INNER CODE UNIT · Rust

from_hex

ZcashFoundation/frost · frost-core/src/lib.rs:270

    fn from_hex<T: AsRef<[u8]>>(hex: T) -> Result<Self, Self::Error> {
        let v: Vec<u8> = FromHex::from_hex(hex).map_err(|_| "invalid hex")?;

        match v.as_slice().try_into() {
            Ok(bytes) => <<C::Group as Group>::Field>::deserialize(&bytes)
                .map(|scalar| Self(scalar))
                .map_err(|_| "malformed scalar encoding"),
            Err(_) => Err("malformed scalar encoding"),
        }
    }
}

/// Generates a lagrange coefficient.
///
/// The Lagrange polynomial for a set of points (x_j, y_j) for 0 <= j <= k
/// is ∑_{i=0}^k y_i.ℓ_i(x), where ℓ_i(x) is the Lagrange basis polynomial:
///
/// ℓ_i(x) = ∏_{0≤j≤k; j≠i} (x - x_j) / (x_i - x_j).

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