INNER CODE UNIT · Rust

compute_lagrange_coefficient

ZcashFoundation/frost · frost-core/src/lib.rs:295

fn compute_lagrange_coefficient<C: Ciphersuite>(
    x_set: &BTreeSet<Identifier<C>>,
    x: Option<Identifier<C>>,
    x_i: Identifier<C>,
) -> Result<Scalar<C>, Error<C>> {
    if x_set.is_empty() {
        return Err(Error::IncorrectNumberOfIdentifiers);
    }
    let mut num = <<C::Group as Group>::Field>::one();
    let mut den = <<C::Group as Group>::Field>::one();

    let mut x_i_found = false;

    for x_j in x_set.iter() {
        if x_i == *x_j {
            x_i_found = true;
            continue;
        }

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