Xojo Plugin

Sign PDF with Timestamp from TSA (Timestamp Server Authority)

See more PDF Signatures Examples

This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). Xojo Plugin

Dim success As Boolean
success = False

// 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 to be signed.
// The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success = pdf.LoadFile("qa_data/pdf/hello.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

// Options for signing are specified in JSON.
Dim json As New Chilkat.JsonObject

// In most cases, the signingCertificateV2 and signingTime attributes are required.
success = json.UpdateInt("signingCertificateV2",1)
success = json.UpdateInt("signingTime",1)

// Tell Chilkat to create an LTV-enabled (long term validation) signature.
// See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
success = json.UpdateBool("ltvOcsp",True)

// Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
// in the CMS signature's authentication attributes
success = json.UpdateBool("timestampToken.enabled",True)

// In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
success = json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")

// If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
success = json.UpdateString("timestampToken.tsaUsername","the_tsa_username")
success = json.UpdateString("timestampToken.tsaPassword","the_tsa_password")

// When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
// This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
// has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
success = json.UpdateBool("timestampToken.requestTsaCert",True)

// Define the appearance of the signature.
success = json.UpdateInt("page",1)
success = json.UpdateString("appearance.y","top")
success = json.UpdateString("appearance.x","left")
success = json.UpdateString("appearance.fontScale","10.0")
success = json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
success = json.UpdateString("appearance.text[1]","current_dt")
success = json.UpdateString("appearance.text[2]","This is an LTV-enabled signature with a TSA timestamp.")

// Load the signing certificate. (Use your own certificate.)
Dim cert As New Chilkat.Cert
success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfxPassword")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Tell the pdf object to use the certificate for signing.
success = pdf.SetSigningCert(cert)
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

success = pdf.SignPdf(json,"qa_output/hello_ltv_signed_with_timestamp.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

System.DebugLog("The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.")

// If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
// and contains an embedded timestamp:
// (image:https://example-code.com/images/ltv_signature_with_timestamp.jpg/endImage)