3":
                return 90;
            case "4":
                return 180;
            case "5":
                return 365;
            default:
                return 30;
        }
    }
}

import org.apache.commons.codec.binary.Base64;

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

/**
 * Created by tao.
 * Date: 2021/6/28 16:37
 * 描述:
 */
public class CDKeyEncryptUtils {
	    //--------------AES---------------
	    private static final String KEY = "12055296";  // 密匙，必須16位
	    private static final String OFFSET = "12055296"; // 偏移量
	    private static final String ENCODING = "UTF-8"; // 編碼
	    private static final String ALGORITHM = "DES"; //算法
	    private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding"; // 默認(rèn)的加密算法，CBC模式


	    public static String AESencrypt(String data) throws Exception {
	        //指定算法、獲取Cipher對(duì)象(DES/CBC/PKCS5Padding：算法為，工作模式，填充模式)
	        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
	        //根據(jù)自定義的加密密匙和算法模式初始化密鑰規(guī)范
	        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes("ASCII"), ALGORITHM);
	        //CBC模式偏移量IV
	        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
	        //初始化加密模式
	        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
	        //單部分加密結(jié)束，重置Cipher
	        byte[] encrypted = cipher.doFinal(data.getBytes(ENCODING));
	        //加密后再使用BASE64做轉(zhuǎn)碼
	        return new Base64().encodeToString(encrypted);
	    }

	    /**
	     * AES解密
	     *
	     * @param data
	     * @return String
	     * @author tao
	     * @date 2021-6-15 16:46:07
	     */
	    public static String AESdecrypt(String data) throws Exception {
	        //指定算法、獲取Cipher對(duì)象(DES/CBC/PKCS5Padding：算法為，工作模式，填充模式)
	        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
	        //根據(jù)自定義的加密密匙和算法模式初始化密鑰規(guī)范
	        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes("ASCII"), ALGORITHM);
	        //CBC模式偏移量IV
	        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
	        //初始化解密模式
	        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
	        //先用base64解碼
	        byte[] buffer = new Base64().decode(data);
	        //單部分加密結(jié)束，重置Cipher
	        byte[] encrypted = cipher.doFinal(buffer);
	        return new String(encrypted, ENCODING);
	    }
}

 public static void main(String[] args) throws Exception {
        for (int i = 0; i < 10; i++) {
            String CDKey = CDKeyUtil.createCDkey("01", "0", "1");
            System.out.println("激活碼：" + CDKey);
            String deCDkey = CDKeyUtil.deCDkey(CDKey, "1");
            System.out.println("激活碼解密：" + deCDkey);
        }

    }