How to check file and signature file?

Question

PHP

Good afternoon. Faced with the task:
2 files come from the front (File.xml and its signed copy .p7s).
You need to validate these files.
How can I check this p7s file?
With the first xml it is not difficult to extract the data there, but how to extract it from p7s?

Answer 1

Look in this post. How to check PKCS7 signature in PHP?