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: ProjectiveArithmetic,
    D: FixedOutput<OutputSize = C::FieldSize> + BlockInput + Clone + Default + Reset + Update,
    FieldBytes<C>: From<Scalar<C>> + for<'r> From<&'r Scalar<C>>,
    Scalar<C>: PrimeField<Repr = FieldBytes<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.