Function sequoia_octopus_librnp::op_encrypt::rnp_op_encrypt_add_signature

#[no_mangle]
pub unsafe extern "C" fn rnp_op_encrypt_add_signature(
    op: *mut RnpOpEncrypt<'_>,
    key: *const RnpKey,
    sig: *mut *mut c_void
) -> RnpResult