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(VB.NET) XML Signature Multiple External ReferencesDemonstrates how to add multiple external references to an XML digital signature.
' 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> ' Dim success As Boolean = True Dim gen As New Chilkat.XmlDSigGen 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 New Chilkat.Xml object1.Tag = "xades:QualifyingProperties" object1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#") object1.AddAttribute("xmlns:xades141","http://uri.etsi.org/01903/v1.4.1#") object1.AddAttribute("Target","#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4") 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... object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod",True,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256") object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT") object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2","TO BE GENERATED BY CHILKAT") gen.AddObject("",object1.GetXml(),"","") Dim http As New Chilkat.Http Dim bd As New Chilkat.BinData Dim url As String = "https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456" success = http.QuickGetBd(url,bd) If (success <> True) Then Debug.WriteLine(http.LastErrorText) Exit Sub End If ' -------- Reference 1 -------- gen.AddExternalBinaryRef(url,bd,"sha256","") gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0") ' -------- Reference 2 -------- bd.Clear() url = "https://isus.ezdrowie.gov.pl/fhir/Encounter/789/_history/1" success = http.QuickGetBd(url,bd) If (success <> True) Then Debug.WriteLine(http.LastErrorText) Exit Sub End If gen.AddExternalBinaryRef(url,bd,"sha256","") gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1") ' -------- Reference 3 -------- bd.Clear() url = "https://isus.ezdrowie.gov.pl/fhir/Condition/123456/_history/1" success = http.QuickGetBd(url,bd) If (success <> True) Then Debug.WriteLine(http.LastErrorText) Exit Sub End If gen.AddExternalBinaryRef(url,bd,"sha256","") gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2") ' -------- Reference 4 -------- bd.Clear() url = "https://isus.ezdrowie.gov.pl/fhir/Procedure/123456/_history/1" success = http.QuickGetBd(url,bd) If (success <> True) Then Debug.WriteLine(http.LastErrorText) Exit Sub End If gen.AddExternalBinaryRef(url,bd,"sha256","") gen.SetRefIdAttr(url,"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3") ' -------- Reference 5 -------- 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 New Chilkat.Cert success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123") If (success <> True) Then Debug.WriteLine(cert.LastErrorText) Exit Sub End If 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 New Chilkat.StringBuilder gen.Behaviors = "IndentedSignature" ' Sign the XML... success = gen.CreateXmlDSigSb(sbXml) If (success <> True) Then Debug.WriteLine(gen.LastErrorText) Exit Sub End If ' ----------------------------------------------- ' Save the signed XML to a file. success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",False) Debug.WriteLine(sbXml.GetAsString()) ' ---------------------------------------- ' Verify the signature we just produced... Dim verifier As New Chilkat.XmlDSig success = verifier.LoadSignatureSb(sbXml) If (success <> True) Then Debug.WriteLine(verifier.LastErrorText) Exit Sub End If Dim verified As Boolean = verifier.VerifySignature(True) If (verified <> True) Then Debug.WriteLine(verifier.LastErrorText) Exit Sub End If Debug.WriteLine("This signature was successfully verified.") |
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