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Hello,

Thanks for sending the sample PEM file.

The PEM file only contains a certificate section:

-----BEGIN CERTIFICATE-----

(...)

-----END CERTIFICATE-----

It doesn't contain a private key. You need to use a PEM file with all contents to be able to sign files. Please check the samples included in the package, which also includes a sample PEM file.

A DER file is a binary encoding file that can be used to store certificates and private keys. phpdocx works with PEM files, maybe you can transform your DER file to PEM:

https://www.ssl.com/guide/pem-der-crt-and-cer-x-509-encodings-and-conversions/

https://www.oreilly.com/library/view/linux-security-cookbook/0596003919/ch04s10.html

Please check the samples included in the package and the documentation available on the following page: https://www.phpdocx.com/documentation/introduction/digital-signature-docx-pdf-PHP

As you can read on this page:

• You need to include the path to your RSA private key in the setPrivateKey() method indicating the password if required (we include here the options associated with a "fake" digital certificate included with the module only for testing purposes).
•  
• The setPrivateKey() method only admits .pem format. If you want to use pfx format you should first transform it to .pem with the transformPfxToPem() method.

You need to use a PEM file to sign documents, not a DER file.

Regards.