(PowerBuilder) Sign PDF in the Cloud using AWS KMS

See more Signing in the Cloud Examples

Demonstrates how to sign a PDF using the AWS Key Management Service. The signing of the hash happens in the Cloud on AWS KMS. Everything else involving the updating the PDF to add the signature happens locally within Chilkat.

Note: This example requires Chilkat v9.5.0.96 or greater.

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integer li_rc
oleobject loo_Pdf
integer li_Success
oleobject loo_Json
oleobject loo_Cert
oleobject loo_JsonAwsKms

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

loo_Pdf = create oleobject
// Use "Chilkat_9_5_0.Pdf" for versions of Chilkat < 10.0.0
li_rc = loo_Pdf.ConnectToNewObject("Chilkat.Pdf")
if li_rc < 0 then
    destroy loo_Pdf
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Load a PDF to be signed.
li_Success = loo_Pdf.LoadFile("qa_data/pdf/helloWorld.pdf")
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    return
end if

// Options for signing are specified in JSON.
loo_Json = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

// Optionally create an LTV-enabled signature
loo_Json.UpdateBool("ltvOcsp",1)

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

// Load the certificate used for signing.  The certificate's private key is stored in AWS KMS
// However, we still need the certificate locally (without private key).
loo_Cert = create oleobject
// Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadFromFile("qa_data/certs/myCert.cer")
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_Cert
    return
end if

// Here's a screenshot of our private key AWS KMS:


// To sign using AWS KMS, 
// add the following lines of code to specify your AWS authentication credentials,
// and the ID of the KMS private key.
loo_JsonAwsKms = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_JsonAwsKms.ConnectToNewObject("Chilkat.JsonObject")

// Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
loo_JsonAwsKms.UpdateString("service","aws_kms")
loo_JsonAwsKms.UpdateString("access_key","ACCESS_KEY")
loo_JsonAwsKms.UpdateString("secret_key","SECRET_KEY")
// Make sure to specify the correct region for your case.
loo_JsonAwsKms.UpdateString("region","us-west-2")
// In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
loo_JsonAwsKms.UpdateString("key_id","187012e8-008f-4fc7-b100-5efe6146dff2")

li_Success = loo_Cert.SetCloudSigner(loo_JsonAwsKms)

// Tell the pdf object to use the certificate for signing (and for AWS KMS to do the actual signing of the hash).
li_Success = loo_Pdf.SetSigningCert(loo_Cert)
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_Cert
    destroy loo_JsonAwsKms
    return
end if

// Chilkat will build the signed PDF locally, but will (internally) use AWS KMS
// to do the RSA (or EC) sign hash operation.
li_Success = loo_Pdf.SignPdf(loo_Json,"qa_output/hello_ltv_signed.pdf")
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_Cert
    destroy loo_JsonAwsKms
    return
end if

Write-Debug "PDF Cloud Signing using AWS KMS Successful."


destroy loo_Pdf
destroy loo_Json
destroy loo_Cert
destroy loo_JsonAwsKms