Is it possible to sign Pdfs reports in the ICP BRASIL 15 standard with the PHP language?

Question

The client wants the pdfs reports on my system to be digitally signed with ICP standard BRASIL 15.

Question 1:

PHP alone with the function openssl-pkcs7-sign signed ICP Brazil 15 ?

Second question:

I noticed some digital signature functions with PHP. For example: the function openssl-pkcs7-signbut many consultants say that PHP alone does not sign ICP Brazil but its standard is the one of RSA.

Could someone help me ? Thank you very much!