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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 5ea087d177
commit 55e845fe12
17 changed files with 168 additions and 78 deletions
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5
crypto/ciphersuite/src/lib.rs
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@@ -3,10 +3,8 @@
#![cfg_attr(not(feature = "std"), no_std)]
use core::fmt::Debug;
#[cfg(feature = "alloc")]
#[allow(unused_imports)]
use std_shims::prelude::*;
#[cfg(feature = "alloc")]
use std_shims::io::{self, Read};
use subtle::{CtOption, ConstantTimeEq, ConditionallySelectable};
@@ -112,7 +110,6 @@ pub trait GroupCanonicalEncoding: WrappedGroup {
}
/// `std::io` extensions for `GroupCanonicalEncoding.`
#[cfg(feature = "alloc")]
#[allow(non_snake_case)]
pub trait GroupIo: GroupCanonicalEncoding {
/// Read a canonical field element from something implementing `std::io::Read`.
@@ -129,8 +126,6 @@ pub trait GroupIo: GroupCanonicalEncoding {
}
/// Read a canonical point from something implementing `std::io::Read`.
#[cfg(feature = "alloc")]
#[allow(non_snake_case)]
fn read_G<R: Read>(reader: &mut R) -> io::Result<Self::G> {
let mut bytes = <Self::G as GroupEncoding>::Repr::default();
reader.read_exact(bytes.as_mut())?;