Function ecdsa::rfc6979::generate_k

pub fn generate_k<C, D>(
    secret_scalar: &NonZeroScalar<C>, 
    msg_digest: D, 
    additional_data: &[u8]
) -> Zeroizing<NonZeroScalar<C>> where
    C: Curve + ProjectiveArithmetic,
    D: FixedOutput<OutputSize = FieldSize<C>> + BlockInput + Clone + Default + Reset + Update,
    Scalar<C>: FromDigest<C> + Invert<Output = Scalar<C>> + Zeroize, 

This is supported on crate feature sign only.

Generate ephemeral scalar k from the secret scalar and a digest of the input message.