(Lianja) Sign PDF using ARSS (Aruba Remote Signing Service)

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Demonstrates how to digitally sign a PDF using the Aruba Remote Signing Service (ARSS). The example loads a local PDF and certificate, configures the ARSS cloud signer credentials, specifies the OTP authentication type with typeOtpAuth, and creates an LTV-enabled signed PDF where the private key remains protected on the Aruba signing server.

Note: This example requires Chilkat v11.5.0 or greater.

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llSuccess = .F.

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

loPdf = createobject("CkPdf")

// Load the PDF that will be digitally signed.
llSuccess = loPdf.LoadFile("qa_data/pdf/hello.pdf")
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    return
endif

// Signing options are specified in a JSON object.
loJson = createobject("CkJsonObject")

// Enable LTV (Long-Term Validation).
// When ltvOcsp is true, OCSP validation information is embedded in the PDF
// so that signature validation can continue to succeed in the future,
// even if the original OCSP responder is no longer available.
loJson.UpdateBool("ltvOcsp",.T.)

// Specify the visual appearance of the signature on the PDF page.
loJson.UpdateInt("page",1)
loJson.UpdateString("appearance.y","top")
loJson.UpdateString("appearance.x","left")
loJson.UpdateString("appearance.fontScale","10.0")

// Text lines displayed in the visible signature appearance.
// Special values such as "cert_cn" and "current_dt" are replaced
// with the certificate common name and current date/time.
loJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
loJson.UpdateString("appearance.text[1]","current_dt")
loJson.UpdateString("appearance.text[2]","This is an LTV-enabled signature.")

// Load the signing certificate.
// 
// The private key is NOT stored locally.  Instead, the private key is
// stored and protected on the Aruba Remote Signing Service (ARSS).
// 
// Even though the signing operation will occur remotely, Chilkat still
// needs the corresponding public certificate locally so that it can
// construct the CMS/PAdES signature and embed the certificate chain
// in the signed PDF.
loCert = createobject("CkCert")
llSuccess = loCert.LoadFromFile("qa_data/certs/myCert.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loPdf
    release loJson
    release loCert
    return
endif

// Configure Aruba Remote Signing Service (ARSS) credentials.
// 
// When SetCloudSigner is called, Chilkat is instructed to perform
// cryptographic signing operations through the ARSS web service.
// The PDF is assembled locally, but the actual RSA signature operation
// is performed remotely using the private key held by Aruba.
loJsonArss = createobject("CkJsonObject")

// Required.  Indicates that the cloud signing provider is ARSS.
loJsonArss.UpdateString("service","ARSS")

// The ARSS certificate identifier (for example, "AS0").
// This identifies which remote certificate/private key pair should be used.
// The remote certificate should correspond to the certificate loaded above.
loJsonArss.UpdateString("certID","YOUR_ARSS_CERT_ID")

// OTP password associated with the Aruba remote-signing account.
// Depending on the ARSS configuration, an OTP may be required to
// authorize each signing operation.
loJsonArss.UpdateString("otpPwd","YOUR_OTP_PWD")

// Specifies the OTP authentication environment.
// 
// Common values are:
//   "demoprod" - Demo/Test environment
//   "prod"     - Production environment
// 
// This value is sent to the ARSS service and determines how the OTP
// authentication is validated.  The correct value depends on the type
// of Aruba account and environment that has been provisioned.
// 
// If signing fails with an authentication-related error, verify that
// the typeOtpAuth value matches the environment associated with the
// ARSS account credentials being used.
loJsonArss.UpdateString("typeOtpAuth","demoprod")

// ARSS account username.
loJsonArss.UpdateString("user","YOUR_ARSS_USERNAME")

// ARSS account password.
loJsonArss.UpdateString("userPWD","YOUR_ARSS_PASSWORD")

// Beginning with Chilkat v11.5.0, the ARSS endpoint can be explicitly
// specified.  This allows the application to target a particular
// Aruba signing service endpoint when required.
loJsonArss.UpdateString("endpoint","https://app1.firma-remota.it/ArubaSignerService/webresources/signerservice")

llSuccess = loCert.SetCloudSigner(loJsonArss)
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loPdf
    release loJson
    release loCert
    release loJsonArss
    return
endif

// Associate the certificate with the PDF object.
// All subsequent signing operations will use this certificate.
llSuccess = loPdf.SetSigningCert(loCert)
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    release loJson
    release loCert
    release loJsonArss
    return
endif

// Create the signed PDF.
// 
// Chilkat performs all PDF processing locally.  When the time comes
// to generate the cryptographic signature value, Chilkat sends the
// hash to ARSS, which signs it using the remote private key and returns
// the signature.  The private key never leaves the Aruba service.
llSuccess = loPdf.SignPdf(loJson,"qa_output/hello_ltv_signed.pdf")
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    release loJson
    release loCert
    release loJsonArss
    return
endif

? "The PDF has been successfully cryptographically signed with long-term validation."


release loPdf
release loJson
release loCert
release loJsonArss