Function dusk_schnorr::gadgets::double_key_verify

pub fn double_key_verify(
    composer: &mut TurboComposer, 
    u: Witness, 
    r: WitnessPoint, 
    r_p: WitnessPoint, 
    k: WitnessPoint, 
    k_p: WitnessPoint, 
    m: Witness
)

Assert the correctness of the schnorr proof without using the secret key as witness.