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[package]
name = "renbin"
description = "Split files into compressed and encrypted chunks, then store them in pastebins"
authors = ["trisuaso"]
version = "0.1.0"
edition = "2024"
repository = "https://trisua.com/t/renbin"
license = "AGPL-3.0-or-later"
[dependencies]
aes-gcm = "0.10.3"
clap = { version = "4.5.39", features = ["derive"] }
flate2 = "1.1.2"
reqwest = "0.12.19"
serde = { version = "1.0.219", features = ["derive"] }
toml = "0.8.23"
rand = "0.9.1"
base64 = "0.22.1"
pathbufd = "0.1.4"
tokio = { version = "1.45.1", features = ["macros", "rt-multi-thread"] }
[[bin]]
name = "renbin"
path = "./src/main.rs"

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GNU AFFERO GENERAL PUBLIC LICENSE
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If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# renbin
Split files into chunks and then save them on rentry.co as encrypted, compressed, base64 strings.
## Usage
Split and save file:
```
renbin -i ./path/to/file.ext -e rentry
```
Restore file from remote:
```
renbin -i ./path/to/file.ext.toml -e rentry -d
```
Delete file and all chunk off remote:
```
renbin -i ./path/to/file.ext.toml -e rentry -x
```
### Local
You can also store files locally using `-e fs` (`--engine fs`). This mode is generally **_much_** quicker. This is the mode that will be used by default if no engine flag is provided.
Local files are split into chunks of exactly 200 KB, while the rentry engine splits files into chunks of 150 KB. While larger chunks _could_ be used, that's not as fun.

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use super::Engine;
use crate::{FileDescriptor, decrypt_deflate, encrypt_compress, salt};
use pathbufd::PathBufD;
use std::{
collections::HashMap,
fs::{read_to_string, remove_file, write},
io::Result,
};
pub struct FsEngine;
impl Engine for FsEngine {
const CHUNK_SIZE: usize = 200_000;
async fn auth(&mut self) -> Result<()> {
unreachable!("Not needed");
}
async fn process(&self, name: String, data: Vec<u8>) -> Result<FileDescriptor> {
let (seed, key, data) = encrypt_compress(data);
let mut descriptor = FileDescriptor {
name,
key,
seed,
engine_data: HashMap::new(),
chunks: Vec::new(),
};
for chunk in data.as_bytes().chunks(Self::CHUNK_SIZE) {
let id = salt();
self.create_chunk(&id, String::from_utf8(chunk.to_vec()).unwrap())
.await?;
descriptor.chunks.push(id);
}
descriptor.write(PathBufD::current().join(format!("{}.toml", descriptor.name)))?;
Ok(descriptor)
}
async fn reconstruct(&self, descriptor: FileDescriptor) -> Result<()> {
let mut encoded_string: String = String::new();
for chunk in descriptor.chunks {
encoded_string += &self.get_chunk(&chunk).await?;
}
let decoded = decrypt_deflate(descriptor.seed, descriptor.key, encoded_string);
write(PathBufD::current().join(descriptor.name), decoded)?;
Ok(())
}
async fn delete(&mut self, descriptor: FileDescriptor) -> Result<()> {
for chunk in descriptor.chunks {
self.delete_chunk(&chunk).await?;
}
Ok(())
}
async fn get_chunk(&self, id: &str) -> Result<String> {
read_to_string(PathBufD::new().join(id))
}
async fn create_chunk(&self, id: &str, data: String) -> Result<String> {
write(PathBufD::new().join(id), data)?;
Ok(String::new())
}
async fn delete_chunk(&self, id: &str) -> Result<()> {
remove_file(PathBufD::new().join(id))
}
}

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#![allow(async_fn_in_trait)]
pub mod fs;
pub mod rentry;
use std::io::Result;
use crate::FileDescriptor;
/// An engine that drives remote storage.
pub trait Engine {
const CHUNK_SIZE: usize;
/// Returns authentication details (CSRF token, session token, etc).
async fn auth(&mut self) -> Result<()>;
/// Processes a file and returns a [`FileDescriptor`].
async fn process(&self, name: String, data: Vec<u8>) -> Result<FileDescriptor>;
/// Reads a [`FileDescriptor`] and recreates the file.
async fn reconstruct(&self, descriptor: FileDescriptor) -> Result<()>;
/// Reads a [`FileDescriptor`] and deletes the file.
async fn delete(&mut self, descriptor: FileDescriptor) -> Result<()>;
/// Gets the data in a chunk by its ID.
async fn get_chunk(&self, id: &str) -> Result<String>;
/// Creates a new chunk and sends it to remote.
async fn create_chunk(&self, id: &str, data: String) -> Result<String>;
/// Deletes a specific chunk from the remote. Used to clean up remote data
/// when deleting a file.
async fn delete_chunk(&self, id: &str) -> Result<()>;
}

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use super::Engine;
use crate::{FileDescriptor, decrypt_deflate, encrypt_compress, salt};
use pathbufd::PathBufD;
use reqwest::{Client, StatusCode};
use std::{
collections::HashMap,
fs::write,
io::{Error, Result},
time::Duration,
};
use tokio::task::JoinHandle;
pub struct RentryEngine {
pub http: Client,
pub csrf_token: Option<String>,
}
impl RentryEngine {
pub fn new() -> Self {
Self {
http: Client::new(),
csrf_token: None,
}
}
pub async fn get_csrf(&self, url: &str) -> String {
println!("start: extract token {}", url);
let body = self
.http
.get(url)
.send()
.await
.unwrap()
.text()
.await
.unwrap();
let token = body
.split("name=\"csrfmiddlewaretoken\" value=\"")
.skip(1)
.next()
.unwrap()
.split("\"")
.next()
.unwrap()
.to_string();
println!("start: token obtained");
token
}
}
impl Engine for RentryEngine {
const CHUNK_SIZE: usize = 150_000; // chunks are given 8 bytes for extra characters
async fn auth(&mut self) -> Result<()> {
self.csrf_token = Some(self.get_csrf("https://rentry.co").await);
Ok(())
}
async fn process(&self, name: String, data: Vec<u8>) -> Result<FileDescriptor> {
let token = if let Some(ref token) = self.csrf_token {
token.to_owned()
} else {
return Err(Error::other("no csrf token extracted"));
};
let (seed, key, data) = encrypt_compress(data);
let mut descriptor = FileDescriptor {
name,
key,
seed,
engine_data: {
let mut data = HashMap::new();
data.insert("token".to_string(), token);
data
},
chunks: Vec::new(),
};
let chars = data.chars().collect::<Vec<char>>();
let chunks = chars.chunks(Self::CHUNK_SIZE);
let chunks_num = chunks.len();
let mut handles: Vec<JoinHandle<()>> = Vec::new();
for (i, chunk) in chunks.enumerate() {
let id = salt();
println!("cnksv: start chunk save ({}/{chunks_num})", i + 1);
// spawn worker thread
let c = chunk.to_vec();
let mut worker_engine = Self::new();
worker_engine.csrf_token = self.csrf_token.clone();
let id_c = id.clone();
tokio::time::sleep(Duration::from_millis(750)).await; // sleep to avoid rate limit
let handle = tokio::spawn(async move {
let mut b = worker_engine
.create_chunk(&id_c, c.iter().collect())
.await
.expect("failed to create chunk");
while b.contains("e436") {
println!(
"\x1b[91mcnksv: upload failed (hit limit on {})\x1b[0m",
i + 1
);
println!("cnksv: creation limit reached, waiting to try again");
tokio::time::sleep(Duration::from_millis(10000)).await;
b = worker_engine
.create_chunk(&id_c, c.iter().collect())
.await
.expect("failed to create chunk");
}
});
handles.push(handle);
descriptor.chunks.push(id.clone());
}
// wait for all handles to finish
println!("cnksv: waiting for all handles to finish");
loop {
let mut all_finished = true;
for handle in &handles {
if !handle.is_finished() {
all_finished = false;
break;
}
}
if all_finished {
break;
}
// sleep a little to save cpu
tokio::time::sleep(Duration::from_millis(150)).await;
}
// ...
descriptor.write(PathBufD::current().join(format!("{}.toml", descriptor.name)))?;
Ok(descriptor)
}
async fn reconstruct(&self, descriptor: FileDescriptor) -> Result<()> {
let mut encoded_string: String = String::new();
let chunks_num = descriptor.chunks.len();
for (i, chunk) in descriptor.chunks.iter().enumerate() {
tokio::time::sleep(Duration::from_millis(250)).await;
println!("cnkrd: start chunk read ({}/{chunks_num})", i + 1);
if let Ok(d) = self.get_chunk(&chunk).await {
println!("cnkrd: read {} bytes", d.len());
encoded_string += &d;
} else {
println!("cnkrd: waiting to retry chunk read");
tokio::time::sleep(Duration::from_millis(1000)).await;
encoded_string += &self.get_chunk(&chunk).await?;
}
}
let decoded = decrypt_deflate(descriptor.seed, descriptor.key, encoded_string);
write(PathBufD::current().join(descriptor.name), decoded)?;
Ok(())
}
async fn delete(&mut self, descriptor: FileDescriptor) -> Result<()> {
self.csrf_token = Some(
descriptor
.engine_data
.get("token")
.expect("rentry engine requires engine_data.token")
.to_owned(),
);
for (i, chunk) in descriptor.chunks.iter().enumerate() {
println!(
"cnkde: start chunk delete ({}/{})",
i + 1,
descriptor.chunks.len()
);
if self.delete_chunk(&chunk).await.is_err() {
// wait and then retry
println!("cnkde: waiting to retry chunk deletion");
tokio::time::sleep(Duration::from_millis(750)).await;
if self.delete_chunk(&chunk).await.is_err() {
println!("cnkde: failed to delete chunk {} (skipping)", i + 1);
continue;
};
}
}
Ok(())
}
async fn get_chunk(&self, id: &str) -> Result<String> {
println!("cnkrq: chunk request");
let res = self
.http
.get(format!("https://rentry.co/renbin_{id}"))
.send()
.await
.unwrap();
if res.status() != StatusCode::OK {
return Err(Error::other("remote error"));
}
let body = res.text().await.unwrap();
// this shows how useful that raw key thing is for you
let content = body
.split("<div><p>")
.skip(1)
.next()
.unwrap()
.split("</p></div>")
.next()
.unwrap()
.to_string();
println!("cnkrd: chunk read");
Ok(content)
}
async fn create_chunk(&self, id: &str, data: String) -> Result<String> {
let token = if let Some(ref token) = self.csrf_token {
token
} else {
return Err(Error::other("no csrf token extracted"));
};
// create body
let mut body_map: HashMap<&str, String> = HashMap::new();
body_map.insert("csrfmiddlewaretoken", token.to_owned());
body_map.insert("text", data);
body_map.insert("metadata", String::new());
body_map.insert("edit_code", token.to_owned());
body_map.insert("url", format!("renbin_{id}"));
// ...
let res = self
.http
.post("https://rentry.co")
.form(&body_map)
.header("Cookie", format!("csrftoken={token}"))
.header("Referer", "https://rentry.co/")
.send()
.await
.expect("failed to create chunk");
if res.status() != StatusCode::OK {
return Err(Error::other("remote error"));
}
println!("cnksv: chunk saved");
Ok(res.text().await.unwrap())
}
async fn delete_chunk(&self, id: &str) -> Result<()> {
let token = if let Some(ref token) = self.csrf_token {
token
} else {
return Err(Error::other("no csrf token extracted"));
};
// create body
let mut body_map: HashMap<&str, String> = HashMap::new();
body_map.insert("csrfmiddlewaretoken", token.to_owned());
body_map.insert("text", "renbin_delete".to_string());
body_map.insert("metadata", String::new());
body_map.insert("edit_code", token.to_owned());
body_map.insert("new_edit_code", String::new());
body_map.insert("new_url", String::new());
body_map.insert("new_modify_code", String::new());
body_map.insert("delete", "delete".to_string());
// the rentry api is one of the worst i've ever seen
let url = format!("https://rentry.co/renbin_{id}/edit");
let res = self
.http
.post(&url)
.form(&body_map)
.header("Cookie", format!("csrftoken={token}"))
.header("Referer", &url)
.send()
.await
.expect("failed to delete chunk");
if res.status() != StatusCode::OK {
return Err(Error::other("remote error"));
}
println!("cnkde: chunk deleted");
Ok(())
}
}

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pub mod engine;
use aes_gcm::{
Aes256Gcm, Nonce,
aead::{AeadCore, AeadInPlace, KeyInit, OsRng},
aes::cipher::typenum,
};
use base64::{Engine, engine::general_purpose::STANDARD};
use flate2::{Compression, read::GzDecoder, write::GzEncoder};
use pathbufd::PathBufD as PathBuf;
use rand::{Rng, distr::Alphanumeric, rng};
use serde::{Deserialize, Serialize};
use std::{
collections::HashMap,
fs::{read_to_string, write},
io::{Result, prelude::*},
};
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct FileDescriptor {
/// The name of the file.
pub name: String,
/// The encryption key used for the file.
pub key: String,
/// The seed (nonce) used for the file.
pub seed: String,
/// Data needed by the engine to read this file.
pub engine_data: HashMap<String, String>,
/// A list of all locations to retrieve chunks from.
/// Each chunk **must** be in the correct order.
pub chunks: Vec<String>,
}
impl FileDescriptor {
/// Read a [`FileDescriptor`] from the given `path`.
pub fn read(path: PathBuf) -> Self {
toml::from_str(&read_to_string(path).expect("failed to read file"))
.expect("failed to deserialize file")
}
/// Write a [`FileDescriptor`] into the given `path`.
pub fn write(&self, path: PathBuf) -> Result<()> {
write(
path,
toml::to_string_pretty(&self).expect("failed to serialize file"),
)
}
}
/// Create a random (not necessarily unique) 16-byte long string.
pub fn salt() -> String {
rng()
.sample_iter(&Alphanumeric)
.take(16)
.map(char::from)
.collect()
}
/// Encrypt and compress the given `data` using the given `key`.
///
/// # Returns
/// `(nonce, key, encrypted as base64)`
pub fn encrypt_compress(data: Vec<u8>) -> (String, String, String) {
// compress
let mut encoder = GzEncoder::new(Vec::new(), Compression::default());
encoder.write_all(&data).expect("failed to compress");
println!("encod: data compressed");
let mut compressed_buffer: Vec<u8> = encoder.finish().unwrap();
// encrypt
let key = Aes256Gcm::generate_key(&mut OsRng);
let cipher = Aes256Gcm::new(&key);
let nonce = Aes256Gcm::generate_nonce(&mut OsRng);
cipher
.encrypt_in_place(&nonce, b"", &mut compressed_buffer)
.expect("failed to encrypt");
println!("encod: data encrypted");
// return
(
STANDARD.encode(nonce.to_vec()),
STANDARD.encode(key.to_vec()),
STANDARD.encode(compressed_buffer.to_vec()),
)
}
/// Decrypt and uncompress the given `data` using the given `key`.
///
/// # Returns
/// `(key, encrypted)`
pub fn decrypt_deflate(nonce: String, key: String, data: String) -> Vec<u8> {
// decrypt
// decryption must happen first since we must undo what was done previously
let key = STANDARD.decode(key).expect("recieved invalid base64 key");
let cipher = Aes256Gcm::new_from_slice(&key.as_slice()).unwrap();
let nonce = Nonce::<typenum::U12>::clone_from_slice(
STANDARD
.decode(nonce)
.expect("received invalid base64 nonce")
.as_slice(),
);
let data = STANDARD.decode(data).expect("received invalid base64 data");
let mut decrypted_buffer: Vec<u8> = data;
cipher
.decrypt_in_place(&nonce, b"", &mut decrypted_buffer)
.expect("failed to decrypt");
println!("decod: data decrypted");
// compress
let mut decoder = GzDecoder::new(decrypted_buffer.as_slice());
let mut decompressed_buffer: Vec<u8> = Vec::new();
decoder
.read_to_end(&mut decompressed_buffer)
.expect("failed to decompress");
println!("decod: data decompressed");
// return
decompressed_buffer
}

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extern crate renbin;
use clap::Parser;
use renbin::{
FileDescriptor,
engine::{Engine, fs::FsEngine, rentry::RentryEngine},
};
use std::{
fs::{read, remove_file},
path::PathBuf,
};
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
#[arg(short = 'd', long = "decode", action)]
decode: bool,
#[arg(short = 'x', long = "delete", action)]
delete: bool,
#[arg(short = 'i', long = "input")]
path: String,
#[arg(short = 'e', long = "engine")]
#[clap(default_value = "fs")]
engine: String,
}
#[tokio::main]
async fn main() {
let args = Args::parse();
if args.delete {
// delete
let path = PathBuf::from(args.path);
if args.engine == "fs" {
FsEngine
.delete(FileDescriptor::read(path.clone().into()))
.await
.expect("failed to reconstruct file");
} else if args.engine == "rentry" {
let mut engine = RentryEngine::new();
engine.auth().await.expect("failed to extract csrf token");
engine
.delete(FileDescriptor::read(path.clone().into()))
.await
.expect("failed to delete file");
} else {
panic!("unknown engine type");
};
remove_file(path).expect("failed to delete file descriptor");
return;
}
if !args.decode {
// encode
let pathbuf = PathBuf::from(args.path);
if args.engine == "fs" {
FsEngine
.process(
pathbuf.file_name().unwrap().to_str().unwrap().to_string(),
read(pathbuf).expect("failed to read file"),
)
.await
.expect("failed to process file")
} else if args.engine == "rentry" {
let mut engine = RentryEngine::new();
engine.auth().await.expect("failed to extract csrf token");
engine
.process(
pathbuf.file_name().unwrap().to_str().unwrap().to_string(),
read(pathbuf).expect("failed to read file"),
)
.await
.expect("failed to process file")
} else {
panic!("unknown engine type");
};
} else {
// decode
if args.engine == "fs" {
FsEngine
.reconstruct(FileDescriptor::read(PathBuf::from(args.path).into()))
.await
.expect("failed to reconstruct file");
} else if args.engine == "rentry" {
let mut engine = RentryEngine::new();
engine.auth().await.expect("failed to extract csrf token");
engine
.reconstruct(FileDescriptor::read(PathBuf::from(args.path).into()))
.await
.expect("failed to reconstruct file");
} else {
panic!("unknown engine type");
};
}
}