Visual FoxPro

Sign PDF using ARSS (Aruba Remote Signing Service)

See more Signing in the Cloud Examples

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson
LOCAL loCert
LOCAL loJsonArss

lnSuccess = 0

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

loPdf = CreateObject('Chilkat.Pdf')

* Load the PDF that will be digitally signed.
lnSuccess = loPdf.LoadFile("qa_data/pdf/hello.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

* Signing options are specified in a JSON object.
loJson = CreateObject('Chilkat.JsonObject')

* 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",1)

* 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('Chilkat.Cert')
lnSuccess = loCert.LoadFromFile("qa_data/certs/myCert.cer")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    CANCEL
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('Chilkat.JsonObject')

* 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")

lnSuccess = loCert.SetCloudSigner(loJsonArss)
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    RELEASE loJsonArss
    CANCEL
ENDIF

* Associate the certificate with the PDF object.
* All subsequent signing operations will use this certificate.
lnSuccess = loPdf.SetSigningCert(loCert)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    RELEASE loJsonArss
    CANCEL
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.
lnSuccess = loPdf.SignPdf(loJson,"qa_output/hello_ltv_signed.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    RELEASE loJsonArss
    CANCEL
ENDIF

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

RELEASE loPdf
RELEASE loJson
RELEASE loCert
RELEASE loJsonArss