(Xojo Plugin) 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.

Dim pdf As New Chilkat.Pdf

// Load a PDF that has cryptographic signatures to be validated
Dim success As Boolean
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

// Each time we verify a signature, information about the signature is written into
// sigInfo (replacing whatever sigInfo previously contained).
Dim sigInfo As New Chilkat.JsonObject

// Iterate over each signature and validate each.
Dim numSignatures As Int32
numSignatures = pdf.NumSignatures
Dim validated As Boolean
validated = False
Dim cert As New Chilkat.Cert
Dim i As Int32
i = 0
While i < numSignatures
    validated = pdf.VerifySignature(i,sigInfo)
    System.DebugLog("Signature " + Str(i) + " validated: " + Str(validated))

    // 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. 
    success = pdf.GetSignerCert(i,cert)
    If (success <> False) Then
        System.DebugLog("PDF signer certificate: " + cert.SubjectDN)
    End If

    i = i + 1
Wend

System.DebugLog("Finished.")