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Update to last circomlib version
On a Intel(R) Core(TM) i7-8705G CPU @ 3.10GHz, with 32 GB of RAM: - Before ff: hash time: [927.61 us 927.78 us 927.98 us] - Previous commit: hash time: [26.495 us 26.503 us 26.512 us] - New: hash time: [9.8622 us 9.9953 us 10.127 us]master
6 changed files with 105 additions and 277 deletions
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+3 -0Cargo.toml
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+2 -5benches/bench_mimc_hash.rs
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+0 -3gen_constants/.gitignore
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+0 -14gen_constants/Cargo.toml
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+0 -122gen_constants/src/main.rs
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+100 -133src/lib.rs
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/target |
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**/*.rs.bk |
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Cargo.lock |
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[package] |
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name = "gen_constants" |
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version = "0.1.0" |
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authors = ["arnaucube <root@arnaucube.com>"] |
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edition = "2018" |
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html |
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[dependencies] |
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num = "0.2.0" |
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num-bigint = "0.2.2" |
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num-traits = "0.2.8" |
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tiny-keccak = "1.5" |
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rustc-hex = "1.0.0" |
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extern crate num;
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extern crate num_bigint;
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extern crate num_traits;
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use tiny_keccak::Keccak;
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use num_bigint::{BigInt, Sign};
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use num_traits::Zero;
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const SEED: &str = "mimc";
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pub struct Constants {
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// seed_hash: BigInt,
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// iv: BigInt,
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r: BigInt,
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n_rounds: i64,
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cts: Vec<BigInt>,
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}
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pub fn modulus(a: &BigInt, m: &BigInt) -> BigInt {
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((a % m) + m) % m
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}
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pub fn generate_constants() -> Constants {
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let r: BigInt = BigInt::parse_bytes(
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b"21888242871839275222246405745257275088548364400416034343698204186575808495617",
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10,
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)
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.unwrap();
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let mut keccak = Keccak::new_keccak256();
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let mut h = [0u8; 32];
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keccak.update(SEED.as_bytes());
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keccak.finalize(&mut h);
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let mut keccak = Keccak::new_keccak256();
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let mut h_iv = [0u8; 32];
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let seed_iv = format!("{}{}", SEED, "_iv");
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keccak.update(seed_iv.as_bytes());
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keccak.finalize(&mut h_iv);
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// let seed_hash: BigInt = BigInt::from_bytes_be(Sign::Plus, &h);
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// let c: BigInt = BigInt::from_bytes_be(Sign::Plus, &h_iv);
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// let iv: BigInt = c % &r;
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let n_rounds: i64 = 91;
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let cts = get_constants(&r, SEED, n_rounds);
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Constants {
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// seed_hash: seed_hash,
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// iv: iv,
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r: r,
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n_rounds: n_rounds,
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cts: cts,
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}
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}
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pub fn get_constants(r: &BigInt, seed: &str, n_rounds: i64) -> Vec<BigInt> {
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let mut cts: Vec<BigInt> = Vec::new();
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cts.push(Zero::zero());
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let mut keccak = Keccak::new_keccak256();
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let mut h = [0u8; 32];
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keccak.update(seed.as_bytes());
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keccak.finalize(&mut h);
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let mut c = BigInt::from_bytes_be(Sign::Plus, &h);
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for _ in 1..n_rounds {
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let (_, c_bytes) = c.to_bytes_be();
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let mut c_bytes32: [u8; 32] = [0; 32];
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let diff = c_bytes32.len() - c_bytes.len();
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c_bytes32[diff..].copy_from_slice(&c_bytes[..]);
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let mut keccak = Keccak::new_keccak256();
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let mut h = [0u8; 32];
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keccak.update(&c_bytes[..]);
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keccak.finalize(&mut h);
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c = BigInt::from_bytes_be(Sign::Plus, &h);
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let n = modulus(&c, &r);
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cts.push(n);
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}
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// let l = cts.len();
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// cts[l-1] = Zero::zero();
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cts
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}
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fn main() {
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let c = generate_constants();
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println!("let cts_str: Vec<&str> = vec![");
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for i in 0..c.cts.len() {
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println!(" {:?},", c.cts[i].to_string());
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}
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println!("];");
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println!("let n_rounds: i64 = {:?};", c.n_rounds);
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use rustc_hex::ToHex;
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#[test]
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fn test_sha3() {
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let mut keccak = Keccak::new_keccak256();
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let mut res = [0u8; 32];
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keccak.update(SEED.as_bytes());
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keccak.finalize(&mut res);
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assert_eq!(
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res.to_hex(),
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"b6e489e6b37224a50bebfddbe7d89fa8fdcaa84304a70bd13f79b5d9f7951e9e"
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);
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let mut keccak = Keccak::new_keccak256();
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let mut res = [0u8; 32];
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keccak.update(SEED.as_bytes());
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keccak.finalize(&mut res);
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let c = BigInt::from_bytes_be(Sign::Plus, &res);
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assert_eq!(
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c.to_string(),
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"82724731331859054037315113496710413141112897654334566532528783843265082629790"
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);
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}
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}
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