Function EVP_KEM_encap 

pub unsafe extern "C" fn EVP_KEM_encap(
    kem: *const EVP_KEM,
    out_ciphertext: *mut u8,
    ciphertext_len: usize,
    out_secret: *mut u8,
    secret_len: usize,
    peer_key: *const EVP_PKEY,
) -> c_int