I am trying to implement digital signature in PDF with PHP.
Implementation steps are:
- Ask user to upload PDF that needs to be signed
- Validate user with their Unique identifier
- API process data to generate DSC and responds with document signature digested value as Pkcs7 in xml format (Third party)
- Embed pkcs7 in PDF (need help in this)
I have checked TCPDF library but it does not explain on how to attach Pkcs7 in PDF.
I am trying to find something like Java bouncycastle library for PHP.