Dexios-Core is a library used for managing cryptographic functions and headers that adhere to the Dexios format.

What is it?

Dexios-Core is a library used for managing cryptographic functions and headers that adhere to the Dexios format.

Security

Dexios-Core uses modern, secure and audited¹ AEADs for encryption and decryption.

You may find the audits for both AES-256-GCM and XChaCha20-Poly1305 on the NCC Group's website.

¹ Deoxys-II-256 does not have an official audit, so use it at your own risk

Who uses Dexios-Core?

This library is implemented by Dexios, a secure command-line file encryption utility.

Dexios-Core makes it easy to integrate the Dexios format into your own projects (and if there's a feature that you'd like to see, please don't hesitate to open a Github issue). The documentation is packed with information to help you get started!

Features

• Convenience functions for encrypting/decrypting
• 3 AEADs (XChaCha20-Poly1305, AES-256-GCM, Deoxys-II-256)
• Easy management of encrypted headers (no more worrying about where to store a nonce!)
• Fast argon2id hashing with secure parameters
• Frequent updates and feature additions!

Donating

If you like my work, and want to help support Dexios, or Dexios-Core, feel free to donate! This is not necessary by any means, so please don't feel obliged to do so.

XMR: 84zSGS18aHtT3CZjZUnnWpCsz1wmA5f65G6BXisbrvAiH7PxZpP8GorbdjAQYRtfeiANZywwUPjZcHu8eXJeWdafJQFK46G
BTC: bc1q8x0r7khrfj40qd0zr5xv3t9nl92rz2387pu48u
ETH: 0x9630f95F11dFa8703b71DbF746E5c83A31A3F2DD

Examples

Deserializing a header:

let header_bytes: [u8; 64] = [
  222, 2, 14, 1, 12, 1, 142, 88, 243, 144, 119, 187, 189, 190, 121, 90, 211, 56, 185, 14, 76,
  45, 16, 5, 237, 72, 7, 203, 13, 145, 13, 155, 210, 29, 128, 142, 241, 233, 42, 168, 243,
  129, 0, 0, 0, 0, 0, 0, 214, 45, 3, 4, 11, 212, 129, 123, 192, 157, 185, 109, 151, 225, 233,
  161,
];

let mut cursor = Cursor::new(header_bytes);

// the cursor may be a file, this is just an example

let (header, aad) = Header::deserialize(&mut cursor).unwrap();

Writing a header to a file:

let mut output_file = File::create("test").unwrap();
header.write(&mut output_file).unwrap();

Encrypting and decrypting in-memory:

// obviously the key should contain data, not be an empty vec
let raw_key = Protected::new(vec![0u8; 128]);
let salt = gen_salt();
let key = argon2id_hash(raw_key, &salt, &HeaderVersion::V3).unwrap();
let cipher = Ciphers::initialize(key, &Algorithm::XChaCha20Poly1305).unwrap();

let secret = "super secret information";

let nonce = gen_nonce(&Algorithm::XChaCha20Poly1305, &Mode::MemoryMode);
let encrypted_data = cipher.encrypt(&nonce, secret.as_bytes()).unwrap();

let decrypted_data = cipher.decrypt(&nonce, encrypted_data.as_slice()).unwrap();

assert_eq!(secret, decrypted_data);

You can read more about Dexios, Dexios-Core and the technical details in the project's main documentation!

Thank you!

Dexios-Core exclusively uses AEADs provided by the RustCrypto Team, so I'd like to give them a huge thank you for their hard work (this wouldn't have been possible without them!)