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(Excel) XML Signature Multiple External References

Demonstrates how to add multiple external references to an XML digital signature.

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.

' This example creates the following signed XML with multiple external references:

' <?xml version="1.0" encoding="UTF-8"?>
' <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4">
'     <ds:SignedInfo>
'         <ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
'         <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
'         <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0" URI="https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456">
'             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'             <ds:DigestValue>...</ds:DigestValue>
'         </ds:Reference>
'         <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1" URI="https://isus.ezdrowie.gov.pl/fhir/Encounter/124/_history/22">
'             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'             <ds:DigestValue>...</ds:DigestValue>
'         </ds:Reference>
'         <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2" URI="https://isus.ezdrowie.gov.pl/fhir/Condition/125/_history/1">
'             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'             <ds:DigestValue>...</ds:DigestValue>
'         </ds:Reference>
'         <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3" URI="https://isus.ezdrowie.gov.pl/fhir/Procedure/126/_history/1">
'             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'             <ds:DigestValue>...</ds:DigestValue>
'         </ds:Reference>
'         <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops">
'             <ds:Transforms>
'                 <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
'             </ds:Transforms>
'             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'             <ds:DigestValue>...</ds:DigestValue>
'         </ds:Reference>
'     </ds:SignedInfo>
'     <ds:SignatureValue Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue">...</ds:SignatureValue>
'     <ds:KeyInfo>
'         <ds:X509Data>
'             <ds:X509Certificate>...</ds:X509Certificate>
'             <ds:X509SubjectName>...</ds:X509SubjectName>
'             <ds:X509IssuerSerial>
'                 <ds:X509IssuerName>...</ds:X509IssuerName>
'                 <ds:X509SerialNumber>...</ds:X509SerialNumber>
'             </ds:X509IssuerSerial>
'         </ds:X509Data>
'     </ds:KeyInfo>
'     <ds:Object>
'         <xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" xmlns:xades141="http://uri.etsi.org/01903/v1.4.1#" Target="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4">
'             <xades:SignedProperties Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops">
'                 <xades:SignedSignatureProperties>
'                     <xades:SigningTime>2021-06-02T07:10:13.306+02:00</xades:SigningTime>
'                     <xades:SigningCertificate>
'                         <xades:Cert>
'                             <xades:CertDigest>
'                                 <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'                                 <ds:DigestValue>...</ds:DigestValue>
'                             </xades:CertDigest>
'                             <xades:IssuerSerial>
'                                 <ds:X509IssuerName>...</ds:X509IssuerName>
'                                 <ds:X509SerialNumber>...</ds:X509SerialNumber>
'                             </xades:IssuerSerial>
'                         </xades:Cert>
'                         <xades:Cert>
'                             <xades:CertDigest>
'                                 <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'                                 <ds:DigestValue>...</ds:DigestValue>
'                             </xades:CertDigest>
'                             <xades:IssuerSerial>
'                                 <ds:X509IssuerName>...</ds:X509IssuerName>
'                                 <ds:X509SerialNumber>...</ds:X509SerialNumber>
'                             </xades:IssuerSerial>
'                         </xades:Cert>
'                         <xades:Cert>
'                             <xades:CertDigest>
'                                 <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'                                 <ds:DigestValue>...</ds:DigestValue>
'                             </xades:CertDigest>
'                             <xades:IssuerSerial>
'                                 <ds:X509IssuerName>...</ds:X509IssuerName>
'                                 <ds:X509SerialNumber>...</ds:X509SerialNumber>
'                             </xades:IssuerSerial>
'                         </xades:Cert>
'                     </xades:SigningCertificate>
'                 </xades:SignedSignatureProperties>
'             </xades:SignedProperties>
'         </xades:QualifyingProperties>
'     </ds:Object>
' </ds:Signature>
' 


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

gen.SigLocation = ""
gen.SigLocationMod = 0
' Note: ID's simply need to be unique values in the signed XML document.  They don't necessarily need to be GUID/UUID formatted.
gen.SigId = "xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4"
gen.SigNamespacePrefix = "ds"
gen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
gen.SigValueId = "xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue"
gen.SignedInfoCanonAlg = "C14N"
gen.SignedInfoDigestMethod = "sha256"

' Create an Object to be added to the Signature.
Dim object1 As Chilkat.Xml
Set object1 = Chilkat.NewXml
object1.Tag = "xades:QualifyingProperties"
Dim success As Boolean
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-2dde88a8-def0-43e4-8570-b031015a46b4")
success = object1.UpdateAttrAt("xades:SignedProperties",True,"Id","xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime","TO BE GENERATED BY CHILKAT"
' This assumes there are 3 certs in the certificate chain:  The signing certificate, an intermediate root, and the root CA.
' Remove the lines with "Cert[2]" if there is no intermediate root...
success = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod",True,"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 = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:CertDigest|ds:DigestMethod",True,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:IssuerSerial|ds:X509IssuerName","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:IssuerSerial|ds:X509SerialNumber","TO BE GENERATED BY CHILKAT"
success = object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:CertDigest|ds:DigestMethod",True,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256")
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:IssuerSerial|ds:X509IssuerName","TO BE GENERATED BY CHILKAT"
object1.UpdateChildContent "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:IssuerSerial|ds:X509SerialNumber","TO BE GENERATED BY CHILKAT"

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

Dim http As Chilkat.Http
Set http = Chilkat.NewHttp
Dim bd As Chilkat.BinData
Set bd = Chilkat.NewBinData


url = "https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456"
success = http.QuickGetBd(url,bd)
If (success <> True) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

' -------- Reference 1 --------
success = gen.AddExternalBinaryRef(url,bd,"sha256","")
success = gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0")

' -------- Reference 2 --------
success = bd.Clear()
url = "https://isus.ezdrowie.gov.pl/fhir/Encounter/789/_history/1"
success = http.QuickGetBd(url,bd)
If (success <> True) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

success = gen.AddExternalBinaryRef(url,bd,"sha256","")
success = gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1")

' -------- Reference 3 --------
success = bd.Clear()
url = "https://isus.ezdrowie.gov.pl/fhir/Condition/123456/_history/1"
success = http.QuickGetBd(url,bd)
If (success <> True) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

success = gen.AddExternalBinaryRef(url,bd,"sha256","")
success = gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2")

' -------- Reference 4 --------
success = bd.Clear()
url = "https://isus.ezdrowie.gov.pl/fhir/Procedure/123456/_history/1"
success = http.QuickGetBd(url,bd)
If (success <> True) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

success = gen.AddExternalBinaryRef(url,bd,"sha256","")
success = gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3")

' -------- Reference 5 --------
success = gen.AddObjectRef("xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops","sha256","C14N","","http://uri.etsi.org/01903#SignedProperties")

' 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"
gen.X509Type = "IssuerSerial,SubjectName,Certificate"

' This will be an enveloping signature where the Signature element
' is the XML document root, the signed data is contained within Object
' tag(s) within the Signature.
' Therefore, pass an empty sbXml to CreateXmlDsigSb.
Dim sbXml As Chilkat.StringBuilder
Set sbXml = Chilkat.NewStringBuilder

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 signature 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


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

Debug.Print "This signature was successfully verified."
 

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