Idea keygen generates key code

ImportJava.math.BigInteger;Importjava.util.Date;ImportJava.util.Random;Importjava.util.zip.CRC32; Public classkeygen {/**     * @paramS *@paramI *@parambytes *@return     */     Public Static  ShortGETCRC (String S,intIbytebytes[]) {CRC32 CRC32=NewCRC32 (); if(s! =NULL) {             for(intj = 0; J < S.length (); J + +) {                Charc =S.charat (j);            Crc32.update (c);        }} crc32.update (i); Crc32.update (i>> 8); Crc32.update (i>> 16); Crc32.update (i>> 24);  for(intk = 0; K < bytes.length-2; k++) {            byteBYTE0 =Bytes[k];        Crc32.update (BYTE0); }        return( Short) (int) Crc32.getvalue (); }    /**     * @paramBigInteger *@returnString*/     Public StaticString encodegroups (BigInteger BigInteger) {BigInteger beginner1= Biginteger.valueof (0x39aa400l); StringBuilder SB=NewStringBuilder ();  for(inti = 0; Biginteger.compareto (biginteger.zero)! = 0; i++) {            intj =Biginteger.mod (beginner1). Intvalue (); String S1=Encodegroup (j); if(I > 0) {sb.append ("-");            } sb.append (S1); BigInteger=biginteger.divide (Beginner1); }        returnsb.tostring (); }    /**     * @paramI *@return     */     Public StaticString Encodegroup (inti) {StringBuilder sb=NewStringBuilder ();  for(intj = 0; J < 5; J + +) {            intK = i% 36; CharC; if(K < 10) {C= (Char) (48 +k); } Else{C= (Char) ((+ + k)-10);            } sb.append (c); I/= 36; }        returnsb.tostring (); }    /**     * @paramname *@paramDays *@paramID *@paramPrtype *@return     */     Public StaticString Makekey (string name,intDaysintID) {ID%= 100000; byteBkey[] =New byte[12]; bkey[0] = (byte) 1;//Product Type:intellij idea is 1BKEY[1] = 14;//versionDate d =NewDate (); LongLD = (D.gettime () >> 16); bkey[2] = (byte) (LD & 255); bkey[3] = (byte) ((LD >> 8) & 255); bkey[4] = (byte) ((LD >> +) & 255); bkey[5] = (byte) ((LD >> +) & 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; intw = GETCRC (name, id% 100000, Bkey); bkey[10] = (byte) (W & 255); bkey[11] = (byte) ((w >> 8) & 255); BigInteger POW=NewBigInteger ("89126272330128007543578052027888001981", 10); BigInteger MoD=NewBigInteger ("86f71688cdd2612ca117d1f54bdae029", 16); BigInteger K0=NewBigInteger (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); returnS0; }     Public Static voidMain (string[] args) {if(Args.length = = 0) {System.err.printf ("* * * Usage:%s name%n", keygen.class. Getcanonicalname ()); System.exit (1); } Random R=NewRandom (); System.out.println (Makekey (args[0], 0, R.nextint (100000))); }}

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