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Expose std_shims::io on core

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The `io::Write` trait is somewhat worthless, being implemented for nothing, yet
`Read` remains fully functional. This also allows using its polyfills _without_
requiring `alloc`.

Opportunity taken to make `schnorr-signatures` not require `alloc`.

This will require a version bump before being published due to newly requiring
the `alloc` feature be specified to maintain pre-existing behavior.

Enables resolving https://github.com/monero-oxide/monero-oxide/issues/48.
This commit is contained in:
Luke Parker
2025-09-15 21:21:30 -04:00
parent 3bd48974f3
commit 95909d83a4
17 changed files with 168 additions and 78 deletions
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23
crypto/schnorr/src/lib.rs
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@@ -3,14 +3,15 @@
#![cfg_attr(not(feature = "std"), no_std)]
use core::ops::Deref;
#[cfg(not(feature = "std"))]
#[macro_use]
#[cfg(all(feature = "alloc", not(feature = "std")))]
extern crate alloc;
use std_shims::{
vec::Vec,
io::{self, Read, Write},
};
#[cfg(all(feature = "alloc", not(feature = "std")))]
use alloc::vec::Vec;
#[allow(unused_imports)]
use std_shims::prelude::*;
use std_shims::io::{self, Read, Write};
#[cfg(feature = "alloc")]
use rand_core::{RngCore, CryptoRng};
use zeroize::{Zeroize, Zeroizing};
@@ -22,6 +23,7 @@ use ciphersuite::{
},
GroupIo,
};
#[cfg(feature = "alloc")]
use multiexp::{multiexp_vartime, BatchVerifier};
/// Half-aggregation from <https://eprint.iacr.org/2021/350>.
@@ -59,6 +61,7 @@ impl<C: GroupIo> SchnorrSignature<C> {
}
/// Serialize a SchnorrSignature, returning a `Vec<u8>`.
#[cfg(feature = "alloc")]
pub fn serialize(&self) -> Vec<u8> {
let mut buf = vec![];
self.write(&mut buf).unwrap();
@@ -106,7 +109,12 @@ impl<C: GroupIo> SchnorrSignature<C> {
/// different keys/messages.
#[must_use]
pub fn verify(&self, public_key: C::G, challenge: C::F) -> bool {
multiexp_vartime(&self.batch_statements(public_key, challenge)).is_identity().into()
let statements = self.batch_statements(public_key, challenge);
#[cfg(feature = "alloc")]
let res = multiexp_vartime(&statements);
#[cfg(not(feature = "alloc"))]
let res = statements.into_iter().map(|(scalar, point)| point * scalar).sum::<C::G>();
res.is_identity().into()
}
/// Queue a signature for batch verification.
@@ -114,6 +122,7 @@ impl<C: GroupIo> SchnorrSignature<C> {
/// This challenge must be properly crafted, which means being binding to the public key, nonce,
/// and any message. Failure to do so will let a malicious adversary to forge signatures for
/// different keys/messages.
#[cfg(feature = "alloc")]
pub fn batch_verify<R: RngCore + CryptoRng, I: Copy + Zeroize>(
&self,
rng: &mut R,