(Lianja) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loPdf = createobject("CkPdf")

// Load a PDF that has cryptographic signatures to be validated
llSuccess = loPdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    return
endif

// Each time we verify a signature, information about the signature is written into
// sigInfo (replacing whatever sigInfo previously contained).
loSigInfo = createobject("CkJsonObject")

// Iterate over each signature and validate each.
lnNumSignatures = loPdf.NumSignatures
llValidated = .F.
loCert = createobject("CkCert")
i = 0
do while i < lnNumSignatures
    llValidated = loPdf.VerifySignature(i,loSigInfo)
    ? "Signature " + str(i) + " validated: " + str(llValidated)

    // The GetSignerCert method was added in Chilkat v9.5.0.87
    // After calling VerifySignature, you can get the signer certificate by calling
    // GetSignerCert with the same index. 
    llSuccess = loPdf.GetSignerCert(i,loCert)
    if (llSuccess <> .F.) then
        ? "PDF signer certificate: " + loCert.SubjectDN
    endif

    i = i + 1
enddo

? "Finished."


release loPdf
release loSigInfo
release loCert