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(Tcl) Sign PDF with Invisible SignatureSee more PDF Signatures ExamplesDemonstrates how to sign a PDF with an invisible signature. Note: This example requires Chilkat v9.5.0.85 or greater.
load ./chilkat.dll # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. set pdf [new_CkPdf] # Load a PDF to be signed. # The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf set success [CkPdf_LoadFile $pdf "qa_data/pdf/hello.pdf"] if {$success == 0} then { puts [CkPdf_lastErrorText $pdf] delete_CkPdf $pdf exit } # Indicate that the signature will be invisible. set json [new_CkJsonObject] CkJsonObject_UpdateBool $json "invisibleSignature" 1 # Load the signing certificate. (Use your own certificate.) set cert [new_CkCert] set success [CkCert_LoadPfxFile $cert "qa_data/pfx/myPdfSigningCert.pfx" "secret"] if {$success == 0} then { puts [CkCert_lastErrorText $cert] delete_CkPdf $pdf delete_CkJsonObject $json delete_CkCert $cert exit } # Tell the pdf object to use the certificate for signing. set success [CkPdf_SetSigningCert $pdf $cert] if {$success == 0} then { puts [CkPdf_lastErrorText $pdf] delete_CkPdf $pdf delete_CkJsonObject $json delete_CkCert $cert exit } set success [CkPdf_SignPdf $pdf $json "qa_output/hello_signed.pdf"] if {$success == 0} then { puts [CkPdf_lastErrorText $pdf] delete_CkPdf $pdf delete_CkJsonObject $json delete_CkCert $cert exit } puts "PDF successfully signed with an invisible signature." # An invisible signature has no appearance within the PDF document itself, # but Adobe Acrobat will indicate the document is signed in a toolbar, as shown here: |
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