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#![no_std]
#![cfg_attr(docsrs, feature(doc_cfg))]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/8f1a9894/logo.svg",
html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/8f1a9894/logo.svg"
)]
#[cfg(feature = "std")]
extern crate std;
#[cfg(feature = "simple")]
extern crate alloc;
#[cfg(feature = "simple")]
#[cfg_attr(docsrs, doc(cfg(feature = "simple")))]
pub use password_hash;
#[cfg(feature = "simple")]
mod simple;
#[cfg(feature = "simple")]
pub use crate::simple::{Algorithm, Params, Pbkdf2};
#[cfg(feature = "parallel")]
use rayon::prelude::*;
use digest::{generic_array::typenum::Unsigned, FixedOutput, KeyInit, Update};
#[inline(always)]
fn xor(res: &mut [u8], salt: &[u8]) {
debug_assert!(salt.len() >= res.len(), "length mismatch in xor");
res.iter_mut().zip(salt.iter()).for_each(|(a, b)| *a ^= b);
}
#[inline(always)]
fn pbkdf2_body<PRF>(i: u32, chunk: &mut [u8], prf: &PRF, salt: &[u8], rounds: u32)
where
PRF: KeyInit + Update + FixedOutput + Clone,
{
for v in chunk.iter_mut() {
*v = 0;
}
let mut salt = {
let mut prfc = prf.clone();
prfc.update(salt);
prfc.update(&(i + 1).to_be_bytes());
let salt = prfc.finalize_fixed();
xor(chunk, &salt);
salt
};
for _ in 1..rounds {
let mut prfc = prf.clone();
prfc.update(&salt);
salt = prfc.finalize_fixed();
xor(chunk, &salt);
}
}
#[cfg(not(feature = "parallel"))]
#[inline]
pub fn pbkdf2<PRF>(password: &[u8], salt: &[u8], rounds: u32, res: &mut [u8])
where
PRF: KeyInit + Update + FixedOutput + Clone + Sync,
{
let n = PRF::OutputSize::to_usize();
let prf = PRF::new_from_slice(password).expect("PRF initialization failure");
for (i, chunk) in res.chunks_mut(n).enumerate() {
pbkdf2_body(i as u32, chunk, &prf, salt, rounds);
}
}
#[cfg(feature = "parallel")]
#[inline]
pub fn pbkdf2<PRF>(password: &[u8], salt: &[u8], rounds: u32, res: &mut [u8])
where
PRF: KeyInit + Update + FixedOutput + Clone + Sync,
{
let n = PRF::OutputSize::to_usize();
let prf = PRF::new_from_slice(password).expect("PRF initialization failure");
res.par_chunks_mut(n).enumerate().for_each(|(i, chunk)| {
pbkdf2_body(i as u32, chunk, &prf, salt, rounds);
});
}