本文共 3416 字，大约阅读时间需要 11 分钟。

Java文件代码：

import java.math.BigInteger; import java.util.Date; import java.util.Random; import java.util.Scanner; import java.util.zip.CRC32; public class KeyGen {
     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();     }     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();     }     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();     }     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){
         System.out.println("请输入用户名:");         Scanner scanner = new Scanner(System.in);         String username = scanner.next();         Random r = new Random();         System.out.println(MakeKey(username, 0, r.nextInt(100000)));     } }

运行这段代码即可得到破解码

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