Initial Commit
This commit is contained in:
Rekai Musuka
commit
17672ce114
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/target
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# This file is automatically @generated by Cargo.
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name = "winapi-x86_64-pc-windows-gnu"
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@ -0,0 +1,11 @@
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[package]
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name = "rpgmv_decryptor"
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version = "0.1.0"
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authors = ["Rekai Musuka <musukarekai@gmail.com>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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anyhow = "1.0.31"
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clap = "2.33.1"
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@ -0,0 +1,146 @@
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use anyhow::{anyhow, Context, Result};
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use clap::{App, Arg};
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use std::fs::File;
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use std::io::{Read, Write};
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use std::path::Path;
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/// # RPGMV Decryptor
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///
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fn main() -> Result<()> {
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let matches = App::new("RPGMV Decoder")
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.version("0.1.0")
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.author("paoda <musukarekai@gmail.com>")
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.about("Decodes .rpgmvp, .rpgmvm and .rpgmvo files")
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.arg(
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Arg::with_name("path")
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.index(1)
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.value_name("FILE")
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.help("Path to the file which will be decrypted")
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.takes_value(true)
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.required(true),
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)
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.arg(
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Arg::with_name("key")
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.short("k")
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.long("key")
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.value_name("KEY")
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.help("The Encryption Key (look in www/data/System.json or www/js/rpg_core.js")
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.takes_value(true)
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.required(true),
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)
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.get_matches();
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let path_string = matches.value_of("path").context("No file path provided")?;
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let key_string = matches.value_of("key").context("No key provided")?;
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let path = Path::new(path_string);
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let key = get_key_bytes(key_string)?;
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// let default_rpgmv_header: [u8; 16] = [
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// 0x52, 0x50, 0x47, 0x4d, 0x56, 0x00, 0x00, 0x00, 0x00, 0x3, 0x1, 0x00, 0x00, 0x00, 0x00,
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// 0x00,
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// ];
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let file_buf = get_file_data(path)?;
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let decrypted = decrypt(file_buf, key);
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let mut file;
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let filename = path
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.file_stem()
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.context("Unable to determine file stem")?
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.to_str()
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.context("Unable to convert file stem to UTF-8 string")?;
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match detect_original_extension(path)? {
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RPGFile::Photo => file = File::create(format!("{}.png", filename))?, // .rpgmvps are .pngs
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RPGFile::Video => file = File::create(format!("{}.m4a", filename))?, // .rpgmvms are .m4as
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RPGFile::Audio => file = File::create(format!("{}.ogg", filename))?, // .rpgmvos are .oggs
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}
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file.write_all(&decrypted)?;
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Ok(())
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}
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/// Determines the original file type for the encrypted .rpgmv* file
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fn detect_original_extension<P: AsRef<Path>>(path: P) -> Result<RPGFile> {
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match path.as_ref().extension() {
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Some(ext) => {
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let ext = ext
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.to_str()
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.context("File extension was not UTF-8 Compatible")?;
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match ext {
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"rpgmvp" => Ok(RPGFile::Photo),
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"rpgmvm" => Ok(RPGFile::Video),
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"rpgmvo" => Ok(RPGFile::Audio),
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_ => Err(anyhow!("File was lacking a supported file extension")),
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}
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}
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None => Err(anyhow!("File is lacking a file extension")),
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}
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}
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/// get_key_bytes takes a 32-character hexadecimal string and interperets
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/// every two characters as an unsined 8-bit integer.
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///
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/// # Examples
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/// `71e7bdd9b28010980c2a4e8a1386e100` will be split up as:
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///
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/// `0x71`, `0xe7`, `0xbd`, `0xd9`, `0xb2`, `0x80`, `0x10`, `0x98`, `0x0c`, `0x2a`, `0x4e`, `0x8a`, `0x13`, `0x86`, `0xe1`, and `0x00`
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fn get_key_bytes(key: &str) -> Result<Vec<u8>> {
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let sub_len = 2;
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let mut key_buf = Vec::with_capacity(key.len() / 2);
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let mut chars = key.chars();
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let sub_strings = (0..)
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.map(|_| chars.by_ref().take(sub_len).collect::<String>())
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.take_while(|s| !s.is_empty())
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.collect::<Vec<_>>();
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for string in sub_strings {
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key_buf.push(u8::from_str_radix(&string, 16)?);
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}
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Ok(key_buf)
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}
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/// get_file_data returns a buffer containing a data of a file which is on disk.
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fn get_file_data<P: AsRef<Path>>(path: P) -> Result<Vec<u8>> {
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let mut buf = Vec::new();
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let mut file = File::open(path.as_ref())?;
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file.read_to_end(&mut buf)?;
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Ok(buf)
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}
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fn _encrypt(_bytes: Vec<u8>, _key: Vec<u8>) -> Vec<u8> {
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unimplemented!();
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}
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/// Decrypts a RPGMV media file
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///
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/// The only part of the data that is actually encrypted (read: has a cipher applied to it)
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/// is the header of the original file, which is bytes 17 -> 33 (16 bytes). Our key provides us with
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/// 16 values which we can use to perform a bitwise XOR. The bitwise XOR will undo the cipher, returning the header to
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/// it's original position. At this point, byte #17 -> end of file will now be recognized as their respected unencrypted
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// file formats.
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fn decrypt(bytes: Vec<u8>, key: Vec<u8>) -> Vec<u8> {
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let mut decrypted = bytes[16..].to_owned(); // Throw out the first 16 bytes (the RPGMV Header)
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for i in 0..16 as usize {
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decrypted[i as usize] = decrypted[i] ^ key[i];
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}
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decrypted
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}
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/// An enum that represents the types of supported RPGMV media files.
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enum RPGFile {
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Photo,
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Video,
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Audio,
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}
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