Xbase++

Include the SigningCertificateV2 Authenticated Attribute in CAdES (CMS) Signature

See more CAdES Examples

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

LOCAL nSuccess
LOCAL oCrypt
LOCAL oCert
LOCAL cInFile
LOCAL cP7sFile
LOCAL oJsonSigningAttrs
LOCAL cExtractedToFilePath

nSuccess := 0

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

oCrypt := CreateObject("Chilkat.Crypt2")

oCert := CreateObject("Chilkat.Cert")
nSuccess := oCert:LoadPfxFile("qa_data/pfx/cert_test123.pfx", "test123")
IF (nSuccess != 1)
    ? oCert:LastErrorText
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  Tell the crypt component to use this cert.
nSuccess := oCrypt:SetSigningCert(oCert)
IF (nSuccess != 1)
    ? oCrypt:LastErrorText
    oCrypt:destroy()
    oCert:destroy()
    RETURN
ENDIF

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

oCrypt: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.
cInFile := "qa_data/pdf/sample.pdf"
cP7sFile := "qa_output/sample.pdf.p7s"

oJsonSigningAttrs := CreateObject("Chilkat.JsonObject")
oJsonSigningAttrs:UpdateInt("contentType", 1)
oJsonSigningAttrs:UpdateInt("signingTime", 1)
oJsonSigningAttrs:UpdateInt("messageDigest", 1)

//  This is where we specify for the signingCertificateV2 attribute to be included:
oJsonSigningAttrs:UpdateInt("signingCertificateV2", 1)

oCrypt:SigningAttributes := oJsonSigningAttrs: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:
oCrypt: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.
nSuccess := oCrypt:CreateP7M(cInFile, cP7sFile)
IF (nSuccess == 0)
    ? oCrypt:LastErrorText
    oCrypt:destroy()
    oCert:destroy()
    oJsonSigningAttrs:destroy()
    RETURN
ENDIF

//  Verify the .p7s file and extract the original file from the .p7s. 
cExtractedToFilePath := "qa_output/sample.pdf"
nSuccess := oCrypt:VerifyP7M(cP7sFile, cExtractedToFilePath)
IF (nSuccess == 0)
    ? oCrypt:LastErrorText
    oCrypt:destroy()
    oCert:destroy()
    oJsonSigningAttrs:destroy()
    RETURN
ENDIF

? "Success!"

oCrypt:destroy()
oCert:destroy()
oJsonSigningAttrs:destroy()