(Visual Basic 6.0) XAdES using TSA Requiring Client Certificate

See more XML Digital Signatures Examples

Demonstrates how to create an XMLDSig (XAdES) signed document which includes an EncapsulatedTimestamp using a TSA (TimeStamp Authority) server requiring client certificate authentication. One such TSA is https://www3.postsignum.cz/TSS/TSS_crt/

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

Dim success As Long
success = 1

' Load the XML to be signed.  For example, the XML to be signed might contain something like this:

' <?xml version="1.0" encoding="utf-8"?>
' <TransakcniLogSystemu xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://nsess.public.cz/erms_trans/v_01_01" Id="Signature1">
'   <TransLogInfo>
'     <Identifikator>XYZ ABC</Identifikator>
'     <DatumVzniku>2022-12-20T14:39:02.3625922+01:00</DatumVzniku>
'     <DatumCasOd>2022-12-20T14:26:26.88</DatumCasOd>
'     <DatumCasDo>2022-12-20T14:39:02.287</DatumCasDo>
'     <Software>XYZ</Software>
'     <VerzeSoftware>2.0.19.32</VerzeSoftware>
'   </TransLogInfo>
'   <Udalosti>
'     <Udalost>
'       <Poradi>1</Poradi>
' ...

' Load the XML to be signed from a file.
' (XML can be loaded from other source, such as a string variable.)
Dim sbXml As New ChilkatStringBuilder
success = sbXml.LoadFile("xmlToSign.xml","utf-8")

Dim gen As New ChilkatXmlDSigGen

gen.SigLocation = "TransakcniLogSystemu"
gen.SigLocationMod = 0
gen.SigId = "SignatureID-Signature1"
gen.SigNamespacePrefix = "ds"
gen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
gen.SignedInfoCanonAlg = "C14N"
gen.SignedInfoDigestMethod = "sha256"

' Set the KeyInfoId before adding references..
gen.KeyInfoId = "KeyInfoId-Signature-Signature1"

' Create an Object to be added to the Signature.

' Note: Chilkat will automatically fill in the values marked as "TO BE GENERATED BY CHILKAT" at the time of signing.
' The EncapsulatedTimestamp will be automatically generated.

Dim object1 As New ChilkatXml
object1.Tag = "xades:QualifyingProperties"
success = object1.AddAttribute("Target","#Signature1")

success = object1.UpdateAttrAt("xades:SignedProperties",1,"Id","SignedProperties-Signature-Signature1")
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"

' The EncapsulatedTimestamp will be included in the unsigned properties.
success = object1.UpdateAttrAt("xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp",1,"Id","signature-timestamp-5561-8212-3316-5191")
success = object1.UpdateAttrAt("xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|ds:CanonicalizationMethod",1,"Algorithm","http://www.w3.org/2001/10/xml-exc-c14n#")
success = object1.UpdateAttrAt("xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp",1,"Encoding","http://uri.etsi.org/01903/v1.2.2#DER")
object1.UpdateChildContent "xades:UnsignedProperties|xades:UnsignedSignatureProperties|xades:SignatureTimeStamp|xades:EncapsulatedTimeStamp","TO BE GENERATED BY CHILKAT"

success = gen.AddObject("XadesObjectId-Signature1",object1.GetXml(),"","")

' -------- Reference 1 --------
success = gen.AddObjectRef("SignedProperties-Signature-Signature1","sha256","EXCL_C14N","","http://uri.etsi.org/01903#SignedProperties")

' -------- Reference 2 --------
success = gen.AddSameDocRef("KeyInfoId-Signature-Signature1","sha256","EXCL_C14N","","")
success = gen.SetRefIdAttr("KeyInfoId-Signature-Signature1","ReferenceKeyInfo")

' -------- Reference 3 --------
success = gen.AddSameDocRef("","sha256","EXCL_C14N","","")
success = gen.SetRefIdAttr("","Reference-Signature1")

' Provide a certificate + private key. (PFX password is test123)
Dim cert As New ChilkatCert
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
If (success <> 1) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

success = gen.SetX509Cert(cert,1)

gen.KeyInfoType = "X509Data"
gen.X509Type = "Certificate"

gen.Behaviors = "IndentedSignature"

' -------------------------------------------------------------------------------------------
' To have the EncapsulatedTimeStamp automatically added... 
' 1) Add the <xades:EncapsulatedTimeStamp Encoding="http://uri.etsi.org/01903/v1.2.2#DER">TO BE GENERATED BY CHILKAT</xades:EncapsulatedTimeStamp>
'    to the unsigned properties.  (This was accomplished in the above code.)
' 2) Specify the TSA URL (Timestamping Authority URL).
'    Here we specify the TSA URL:
' -------------------------------------------------------------------------------------------

Dim jsonTsa As New ChilkatJsonObject
success = jsonTsa.UpdateString("timestampToken.tsaUrl","https://www3.postsignum.cz/TSS/TSS_crt/")
success = jsonTsa.UpdateBool("timestampToken.requestTsaCert",1)
success = gen.SetTsa(jsonTsa)

' -------------------------------------------------------------------------------------------
' In this case, the TSA requires client certificate authentication.
' To provide your client certificate, the application will instantiate a Chilkat HTTP object,
' then set it up with a SSL/TLS client certificate, and then tell the XmlDSigGen object
' to use the HTTP object for connections to the TSA server.
' -------------------------------------------------------------------------------------------
Dim http As New ChilkatHttp
success = http.SetSslClientCertPfx("/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx","pfxPassword")
If (success <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

' Tell the XmlDSigGen object to use the above HTTP object for TSA communications.
gen.SetHttpObj http

' 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("c:/temp/qa_output/signedXml.xml","utf-8",0)

Debug.Print sbXml.GetAsString()