snarkvm_console_algorithms/poseidon/
hash_to_scalar.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> HashToScalar for Poseidon<E, RATE> {
19    type Input = Field<E>;
20    type Output = Scalar<E>;
21
22    /// Returns a scalar from hashing the input.
23    /// This method uses truncation (up to data bits) to project onto the scalar field.
24    #[inline]
25    fn hash_to_scalar(&self, input: &[Self::Input]) -> Result<Self::Output> {
26        // Hash the input to the base field.
27        let output = self.hash(input)?;
28        // Convert the output to the scalar field,
29        // truncating to the size in data bits (1 bit less than the MODULUS) of the scalar.
30        Ok(Self::Output::from_field_lossy(&output))
31    }
32}

snarkvm_console_algorithms/poseidon/hash_to_scalar.rs

snarkvm_console_algorithms/poseidon/
hash_to_scalar.rs