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 1bkey[1] = 14; // versionDate 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)));}
}