MyEclipse 註冊碼生成器：Java 實現與原理解析

在早期的 MyEclipse 7.1 版本中，開發者常需自行生成註冊碼以啟用產品。本文介紹一個純 Java 實現的註冊碼生成類，經測試在 Windows XP SP3 環境下可正常運行。只需輸入任意用戶名，程式即可在控制台輸出對應的序列號。

運行示例

please input register name:
zxf261
Serial:mLR8ZC-855575-67516256535054053

核心原始碼解析

該生成器採用字元編碼與雜湊運算相結合的方式，核心邏輯包含三個關鍵方法：

• getSerial()：組裝基礎字串，包含用戶 ID、授權類型（YE3MP-）、授權編號、版本時間戳及版權聲明常量 LL，最後經過編碼與變換生成最終序列號。
• decode()：採用 31 為基數的多項式滾動雜湊算法，計算字串的整數雜湊值。
• change()：對字串進行字元級位移變換，數字循環位移 5 位，大小寫字母分別循環位移 13 位（ROT13 變體）。

完整原始碼

package com.zxf261;
import java.io.*;

public class MyEclipseGen {
    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 (https://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 = 0;
        char[] ac = s.toCharArray();
        for (int j = 0, k = ac.length; j < k; j++) {
            i = (31 * i) + ac[j];
        }
        return Math.abs(i);
    }

    private String change(String s) {
        byte[] abyte0 = s.getBytes();
        char[] ac = new char[s.length()];
        for (int i = 0, k = abyte0.length; i < k; i++) {
            int 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;
        }
        return String.valueOf(ac);
    }

    public static void main(String[] args) {
        try {
            System.out.println("please input register name:");
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
            String userId = reader.readLine();
            MyEclipseGen myeclipsegen = new MyEclipseGen();
            String res = myeclipsegen.getSerial(userId, "20");
            System.out.println("Serial:" + res);
            reader.readLine();
        } catch (IOException ex) {
        }
    }
}

來源聲明：本文轉載自「richard的筆記-積微成著」博客，原文地址：https://zxf261.blog.51cto.com/701797/722192