#![allow(clippy::needless_range_loop)]
use ark_bn254::Fr;
use ark_ff::fields::Field;
use ark_std::Zero;
use ark_std::str::FromStr;
use core::ops::AddAssign;
use core::ops::MulAssign;
mod constants;
pub static POSEIDON: std::sync::LazyLock<Poseidon> = std::sync::LazyLock::new(Poseidon::new);
#[derive(Debug)]
struct Constants {
pub c: Vec<Vec<Fr>>,
pub m: Vec<Vec<Vec<Fr>>>,
pub n_rounds_f: usize,
pub n_rounds_p: Vec<usize>,
}
fn load_constants() -> Constants {
let (c_str, m_str) = constants::constants();
let mut c: Vec<Vec<Fr>> = Vec::new();
for i in 0..c_str.len() {
let mut cci: Vec<Fr> = Vec::new();
for j in 0..c_str[i].len() {
let b: Fr = Fr::from_str(c_str[i][j]).unwrap();
cci.push(b);
}
c.push(cci);
}
let mut m: Vec<Vec<Vec<Fr>>> = Vec::new();
for i in 0..m_str.len() {
let mut mi: Vec<Vec<Fr>> = Vec::new();
for j in 0..m_str[i].len() {
let mut mij: Vec<Fr> = Vec::new();
for k in 0..m_str[i][j].len() {
let b: Fr = Fr::from_str(m_str[i][j][k]).unwrap();
mij.push(b);
}
mi.push(mij);
}
m.push(mi);
}
Constants {
c,
m,
n_rounds_f: 8,
n_rounds_p: vec![
56, 57, 56, 60, 60, 63, 64, 63, 60, 66, 60, 65, 70, 60, 64, 68,
],
}
}
pub struct Poseidon {
constants: Constants,
}
impl Poseidon {
pub fn new() -> Poseidon {
Poseidon {
constants: load_constants(),
}
}
fn ark(&self, state: &mut [Fr], c: &[Fr], it: usize) {
for i in 0..state.len() {
state[i].add_assign(&c[it + i]);
}
}
fn sbox(&self, n_rounds_f: usize, n_rounds_p: usize, state: &mut [Fr], i: usize) {
if i < n_rounds_f / 2 || i >= n_rounds_f / 2 + n_rounds_p {
for j in 0..state.len() {
let aux = state[j];
state[j] = state[j].square();
state[j] = state[j].square();
state[j].mul_assign(&aux);
}
} else {
let aux = state[0];
state[0] = state[0].square();
state[0] = state[0].square();
state[0].mul_assign(&aux);
}
}
fn mix(&self, state: &[Fr], m: &[Vec<Fr>]) -> Vec<Fr> {
let mut new_state: Vec<Fr> = Vec::new();
for i in 0..state.len() {
new_state.push(Fr::zero());
for j in 0..state.len() {
let mut mij = m[i][j];
mij.mul_assign(&state[j]);
new_state[i].add_assign(&mij);
}
}
new_state.clone()
}
pub fn hash(&self, inp: &[Fr]) -> Result<Fr, String> {
let t = inp.len() + 1;
if inp.is_empty() || inp.len() > self.constants.n_rounds_p.len() {
return Err("Wrong inputs length".to_string());
}
let n_rounds_f = self.constants.n_rounds_f;
let n_rounds_p = self.constants.n_rounds_p[t - 2];
let mut state = vec![Fr::zero(); t];
state[1..].clone_from_slice(inp);
for i in 0..(n_rounds_f + n_rounds_p) {
self.ark(&mut state, &self.constants.c[t - 2], i * t);
self.sbox(n_rounds_f, n_rounds_p, &mut state, i);
state = self.mix(&state, &self.constants.m[t - 2]);
}
Ok(state[0])
}
}
#[cfg(test)]
mod tests {
use super::*;
#[cfg(test)]
#[cfg(target_arch = "wasm32")]
use wasm_bindgen_test::wasm_bindgen_test as test;
#[test]
fn test_load_constants() {
let cons = load_constants();
assert_eq!(
cons.c[0][0].to_string(),
"4417881134626180770308697923359573201005643519861877412381846989312604493735"
);
assert_eq!(
cons.c[cons.c.len() - 1][0].to_string(),
"21579410516734741630578831791708254656585702717204712919233299001262271512412"
);
assert_eq!(
cons.m[0][0][0].to_string(),
"2910766817845651019878574839501801340070030115151021261302834310722729507541"
);
assert_eq!(
cons.m[cons.m.len() - 1][0][0].to_string(),
"11497693837059016825308731789443585196852778517742143582474723527597064448312"
);
}
#[test]
fn test_hash() {
let b0: Fr = Fr::from_str("0").unwrap();
let b1: Fr = Fr::from_str("1").unwrap();
let b2: Fr = Fr::from_str("2").unwrap();
let b3: Fr = Fr::from_str("3").unwrap();
let b4: Fr = Fr::from_str("4").unwrap();
let b5: Fr = Fr::from_str("5").unwrap();
let b6: Fr = Fr::from_str("6").unwrap();
let b7: Fr = Fr::from_str("7").unwrap();
let b8: Fr = Fr::from_str("8").unwrap();
let b9: Fr = Fr::from_str("9").unwrap();
let b10: Fr = Fr::from_str("10").unwrap();
let b11: Fr = Fr::from_str("11").unwrap();
let b12: Fr = Fr::from_str("12").unwrap();
let b13: Fr = Fr::from_str("13").unwrap();
let b14: Fr = Fr::from_str("14").unwrap();
let b15: Fr = Fr::from_str("15").unwrap();
let b16: Fr = Fr::from_str("16").unwrap();
let poseidon = Poseidon::new();
let big_arr: Vec<Fr> = vec![b1];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"18586133768512220936620570745912940619677854269274689475585506675881198879027"
);
let big_arr: Vec<Fr> = vec![b1, b2];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"7853200120776062878684798364095072458815029376092732009249414926327459813530"
);
let big_arr: Vec<Fr> = vec![b1, b2, b0, b0, b0];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"1018317224307729531995786483840663576608797660851238720571059489595066344487"
);
let big_arr: Vec<Fr> = vec![b1, b2, b0, b0, b0, b0];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"15336558801450556532856248569924170992202208561737609669134139141992924267169"
);
let big_arr: Vec<Fr> = vec![b3, b4, b0, b0, b0];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"5811595552068139067952687508729883632420015185677766880877743348592482390548"
);
let big_arr: Vec<Fr> = vec![b3, b4, b0, b0, b0, b0];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"12263118664590987767234828103155242843640892839966517009184493198782366909018"
);
let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"20400040500897583745843009878988256314335038853985262692600694741116813247201"
);
let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"8354478399926161176778659061636406690034081872658507739535256090879947077494"
);
let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, b0, b0, b0, b0];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"5540388656744764564518487011617040650780060800286365721923524861648744699539"
);
let big_arr: Vec<Fr> = vec![
b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, b0, b0, b0, b0, b0, b0,
];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"11882816200654282475720830292386643970958445617880627439994635298904836126497"
);
let big_arr: Vec<Fr> = vec![
b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16,
];
let h = poseidon.hash(&big_arr).unwrap();
assert_eq!(
h.to_string(),
"9989051620750914585850546081941653841776809718687451684622678807385399211877"
);
}
#[test]
fn test_wrong_inputs() {
let b0: Fr = Fr::from_str("0").unwrap();
let b1: Fr = Fr::from_str("1").unwrap();
let b2: Fr = Fr::from_str("2").unwrap();
let poseidon = Poseidon::new();
let big_arr: Vec<Fr> = vec![
b1, b2, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0,
];
poseidon.hash(&big_arr).expect_err("Wrong inputs length");
}
}