commit 032432f775a0584d3b3921b728851f054bb64434
Author: Spectre <elouan.fare@protonmail.ch>
Date:   Thu Sep 25 19:28:39 2025 +0200

    Started project

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0a31003
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "oxylos"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1"
+thiserror = "1"
+chrono = { version = "0.4", features = ["clock"] }
+clap = { version = "4", features = ["derive"] }
+colored = "2"
+openssl = { version = "0.10", features = ["vendored"] }
+uuid = { version = "1", features = ["v4"] }
+filetime = "0.2.26"
+
+[dev-dependencies]
+tempfile = "3"
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..b073a73
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,33 @@
+use clap::Parser;
+use std::path::PathBuf;
+
+use crate::config::{DEFAULT_PRIVKEY, DEFAULT_PUBKEY};
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about=None)]
+pub struct Args {
+    #[arg(short = 'e', long = "encrypt", conflicts_with_all = ["decrypt", "inbox"])]
+    pub encrypt: bool,
+
+    #[arg(short = 'd', long = "decrypt", conflicts_with_all = ["encrypt", "inbox"])]
+    pub decrypt: bool,
+
+    #[arg(long = "inbox", conflicts_with_all = ["encrypt", "decrypt"])]
+    pub inbox: bool,
+
+    #[arg(short = 'p', long = "path")]
+    pub path: Option<PathBuf>,
+
+    #[arg(short = 'g', long = "generate-new-keys", conflicts_with_all = ["encrypt", "decrypt", "inbox"])]
+    pub generate_new_keys: bool,
+
+    #[arg(long = "public-key", default_value = DEFAULT_PUBKEY)]
+    pub public_key: PathBuf,
+
+    #[arg(long = "private-key", default_value = DEFAULT_PRIVKEY)]
+    pub private_key: PathBuf,
+
+    #[arg(long = "passphrase")]
+    pub passphrase: Option<String>,
+}
+
diff --git a/src/commands/decrypt.rs b/src/commands/decrypt.rs
new file mode 100644
index 0000000..87fb61d
--- /dev/null
+++ b/src/commands/decrypt.rs
@@ -0,0 +1,19 @@
+use anyhow::{bail, Context, Result};
+use std::io::{self, Write};
+
+use crate::cli::Args;
+use crate::crypto::rsa::decrypt_with_priv;
+
+pub fn run(args: &Args) -> Result<()> {
+    let private_pem = std::fs::read_to_string(&args.private_key).context("read private key failed")?;
+    let pass = args.passphrase.as_ref().map(|s| s.as_bytes());
+    let in_path = match args.path.as_ref() {
+        Some(p) => p,
+        None => bail!("--path is required for --decrypt"),
+    };
+    let ciphertext = std::fs::read(in_path).context("read ciphertext failed")?;
+    let plain = decrypt_with_priv(&ciphertext, &private_pem, pass)?;
+    io::stdout().write_all(&plain)?;
+    Ok(())
+}
+
diff --git a/src/commands/encrypt.rs b/src/commands/encrypt.rs
new file mode 100644
index 0000000..1e98789
--- /dev/null
+++ b/src/commands/encrypt.rs
@@ -0,0 +1,33 @@
+use anyhow::{Context, Result};
+use chrono::Utc;
+use std::io;
+use std::path::Path;
+use uuid::Uuid;
+
+use crate::cli::Args;
+use crate::config::DEFAULT_OUT_MSG;
+use crate::crypto::rsa::encrypt_with_pub;
+use crate::storage::fsio::write_all;
+
+pub fn run(args: &Args) -> Result<()> {
+    let _t = Utc::now();
+    let uuid = Uuid::new_v4();
+    let out = format!("{DEFAULT_OUT_MSG}{uuid}");
+    let out_path = args.path.as_deref().unwrap_or(Path::new(&out));
+
+    let mut author = String::new();
+    println!("enter your name/pseudonyme below:");
+    io::stdin().read_line(&mut author).context("stdin author")?;
+
+    let mut content = String::new();
+    println!("enter your text below:");
+    io::stdin()
+        .read_line(&mut content)
+        .context("stdin content")?;
+
+    let pk_pem = std::fs::read_to_string(&args.public_key).context("read public key failed")?;
+    let payload = format!("Author: {author}\n{content}");
+    let cipher_text = encrypt_with_pub(payload.trim_end().as_bytes(), &pk_pem)?;
+    write_all(out_path, &cipher_text)?;
+    Ok(())
+}
diff --git a/src/commands/inbox.rs b/src/commands/inbox.rs
new file mode 100644
index 0000000..d201dae
--- /dev/null
+++ b/src/commands/inbox.rs
@@ -0,0 +1,18 @@
+use anyhow::{Context, Result};
+use std::io::{self, Write};
+
+use crate::cli::Args;
+use crate::message::scan::get_intended_messages_with_pass;
+
+pub fn run(args: &Args) -> Result<()> {
+    let private_pem = std::fs::read_to_string(&args.private_key).context("read private key failed")?;
+    let pass = args.passphrase.as_deref().map(str::as_bytes);
+    let items = get_intended_messages_with_pass(&private_pem, pass)?;
+    for (path, plain) in items {
+        println!("{}\n---", path.display());
+        io::stdout().write_all(&plain)?;
+        println!();
+    }
+    Ok(())
+}
+
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
new file mode 100644
index 0000000..65f8758
--- /dev/null
+++ b/src/commands/mod.rs
@@ -0,0 +1,28 @@
+use anyhow::Result;
+
+use crate::cli::Args;
+
+pub mod decrypt;
+pub mod encrypt;
+pub mod inbox;
+
+pub fn dispatch(args: Args) -> Result<()> {
+    if args.generate_new_keys {
+        crate::crypto::rsa::generate_keys(
+            crate::config::DEFAULT_PRIVKEY,
+            crate::config::DEFAULT_PUBKEY,
+        )?;
+        return Ok(());
+    }
+    if args.encrypt {
+        return encrypt::run(&args);
+    }
+    if args.decrypt {
+        return decrypt::run(&args);
+    }
+    if args.inbox {
+        return inbox::run(&args);
+    }
+    let _ = crate::message::scan::search_messages()?;
+    Ok(())
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..e8d1d59
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,4 @@
+pub const DEFAULT_PUBKEY: &str = "storage/keys/public.pem";
+pub const DEFAULT_PRIVKEY: &str = "storage/keys/private.pem";
+pub const DEFAULT_OUT_MSG: &str = "storage/messages/";
+
diff --git a/src/crypto/mod.rs b/src/crypto/mod.rs
new file mode 100644
index 0000000..8184486
--- /dev/null
+++ b/src/crypto/mod.rs
@@ -0,0 +1,2 @@
+pub mod rsa;
+
diff --git a/src/crypto/rsa.rs b/src/crypto/rsa.rs
new file mode 100644
index 0000000..56090ed
--- /dev/null
+++ b/src/crypto/rsa.rs
@@ -0,0 +1,111 @@
+use openssl::encrypt::{Decrypter, Encrypter};
+use openssl::error::ErrorStack;
+use openssl::hash::MessageDigest;
+use openssl::pkey::{PKey, Private};
+use openssl::rsa::{Padding, Rsa};
+
+use crate::errors::CryptoError;
+use crate::storage::fsio::write_all;
+use std::path::Path;
+
+fn map_err(ctx: &str, e: ErrorStack) -> CryptoError {
+    CryptoError::OpenSsl(format!("{ctx}: {e}"))
+}
+
+pub fn load_public_key(pem: &str) -> Result<PKey<openssl::pkey::Public>, CryptoError> {
+    if pem.contains("BEGIN RSA PUBLIC KEY") {
+        let rsa =
+            Rsa::public_key_from_pem_pkcs1(pem.as_bytes()).map_err(|e| map_err("pkcs1", e))?;
+        PKey::from_rsa(rsa).map_err(|e| map_err("pkey from rsa", e))
+    } else {
+        PKey::public_key_from_pem(pem.as_bytes()).map_err(|e| map_err("public_key_from_pem", e))
+    }
+}
+
+pub fn load_private_key(pem: &str, pass: Option<&[u8]>) -> Result<PKey<Private>, CryptoError> {
+    if let Some(p) = pass {
+        PKey::private_key_from_pem_passphrase(pem.as_bytes(), p)
+            .map_err(|e| map_err("private+pass", e))
+    } else {
+        PKey::private_key_from_pem(pem.as_bytes()).map_err(|e| map_err("private", e))
+    }
+}
+
+pub fn encrypt_with_pub(plain: &[u8], pub_pem: &str) -> Result<Vec<u8>, CryptoError> {
+    let pkey = load_public_key(pub_pem)?;
+    let mut enc = Encrypter::new(&pkey).map_err(|e| map_err("enc new", e))?;
+    enc.set_rsa_padding(Padding::PKCS1_OAEP)
+        .map_err(|e| map_err("set padding", e))?;
+    enc.set_rsa_oaep_md(MessageDigest::sha256())
+        .map_err(|e| map_err("oaep md", e))?;
+    enc.set_rsa_mgf1_md(MessageDigest::sha256())
+        .map_err(|e| map_err("mgf1 md", e))?;
+    let mut out = vec![
+        0;
+        enc.encrypt_len(plain)
+            .map_err(|e| map_err("encrypt_len", e))?
+    ];
+    let n = enc
+        .encrypt(plain, &mut out)
+        .map_err(|e| map_err("encrypt", e))?;
+    out.truncate(n);
+    Ok(out)
+}
+
+pub fn decrypt_with_priv(
+    cipher: &[u8],
+    priv_pem: &str,
+    pass: Option<&[u8]>,
+) -> Result<Vec<u8>, CryptoError> {
+    let pkey = load_private_key(priv_pem, pass)?;
+    let mut dec = Decrypter::new(&pkey).map_err(|e| map_err("dec new", e))?;
+    dec.set_rsa_padding(Padding::PKCS1_OAEP)
+        .map_err(|e| map_err("set padding", e))?;
+    dec.set_rsa_oaep_md(MessageDigest::sha256())
+        .map_err(|e| map_err("oaep md", e))?;
+    dec.set_rsa_mgf1_md(MessageDigest::sha256())
+        .map_err(|e| map_err("mgf1 md", e))?;
+    let mut out = vec![
+        0;
+        dec.decrypt_len(cipher)
+            .map_err(|e| map_err("decrypt_len", e))?
+    ];
+    let n = dec
+        .decrypt(cipher, &mut out)
+        .map_err(|e| map_err("decrypt", e))?;
+    out.truncate(n);
+    Ok(out)
+}
+
+pub fn generate_keys(priv_out: &str, pub_out: &str) -> Result<(), CryptoError> {
+    let rsa = Rsa::generate(3072).map_err(|e| map_err("rsa gen", e))?;
+    let pkey = PKey::from_rsa(rsa).map_err(|e| map_err("to pkey", e))?;
+    let sk_pem = pkey
+        .private_key_to_pem_pkcs8()
+        .map_err(|e| map_err("pem pkcs8", e))?;
+    let pk_pem = pkey
+        .public_key_to_pem()
+        .map_err(|e| map_err("pub pem", e))?;
+    write_all(Path::new(priv_out), &sk_pem)
+        .map_err(|e| CryptoError::OpenSsl(format!("write priv: {e}")))?;
+    write_all(Path::new(pub_out), &pk_pem)
+        .map_err(|e| CryptoError::OpenSsl(format!("write pub: {e}")))?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn roundtrip_encrypt_decrypt_pkcs8() {
+        let rsa = Rsa::generate(2048).unwrap();
+        let pkey = PKey::from_rsa(rsa).unwrap();
+        let pk_pem = String::from_utf8(pkey.public_key_to_pem().unwrap()).unwrap();
+        let sk_pem = String::from_utf8(pkey.private_key_to_pem_pkcs8().unwrap()).unwrap();
+        let msg = b"hello, cryptoworld";
+        let cipher = encrypt_with_pub(msg, &pk_pem).unwrap();
+        let plain = decrypt_with_priv(&cipher, &sk_pem, None).unwrap();
+        assert_eq!(msg, &plain[..]);
+    }
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..9f4128f
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,8 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum CryptoError {
+    #[error("{0}")]
+    OpenSsl(String),
+}
+
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..2594714
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,8 @@
+pub mod cli;
+pub mod config;
+pub mod errors;
+pub mod commands;
+pub mod crypto;
+pub mod storage;
+pub mod message;
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..a62644f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,10 @@
+use anyhow::Result;
+use clap::Parser;
+
+fn main() -> Result<()> {
+    let args = oxylos::cli::Args::parse();
+    oxylos::storage::init::ensure_storage_or_init()?;
+    oxylos::storage::init::ensure_os_dropboxes()?;
+    let _ = oxylos::message::sync::auto_sync()?;
+    oxylos::commands::dispatch(args)
+}
diff --git a/src/message/hash.rs b/src/message/hash.rs
new file mode 100644
index 0000000..f5938ff
--- /dev/null
+++ b/src/message/hash.rs
@@ -0,0 +1,20 @@
+use openssl::sha::Sha256;
+use std::fs::File;
+use std::io::{self, Read};
+use std::path::Path;
+
+pub fn sha256_file(path: &Path) -> io::Result<[u8; 32]> {
+    let file = File::open(path)?;
+    let mut reader = std::io::BufReader::new(file);
+    let mut hasher = Sha256::new();
+    let mut buf = [0u8; 4096];
+    loop {
+        let n = reader.read(&mut buf)?;
+        if n == 0 {
+            break;
+        }
+        hasher.update(&buf[..n]);
+    }
+    Ok(hasher.finish())
+}
+
diff --git a/src/message/mod.rs b/src/message/mod.rs
new file mode 100644
index 0000000..17b44fa
--- /dev/null
+++ b/src/message/mod.rs
@@ -0,0 +1,4 @@
+pub mod scan;
+pub mod sync;
+pub mod hash;
+
diff --git a/src/message/scan.rs b/src/message/scan.rs
new file mode 100644
index 0000000..2fd9b0a
--- /dev/null
+++ b/src/message/scan.rs
@@ -0,0 +1,112 @@
+use std::fs::read_dir;
+use std::fs::DirEntry;
+use std::io;
+use std::path::PathBuf;
+
+use crate::crypto::rsa::decrypt_with_priv;
+use crate::storage::fsio::is_valid_dir;
+use crate::storage::paths::{persistent_dir, ram_dir};
+
+pub fn search_messages() -> io::Result<Vec<DirEntry>> {
+    search_messages_in(persistent_dir(), ram_dir())
+}
+
+pub fn search_messages_in(persistent: &str, ram: &str) -> io::Result<Vec<DirEntry>> {
+    if !is_valid_dir(persistent) {
+        eprintln!("Couldn't find persistent folder at {persistent}");
+        return Ok(Vec::new());
+    }
+    if !is_valid_dir(ram) {
+        eprintln!("Couldn't find RAM folder at {ram}");
+        return Ok(Vec::new());
+    }
+    let ram_paths = read_dir(ram)?;
+    let persistent_paths = read_dir(persistent)?;
+    let mut all = Vec::new();
+    all.extend(ram_paths.filter_map(Result::ok));
+    all.extend(persistent_paths.filter_map(Result::ok));
+    Ok(all)
+}
+
+pub fn get_intended_messages(private_pem: &str) -> io::Result<Vec<(PathBuf, Vec<u8>)>> {
+    get_intended_messages_with_pass(private_pem, None)
+}
+
+pub fn get_intended_messages_with_pass(
+    private_pem: &str,
+    pass: Option<&[u8]>,
+) -> io::Result<Vec<(PathBuf, Vec<u8>)>> {
+    get_intended_messages_in_with_pass(private_pem, pass, persistent_dir(), ram_dir())
+}
+
+pub fn get_intended_messages_in_with_pass(
+    private_pem: &str,
+    pass: Option<&[u8]>,
+    persistent: &str,
+    ram: &str,
+) -> io::Result<Vec<(PathBuf, Vec<u8>)>> {
+    let entries = search_messages_in(persistent, ram)?;
+    let mut found = Vec::new();
+    for entry in entries {
+        let p = entry.path();
+        if !p.is_file() {
+            continue;
+        }
+        if let Ok(cipher) = std::fs::read(&p) {
+            if let Ok(plain) = decrypt_with_priv(&cipher, private_pem, pass) {
+                found.push((p, plain));
+            }
+        }
+    }
+    Ok(found)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::crypto::rsa::encrypt_with_pub;
+    use openssl::pkey::PKey;
+    use openssl::rsa::Rsa;
+    use tempfile::tempdir;
+
+    #[test]
+    fn search_messages_missing_dirs_yields_empty_ok() -> io::Result<()> {
+        let list = search_messages_in("/this/does/not/exist", "/neither/does/this")?;
+        assert!(list.is_empty());
+        Ok(())
+    }
+
+    #[test]
+    fn get_intended_messages_returns_only_decryptable() -> io::Result<()> {
+        let rsa = Rsa::generate(2048).unwrap();
+        let pkey = PKey::from_rsa(rsa).unwrap();
+        let pk_pem = String::from_utf8(pkey.public_key_to_pem().unwrap()).unwrap();
+        let sk_pem = String::from_utf8(pkey.private_key_to_pem_pkcs8().unwrap()).unwrap();
+        let d_persistent = tempdir()?;
+        let d_ram = tempdir()?;
+        let msg1 = b"alpha";
+        let msg2 = b"bravo";
+        let c1 = encrypt_with_pub(msg1, &pk_pem).unwrap();
+        let c2 = encrypt_with_pub(msg2, &pk_pem).unwrap();
+        let p1 = d_persistent.path().join("m1.msg");
+        let p2 = d_ram.path().join("m2.msg");
+        std::fs::write(&p1, &c1)?;
+        std::fs::write(&p2, &c2)?;
+        let p_bad = d_persistent.path().join("noise.bin");
+        std::fs::write(&p_bad, b"\x01\x02\x03\x04\x05")?;
+        let list = get_intended_messages_in_with_pass(
+            &sk_pem,
+            None,
+            d_persistent.path().to_str().unwrap(),
+            d_ram.path().to_str().unwrap(),
+        )?;
+        assert_eq!(list.len(), 2);
+        let plains: Vec<String> = list
+            .iter()
+            .map(|(_, v)| String::from_utf8_lossy(v).to_string())
+            .collect();
+        assert!(plains.contains(&"alpha".to_string()));
+        assert!(plains.contains(&"bravo".to_string()));
+        Ok(())
+    }
+}
diff --git a/src/message/sync.rs b/src/message/sync.rs
new file mode 100644
index 0000000..f43338e
--- /dev/null
+++ b/src/message/sync.rs
@@ -0,0 +1,72 @@
+use std::collections::HashMap;
+use std::io;
+use std::path::PathBuf;
+
+use crate::message::hash::sha256_file;
+use crate::storage::fsio::{copy_msg, list_files};
+
+pub struct SyncReport {
+    pub copied_to_remote: usize,
+    pub copied_to_local: usize,
+}
+
+pub fn bidirectional_sync(
+    local_outbox: &[PathBuf],
+    remote_dirs: &[Vec<PathBuf>],
+    local_dest: &str,
+    remote_dest: &str,
+) -> io::Result<SyncReport> {
+    let mut own_map = HashMap::new();
+    for f in local_outbox {
+        let digest = sha256_file(f)?;
+        own_map.insert(digest, f);
+    }
+    let mut remote_map = HashMap::new();
+    for group in remote_dirs {
+        for f in group {
+            let digest = sha256_file(f)?;
+            remote_map.insert(digest, f);
+        }
+    }
+
+    let commons: Vec<[u8; 32]> = own_map
+        .keys()
+        .filter(|k| remote_map.contains_key(*k))
+        .copied()
+        .collect();
+    for k in commons {
+        own_map.remove(&k);
+        remote_map.remove(&k);
+    }
+
+    let mut copied_to_remote = 0usize;
+    for msg in own_map.values() {
+        let name = uuid::Uuid::new_v4().to_string();
+        copy_msg(msg.to_str().unwrap(), &format!("{remote_dest}{name}"))?;
+        copied_to_remote += 1;
+    }
+
+    let mut copied_to_local = 0usize;
+    for msg in remote_map.values() {
+        let name = uuid::Uuid::new_v4().to_string();
+        copy_msg(msg.to_str().unwrap(), &format!("{local_dest}{name}"))?;
+        copied_to_local += 1;
+    }
+
+    Ok(SyncReport {
+        copied_to_remote,
+        copied_to_local,
+    })
+}
+
+pub fn auto_sync() -> io::Result<SyncReport> {
+    let local = list_files(crate::config::DEFAULT_OUT_MSG)?;
+    let remote_p = list_files(crate::storage::paths::persistent_dir())?;
+    let remote_r = list_files(crate::storage::paths::ram_dir())?;
+    bidirectional_sync(
+        &local,
+        &[remote_p, remote_r],
+        crate::config::DEFAULT_OUT_MSG,
+        crate::storage::paths::persistent_dir(),
+    )
+}
diff --git a/src/storage/fsio.rs b/src/storage/fsio.rs
new file mode 100644
index 0000000..8a02969
--- /dev/null
+++ b/src/storage/fsio.rs
@@ -0,0 +1,47 @@
+use filetime::{set_file_times, FileTime};
+use std::fs::{self, File, OpenOptions};
+use std::io::{self, Read, Write};
+use std::os::unix::fs::PermissionsExt;
+use std::path::{Path, PathBuf};
+
+fn neutralize_metadata(path: &Path) -> io::Result<()> {
+    let perms = fs::Permissions::from_mode(0o600);
+    let _ = fs::set_permissions(path, perms);
+    let zero = FileTime::from_unix_time(0, 0);
+    let _ = set_file_times(path, zero, zero);
+    Ok(())
+}
+
+pub fn write_all(path: &Path, content: &[u8]) -> io::Result<()> {
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+    let mut f = OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open(path)?;
+    let _ = fs::set_permissions(path, fs::Permissions::from_mode(0o600));
+    f.write_all(content)?;
+    f.sync_all()?;
+    neutralize_metadata(path)
+}
+
+pub fn list_files(directory_path: &str) -> io::Result<Vec<PathBuf>> {
+    let mut paths = Vec::new();
+    for entry in fs::read_dir(directory_path)? {
+        let entry = entry?;
+        paths.push(entry.path());
+    }
+    Ok(paths)
+}
+
+pub fn is_valid_dir(path: &str) -> bool {
+    Path::new(path).is_dir()
+}
+
+pub fn copy_msg(source: &str, destination: &str) -> io::Result<()> {
+    let mut buf = Vec::new();
+    File::open(source)?.read_to_end(&mut buf)?;
+    write_all(Path::new(destination), &buf)
+}
diff --git a/src/storage/init.rs b/src/storage/init.rs
new file mode 100644
index 0000000..8b97fac
--- /dev/null
+++ b/src/storage/init.rs
@@ -0,0 +1,38 @@
+use colored::Colorize;
+use std::io;
+use std::path::Path;
+
+pub fn ensure_storage_or_init() -> io::Result<()> {
+    let path = Path::new("storage");
+    if !path.exists() {
+        init()?;
+        std::process::exit(0);
+    }
+    Ok(())
+}
+
+fn create_persistent_storage() -> io::Result<()> {
+    std::fs::create_dir_all("storage")?;
+    std::fs::create_dir_all("storage/keys")?;
+    std::fs::create_dir_all("storage/index")?;
+    std::fs::create_dir_all("storage/messages")?;
+    Ok(())
+}
+
+pub fn init() -> io::Result<()> {
+    let color_text = "Olyxos -h";
+    println!(
+        "Thank you for using Olyxos. This is the initialization of the program; it creates 4 directories. The first one is storage: this is where the program stores everything. If you already have a pair of cryptographic keys and you want to use them, please put them in storage/keys/ under the names 'private.pem' and 'public.pem'. You can see the arguments to use by running {}",
+        color_text.red()
+    );
+    create_persistent_storage()
+}
+
+pub fn ensure_os_dropboxes() -> io::Result<()> {
+    use std::fs::create_dir_all;
+    let p = crate::storage::paths::persistent_dir();
+    let r = crate::storage::paths::ram_dir();
+    let _ = create_dir_all(p);
+    let _ = create_dir_all(r);
+    Ok(())
+}
diff --git a/src/storage/mod.rs b/src/storage/mod.rs
new file mode 100644
index 0000000..1f84131
--- /dev/null
+++ b/src/storage/mod.rs
@@ -0,0 +1,4 @@
+pub mod init;
+pub mod paths;
+pub mod fsio;
+
diff --git a/src/storage/paths.rs b/src/storage/paths.rs
new file mode 100644
index 0000000..99670b9
--- /dev/null
+++ b/src/storage/paths.rs
@@ -0,0 +1,29 @@
+#[cfg(target_os = "windows")]
+pub fn persistent_dir() -> &'static str {
+    r"C:\ProgramData\Oxylos\"
+}
+
+#[cfg(target_os = "windows")]
+pub fn ram_dir() -> &'static str {
+    r"Global\Oxylos"
+}
+
+#[cfg(all(unix, not(target_os = "macos")))]
+pub fn persistent_dir() -> &'static str {
+    "/tmp/Oxylos/"
+}
+
+#[cfg(all(unix, not(target_os = "macos")))]
+pub fn ram_dir() -> &'static str {
+    "/dev/shm/Oxylos/"
+}
+
+#[cfg(target_os = "macos")]
+pub fn persistent_dir() -> &'static str {
+    "/tmp/Oxylos/"
+}
+
+#[cfg(target_os = "macos")]
+pub fn ram_dir() -> &'static str {
+    "/tmp/Oxylos.shm/"
+}