commit 17672ce114c1d58d12ee8841a6a1165b9f0a9b9e Author: Rekai Musuka Date: Mon Jun 1 21:35:45 2020 -0500 Initial Commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..d3d4ab8 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,120 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "ansi_term" +version = "0.11.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b" +dependencies = [ + "winapi", +] + +[[package]] +name = "anyhow" +version = "1.0.31" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "85bb70cc08ec97ca5450e6eba421deeea5f172c0fc61f78b5357b2a8e8be195f" + +[[package]] +name = "atty" +version = "0.2.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8" +dependencies = [ + "hermit-abi", + "libc", + "winapi", +] + +[[package]] +name = "bitflags" +version = "1.2.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693" + +[[package]] +name = "clap" +version = "2.33.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "bdfa80d47f954d53a35a64987ca1422f495b8d6483c0fe9f7117b36c2a792129" +dependencies = [ + "ansi_term", + "atty", + "bitflags", + "strsim", + "textwrap", + "unicode-width", + "vec_map", +] + +[[package]] +name = "hermit-abi" +version = "0.1.13" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "91780f809e750b0a89f5544be56617ff6b1227ee485bcb06ebe10cdf89bd3b71" +dependencies = [ + "libc", +] + +[[package]] +name = "libc" +version = "0.2.71" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9457b06509d27052635f90d6466700c65095fdf75409b3fbdd903e988b886f49" + +[[package]] +name = "rpgmv_decryptor" +version = "0.1.0" +dependencies = [ + "anyhow", + "clap", +] + +[[package]] +name = "strsim" +version = "0.8.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a" + +[[package]] +name = "textwrap" +version = "0.11.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060" +dependencies = [ + "unicode-width", +] + +[[package]] +name = "unicode-width" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479" + +[[package]] +name = "vec_map" +version = "0.8.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191" + +[[package]] +name = "winapi" +version = "0.3.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6" +dependencies = [ + "winapi-i686-pc-windows-gnu", + "winapi-x86_64-pc-windows-gnu", +] + +[[package]] +name = "winapi-i686-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" + +[[package]] +name = "winapi-x86_64-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..93766d9 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "rpgmv_decryptor" +version = "0.1.0" +authors = ["Rekai Musuka "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +anyhow = "1.0.31" +clap = "2.33.1" \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..655f855 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,146 @@ +use anyhow::{anyhow, Context, Result}; +use clap::{App, Arg}; +use std::fs::File; +use std::io::{Read, Write}; +use std::path::Path; + +/// # RPGMV Decryptor +/// +fn main() -> Result<()> { + let matches = App::new("RPGMV Decoder") + .version("0.1.0") + .author("paoda ") + .about("Decodes .rpgmvp, .rpgmvm and .rpgmvo files") + .arg( + Arg::with_name("path") + .index(1) + .value_name("FILE") + .help("Path to the file which will be decrypted") + .takes_value(true) + .required(true), + ) + .arg( + Arg::with_name("key") + .short("k") + .long("key") + .value_name("KEY") + .help("The Encryption Key (look in www/data/System.json or www/js/rpg_core.js") + .takes_value(true) + .required(true), + ) + .get_matches(); + + let path_string = matches.value_of("path").context("No file path provided")?; + let key_string = matches.value_of("key").context("No key provided")?; + + let path = Path::new(path_string); + let key = get_key_bytes(key_string)?; + + // let default_rpgmv_header: [u8; 16] = [ + // 0x52, 0x50, 0x47, 0x4d, 0x56, 0x00, 0x00, 0x00, 0x00, 0x3, 0x1, 0x00, 0x00, 0x00, 0x00, + // 0x00, + // ]; + + let file_buf = get_file_data(path)?; + let decrypted = decrypt(file_buf, key); + + let mut file; + + let filename = path + .file_stem() + .context("Unable to determine file stem")? + .to_str() + .context("Unable to convert file stem to UTF-8 string")?; + + match detect_original_extension(path)? { + RPGFile::Photo => file = File::create(format!("{}.png", filename))?, // .rpgmvps are .pngs + RPGFile::Video => file = File::create(format!("{}.m4a", filename))?, // .rpgmvms are .m4as + RPGFile::Audio => file = File::create(format!("{}.ogg", filename))?, // .rpgmvos are .oggs + } + + file.write_all(&decrypted)?; + + Ok(()) +} + +/// Determines the original file type for the encrypted .rpgmv* file +fn detect_original_extension>(path: P) -> Result { + match path.as_ref().extension() { + Some(ext) => { + let ext = ext + .to_str() + .context("File extension was not UTF-8 Compatible")?; + + match ext { + "rpgmvp" => Ok(RPGFile::Photo), + "rpgmvm" => Ok(RPGFile::Video), + "rpgmvo" => Ok(RPGFile::Audio), + _ => Err(anyhow!("File was lacking a supported file extension")), + } + } + None => Err(anyhow!("File is lacking a file extension")), + } +} + +/// get_key_bytes takes a 32-character hexadecimal string and interperets +/// every two characters as an unsined 8-bit integer. +/// +/// # Examples +/// `71e7bdd9b28010980c2a4e8a1386e100` will be split up as: +/// +/// `0x71`, `0xe7`, `0xbd`, `0xd9`, `0xb2`, `0x80`, `0x10`, `0x98`, `0x0c`, `0x2a`, `0x4e`, `0x8a`, `0x13`, `0x86`, `0xe1`, and `0x00` +fn get_key_bytes(key: &str) -> Result> { + let sub_len = 2; + + let mut key_buf = Vec::with_capacity(key.len() / 2); + + let mut chars = key.chars(); + let sub_strings = (0..) + .map(|_| chars.by_ref().take(sub_len).collect::()) + .take_while(|s| !s.is_empty()) + .collect::>(); + + for string in sub_strings { + key_buf.push(u8::from_str_radix(&string, 16)?); + } + + Ok(key_buf) +} + +/// get_file_data returns a buffer containing a data of a file which is on disk. +fn get_file_data>(path: P) -> Result> { + let mut buf = Vec::new(); + + let mut file = File::open(path.as_ref())?; + file.read_to_end(&mut buf)?; + + Ok(buf) +} + +fn _encrypt(_bytes: Vec, _key: Vec) -> Vec { + unimplemented!(); +} + +/// Decrypts a RPGMV media file +/// +/// The only part of the data that is actually encrypted (read: has a cipher applied to it) +/// is the header of the original file, which is bytes 17 -> 33 (16 bytes). Our key provides us with +/// 16 values which we can use to perform a bitwise XOR. The bitwise XOR will undo the cipher, returning the header to +/// it's original position. At this point, byte #17 -> end of file will now be recognized as their respected unencrypted +// file formats. +fn decrypt(bytes: Vec, key: Vec) -> Vec { + let mut decrypted = bytes[16..].to_owned(); // Throw out the first 16 bytes (the RPGMV Header) + + for i in 0..16 as usize { + decrypted[i as usize] = decrypted[i] ^ key[i]; + } + + decrypted +} + +/// An enum that represents the types of supported RPGMV media files. +enum RPGFile { + Photo, + Video, + Audio, +}