How can I make openssl doesn't add a signed attribute "signingTime" when I sign a cms/cades singnature?

[Antonio Iacono]

Hello Shiyao,

the signing time attribute has always been considered mandatory or in
any case useful and only with CAdES optional and even with PAdES not
allowed.
A request similar to yours has already been received (see
https://mta.openssl.org/pipermail/openssl-users/2017-February/005240.html)
I also believe that CMS API flag would be useful that allows
suppression of the signing-time attribute.

Antonio

On Wed, Mar 13, 2019 at 12:57 PM shiyao_liu at foxitsoftware.cn
<shiyao_liu at foxitsoftware.cn> wrote:
>
> Hello everyone,
>
>     I am working on a project about how to use openssl libs to implement a PAdES(whitch is based on CAdES) signature because I saw that the master branch of openssl has supported CAdES-BES signature. But now there is a problem I don't know how to solve it. So I am asking for some help.
>     According to the PAdES reference, signing-time attribute in CMS signature shall not be present in a PAdES signature. In openssl libs, signing-time attribute is set in the function CMS_SignerInfo_sign. But I can't find a way to control it not to set  signing-time attribute. So I want to know if there is a way to not to set signing-time attribute or delete this attribute without changing the openssl source code.
>
> Regards,
> Shiyao Liu
>
> ________________________________
> shiyao_liu at foxitsoftware.cn