Function EVP_KEM_decap 

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