Function encapsulate_boxed 

pub fn encapsulate_boxed<R: CryptoRng + RngCore>(
    public_key: &PublicKey<'_>,
    rng: &mut R,
) -> (Ciphertext, SharedSecret<'static>)

Available on crate feature alloc only.

Convenient wrapper around encapsulate that stores the shared secret on the heap and returns it with the 'static lifetime.