osc.git.eh3.viplugin.CheckLicenseFile.java Source code

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Here is the source code for osc.git.eh3.viplugin.CheckLicenseFile.java

Source

package osc.git.eh3.viplugin;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

public class CheckLicenseFile {
    private static final String publicKey = "308201b83082012d";
    private static SecretKeySpec key;
    private static Cipher cipher;
    private static byte[] linebreak = new byte[0];
    private static Base64 coder;

    static {
        try {
            key = new SecretKeySpec("308201b83082012d".getBytes(), "AES");
            cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            coder = new Base64(32, linebreak, true);
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

    public static boolean checkLicenseLocations(String[] paths) throws Exception {
        String path = "";
        boolean found = false;
        for (int i = 0; i < paths.length; i++) {
            path = paths[i] + "viPlugin2.lic";
            if (new File(path).exists()) {
                found = true;
                break;
            }
            path = paths[i] + "viplugin2.lic";
            if (new File(path).exists()) {
                found = true;
                break;
            }
        }
        if (!found) {
            throw new Exception(
                    "License should be in one of the following locations:\n" + paths[0] + "\n" + paths[1]);
        }
        return checkLicenseFile(path);
    }

    private static boolean checkLicenseFile(String fileName) throws Exception {
        char[] buffer = new char[(int) new File(fileName).length()];
        try {
            FileReader fileReader = new FileReader(fileName);
            fileReader.read(buffer);
            fileReader.close();
        } catch (FileNotFoundException e) {
            throw new Exception("License file not found: " + fileName);
        } catch (IOException e) {
            throw new Exception("Can't read license file: " + fileName);
        }
        FileReader fileReader;
        String license = new String(buffer);
        if (!decrypt(license)) {
            throw new Exception("Invalid license found: " + fileName);
        }
        return true;
    }

    public static synchronized String encrypt(String name, String email) throws Exception {
        String plainText = name + "viPlugin 2.0" + email;
        cipher.init(1, key);
        byte[] cipherText = cipher.doFinal(plainText.getBytes());
        return new String(coder.encode(cipherText));
    }

    public static synchronized boolean decrypt(String codedText) throws Exception {
        byte[] encypted = coder.decode(codedText.getBytes());
        cipher.init(2, key);
        byte[] decrypted = cipher.doFinal(encypted);
        String decoded = new String(decrypted);
        return decoded.contains("viPlugin 2.0");
    }
}