Struct ark_ff::fields::field_hashers::DefaultFieldHasher

pub struct DefaultFieldHasher<H: Default + DynDigest + Clone, const SEC_PARAM: usize = 128> { /* private fields */ }

This field hasher constructs a Hash-To-Field based on a fixed-output hash function, like SHA2, SHA3 or Blake2. The implementation aims to follow the specification in Hashing to Elliptic Curves (draft).

Examples

use ark_ff::fields::field_hashers::{DefaultFieldHasher, HashToField};
use ark_test_curves::bls12_381::Fq;
use sha2::Sha256;

let hasher = <DefaultFieldHasher<Sha256> as HashToField<Fq>>::new(&[1, 2, 3]);
let field_elements: Vec<Fq> = hasher.hash_to_field(b"Hello, World!", 2);

assert_eq!(field_elements.len(), 2);

Trait Implementations

impl<F: Field, H: Default + DynDigest + Clone, const SEC_PARAM: usize> HashToField<F> for DefaultFieldHasher<H, SEC_PARAM>

fn new(dst: &[u8]) -> Self

Initialises a new hash-to-field helper struct.

fn hash_to_field(&self, message: &[u8], count: usize) -> Vec<F>

Hash an arbitrary msg to #count elements from field F.