(Go) 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.

    pdf := chilkat.NewPdf()

    // Load a PDF that has cryptographic signatures to be validated
    success := pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        return
    }

    // Each time we verify a signature, information about the signature is written into
    // sigInfo (replacing whatever sigInfo previously contained).
    sigInfo := chilkat.NewJsonObject()

    // Iterate over each signature and validate each.
    numSignatures := pdf.NumSignatures()
    validated := false
    cert := chilkat.NewCert()
    i := 0
    for i < numSignatures {
        validated = pdf.VerifySignature(i,sigInfo)
        fmt.Println("Signature ", i, " validated: ", 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 {
            fmt.Println("PDF signer certificate: ", cert.SubjectDN())
        }

        i = i + 1
    }

    fmt.Println("Finished.")

    pdf.DisposePdf()
    sigInfo.DisposeJsonObject()
    cert.DisposeCert()