Intellj IDEA 序列号生成代码

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package com.juxuny.test;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  * @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("juxuny", 0, r.nextInt(100000)));  }}
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