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Main.java
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package me.despawningbone.maicrypt;
import java.awt.GraphicsEnvironment;
import java.io.Console;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipParameters;
import org.apache.commons.compress.utils.IOUtils;
public class Main {
public static void main(String[] args) throws IOException, InterruptedException {
Console console = System.console();
if(console == null && !GraphicsEnvironment.isHeadless()){
String filename = Main.class.getProtectionDomain().getCodeSource().getLocation().toString().substring(6);
if(System.getProperty("os.name").contains("Win")) Runtime.getRuntime().exec(new String[]{"cmd", "/c", "start", "cmd", "/c", "java -jar \"" + filename + "\""});
}else{
System.out.println("-= maimai .bin data file decryption tool =-\n");
Boolean encrypt = null;
while (encrypt == null) {
System.out.print("Encrypt/decrypt (e/d)? ");
String line = System.console().readLine();
if (line.equalsIgnoreCase("e") || line.equalsIgnoreCase("d"))
encrypt = line.equalsIgnoreCase("e");
}
System.out.println("Selected " + (encrypt ? "encrypt" : "decrypt") + " mode.");
System.out.println("Please put the files in the same directory as the jar now (including a \"Keyfile.txt\" with only the key in hex form).");
String key = Files.readAllLines(new File("Keyfile.txt").toPath()).get(0).replaceAll("\\s+","");
String base, out;
if(encrypt) {
System.out.print("Output file name (the input file name should be the same as output but without file extension): ");
out = System.console().readLine();
base = out.substring(0, out.lastIndexOf("."));
compressGzip(base, base + "_EDITED.gz");
processFile(true, new File(base + "_EDITED.gz"), DatatypeConverter.parseHexBinary(key), new File(out));
} else {
System.out.print("Input file name: ");
String in = System.console().readLine();
base = in.substring(0, in.lastIndexOf("."));
processFile(false, new File(in), DatatypeConverter.parseHexBinary(key),
new File(base + ".gz"));
decompressGzip(base + ".gz", base);
out = base;
}
System.out.print("Done. Check the directory for the " + base + (encrypt ? "_EDITED" : "") + ".gz archive and the " + out + " file!\nPress any key to exit...");
System.console().readLine();
}
}
private static void processFile(boolean encrypt, File input, byte[] byteKey, File output) {
try (FileInputStream fileInputStream = new FileInputStream(input);
FileOutputStream fileOutputStream = new FileOutputStream(output)) {
Key key = new SecretKeySpec(byteKey, "AES");
byte[] inputBytes = new byte[(int) input.length()];
fileInputStream.read(inputBytes);
if(encrypt) { //append 16 bytes before encrypting
ByteBuffer buf = ByteBuffer.allocate(inputBytes.length + 16);
buf.put(new byte[16]);
buf.put(inputBytes);
inputBytes = buf.array();
}
byte[] iv = Arrays.copyOfRange(inputBytes, 0, 16);
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, key, ivspec);
byte[] outputBytes = cipher.doFinal(inputBytes);
if(!encrypt) outputBytes = Arrays.copyOfRange(outputBytes, 16, outputBytes.length);
fileOutputStream.write(outputBytes);
fileInputStream.close();
fileOutputStream.close();
} catch (IOException | NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
| InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
e.printStackTrace();
}
}
private static void compressGzip(String file, String gzipFile) {
GzipParameters param = new GzipParameters();
param.setFilename(file);
try (GzipCompressorOutputStream out = new GzipCompressorOutputStream(new FileOutputStream(gzipFile), param); FileInputStream fi = new FileInputStream(file)) {
IOUtils.copy(fi, out);
} catch (IOException e) {
e.printStackTrace();
}
}
private static void decompressGzip(String gzipFile, String file) {
try (GzipCompressorInputStream in = new GzipCompressorInputStream(new FileInputStream(gzipFile)); FileOutputStream fo = new FileOutputStream(file)) {
IOUtils.copy(in, fo);
} catch (IOException e) {
e.printStackTrace();
}
}
}

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Expires
Tue, Aug 5, 3:31 AM (21 h, 24 m)
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