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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/>. use crate::{errors::PRFError, traits::PRF}; use blake2::Blake2s as blake2s; use digest::Digest; #[derive(Clone)] pub struct Blake2s; impl PRF for Blake2s { type Input = [u8; 32]; type Output = [u8; 32]; type Seed = [u8; 32]; fn evaluate(seed: &Self::Seed, input: &Self::Input) -> Result<Self::Output, PRFError> { let eval_time = start_timer!(|| "Blake2s::evaluate"); let mut h = blake2s::new(); h.update(seed.as_ref()); h.update(input.as_ref()); let mut result = [0u8; 32]; result.copy_from_slice(&h.finalize()); end_timer!(eval_time); Ok(result) } }