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use argon2::{Algorithm, Version};
use once_cell::sync::OnceCell;
pub(crate) static GLOBAL_CONFIG: OnceCell<tokio::sync::RwLock<Config>> = OnceCell::new();
/// Set the global config.
pub async fn set_config(config: Config<'static>) {
match GLOBAL_CONFIG.get() {
Some(cfg) => {
let mut cfg = cfg.write().await;
*cfg = config;
}
None => assert!(GLOBAL_CONFIG.set(tokio::sync::RwLock::new(config)).is_ok()),
}
}
/// Configuration for the `argon2` algorithm.
pub struct Config<'k> {
/// Set the hashing algorithm in use.
///
/// According to the [latest (as of 5/18) Argon2 RFC](https://tools.ietf.org/html/draft-irtf-cfrg-argon2-03) ...
/// "Argon2 has one primary variant: Argon2id, and two supplementary
/// variants: Argon2d and Argon2i. Argon2d uses data-dependent memory
/// access, which makes it suitable for ... applications with no threats from
/// side-channel timing attacks. Argon2i uses data-independent memory access,
/// which is preferred for password hashing and password-based key derivation.
/// Argon2id works as Argon2i for the first half of the first iteration over the memory,
/// and as Argon2d for the rest, thus providing both side-channel attack
pub algorithm: Algorithm,
/// Set the version of `argon2` to use.
pub version: Version,
/// The secret key to use.
///
/// This is **strongly** recommended in production.
pub secret_key: Option<&'k [u8]>,
/// The memory cost of the algorithm in kilobytes.
///
/// Argon2 has a notion of "memory size" or "memory cost" (in kilobytes). All else equal
/// and generally speaking, the greater the memory cost, the longer it takes to perform
/// the hash and the more secure the resulting hash. More memory cost basically means
/// more memory used. This and "iterations" are, generally speaking, the two parameters
/// to adjust in order to increase or decrease the security of your hash. If you're going
/// to use this crate in production, you should probably tweak this parameter (and the
/// iterations parameter) in order to increase the time it takes to hash to the maximum
/// you can reasonably allow for your use-case (e.g. to probably about 300-500 milliseconds
/// for the use-case of hashing user passwords for a website).
pub memory_cost: u32,
/// The number of iterations to use.
///
/// Argon2 has a notion of "iterations" or "time cost". All else equal and generally
/// speaking, the greater the number of iterations, the longer it takes to perform the
/// hash and the more secure the resulting hash. More iterations basically means more
/// CPU load. This and "memory cost" are the two primary parameters to adjust in order
/// to increase or decrease the security of your hash. If you're going to use this
/// crate in production, you should probably tweak this parameter (and the memory cost
/// parameter) in order to increase the time it takes to hash to the maximum you can
/// reasonably allow for your use-case (e.g. to probably about 300-500 milliseconds for
/// the use-case of hashing user passwords for a website).
pub iterations: u32,
/// The parallelism of the algorithm.
///
/// Argon2 can break up its work into one or more "lanes" during some parts of the
/// hashing algorithm. If you configure it with multiple lanes, the hashing algorithm
/// will perform its work in parallel in some parts, potentially speeding up the time
/// it takes to produce a hash without diminishing the security of the result.
pub parallelism: u32,
/// The output length of the algorithm in bytes.
pub output_length: Option<usize>,
}
impl<'k> Default for Config<'k> {
/// Create a new default config. This is good for basic purposes,
/// but **SHOULD NOT** be used in a production environment.
///
/// * Algorithm: Argon2id
/// * Version: 19 (0x13)
/// * Secret key: None,
/// * Memory size: 4,096 kilobytes
/// * Iterations: 3
/// * Parallelism: 1
/// * Output length: Some(32)
#[inline]
fn default() -> Self {
Self {
algorithm: Algorithm::Argon2id,
version: Version::V0x13,
secret_key: None,
memory_cost: 512,
iterations: 3,
parallelism: 1,
output_length: Some(32),
}
}
}
impl<'k> Config<'k> {
/// Create a new config. This is an insecure config and **should not be used in production**!
#[inline]
pub fn new_insecure() -> Self {
Self::default()
}
/// Create a new config. This config is somewhat more secure than `new_insecure()` but a secret key should still be set with the `set_secret_key()` function.
#[inline]
pub fn new() -> Self {
Self {
memory_cost: 8192,
iterations: 200,
parallelism: num_cpus::get_physical() as u32,
..Self::default()
}
}
}
impl<'k> Config<'k> {
/// Set the hashing algorithm in use.
///
/// The default (Argon2id) should be fine for most uses.
#[inline]
pub fn set_algorithm(&mut self, algorithm: Algorithm) -> &mut Self {
self.algorithm = algorithm;
self
}
/// Set the version of `argon2` to use.
///
/// The default (0x13 or v19) should be fine for most uses.
#[inline]
pub fn set_version(&mut self, version: Version) -> &mut Self {
self.version = version;
self
}
/// Set the secret key to use. This is **strongly** recommended in a production environment.
#[inline]
pub fn set_secret_key(&mut self, secret_key: Option<&'k [u8]>) -> &mut Self {
self.secret_key = secret_key;
self
}
/// Set the memory cost in kilobytes.
///
/// Default: 512 for insecure, and 4,096 for secure.
#[inline]
pub fn set_memory_cost(&mut self, memory_cost: u32) -> &mut Self {
self.memory_cost = memory_cost;
self
}
/// Set the number of iterations to use.
///
/// Default: 3 for insecure, and 200 for secure.
#[inline]
pub fn set_iterations(&mut self, iterations: u32) -> &mut Self {
self.iterations = iterations;
self
}
/// Set the parallelism of the algorithm.
///
/// Default: 1 for insecure, and the number of physical CPU cores on the host for secure.
#[inline]
pub fn set_parallelism(&mut self, parallelism: u32) -> &mut Self {
self.parallelism = parallelism;
self
}
/// Set the output length of the algorithm in bytes.
///
/// Default: 32
#[inline]
pub fn set_output_length(&mut self, output_length: Option<usize>) -> &mut Self {
self.output_length = output_length;
self
}
}