PdfFileSignature Class

• PDF Signing
• PDF Certification
• Signature Management
• Signature Verification
• Signature Information
• Signature Integrity Checks
• Revision & Permissions
• Signature Extraction
• Usage Rights Management

Preparing PDF Digital Signature Helpers

Before applying a digital signature to a PDF, it’s a best practice to set up a group of reusable helper functions. These functions encapsulate common tasks—like initializing the signature handler, defining the signature’s visual placement, and configuring certificate-based signing—so your main signing logic stays clean, consistent, and easy to maintain.

What This Setup Achieves

This helper layer prepares everything needed for a smooth signing workflow:

• Initializes a PdfFileSignature object and binds it to a document
• Defines where the signature will appear on the page
• Loads and applies a signing certificate
• Creates a reusable PKCS#7 signature object with metadata
• Customizes how the signature looks visually

import aspose.pdf as ap
import aspose.pdf.facades as pdf_facades
import aspose.pydrawing as apd


DEFAULT_CERTIFICATE_PASSWORD = "Aspose2021"
DEFAULT_SIGNATURE_NAME = "Signature1"


def create_pdf_file_signature(infile):
    pdf_signature = pdf_facades.PdfFileSignature()
    pdf_signature.bind_pdf(infile)
    return pdf_signature


def create_signature_rectangle():
    return apd.Rectangle(10, 10, 200, 60)


def configure_signature_certificate(
    pdf_signature, certificate_path, certificate_password=DEFAULT_CERTIFICATE_PASSWORD
):
    pdf_signature.set_certificate(certificate_path, certificate_password)


def create_pkcs7_signature(
    certificate_path, certificate_password=DEFAULT_CERTIFICATE_PASSWORD
):
    signature = ap.forms.PKCS7(certificate_path, certificate_password)
    signature.reason = "Document approval"
    signature.contact_info = "[e-mail]"
    signature.location = "New York, USA"
    signature.authority = "Aspose.PDF Example"
    return signature


def create_custom_signature_appearance():
    appearance = ap.forms.SignatureCustomAppearance()
    appearance.font_family_name = "Arial"
    appearance.font_size = 10
    appearance.show_contact_info = True
    appearance.show_location = True
    appearance.show_reason = True
    return appearance