extern crate rand;
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#[macro_use]
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extern crate ff;
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use ff::*;
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#[derive(PrimeField)]
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#[PrimeFieldModulus = "21888242871839275222246405745257275088548364400416034343698204186575808495617"]
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#[PrimeFieldGenerator = "7"]
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pub struct Fr(FrRepr);
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mod constants;
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#[derive(Debug)]
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pub struct Constants {
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pub c: Vec<Vec<Fr>>,
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pub m: Vec<Vec<Vec<Fr>>>,
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pub n_rounds_f: usize,
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pub n_rounds_p: Vec<usize>,
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}
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pub fn load_constants() -> Constants {
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let (c_str, m_str) = constants::constants();
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let mut c: Vec<Vec<Fr>> = Vec::new();
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for i in 0..c_str.len() {
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let mut cci: Vec<Fr> = Vec::new();
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for j in 0..c_str[i].len() {
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let b: Fr = Fr::from_str(c_str[i][j]).unwrap();
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cci.push(b);
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}
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c.push(cci);
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}
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let mut m: Vec<Vec<Vec<Fr>>> = Vec::new();
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for i in 0..m_str.len() {
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let mut mi: Vec<Vec<Fr>> = Vec::new();
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for j in 0..m_str[i].len() {
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let mut mij: Vec<Fr> = Vec::new();
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for k in 0..m_str[i][j].len() {
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let b: Fr = Fr::from_str(m_str[i][j][k]).unwrap();
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mij.push(b);
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}
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mi.push(mij);
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}
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m.push(mi);
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}
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Constants {
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c,
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m,
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n_rounds_f: 8,
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n_rounds_p: vec![
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56, 57, 56, 60, 60, 63, 64, 63, 60, 66, 60, 65, 70, 60, 64, 68,
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],
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}
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}
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pub struct Poseidon {
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constants: Constants,
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}
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impl Poseidon {
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pub fn new() -> Poseidon {
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Poseidon {
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constants: load_constants(),
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}
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}
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pub fn ark(&self, state: &mut Vec<Fr>, c: &Vec<Fr>, it: usize) {
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for i in 0..state.len() {
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state[i].add_assign(&c[it + i]);
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}
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}
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pub fn sbox(&self, n_rounds_f: usize, n_rounds_p: usize, state: &mut Vec<Fr>, i: usize) {
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if i < n_rounds_f / 2 || i >= n_rounds_f / 2 + n_rounds_p {
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for j in 0..state.len() {
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let aux = state[j];
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state[j].square();
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state[j].square();
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state[j].mul_assign(&aux);
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}
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} else {
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let aux = state[0];
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state[0].square();
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state[0].square();
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state[0].mul_assign(&aux);
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}
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}
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pub fn mix(&self, state: &Vec<Fr>, m: &Vec<Vec<Fr>>) -> Vec<Fr> {
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let mut new_state: Vec<Fr> = Vec::new();
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for i in 0..state.len() {
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new_state.push(Fr::zero());
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for j in 0..state.len() {
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let mut mij = m[i][j];
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mij.mul_assign(&state[j]);
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new_state[i].add_assign(&mij);
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}
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}
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new_state.clone()
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}
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pub fn hash(&self, inp: Vec<Fr>) -> Result<Fr, String> {
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let t = inp.len() + 1;
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// if inp.len() == 0 || inp.len() >= self.constants.n_rounds_p.len() - 1 {
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if inp.is_empty() || inp.len() > self.constants.n_rounds_p.len() {
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return Err("Wrong inputs length".to_string());
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}
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let n_rounds_f = self.constants.n_rounds_f.clone();
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let n_rounds_p = self.constants.n_rounds_p[t - 2].clone();
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let mut state = vec![Fr::zero(); t];
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state[1..].clone_from_slice(&inp);
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for i in 0..(n_rounds_f + n_rounds_p) {
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self.ark(&mut state, &self.constants.c[t - 2], i * t);
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self.sbox(n_rounds_f, n_rounds_p, &mut state, i);
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state = self.mix(&state, &self.constants.m[t - 2]);
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}
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Ok(state[0])
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}
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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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#[test]
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fn test_ff() {
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let a = Fr::from_repr(FrRepr::from(2)).unwrap();
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assert_eq!(
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"0000000000000000000000000000000000000000000000000000000000000002",
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to_hex(&a)
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);
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let b: Fr = Fr::from_str(
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"21888242871839275222246405745257275088548364400416034343698204186575808495619",
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)
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.unwrap();
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assert_eq!(
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"0000000000000000000000000000000000000000000000000000000000000002",
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to_hex(&b)
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);
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assert_eq!(&a, &b);
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}
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// #[test]
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// fn test_load_constants() {
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// let cons = load_constants();
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// assert_eq!(
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// cons.c[0][0].to_string(),
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// "Fr(0x09c46e9ec68e9bd4fe1faaba294cba38a71aa177534cdd1b6c7dc0dbd0abd7a7)"
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// );
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// assert_eq!(
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// cons.c[cons.c.len() - 1][0].to_string(),
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// "Fr(0x2088ce9534577bf38be7bc457f2756d558d66e0c07b9cc001a580bd42cda0e77)"
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// );
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// assert_eq!(
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// cons.m[0][0][0].to_string(),
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// "Fr(0x066f6f85d6f68a85ec10345351a23a3aaf07f38af8c952a7bceca70bd2af7ad5)"
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// );
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// assert_eq!(
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// cons.m[cons.m.len() - 1][0][0].to_string(),
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// "Fr(0x0190f922d97c8a7dcf0a142a3be27749d1c64bc22f1c556aaa24925d158cac56)"
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// );
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// }
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#[test]
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fn test_hash() {
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let b0: Fr = Fr::from_str("0").unwrap();
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let b1: Fr = Fr::from_str("1").unwrap();
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let b2: Fr = Fr::from_str("2").unwrap();
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let b3: Fr = Fr::from_str("3").unwrap();
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let b4: Fr = Fr::from_str("4").unwrap();
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let b5: Fr = Fr::from_str("5").unwrap();
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let b6: Fr = Fr::from_str("6").unwrap();
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let b7: Fr = Fr::from_str("7").unwrap();
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let b8: Fr = Fr::from_str("8").unwrap();
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let b9: Fr = Fr::from_str("9").unwrap();
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let b10: Fr = Fr::from_str("10").unwrap();
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let b11: Fr = Fr::from_str("11").unwrap();
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let b12: Fr = Fr::from_str("12").unwrap();
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let b13: Fr = Fr::from_str("13").unwrap();
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let b14: Fr = Fr::from_str("14").unwrap();
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let b15: Fr = Fr::from_str("15").unwrap();
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let b16: Fr = Fr::from_str("16").unwrap();
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let poseidon = Poseidon::new();
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let big_arr: Vec<Fr> = vec![b1];
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// let mut big_arr: Vec<Fr> = Vec::new();
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// big_arr.push(b1.clone());
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x29176100eaa962bdc1fe6c654d6a3c130e96a4d1168b33848b897dc502820133)" // "18586133768512220936620570745912940619677854269274689475585506675881198879027"
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);
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let big_arr: Vec<Fr> = vec![b1, b2];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x115cc0f5e7d690413df64c6b9662e9cf2a3617f2743245519e19607a4417189a)" // "7853200120776062878684798364095072458815029376092732009249414926327459813530"
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);
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let big_arr: Vec<Fr> = vec![b1, b2, b0, b0, b0];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x024058dd1e168f34bac462b6fffe58fd69982807e9884c1c6148182319cee427)" // "1018317224307729531995786483840663576608797660851238720571059489595066344487"
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);
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let big_arr: Vec<Fr> = vec![b1, b2, b0, b0, b0, b0];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x21e82f465e00a15965e97a44fe3c30f3bf5279d8bf37d4e65765b6c2550f42a1)" // "15336558801450556532856248569924170992202208561737609669134139141992924267169"
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);
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let big_arr: Vec<Fr> = vec![b3, b4, b0, b0, b0];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x0cd93f1bab9e8c9166ef00f2a1b0e1d66d6a4145e596abe0526247747cc71214)" // "5811595552068139067952687508729883632420015185677766880877743348592482390548"
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);
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let big_arr: Vec<Fr> = vec![b3, b4, b0, b0, b0, b0];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x1b1caddfc5ea47e09bb445a7447eb9694b8d1b75a97fff58e884398c6b22825a)" // "12263118664590987767234828103155242843640892839966517009184493198782366909018"
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);
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let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x2d1a03850084442813c8ebf094dea47538490a68b05f2239134a4cca2f6302e1)" // "20400040500897583745843009878988256314335038853985262692600694741116813247201"
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);
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let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x1278779aaafc5ca58bf573151005830cdb4683fb26591c85a7464d4f0e527776)", // "8354478399926161176778659061636406690034081872658507739535256090879947077494"
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);
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let big_arr: Vec<Fr> = vec![b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, b0, b0, b0, b0];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x0c3fbfb4d3f583df4124b4b3ac94ca3a0a1948a89fef727204d89de1c4d35693)", // "5540388656744764564518487011617040650780060800286365721923524861648744699539"
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);
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let big_arr: Vec<Fr> = vec![
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b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, b0, b0, b0, b0, b0, b0,
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];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x1a456f8563b98c9649877f38b7e36534b241c29d457d307c481cbd12b69bb721)", // "11882816200654282475720830292386643970958445617880627439994635298904836126497"
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);
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let big_arr: Vec<Fr> = vec![
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b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16,
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];
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let h = poseidon.hash(big_arr).unwrap();
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assert_eq!(
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h.to_string(),
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"Fr(0x16159a551cbb66108281a48099fff949ae08afd7f1f2ec06de2ffb96b919b765)", // "9989051620750914585850546081941653841776809718687451684622678807385399211877"
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);
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}
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#[test]
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fn test_wrong_inputs() {
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let b0: Fr = Fr::from_str("0").unwrap();
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let b1: Fr = Fr::from_str("1").unwrap();
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let b2: Fr = Fr::from_str("2").unwrap();
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let poseidon = Poseidon::new();
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let big_arr: Vec<Fr> = vec![
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b1, b2, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0, b0,
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];
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poseidon.hash(big_arr).expect_err("Wrong inputs length");
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}
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}
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