import java.math.BigInteger;

import java.util.Date;

import java.util.Random;

import java.util.Scanner;

import java.util.zip.CRC32;

public class KeyGen {

    public static short getCRC(String s, int i, byte bytes[]){

        CRC32 crc32 = new CRC32();

        if (s != null)

        {

            for (int j = 0; j < s.length(); j++)

            {

                char c = s.charAt(j);

                crc32.update(c);

            }

        }

        crc32.update(i);

        crc32.update(i >> 8);

        crc32.update(i >> 16);

        crc32.update(i >> 24);

        for (int k = 0; k < bytes.length - 2; k++)

        {

            byte byte0 = bytes[k];

            crc32.update(byte0);

        }

        return (short) (int) crc32.getValue();

    }

    public static String encodeGroups(BigInteger biginteger){

        BigInteger beginner1 = BigInteger.valueOf(0x39aa400L);

        StringBuilder sb = new StringBuilder();

        for (int i = 0; biginteger.compareTo(BigInteger.ZERO) != 0; i++)

        {

            int j = biginteger.mod(beginner1).intValue();

            String s1 = encodeGroup(j);

            if (i > 0)

            {

                sb.append("-");

            }

            sb.append(s1);

            biginteger = biginteger.divide(beginner1);

        }

        return sb.toString();

    }

    public static String encodeGroup(int i){

        StringBuilder sb = new StringBuilder();

        for (int j = 0; j < 5; j++)

        {

            int k = i % 36;

            char c;

            if (k < 10)

            {

                c = (char) (48 + k);

            }

            else

            {

                c = (char) ((65 + k) - 10);

            }

            sb.append(c);

            i /= 36;

        }

        return sb.toString();

    }

    public static String MakeKey(String name, int days, int id){

        id %= 100000;

        byte bkey[] = new byte[12];

        bkey[0] = (byte) 1; // Product type: IntelliJ IDEA is 1

        bkey[1] = 14; // version

        Date d = new Date();

        long ld = (d.getTime() >> 16);

        bkey[2] = (byte) (ld & 255);

        bkey[3] = (byte) ((ld >> 8) & 255);

        bkey[4] = (byte) ((ld >> 16) & 255);

        bkey[5] = (byte) ((ld >> 24) & 255);

        days &= 0xffff;

        bkey[6] = (byte) (days & 255);

        bkey[7] = (byte) ((days >> 8) & 255);

        bkey[8] = 105;

        bkey[9] = -59;

        bkey[10] = 0;

        bkey[11] = 0;

        int w = getCRC(name, id % 100000, bkey);

        bkey[10] = (byte) (w & 255);

        bkey[11] = (byte) ((w >> 8) & 255);

        BigInteger pow = new BigInteger("89126272330128007543578052027888001981", 10);

        BigInteger mod = new BigInteger("86f71688cdd2612ca117d1f54bdae029", 16);

        BigInteger k0 = new BigInteger(bkey);

        BigInteger k1 = k0.modPow(pow, mod);

        String s0 = Integer.toString(id);

        String sz = "0";

        while (s0.length() != 5)

        {

            s0 = sz.concat(s0);

        }

        s0 = s0.concat("-");

        String s1 = encodeGroups(k1);

        s0 = s0.concat(s1);

        return s0;

    }

    public static void main(String[] args){

        System.out.println("请输入用户名:");

        Scanner scanner = new Scanner(System.in);

        String username = scanner.next();

        Random r = new Random();

        System.out.println(MakeKey(username, 0, r.nextInt(100000)));

    }

}