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Use a Vec for the Monero generators, preventing its massive stack usage

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The amount of stack usage did cause issues on m1 computers.
This commit is contained in:
Luke Parker 2023-09-20 04:31:16 -04:00
parent 98ab6acbd5
commit c62d9b448f
No known key found for this signature in database
2 changed files with 8 additions and 9 deletions
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4
coins/monero/build.rs
View file

@ -44,10 +44,10 @@ fn generators(prefix: &'static str, path: &str) {
pub(crate) static GENERATORS_CELL: OnceLock<Generators> = OnceLock::new();
pub fn GENERATORS() -> &'static Generators {{
GENERATORS_CELL.get_or_init(|| Generators {{
G: [
G: vec![
{G_str}
],
H: [
H: vec![
{H_str}
],
}})

13
coins/monero/generators/src/lib.rs
View file

@ -5,7 +5,7 @@
#![cfg_attr(not(feature = "std"), no_std)]
use std_shims::sync::OnceLock;
use std_shims::{sync::OnceLock, vec::Vec};
use sha3::{Digest, Keccak256};
@ -56,14 +56,13 @@ const MAX_MN: usize = MAX_M * N;
/// Container struct for Bulletproofs(+) generators.
#[allow(non_snake_case)]
pub struct Generators {
pub G: [EdwardsPoint; MAX_MN],
pub H: [EdwardsPoint; MAX_MN],
pub G: Vec<EdwardsPoint>,
pub H: Vec<EdwardsPoint>,
}
/// Generate generators as needed for Bulletproofs(+), as Monero does.
pub fn bulletproofs_generators(dst: &'static [u8]) -> Generators {
let mut res =
Generators { G: [EdwardsPoint::identity(); MAX_MN], H: [EdwardsPoint::identity(); MAX_MN] };
let mut res = Generators { G: Vec::with_capacity(MAX_MN), H: Vec::with_capacity(MAX_MN) };
for i in 0 .. MAX_MN {
let i = 2 * i;
@ -73,8 +72,8 @@ pub fn bulletproofs_generators(dst: &'static [u8]) -> Generators {
write_varint(&i.try_into().unwrap(), &mut even).unwrap();
write_varint(&(i + 1).try_into().unwrap(), &mut odd).unwrap();
res.H[i / 2] = EdwardsPoint(hash_to_point(hash(&even)));
res.G[i / 2] = EdwardsPoint(hash_to_point(hash(&odd)));
res.H.push(EdwardsPoint(hash_to_point(hash(&even))));
res.G.push(EdwardsPoint(hash_to_point(hash(&odd))));
}
res
}