(Visual Basic 6.0) Create XAdES using Smart Card or USB Token

Demonstrates how to create an XAdES signed XML document using a certificate located on a smartcard or USB token.

Note: This example requires Chilkat v9.5.0.75 or greater. Also, at the time of this writing this example is restricted to the Windows operating system.

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

' ----------------------------------------------------------------------
' IMPORTANT: This generated example requires Chilkat v9.5.0.75 or later.
' Contact support@chilkatsoft.com for a pre-release.
' ----------------------------------------------------------------------

' Load the XML to be signed.
Dim xmlToSign As New ChilkatXml
Dim success As Long
success = xmlToSign.LoadXmlFile("qa_data/fattura_electronica/docToSign.xml")
If (success <> 1) Then
    Debug.Print xmlToSign.LastErrorText
    Exit Sub
End If

Dim gen As New ChilkatXmlDSigGen

gen.SigLocation = "p:FatturaElettronica"
gen.SigId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504"
gen.SigNamespacePrefix = "ds"
gen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
gen.SigValueId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue"
gen.SignedInfoCanonAlg = "C14N"
gen.SignedInfoDigestMethod = "sha256"

' Create an Object to be added to the Signature.
' Note: Chilkat will automatically populate the strings indicated by "TO BE GENERATED BY CHILKAT" with actual/correct values
' when the XML is signed.
Dim object1 As New ChilkatXml
object1.Tag = "xades:QualifyingProperties"
success = object1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#")
success = object1.AddAttribute("xmlns:xades141","http://uri.etsi.org/01903/v1.4.1#")
success = object1.AddAttribute("Target","#xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504")
success = object1.UpdateAttrAt("xades:SignedProperties",1,"Id","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime","TO BE GENERATED BY CHILKAT"
success = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod",1,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber","TO BE GENERATED BY CHILKAT"

success = gen.AddObject("",object1.GetXml(),"","")

' -------- Reference 1 --------
gen.KeyInfoId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo"
success = gen.AddSameDocRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo","sha256","","","")

' -------- Reference 2 --------
success = gen.AddSameDocRef("","sha256","","","")
success = gen.SetRefIdAttr("","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-ref0")

' -------- Reference 3 --------
success = gen.AddObjectRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops","sha256","","","http://uri.etsi.org/01903#SignedProperties")

' ----------------------------------------------------------------
'  Load a certificate that has been pre-installed on the Windows system
'  This includes certificates on smartcards and USB tokens
Dim cert As New ChilkatCert

'  You may provide the PIN here..
cert.SmartCardPin = "000000"

' Load the certificate on the smartcard currently in the reader (or on the USB token).
' Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
' See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
success = cert.LoadFromSmartcard("")
If (success <> 1) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

success = gen.SetX509Cert(cert,1)
gen.KeyInfoType = "X509Data"
gen.X509Type = "Certificate"

' Load XML to be signed...
Dim sbXml As New ChilkatStringBuilder
success = xmlToSign.GetXmlSb(sbXml)

gen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform"

' Sign the XML...
success = gen.CreateXmlDSigSb(sbXml)
If (success <> 1) Then
    Debug.Print gen.LastErrorText
    Exit Sub
End If

' Save the signed XMl to a file.
success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",0)

Debug.Print sbXml.GetAsString()

' ----------------------------------------
' Verify the signature we just produced...
Dim verifier As New ChilkatXmlDSig
success = verifier.LoadSignatureSb(sbXml)
If (success <> 1) Then
    Debug.Print verifier.LastErrorText
    Exit Sub
End If

Dim verified As Long
verified = verifier.VerifySignature(1)
If (verified <> 1) Then
    Debug.Print verifier.LastErrorText
    Exit Sub
End If

Debug.Print "This signature was successfully verified."