C++ How to parse Subject Directory Attributes Extension?

[Matthias Ballreich <Matthias.Ballreich@xxxxxxxxxx>]

Hi there,

can anyone tell me how to parse a the Subject Directory Attribute Extension of a X509-Certificate in C++ with OpenSSL? I don't found any documentation or piece of code in the Github Repo of OpenSSL.

I read the Extension this way:

int loc = X509_get_ext_by_NID(cert, NID_subject_directory_attributes, -1);
X509_EXTENSION *ex = X509_get_ext(cert, loc);

But i stuck on how to continue and get the TypeValue-Stuff.
Would be very helpful if someone can help me.

thanks and best regards
Matthias

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