Upload P7M and signed PDF files

Custom fields set provides a base class called CustomSignedFileField that via FileSignatureValidator library checks if an upload attachment is digitally signed.

Also, with get_cleaned_signature_params() method, it returns the sign details

• Signature Validation

• Signing Time

• Signer full Distinguished Name

P7M file fields are built by CustomSignedP7MField(CustomSignedFileField) class.

Signed PDF file fields are built by CustomSignedPdfField(CustomSignedFileField) class.