How to set up automatic signing of a docx file with an EDS in CENTOS?

Question

PHP

Please tell me if there are free libraries for signing WORD documents in PHP (analogue of PHPdocX), or maybe you know the option to make it a program in CENTOS?
The main criterion is that the signature be embedded in the document (not as a separate .sig file).
I would be grateful for any information on this topic.

Answer 1

As far as I know, cryptopro in Russia is used to sign documents (it implements certified signature algorithms), it must be installed (including a license if necessary), then find out the command for signing files, call this command from php using exec, shell_exec
Universal option next.
1. Select the signature algorithm and method
2. Find a software that implements your wishes under Linux
3. Install the software
4. Call the file signing command from php using exec, shell_exec