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Updated Bn128PairingImpl to use optimized batch pairing (#10765)

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* Bn128PairingImpl uses pairing_batch method in bn

* updated Cargo.lock
This commit is contained in:
Seun LanLege 2019-06-20 22:16:11 +01:00 committed by David
parent 78d0a8696f
commit 213e007a4b
2 changed files with 5 additions and 3 deletions
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4
Cargo.lock generated
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@ -264,11 +264,13 @@ dependencies = [
[[package]]
name = "bn"
version = "0.4.4"
source = "git+https://github.com/paritytech/bn#2a71dbde5ca93451c8da2135767896a64483759e"
source = "git+https://github.com/paritytech/bn#6beba2ed6c9351622f9e948ccee4063846b2b39a"
dependencies = [
"byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"crunchy 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-hex 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]

4
ethcore/src/builtin.rs
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@ -498,7 +498,7 @@ impl Impl for Bn128PairingImpl {
impl Bn128PairingImpl {
fn execute_with_error(&self, input: &[u8], output: &mut BytesRef) -> Result<(), Error> {
use bn::{AffineG1, AffineG2, Fq, Fq2, pairing, G1, G2, Gt, Group};
use bn::{AffineG1, AffineG2, Fq, Fq2, pairing_batch, G1, G2, Gt, Group};
let elements = input.len() / 192; // (a, b_a, b_b - each 64-byte affine coordinates)
let ret_val = if input.len() == 0 {
@ -539,7 +539,7 @@ impl Bn128PairingImpl {
vals.push((a, b));
};
let mul = vals.into_iter().fold(Gt::one(), |s, (a, b)| s * pairing(a, b));
let mul = pairing_batch(&vals);
if mul == Gt::one() {
U256::one()