import java.math.BigInteger;

import java.util.Date;

import java.util.Random;

import java.util.zip.CRC32;

public class keygen

{

/**

  • @param s

  • @param i

  • @param bytes

  • @return

*/

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();

}

/**

  • @param biginteger

  • @return String

*/

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();

}

/**

  • @param i

  • @return

*/

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();

}

/**

  • @param name

  • @param days

  • @param id

  • @param prtype

  • @return

*/

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)

{

if (args.length == 0)

{

System.err.printf("*** Usage: %s name%n”, keygen.class.getCanonicalName());

System.exit(1);

}

Random r = new Random();

System.out.println(MakeKey(args[0], 0, r.nextInt(100000)));

}

}