#! /usr/bin/env runjs

requireJAR('bcprov-ext-jdk15on-154.jar');
requireJAR('crypto-1.0.jar');

var FileOutputStream = Packages.java.io.FileOutputStream;
var DecryptTool = Packages.me.hatter.tools.crypto.stream.DecryptTool;


var main = () => {
    if ($ARGS.length != 3) {
        xprintln('[ERROR] parameter error, decrypt.js AES_KEY FILE_NAME_ENC FILE_NAME');
        return;
    }
    var k = __.bytes.fromHex($ARGS[0]).bytes();
    var encF = $$.rFile($ARGS[1]);
    var dstF = $$.rFile($ARGS[2]);
    if (encF.notExists()) {
        xprintln('[ERROR] Enc file not exists.');
        return;
    }
    if (dstF.exists()) {
        xprintln('[ERROR] Dest file exists.');
        return;
    }
    var is = encF.inputStream();
    var dt = new DecryptTool(is, k);
    var os = dstF.outputStream();
    xprintln('[INFO] Descrypt ' + encF.file() + ' -> ' + dstF.file() + ' ...');
    dt.decrypt(os);
    os.close();
    is.close();
    xprintln('[OK] Decrypt file finished.');
};

main();