Method shifted_powers

poly-commit/src/sonic_pc/data_structures.rs:81–114

Obtain powers for committing to shifted polynomials.

(
        &self,
        degree_bound: impl Into<Option<usize>>,
    )

    /// Obtain powers for committing to shifted polynomials.
    pub fn shifted_powers(
        &self,
        degree_bound: impl Into<Option<usize>>,
    ) -> Option<kzg10::Powers<E>> {
        match (&self.shifted_powers_of_g, &self.shifted_powers_of_gamma_g) {
            (Some(shifted_powers_of_g), Some(shifted_powers_of_gamma_g)) => {
                let max_bound = self
                    .enforced_degree_bounds
                    .as_ref()
                    .unwrap()
                    .last()
                    .unwrap();
                let (bound, powers_range) = if let Some(degree_bound) = degree_bound.into() {
                    assert!(self
                        .enforced_degree_bounds
                        .as_ref()
                        .unwrap()
                        .contains(&degree_bound));
                    (degree_bound, (max_bound - degree_bound)..)
                } else {
                    (*max_bound, 0..)
                };

                let ck = kzg10::Powers {
                    powers_of_g: shifted_powers_of_g[powers_range.clone()].into(),
                    powers_of_gamma_g: shifted_powers_of_gamma_g[&bound].clone().into(),
                };

                Some(ck)
            }

            (_, _) => None,
        }
    }
}

impl<E: Pairing> PCCommitterKey for CommitterKey<E> {