1     import java.math.BigInteger;
  2     import java.util.Date;
  3     import java.util.Random;
  4     import java.util.zip.CRC32;
  5
  6     public class keygen
  7     {
  8       /**
  9       * @param s
 10       * @param i
 11       * @param bytes
 12       * @return
 13       */
 14       public static short getCRC(String s, int i, byte bytes[])
 15       {
 16           CRC32 crc32 = new CRC32();
 17           if (s != null)
 18           {
 19               for (int j = 0; j < s.length(); j++)
 20               {
 21                   char c = s.charAt(j);
 22                   crc32.update(c);
 23               }
 24           }
 25           crc32.update(i);
 26           crc32.update(i >> 8);
 27           crc32.update(i >> 16);
 28           crc32.update(i >> 24);
 29           for (int k = 0; k < bytes.length - 2; k++)
 30           {
 31               byte byte0 = bytes[k];
 32               crc32.update(byte0);
 33           }
 34           return (short) (int) crc32.getValue();
 35       }
 36
 37       /**
 38       * @param biginteger
 39       * @return String
 40       */
 41       public static String encodeGroups(BigInteger biginteger)
 42       {
 43           BigInteger beginner1 = BigInteger.valueOf(0x39aa400L);
 44           StringBuilder sb = new StringBuilder();
 45           for (int i = 0; biginteger.compareTo(BigInteger.ZERO) != 0; i++)
 46           {
 47               int j = biginteger.mod(beginner1).intValue();
 48               String s1 = encodeGroup(j);
 49               if (i > 0)
 50               {
 51                   sb.append("-");
 52               }
 53               sb.append(s1);
 54               biginteger = biginteger.divide(beginner1);
 55           }
 56           return sb.toString();
 57       }
 58
 59       /**
 60       * @param i
 61       * @return
 62       */
 63       public static String encodeGroup(int i)
 64       {
 65           StringBuilder sb = new StringBuilder();
 66           for (int j = 0; j < 5; j++)
 67           {
 68               int k = i % 36;
 69               char c;
 70               if (k < 10)
 71               {
 72                   c = (char) (48 + k);
 73               }
 74               else
 75               {
 76                   c = (char) ((65 + k) - 10);
 77               }
 78               sb.append(c);
 79               i /= 36;
 80           }
 81           return sb.toString();
 82       }
 83
 84       /**
 85       * @param name
 86       * @param days
 87       * @param id
 88       * @param prtype
 89       * @return
 90       */
 91       public static String MakeKey(String name, int days, int id)
 92       {
 93           id %= 100000;
 94           byte bkey[] = new byte[12];
 95           bkey[0] = (byte) 1; // Product type: IntelliJ IDEA is 1
 96           bkey[1] = 14; // version
 97           Date d = new Date();
 98           long ld = (d.getTime() >> 16);
 99           bkey[2] = (byte) (ld & 255);
100           bkey[3] = (byte) ((ld >> 8) & 255);
101           bkey[4] = (byte) ((ld >> 16) & 255);
102           bkey[5] = (byte) ((ld >> 24) & 255);
103           days &= 0xffff;
104           bkey[6] = (byte) (days & 255);
105           bkey[7] = (byte) ((days >> 8) & 255);
106           bkey[8] = 105;
107           bkey[9] = -59;
108           bkey[10] = 0;
109           bkey[11] = 0;
110           int w = getCRC(name, id % 100000, bkey);
111           bkey[10] = (byte) (w & 255);
112           bkey[11] = (byte) ((w >> 8) & 255);
113           BigInteger pow = new BigInteger("89126272330128007543578052027888001981", 10);
114           BigInteger mod = new BigInteger("86f71688cdd2612ca117d1f54bdae029", 16);
115           BigInteger k0 = new BigInteger(bkey);
116           BigInteger k1 = k0.modPow(pow, mod);
117           String s0 = Integer.toString(id);
118           String sz = "0";
119           while (s0.length() != 5)
120           {
121               s0 = sz.concat(s0);
122           }
123           s0 = s0.concat("-");
124           String s1 = encodeGroups(k1);
125           s0 = s0.concat(s1);
126           return s0;
127       }
128
129       public static void main(String[] args)
130       {
131           if (args.length == 0)
132           {
133               System.err.printf("*** Usage: %s name%n", keygen.class.getCanonicalName());
134               System.exit(1);
135           }
136           Random r = new Random();
137           System.out.println(MakeKey(args[0], 0, r.nextInt(100000)));
138       }
139     }