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fiat_shamir_poseidon_sponge.rs
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fiat_shamir_poseidon_sponge.rs
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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the snarkVM library.
// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.
//
// Acknowledgements
//
// This implementation of Poseidon is entirely from Fractal's implementation
// ([COS20]: https://eprint.iacr.org/2019/1076) with small syntax changes.
//
use crate::{fiat_shamir::AlgebraicSponge, Vec};
use snarkvm_algorithms::crypto_hash::{CryptographicSponge, PoseidonDefaultParametersField};
use snarkvm_fields::PrimeField;
use snarkvm_utilities::sync::Arc;
/// The sponge for Poseidon
#[derive(Clone, Debug)]
pub struct PoseidonSponge<F: PrimeField + PoseidonDefaultParametersField> {
/// The actual sponge element
pub sponge: snarkvm_algorithms::crypto_hash::PoseidonSponge<F>,
}
impl<F: PrimeField + PoseidonDefaultParametersField> AlgebraicSponge<F> for PoseidonSponge<F> {
fn new() -> Self {
let params = Arc::new(F::get_default_poseidon_parameters(6, false).unwrap());
let sponge = snarkvm_algorithms::crypto_hash::PoseidonSponge::<F>::new(¶ms);
Self { sponge }
}
fn absorb(&mut self, elems: &[F]) {
self.sponge.absorb(elems)
}
fn squeeze(&mut self, num: usize) -> Vec<F> {
self.sponge.squeeze_field_elements(num)
}
}