How to create a signature in doc file

Dear Sir,
I open a doc file in MS words and draw a rectangle, Now I want to use aspose to create a digital signature in the correct position of this rectangle. How to do that?. If I convert a signed doc into pdf then if the pdf has the signature or not.
by the way what is the “morzal.pfx” and how to download this file.
Thanks in advance.

@dvcuong150181

We suggest you please read the following article about working with digital signatures.

The . pfx file is in a PKCS#12 format that contains the SSL certificate (public keys) and the corresponding private key. You can use CertificateHolder.Create method with this type of file to create CertificateHolder object using path to PKCS12 store and its password.