tornado-packages/phase2-bn254
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providing entropy for the wasm contribution

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Alexey 2020-03-11 12:50:13 +03:00 committed by poma
parent 89e71c5d18
commit 8512a497a7
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GPG Key ID: BA20CB01FE165657
1 changed files with 25 additions and 3 deletions
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28
phase2/src/lib.rs
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@ -12,6 +12,7 @@ extern crate num_bigint;
extern crate num_traits;
extern crate cfg_if;
extern crate itertools;
extern crate blake2;
use cfg_if::cfg_if;
@ -29,7 +30,6 @@ cfg_if! {
extern crate web_sys;
extern crate wasm_bindgen;
extern crate console_error_panic_hook;
extern crate itertools;
use wasm_bindgen::prelude::*;
use itertools::Itertools;
@ -44,12 +44,34 @@ cfg_if! {
}
#[wasm_bindgen]
pub fn contribute(params: Vec<u8>) -> Result<Vec<u8>, JsValue> {
pub fn contribute(params: Vec<u8>, entropy: Vec<u8>) -> Result<Vec<u8>, JsValue> {
console_error_panic_hook::set_once();
let disallow_points_at_infinity = false;
log!("Initializing phase2");
let mut rng = &mut rand::XorShiftRng::new_unseeded(); // TODO: change this unsafe unseeded random (!)
// Create an RNG based on provided randomness
let mut rng = {
use byteorder::{BigEndian, ReadBytesExt};
use blake2::{Blake2b, Digest};
use rand::{SeedableRng};
use rand::chacha::ChaChaRng;
let h = {
let mut h = Blake2b::default();
h.input(&*entropy);
h.result()
};
let mut digest = &h[..];
// Interpret the first 32 bytes of the digest as 8 32-bit words
let mut seed = [0u32; 8];
for i in 0..8 {
seed[i] = digest.read_u32::<BigEndian>().expect("digest is large enough for this to work");
}
ChaChaRng::from_seed(&seed)
};
let mut params = MPCParameters::read(&*params, disallow_points_at_infinity, true).expect("unable to read params");
log!("Contributing...");