Enum ark_ff::fields::SqrtPrecomputation

#[non_exhaustive]
pub enum SqrtPrecomputation<F: Field> {
    TonelliShanks {
        two_adicity: u32,
        quadratic_nonresidue_to_trace: F,
        trace_of_modulus_minus_one_div_two: &'static [u64],
    },
    Case3Mod4 {
        modulus_plus_one_div_four: &'static [u64],
    },
}

Precomputation that makes computing square roots faster A particular variant should only be instantiated if the modulus satisfies the corresponding condition.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

TonelliShanks

Fields

two_adicity: u32

quadratic_nonresidue_to_trace: F

trace_of_modulus_minus_one_div_two: &'static [u64]

Case3Mod4

Fields

modulus_plus_one_div_four: &'static [u64]

To be used when the modulus is 3 mod 4.

Implementations

impl<F: Field> SqrtPrecomputation<F>

pub fn sqrt(&self, elem: &F) -> Option<F>