Some test text!
To sign an existing approval signature field in a PDF Document:
PDFDoc doc = new PDFDoc(docpath); // Retrieve the unsigned approval signature field. Field found_approval_field = doc.getField(approval_field_name); DigitalSignatureField approval_digsig_field = new DigitalSignatureField(found_approval_field); // (OPTIONAL) Add more information to the signature dictionary. approval_digsig_field.setLocation("Vancouver, BC"); approval_digsig_field.setReason("Document approval."); approval_digsig_field.setContactInfo("www.pdftron.com"); // (OPTIONAL) Add an appearance to the signature field. Image img = Image.create(doc, appearance_img_path); SignatureWidget approval_signature_widget = new SignatureWidget(found_approval_field.getSDFObj()); approval_signature_widget.createSignatureAppearance(img); // Prepare the signature and signature handler for signing. approval_digsig_field.signOnNextSave(private_key_file_path, keyfile_password); // The actual approval signing will be done during the following incremental save operation. doc.save(outpath, SDFDoc.SaveMode.INCREMENTAL, null);
Digitally sign PDF files
Full code sample which demonstrates using the digital signature API to digitally sign and/or certify PDF documents.
The PDFTron SDK enables approval signatures in PDF documents using a Digital Certificate, in accordance with the latest PDF specification. By leveraging public key infrastructure (PKI) technology, with a certificate issued by a trusted certificate authority (CA), a signer can use a certificate-based digital ID to guarantee the authenticity of a signature. Placement of a digital signature using a certificate can also guarantee that a document was not modified since the signature was placed, ensuring the authenticity of the document.
Above is an example of a document containing a certified signature, guaranteed by a certificate generated by PDFTron.com.
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