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// -*- coding: utf-8 -*-
//
// disktest - Hard drive tester
//
// Copyright 2020-2022 Michael Buesch <m@bues.ch>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
use ring::{digest, pbkdf2};
const ITERATIONS: u32 = 50000;
const DK_SIZE: usize = 256 / 8;
/// Generate a bad salt substitution from the key.
fn derive_salt(key: &[u8]) -> [u8; 512 / 8] {
// Generate the salt from the key.
// That's not a great salt, but good enough for our purposes.
let mut salt = [0; 512 / 8];
let mut salt_hash = digest::Context::new(&digest::SHA512);
salt_hash.update(b"disktest salt");
salt_hash.update(key);
salt.copy_from_slice(salt_hash.finish().as_ref());
salt
}
/// Key derivation function for the user supplied seed.
pub fn kdf(seed: &[u8], thread_id: u32) -> Vec<u8> {
// The key is: SEED | THREAD_ID
let mut key = seed.to_vec();
key.extend_from_slice(&thread_id.to_le_bytes());
// Calculated the DK (derived key).
let mut dk = vec![0; DK_SIZE];
pbkdf2::derive(
pbkdf2::PBKDF2_HMAC_SHA512,
ITERATIONS.try_into().unwrap(),
&derive_salt(&key),
&key,
&mut dk,
);
dk
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_salt() {
assert_eq!(
derive_salt(&[1, 2, 3]).to_vec(),
derive_salt(&[1, 2, 3]).to_vec()
);
assert_ne!(
derive_salt(&[1, 2, 3]).to_vec(),
derive_salt(&[1, 2, 4]).to_vec()
);
}
#[test]
fn test_kdf() {
assert_eq!(
kdf(&[1, 2, 3], 42),
[
126, 166, 175, 110, 112, 203, 204, 118, 71, 125, 227, 115, 65, 242, 193, 117, 229,
246, 164, 226, 239, 88, 119, 226, 21, 98, 166, 137, 232, 151, 243, 154
]
);
assert_eq!(
kdf(&[1, 2, 4], 42),
[
141, 91, 148, 215, 223, 193, 155, 52, 32, 216, 66, 86, 110, 114, 5, 10, 39, 253,
243, 146, 37, 243, 25, 238, 218, 100, 179, 204, 12, 150, 13, 102
]
);
assert_eq!(
kdf(&[1, 2, 3], 43),
[
8, 206, 134, 103, 131, 239, 126, 159, 222, 12, 74, 197, 28, 44, 237, 166, 152, 102,
63, 199, 93, 82, 199, 62, 97, 178, 240, 244, 24, 148, 242, 209
]
);
}
}
// vim: ts=4 sw=4 expandtab
|
