import java.math.BigInteger;
import java.util.Date;
import java.util.Random;
import java.util.zip.CRC32;
/**
* Created by SongpoLiu on 2014/11/8.
*/
public class Keygen {
private static final int version = 14;
/**
* @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] = 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) {
Random r = new Random();
String username = "huangxf";
String key = MakeKey(username, 0, r.nextInt(Integer.MAX_VALUE));
System.out.println("用户名:" + username + "\n注册码:" + key);
}
}