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|
// -*- coding: utf-8 -*-
//
// disktest - Storage tester
//
// Copyright 2020-2024 Michael Büsch <m@bues.ch>
//
// Licensed under the Apache License version 2.0
// or the MIT license, at your option.
// SPDX-License-Identifier: Apache-2.0 OR MIT
//
use crate::generator::NextRandom;
use crate::util::fold;
use anyhow as ah;
use rand::prelude::*;
macro_rules! GeneratorChaCha {
( $Generator:ident,
$ChaChaRng:ident,
$testmodule:ident,
$testresult0:literal,
$testresult1:literal,
$testresult2:literal,
$testresult3:literal
) => {
use rand_chacha::$ChaChaRng;
pub struct $Generator {
rng: $ChaChaRng,
}
impl $Generator {
/// Size of the algorithm base output data.
pub const BASE_SIZE: usize = 1024 * 2;
/// Default chunk size multiplicator.
pub const DEFAULT_CHUNK_FACTOR: usize = 1024 + 512;
pub fn new(seed: &[u8]) -> $Generator {
assert!(!seed.is_empty());
let folded_seed = fold(seed, 32).try_into().unwrap();
let rng = $ChaChaRng::from_seed(folded_seed);
$Generator { rng }
}
}
impl NextRandom for $Generator {
fn get_base_size(&self) -> usize {
$Generator::BASE_SIZE
}
fn next(&mut self, buf: &mut [u8], count: usize) {
debug_assert!(buf.len() == $Generator::BASE_SIZE * count);
self.rng.fill(buf);
}
fn seek(&mut self, byte_offset: u64) -> ah::Result<()> {
if byte_offset % $Generator::BASE_SIZE as u64 != 0 {
return Err(ah::format_err!(
"ChaCha seek: Byte offset is not a \
multiple of the base size ({} bytes).",
$Generator::BASE_SIZE
));
}
if byte_offset % 4 != 0 {
return Err(ah::format_err!(
"ChaCha seek: Byte offset is not a \
multiple of the word size (4 bytes)."
));
}
let word_offset = byte_offset / 4;
self.rng.set_word_pos(word_offset as u128);
Ok(())
}
}
#[cfg(test)]
mod $testmodule {
use super::*;
#[test]
fn test_cmp_result() {
let mut a = $Generator::new(&[1, 2, 3]);
fn reduce(acc: u32, (i, x): (usize, &u8)) -> u32 {
acc.rotate_left(i as u32) ^ (*x as u32)
}
let mut buf = vec![0u8; $Generator::BASE_SIZE * (1024 + 512)];
a.next(&mut buf, 1024 + 512);
assert_eq!(buf.iter().enumerate().fold(0, reduce), $testresult0);
let mut buf = vec![0u8; $Generator::BASE_SIZE * (1024 + 512)];
a.next(&mut buf, 1024 + 512);
assert_eq!(buf.iter().enumerate().fold(0, reduce), $testresult1);
let mut buf = vec![0u8; $Generator::BASE_SIZE * (1024 + 512) * 2];
a.next(&mut buf, (1024 + 512) * 2);
assert_eq!(buf.iter().enumerate().fold(0, reduce), $testresult2);
let mut buf = vec![0u8; $Generator::BASE_SIZE * (1024 + 512) * 3];
a.next(&mut buf, (1024 + 512) * 3);
assert_eq!(buf.iter().enumerate().fold(0, reduce), $testresult3);
}
#[test]
fn test_seed_equal() {
let mut a = $Generator::new(&[1, 2, 3]);
let mut b = $Generator::new(&[1, 2, 3]);
let mut res_a: Vec<Vec<u8>> = vec![];
let mut res_b: Vec<Vec<u8>> = vec![];
for _ in 0..2 {
let mut buf = vec![0u8; $Generator::BASE_SIZE];
a.next(&mut buf, 1);
res_a.push(buf);
let mut buf = vec![0u8; $Generator::BASE_SIZE];
b.next(&mut buf, 1);
res_b.push(buf);
}
assert_eq!(res_a[0], res_b[0]);
assert_eq!(res_a[1], res_b[1]);
assert_ne!(res_a[0], res_a[1]);
assert_ne!(res_b[0], res_b[1]);
}
#[test]
fn test_seed_diff() {
let mut a = $Generator::new(&[1, 2, 3]);
let mut b = $Generator::new(&[1, 2, 4]);
let mut res_a: Vec<Vec<u8>> = vec![];
let mut res_b: Vec<Vec<u8>> = vec![];
for _ in 0..2 {
let mut buf = vec![0u8; $Generator::BASE_SIZE];
a.next(&mut buf, 1);
res_a.push(buf);
let mut buf = vec![0u8; $Generator::BASE_SIZE];
b.next(&mut buf, 1);
res_b.push(buf);
}
assert_ne!(res_a[0], res_b[0]);
assert_ne!(res_a[1], res_b[1]);
assert_ne!(res_a[0], res_a[1]);
assert_ne!(res_b[0], res_b[1]);
}
#[test]
fn test_concat_equal() {
let mut a = $Generator::new(&[1, 2, 3]);
let mut b = $Generator::new(&[1, 2, 3]);
let mut buf_a = vec![0u8; $Generator::BASE_SIZE * 2];
a.next(&mut buf_a[0..$Generator::BASE_SIZE], 1);
a.next(
&mut buf_a[$Generator::BASE_SIZE..$Generator::BASE_SIZE * 2],
1,
);
let mut buf_b = vec![0u8; $Generator::BASE_SIZE * 2];
b.next(&mut buf_b, 2);
assert_eq!(buf_a, buf_b);
}
#[test]
fn test_seek() {
let mut a = $Generator::new(&[1, 2, 3]);
let mut b = $Generator::new(&[1, 2, 3]);
b.seek($Generator::BASE_SIZE as u64 * 2).unwrap();
let mut bdata = vec![0u8; $Generator::BASE_SIZE];
b.next(&mut bdata, 1);
let mut adata = vec![0u8; $Generator::BASE_SIZE];
a.next(&mut adata, 1);
assert_ne!(adata, bdata);
a.next(&mut adata, 1);
assert_ne!(adata, bdata);
a.next(&mut adata, 1);
assert_eq!(adata, bdata);
a.next(&mut adata, 1);
assert_ne!(adata, bdata);
}
}
};
}
GeneratorChaCha!(
GeneratorChaCha20,
ChaCha20Rng,
tests_chacha20,
331195744,
1401252284,
1567136089,
3153433807
);
GeneratorChaCha!(
GeneratorChaCha12,
ChaCha12Rng,
tests_chacha12,
477482776,
774733417,
473700519,
3620480628
);
GeneratorChaCha!(
GeneratorChaCha8,
ChaCha8Rng,
tests_chacha8,
3691419247,
1996469034,
1245532037,
1660157839
);
// vim: ts=4 sw=4 expandtab
|
