kTAit5xe

1import java.security.*;
2import javax.crypto.*;
3import javax.crypto.spec.*;
4import java.io.*;
5
6// First argument: decryption key
7// Second argument: file input path
8// Third argument: file output path
9
10public class Main {
11    public static void main(String[] args) throws InvalidAlgorithmParameterException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, IOException, IllegalBlockSizeException, BadPaddingException {
12        System.out.println("Processing file: " + args[1]);
13
14        String key = args[0];
15        File fileIn = new File(args[1]), fileOut = new File(args[2]);
16
17        Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
18        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
19        cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(new byte[16]));
20
21        InputStream in = new FileInputStream(fileIn);
22        byte[] encrypted = new byte[(int)fileIn.length()];
23        in.read(encrypted);
24        in.close();
25
26        byte[] decrypted = cipher.doFinal(encrypted);
27        OutputStream out = new FileOutputStream(fileOut);
28        out.write(decrypted);
29        out.close();
30
31        System.out.println("Done: outputted file to " + args[2]);
32    }
33}