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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + 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 +. diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..ade1f81 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1,8 @@ +hard_tabs = true +newline_style = "unix" + +unstable_features = true +format_code_in_doc_comments = true +format_macro_bodies = true +format_macro_matchers = true +format_strings = true diff --git a/src/key.rs b/src/key.rs new file mode 100644 index 0000000..95840c4 --- /dev/null +++ b/src/key.rs @@ -0,0 +1,81 @@ +use chacha20poly1305::{aead::heapless::Vec, AeadInPlace, KeyInit}; +use zeroize::{Zeroize, ZeroizeOnDrop}; + +const KEY_SIZE: usize = 32; +const PBKDF_SALT_SIZE: usize = 32; +const CHACHA_SALT_SIZE: usize = 12; + +pub struct KeyDescription { + encrypted_key: [u8; KEY_SIZE], + pbkdf_salt: [u8; PBKDF_SALT_SIZE], + nonce: [u8; CHACHA_SALT_SIZE], + pbkdf_rounds: u32, +} + +#[derive(Zeroize, ZeroizeOnDrop)] +pub struct Key { + key: [u8; KEY_SIZE], +} + +impl KeyDescription { + /// Measure the number of rounds to match the target time (in milliseconds) + /// `now` should return a timestamp in milliseconds + pub fn measure_rounds u64>(target_time: u64, now: F) -> u32 { + let mut key = [0; KEY_SIZE]; + let mut memory = [0; KEY_SIZE]; + let salt = core::hint::black_box([0; PBKDF_SALT_SIZE]); + let passphrase = core::hint::black_box([0]); + + let start_1 = (now)(); + bcrypt_pbkdf::bcrypt_pbkdf_with_memory(passphrase, &salt, 1, &mut key, &mut memory) + .unwrap(); + let end_1 = (now)(); + let duration_1 = end_1 - start_1; + + key = [0; KEY_SIZE]; + memory = [0; KEY_SIZE]; + + let start_2 = (now)(); + bcrypt_pbkdf::bcrypt_pbkdf_with_memory(passphrase, &salt, 17, &mut key, &mut memory) + .unwrap(); + let end_2 = (now)(); + let duration_2 = end_2 - start_2; + + assert!(duration_2 > duration_1); + + (target_time * 16 / (duration_2 - duration_1)) as u32 + } + + pub fn get_key(&self, passphrase: &mut [u8]) -> Result { + let mut derived_key = [0; KEY_SIZE]; + + let mut memory = [0; KEY_SIZE]; + bcrypt_pbkdf::bcrypt_pbkdf_with_memory( + &*passphrase, + &self.pbkdf_salt, + self.pbkdf_rounds, + &mut derived_key, + &mut memory, + ) + .map_err(Error::Pbkdf)?; + + passphrase.zeroize(); + + let mut key = Vec::::from_slice(&self.encrypted_key) + .map_err(|_| Error::WrongKeySize)?; + let cipher = chacha20poly1305::ChaCha20Poly1305::new(&derived_key.into()); + cipher + .decrypt_in_place(&self.nonce.into(), &[], &mut key) + .map_err(Error::Chacha)?; + + Ok(Key { + key: key.into_array().map_err(|_| Error::WrongKeySize)?, + }) + } +} + +pub enum Error { + Chacha(chacha20poly1305::Error), + Pbkdf(bcrypt_pbkdf::Error), + WrongKeySize, +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..aa4bdca --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,8 @@ +#![cfg_attr(not(test), no_std)] + +mod key; + +pub use key::*; + +#[cfg(test)] +mod tests; diff --git a/src/tests.rs b/src/tests.rs new file mode 100644 index 0000000..2b5dcb8 --- /dev/null +++ b/src/tests.rs @@ -0,0 +1,13 @@ +use crate::*; + +#[test] +fn test_measure_rounds() { + let rounds = KeyDescription::measure_rounds(500, || { + std::time::SystemTime::now() + .duration_since(std::time::UNIX_EPOCH) + .unwrap() + .as_millis() as u64 + }); + + println!("{rounds}"); +}