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Go / Guides / Sign a document
To sign an existing approval signature field in a PDF Document:
doc := NewPDFDoc(docpath) // Retrieve the unsigned approval signature field. foundApprovalField := doc.GetField(inApprovalFieldName) foundApprovalSignatureDigsigField := NewDigitalSignatureField(foundApprovalField) // (OPTIONAL) Add more information to the signature dictionary. foundApprovalSignatureDigsigField.SetLocation("Vancouver, BC") foundApprovalSignatureDigsigField.SetReason("Document approval.") foundApprovalSignatureDigsigField.SetContactInfo("www.pdftron.com") // (OPTIONAL) Add an appearance to the signature field. img := ImageCreate(doc.GetSDFDoc(), inAppearanceImgPath) foundApprovalSignatureWidget := NewSignatureWidget(foundApprovalField.GetSDFObj()) foundApprovalSignatureWidget.CreateSignatureAppearance(img) // Prepare the signature and signature handler for signing. foundApprovalSignatureDigsigField.SignOnNextSave(inPrivateKeyFilePath, inKeyfilePassword) // The actual approval signing will be done during the following incremental save operation. doc.Save(inOutpath, uint(SDFDocE_incremental))
Digitally sign PDF files
Full code sample which demonstrates using the digital signature API to digitally sign and/or certify PDF documents.
The Apryse 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 Apryse.com.
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