snarkvm_console_algorithms/poseidon/
prf.rs

1// Copyright 2024 Aleo Network Foundation
2// This file is part of the snarkVM library.
3
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at:
7
8// http://www.apache.org/licenses/LICENSE-2.0
9
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15
16use super::*;
17
18impl<E: Environment, const RATE: usize> PRF for Poseidon<E, RATE> {
19    type Input = Field<E>;
20    type Output = Field<E>;
21    type Seed = Field<E>;
22
23    #[inline]
24    fn prf(&self, seed: &Self::Seed, input: &[Self::Input]) -> Result<Self::Output> {
25        // Construct the preimage: seed || input.
26        let mut preimage = Vec::with_capacity(1 + input.len());
27        preimage.push(*seed);
28        preimage.extend_from_slice(input);
29
30        // Hash the preimage to derive the PRF output.
31        self.hash(&preimage)
32    }
33}
snarkvm_console_algorithms/poseidon/prf.rs

snarkvm_console_algorithms/poseidon/
prf.rs
