saymrwulf/betrusted-curve25519-dalek-source
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Use 128-bit scalars

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This commit is contained in:
Henry de Valence 2018-07-26 21:09:52 -07:00
parent f60987dee5
commit 4c838decd8
2 changed files with 8 additions and 2 deletions
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1
Cargo.toml
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@ -22,6 +22,7 @@ default-features = false
[dependencies.rand]
version = "0.5"
default-features = false
features = ["i128_support"]
[dependencies.digest]
version = "^0.7"

9
src/ed25519.rs
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@ -935,13 +935,18 @@ where
use std::vec::Vec;
use core::iter::once;
use rand::thread_rng;
use curve25519_dalek::traits::IsIdentity;
use curve25519_dalek::traits::VartimeMultiscalarMul;
let zs: Vec<Scalar> = signatures.iter().map(|_| Scalar::random(csprng)).collect();
// Select a random 128-bit scalar for each signature.
let zs: Vec<Scalar> = signatures
.iter()
.map(|_| Scalar::from(thread_rng().gen::<u128>()))
.collect();
// Compute z $= ℤ/lℤ, (∑ s[i]z[i] (mod l))
// Compute the basepoint coefficient, ∑ s[i]z[i] (mod l)
let B_coefficient: Scalar = signatures
.iter()
.map(|sig| sig.s)