[ideaIU]java的一种IDE

  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     }