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// -*- coding: utf-8 -*-
//
// disktest - Hard drive tester
//
// Copyright 2020 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 crypto::digest::Digest;
use crypto::hmac::Hmac;
use crypto::pbkdf2::pbkdf2;
use crypto::sha2::Sha512;
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 = Sha512::new();
salt_hash.input_str(&"disktest salt");
salt_hash.input(&key);
salt_hash.result(&mut salt);
salt
}
/// Key derivation function for the user supplied seed.
pub fn kdf(seed: &Vec<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());
// Use HMAC-SHA512 as PRF.
let mut mac = Hmac::new(Sha512::new(), &key);
// Calculated the DK (derived key).
let mut dk = [0; DK_SIZE];
pbkdf2(&mut mac, &derive_salt(&key), ITERATIONS, &mut dk);
dk.to_vec()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_salt() {
assert_eq!(derive_salt(&vec![1,2,3]).to_vec(),
derive_salt(&vec![1,2,3]).to_vec());
assert_ne!(derive_salt(&vec![1,2,3]).to_vec(),
derive_salt(&vec![1,2,4]).to_vec());
}
#[test]
fn test_kdf() {
assert_eq!(kdf(&vec![1,2,3], 42),
vec![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(&vec![1,2,4], 42),
vec![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(&vec![1,2,3], 43),
vec![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
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