(Visual FoxPro) Include the SigningCertificateV2 Authenticated Attribute in CAdES (CMS) Signature

Demonstrates how to include the SigningCertificateV2 authenticated attribute in a CMS (.p7m/.p7s) signature.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loCrypt
LOCAL loCert
LOCAL lnSuccess
LOCAL lcInFile
LOCAL lcP7sFile
LOCAL loJsonSigningAttrs
LOCAL lcExtractedToFilePath

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

* Tell the crypt component to use this cert.
lnSuccess = loCrypt.SetSigningCert(loCert)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

* The CadesEnabled property applies to all methods that create PKCS7 signatures. 
* To create a CAdES-BES signature, set this property equal to true. 
loCrypt.CadesEnabled = 1

loCrypt.HashAlgorithm = "sha256"

* We can sign any type of file, creating a .p7s as output.
* The .p7s contains the signature and also embeds the data of the file that is signed.
lcInFile = "qa_data/pdf/sample.pdf"
lcP7sFile = "qa_output/sample.pdf.p7s"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonSigningAttrs = CreateObject('Chilkat.JsonObject')
loJsonSigningAttrs.UpdateInt("contentType",1)
loJsonSigningAttrs.UpdateInt("signingTime",1)
loJsonSigningAttrs.UpdateInt("messageDigest",1)

* This is where we specify for the signingCertificateV2 attribute to be included:
loJsonSigningAttrs.UpdateInt("signingCertificateV2",1)

loCrypt.SigningAttributes = loJsonSigningAttrs.Emit()

* By default, all the certs in the chain of authentication are included in the signature.
* If desired, we can choose to only include the signing certificate:
loCrypt.IncludeCertChain = 0

* Create the CAdES-BES attached signature, which contains the original data.
* Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
* is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
* is NOT contained within the signature.  We want the data to be contained in the signature, therefore
* we call CreateP7M even though we are naming our output file .p7s.
lnSuccess = loCrypt.CreateP7M(lcInFile,lcP7sFile)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSigningAttrs
    CANCEL
ENDIF

* Verify the .p7s file and extract the original file from the .p7s. 
lcExtractedToFilePath = "qa_output/sample.pdf"
lnSuccess = loCrypt.VerifyP7M(lcP7sFile,lcExtractedToFilePath)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    RELEASE loJsonSigningAttrs
    CANCEL
ENDIF

? "Success!"

RELEASE loCrypt
RELEASE loCert
RELEASE loJsonSigningAttrs