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chore: Add more Hash impls to stdlib #4470

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Mar 14, 2024
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chore: Add more Hash impls to stdlib #4470

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101 changes: 97 additions & 4 deletions noir_stdlib/src/hash.nr
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ mod poseidon2;
mod pedersen;

use crate::default::Default;
use crate::uint128::U128;

#[foreign(sha256)]
// docs:start:sha256
Expand Down Expand Up @@ -120,10 +121,102 @@ where
}
}

// TODO: add implementations for the remainder of primitive types.
impl Hash for Field{
impl Hash for Field {
fn hash<H>(self, state: &mut H) where H: Hasher{
let input: [Field] = [self];
H::write(state, input);
H::write(state, [self]);
}
}

impl Hash for u8 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for u32 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for u64 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for i8 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for i32 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for i64 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for bool {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self as Field]);
}
}

impl Hash for () {
fn hash<H>(_self: Self, _state: &mut H) where H: Hasher {}
}

impl Hash for U128 {
fn hash<H>(self, state: &mut H) where H: Hasher{
H::write(state, [self.lo as Field, self.hi as Field]);
}
}

impl<T, N> Hash for [T; N] where T: Hash {
fn hash<H>(self, state: &mut H) where H: Hasher{
for elem in self {
elem.hash(state);
}
}
}

impl<A, B> Hash for (A, B) where A: Hash, B: Hash {
fn hash<H>(self, state: &mut H) where H: Hasher{
self.0.hash(state);
self.1.hash(state);
}
}

impl<A, B, C> Hash for (A, B, C) where A: Hash, B: Hash, C: Hash {
fn hash<H>(self, state: &mut H) where H: Hasher{
self.0.hash(state);
self.1.hash(state);
self.2.hash(state);
}
}

impl<A, B, C, D> Hash for (A, B, C, D) where A: Hash, B: Hash, C: Hash, D: Hash {
fn hash<H>(self, state: &mut H) where H: Hasher{
self.0.hash(state);
self.1.hash(state);
self.2.hash(state);
self.3.hash(state);
}
}

impl<A, B, C, D, E> Hash for (A, B, C, D, E) where A: Hash, B: Hash, C: Hash, D: Hash, E: Hash {
fn hash<H>(self, state: &mut H) where H: Hasher{
self.0.hash(state);
self.1.hash(state);
self.2.hash(state);
self.3.hash(state);
self.4.hash(state);
}
}
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