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(Excel) XML-DSig Add Reference with Transforms Specified Explicitly

Demonstrates how to use the new AddSameDocRef2 method to explicitly specify the XML Transforms fragment.

Note: This example requires Chilkat v9.5.0.90 or greater.

Download Excel Class Modules

Chilkat Excel Class Modules

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


success = True

' Create the following XML to be signed:

' <doc>
'     <s id="s1">Some text...</s>
'     <p>Some text...</p>
'     <p class="note">A note...</p>
' </doc>

' Use this online tool to generate code from sample XML: 
' Generate Code to Create XML

Dim xmlToSign As Chilkat.Xml
Set xmlToSign = Chilkat.NewXml
xmlToSign.Tag = "doc"
Dim success As Boolean
success = xmlToSign.UpdateAttrAt("s",True,"id","s1")
xmlToSign.UpdateChildContent "s","Some text..."
xmlToSign.UpdateChildContent "p","Some text..."
success = xmlToSign.UpdateAttrAt("p[1]",True,"class","note")
xmlToSign.UpdateChildContent "p[1]","A note..."

Debug.Print xmlToSign.GetXml()

Dim gen As Chilkat.XmlDSigGen
Set gen = Chilkat.NewXmlDSigGen

gen.SigLocation = "doc"
gen.SigLocationMod = 0
gen.SigId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature"
gen.SigNamespacePrefix = "ds"
gen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
gen.SigValueId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue"
gen.SignedInfoCanonAlg = "C14N"
gen.SignedInfoDigestMethod = "sha1"

' Set the KeyInfoId before adding references..
gen.KeyInfoId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo"

' The following XML to be added as an Object to the Signature

' Use this online tool to generate code from sample XML: 
' Generate Code to Create XML

' <xades:QualifyingProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties" Target="#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xades="http://uri.etsi.org/01903/v1.3.2#">
'     <xades:SignedProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties">
'         <xades:SignedSignatureProperties>
'             <xades:SigningTime>TO BE GENERATED BY CHILKAT</xades:SigningTime>
'             <xades:SigningCertificate>
'                 <xades:Cert>
'                     <xades:CertDigest>
'                         <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
'                         <ds:DigestValue>TO BE GENERATED BY CHILKAT</ds:DigestValue>
'                     </xades:CertDigest>
'                     <xades:IssuerSerial>
'                         <ds:X509IssuerName>TO BE GENERATED BY CHILKAT</ds:X509IssuerName>
'                         <ds:X509SerialNumber>TO BE GENERATED BY CHILKAT</ds:X509SerialNumber>
'                     </xades:IssuerSerial>
'                 </xades:Cert>
'             </xades:SigningCertificate>
'         </xades:SignedSignatureProperties>
'         <xades:SignedDataObjectProperties>
'             <xades:DataObjectFormat ObjectReference="#Reference-24eb6003-d41c-442c-a731-d4c58f94790b">
'                 <xades:Description/>
'                 <xades:ObjectIdentifier>
'                     <xades:Identifier Qualifier="OIDAsURN">urn:oid:1.2.840.10003.5.109.10</xades:Identifier>
'                     <xades:Description/>
'                 </xades:ObjectIdentifier>
'                 <xades:MimeType>text/xml</xades:MimeType>
'                 <xades:Encoding/>
'             </xades:DataObjectFormat>
'         </xades:SignedDataObjectProperties>
'     </xades:SignedProperties>
' </xades:QualifyingProperties>

Dim object1 As Chilkat.Xml
Set object1 = Chilkat.NewXml
object1.Tag = "xades:QualifyingProperties"
success = object1.AddAttribute("Id","Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties")
success = object1.AddAttribute("Target","#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature")
success = object1.AddAttribute("xmlns:ds","http://www.w3.org/2000/09/xmldsig#")
success = object1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#")
success = object1.UpdateAttrAt("xades:SignedProperties",True,"Id","Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties")
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",True,"Algorithm","http://www.w3.org/2000/09/xmldsig#sha1")
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 = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat",True,"ObjectReference","#Reference-24eb6003-d41c-442c-a731-d4c58f94790b")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description",""
success = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier",True,"Qualifier","OIDAsURN")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier","urn:oid:1.2.840.10003.5.109.10"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description",""
object1.UpdateChildContent "xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType","text/xml"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Encoding",""

Debug.Print object1.GetXml()

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

' -------- Reference 1 --------

' Create the following Transforms fragment:

' Use this online tool to generate code from sample XML: 
' Generate Code to Create XML

' <ds:Transforms>
'     <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
'     <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
'     <ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
'         <ds:XPath xmlns:ds="http://www.w3.org/2000/09/xmldsig#">not(ancestor-or-self::ds:Signature)</ds:XPath>
'     </ds:Transform>
' </ds:Transforms>

Dim xml1 As Chilkat.Xml
Set xml1 = Chilkat.NewXml
xml1.Tag = "ds:Transforms"
success = xml1.UpdateAttrAt("ds:Transform",True,"Algorithm","http://www.w3.org/TR/2001/REC-xml-c14n-20010315")
success = xml1.UpdateAttrAt("ds:Transform[1]",True,"Algorithm","http://www.w3.org/2000/09/xmldsig#enveloped-signature")
success = xml1.UpdateAttrAt("ds:Transform[2]",True,"Algorithm","http://www.w3.org/TR/1999/REC-xpath-19991116")
success = xml1.UpdateAttrAt("ds:Transform[2]|ds:XPath",True,"xmlns:ds","http://www.w3.org/2000/09/xmldsig#")
xml1.UpdateChildContent "ds:Transform[2]|ds:XPath","not(ancestor-or-self::ds:Signature)"

' This is the "Transforms" XML fragment passed to AddSameDocRef2.
Debug.Print xml1.GetXml()

success = gen.AddSameDocRef2("","sha1",xml1,"")

success = gen.SetRefIdAttr("","Reference-24eb6003-d41c-442c-a731-d4c58f94790b")

' -------- Reference 2 --------
success = gen.AddObjectRef("Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties","sha1","","","http://uri.etsi.org/01903#SignedProperties")

' -------- Reference 3 --------
success = gen.AddSameDocRef("Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo","sha1","","","")

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

success = gen.SetX509Cert(cert,True)

gen.KeyInfoType = "X509Data+KeyValue"
gen.X509Type = "CertChain"

' Load XML to be signed...
Dim sbXml As Chilkat.StringBuilder
Set sbXml = Chilkat.NewStringBuilder
success = xmlToSign.GetXmlSb(sbXml)

gen.Behaviors = "IndentedSignature"

' Sign the XML...
success = gen.CreateXmlDSigSb(sbXml)
If (success <> True) 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",False)

Debug.Print sbXml.GetAsString()

' ----------------------------------------
' Verify the signatures we just produced...
Dim verifier As Chilkat.XmlDSig
Set verifier = Chilkat.NewXmlDSig
success = verifier.LoadSignatureSb(sbXml)
If (success <> True) Then
    Debug.Print verifier.LastErrorText
    Exit Sub
End If


numSigs = verifier.NumSignatures

verifyIdx = 0
Do While verifyIdx < numSigs
    verifier.Selector = verifyIdx

    verified = verifier.VerifySignature(True)
    If (verified <> True) Then
        Debug.Print verifier.LastErrorText
        Exit Sub
    End If

    verifyIdx = verifyIdx + 1
Loop
Debug.Print "All signatures were successfully verified."
 

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