package cc.dfsoft.cc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class MyEclipseKeyGen {
private static final String LL = “Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.”;

public String getSerial(String userId, String licenseNum) {  
    java.util.Calendar cal = java.util.Calendar.getInstance();  
    cal.add(1, 3);  
    cal.add(6, -1);  
    java.text.NumberFormat nf = new java.text.DecimalFormat("000");  
    licenseNum = nf.format(Integer.valueOf(licenseNum));  
    String verTime = new StringBuilder("-").append(  
            new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))  
            .append("0").toString();  
    String type = "YE3MP-";  
    String need = new StringBuilder(userId.substring(0, 1)).append(type)  
            .append("300").append(licenseNum).append(verTime).toString();  
    String dx = new StringBuilder(need).append(LL).append(userId)  
            .toString();  
    int suf = this.decode(dx);  
    String code = new StringBuilder(need).append(String.valueOf(suf))  
            .toString();  
    return this.change(code);  
}  

private int decode(String s) {  
    int i;  
    char[] ac;  
    int j;  
    int k;  
    i = 0;  
    ac = s.toCharArray();  
    j = 0;  
    k = ac.length;  
    while (j < k) {  
        i = (31 * i) + ac[j];  
        j++;  
    }  
    return Math.abs(i);  
}  

private String change(String s) {  
    byte[] abyte0;  
    char[] ac;  
    int i;  
    int k;  
    int j;  
    abyte0 = s.getBytes();  
    ac = new char[s.length()];  
    i = 0;  
    k = abyte0.length;  
    while (i < k) {  
        j = abyte0[i];  
        if ((j >= 48) && (j <= 57)) {  
            j = (((j - 48) + 5) % 10) + 48;  
        } else if ((j >= 65) && (j <= 90)) {  
            j = (((j - 65) + 13) % 26) + 65;  
        } else if ((j >= 97) && (j <= 122)) {  
            j = (((j - 97) + 13) % 26) + 97;  
        }  
        ac[i] = (char) j;  
        i++;  
    }  
    return String.valueOf(ac);  
}  

public MyEclipseKeyGen() {  
    super();  
}  

public static void main(String[] args) {  
    try {  
        System.out.println("please input register name:");  
        BufferedReader reader = new BufferedReader(new InputStreamReader(  
                System.in));  
        String userId = null;  
        userId = reader.readLine();  
        MyEclipseKeyGen myeclipsekeygen = new MyEclipseKeyGen();  
        String res = myeclipsekeygen.getSerial(userId, "5");  
        System.out.println("Serial:" + res);  
        reader.readLine();  
    } catch (IOException ex) {  
    }  
}  

}