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) { 

    } 

}