pub unsafe extern "C" fn EVP_AEAD_CTX_seal(
    ctx: *const EVP_AEAD_CTX,
    out: *mut u8,
    out_len: *mut usize,
    max_out_len: usize,
    nonce: *const u8,
    nonce_len: usize,
    in_: *const u8,
    in_len: usize,
    ad: *const u8,
    ad_len: usize
) -> c_int