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Drop
ahash dependency in favor of core's SipHasher
tkaitchuck/aHash#196 bumped the MSRV of `ahash` in a patch release, which makes it rather difficult for us to have it as a dependency. Further, it seems that `ahash` hasn't been particularly robust in the past, notably tkaitchuck/aHash#163 and tkaitchuck/aHash#166. Luckily, `core` provides `SipHasher` even on no-std (sadly its SipHash-2-4 unlike the SipHash-1-3 used by the `DefaultHasher` in `std`). Thus, we drop the `ahash` dependency entirely here and simply wrap `SipHasher` for our `no-std` HashMaps.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| //! Generally LDK uses `std`'s `HashMap`s, however when building for no-std, LDK uses `hashbrown`'s | ||
| //! `HashMap`s with the `std` `SipHasher` and uses `getrandom` to opportunistically randomize it, | ||
| //! if randomization is available. | ||
| //! | ||
| //! This module simply re-exports the `HashMap` used in LDK for public consumption. | ||
| #[cfg(feature = "hashbrown")] | ||
| extern crate hashbrown; | ||
| #[cfg(feature = "possiblyrandom")] | ||
| extern crate possiblyrandom; | ||
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| // For no-std builds, we need to use hashbrown, however, by default, it doesn't randomize the | ||
| // hashing and is vulnerable to HashDoS attacks. Thus, we use the core SipHasher when not using | ||
| // std, but use `getrandom` to randomize it if its available. | ||
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| #[cfg(not(feature = "hashbrown"))] | ||
| mod std_hashtables { | ||
| pub use std::collections::HashMap; | ||
| pub use std::collections::hash_map::RandomState; | ||
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| pub(crate) use std::collections::{HashSet, hash_map}; | ||
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| pub(crate) type OccupiedHashMapEntry<'a, K, V> = | ||
| std::collections::hash_map::OccupiedEntry<'a, K, V>; | ||
| pub(crate) type VacantHashMapEntry<'a, K, V> = | ||
| std::collections::hash_map::VacantEntry<'a, K, V>; | ||
| } | ||
| #[cfg(not(feature = "hashbrown"))] | ||
| pub use std_hashtables::*; | ||
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| #[cfg(feature = "hashbrown")] | ||
| pub(crate) use self::hashbrown::hash_map; | ||
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| #[cfg(all(feature = "hashbrown", fuzzing))] | ||
| mod nonrandomized_hashbrown { | ||
| pub use hashbrown::HashMap; | ||
| pub use std::collections::hash_map::RandomState; | ||
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|
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| pub(crate) use hashbrown::HashSet; | ||
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| pub(crate) type OccupiedHashMapEntry<'a, K, V> = | ||
| hashbrown::hash_map::OccupiedEntry<'a, K, V, hashbrown::hash_map::DefaultHashBuilder>; | ||
| pub(crate) type VacantHashMapEntry<'a, K, V> = | ||
| hashbrown::hash_map::VacantEntry<'a, K, V, hashbrown::hash_map::DefaultHashBuilder>; | ||
| } | ||
| #[cfg(all(feature = "hashbrown", fuzzing))] | ||
| pub use nonrandomized_hashbrown::*; | ||
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| #[cfg(all(feature = "hashbrown", not(fuzzing)))] | ||
| mod randomized_hashtables { | ||
| #[cfg(feature = "std")] | ||
| mod hasher { | ||
| pub use std::collections::hash_map::RandomState; | ||
| } | ||
| #[cfg(not(feature = "std"))] | ||
| mod hasher { | ||
| #![allow(deprecated)] // hash::SipHasher was deprecated in favor of something only in std. | ||
| use core::hash::{BuildHasher, SipHasher}; | ||
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| #[derive(Clone, Copy)] | ||
| /// A simple implementation of [`BuildHasher`] that uses `getrandom` to opportunistically | ||
| /// randomize, if the platform supports it. | ||
| pub struct RandomState { | ||
| k0: u64, k1: u64, | ||
| } | ||
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| impl RandomState { | ||
| /// Constructs a new [`RandomState`] which may or may not be random, depending on the | ||
| /// target platform. | ||
| pub fn new() -> RandomState { | ||
| let (k0, k1); | ||
| #[cfg(feature = "possiblyrandom")] { | ||
| let mut keys = [0; 16]; | ||
| possiblyrandom::getpossiblyrandom(&mut keys); | ||
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| let mut k0_bytes = [0; 8]; | ||
| let mut k1_bytes = [0; 8]; | ||
| k0_bytes.copy_from_slice(&keys[..8]); | ||
| k1_bytes.copy_from_slice(&keys[8..]); | ||
| k0 = u64::from_le_bytes(k0_bytes); | ||
| k1 = u64::from_le_bytes(k1_bytes); | ||
| } | ||
| #[cfg(not(feature = "possiblyrandom"))] { | ||
| k0 = 0; | ||
| k1 = 0; | ||
| } | ||
| RandomState { k0, k1 } | ||
| } | ||
| } | ||
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| impl Default for RandomState { | ||
| fn default() -> RandomState { RandomState::new() } | ||
| } | ||
|
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| impl BuildHasher for RandomState { | ||
| type Hasher = SipHasher; | ||
| fn build_hasher(&self) -> SipHasher { | ||
| SipHasher::new_with_keys(self.k0, self.k1) | ||
| } | ||
| } | ||
| } | ||
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| pub use hasher::*; | ||
| use super::*; | ||
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| /// The HashMap type used in LDK. | ||
| pub type HashMap<K, V> = hashbrown::HashMap<K, V, RandomState>; | ||
| pub(crate) type HashSet<K> = hashbrown::HashSet<K, RandomState>; | ||
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| pub(crate) type OccupiedHashMapEntry<'a, K, V> = | ||
| hashbrown::hash_map::OccupiedEntry<'a, K, V, RandomState>; | ||
| pub(crate) type VacantHashMapEntry<'a, K, V> = | ||
| hashbrown::hash_map::VacantEntry<'a, K, V, RandomState>; | ||
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| pub(crate) fn new_hash_map<K, V>() -> HashMap<K, V> { | ||
| HashMap::with_hasher(RandomState::new()) | ||
| } | ||
| pub(crate) fn hash_map_with_capacity<K, V>(cap: usize) -> HashMap<K, V> { | ||
| HashMap::with_capacity_and_hasher(cap, RandomState::new()) | ||
| } | ||
| pub(crate) fn hash_map_from_iter<K: core::hash::Hash + Eq, V, I: IntoIterator<Item=(K, V)>>(iter: I) -> HashMap<K, V> { | ||
| let iter = iter.into_iter(); | ||
| let min_size = iter.size_hint().0; | ||
| let mut res = HashMap::with_capacity_and_hasher(min_size, RandomState::new()); | ||
| res.extend(iter); | ||
| res | ||
| } | ||
|
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| pub(crate) fn new_hash_set<K>() -> HashSet<K> { | ||
| HashSet::with_hasher(RandomState::new()) | ||
| } | ||
| pub(crate) fn hash_set_with_capacity<K>(cap: usize) -> HashSet<K> { | ||
| HashSet::with_capacity_and_hasher(cap, RandomState::new()) | ||
| } | ||
| pub(crate) fn hash_set_from_iter<K: core::hash::Hash + Eq, I: IntoIterator<Item=K>>(iter: I) -> HashSet<K> { | ||
| let iter = iter.into_iter(); | ||
| let min_size = iter.size_hint().0; | ||
| let mut res = HashSet::with_capacity_and_hasher(min_size, RandomState::new()); | ||
| res.extend(iter); | ||
| res | ||
| } | ||
| } | ||
| #[cfg(all(feature = "hashbrown", not(fuzzing)))] | ||
| pub use randomized_hashtables::*; | ||
|
|
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| #[cfg(any(not(feature = "hashbrown"), fuzzing))] | ||
| mod hashtable_constructors { | ||
| use super::*; | ||
|
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| pub(crate) fn new_hash_map<K, V>() -> HashMap<K, V> { HashMap::new() } | ||
| pub(crate) fn hash_map_with_capacity<K, V>(cap: usize) -> HashMap<K, V> { | ||
| HashMap::with_capacity(cap) | ||
| } | ||
| pub(crate) fn hash_map_from_iter<K: core::hash::Hash + Eq, V, I: IntoIterator<Item=(K, V)>>(iter: I) -> HashMap<K, V> { | ||
| HashMap::from_iter(iter) | ||
| } | ||
|
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| pub(crate) fn new_hash_set<K>() -> HashSet<K> { HashSet::new() } | ||
| pub(crate) fn hash_set_with_capacity<K>(cap: usize) -> HashSet<K> { | ||
| HashSet::with_capacity(cap) | ||
| } | ||
| pub(crate) fn hash_set_from_iter<K: core::hash::Hash + Eq, I: IntoIterator<Item=K>>(iter: I) -> HashSet<K> { | ||
| HashSet::from_iter(iter) | ||
| } | ||
| } | ||
| #[cfg(any(not(feature = "hashbrown"), fuzzing))] | ||
| pub(crate) use hashtable_constructors::*; |
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