iText7 and C# - X509Certificate2Signature port can't sign using RSAcng - rsa

I'm trying to sign a PDF using iText7 the way I did with iText5:
I took the Cert from Windows Personal Store.
I create an IExternalSignature based on the Cert.
I found that X509Certificate2Signature class is not present in iText7.
Because of that I've ported it, however when the Signer method SignDetached is invoked I get that nasty error telling that the classic RSA algorithm is not available because now it is a bit different (RSAcng).
Is there a workaround?
For sure, there must be a reason why the class was not ported to iText7 that I can't understand.
Thanks.

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