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(VB.NET) Verify Multiple Signatures in XMLDemonstrates how to verify multiple signatures within a single XML document.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. ' A sample XML file containing multiple signatures is available at: ' https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml Dim http As New Chilkat.Http Dim sbXml As New Chilkat.StringBuilder Dim success As Boolean = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml",sbXml) If (success <> True) Then Debug.WriteLine(http.LastErrorText) Exit Sub End If ' Load the XML containing the signature to be verified. Dim verifier As New Chilkat.XmlDSig success = verifier.LoadSignatureSb(sbXml) If (success <> True) Then Debug.WriteLine(verifier.LastErrorText) Exit Sub End If ' How many Signatures exist in this XML? Debug.WriteLine("Number of XML signatures = " & verifier.NumSignatures) ' Let's show the XML nicely indented, so we can make sense of it. ' Loading the XML into an XML parser and re-emitting with nice formatting ' changes whitespace that breaks the signatures. We're only doing this ' for the example to examine this XML, which contains 2 ds:Signature's ' and each signature has multiple references. ' This is what we have: ' (scroll down to continue with this example..) ' <?xml version="1.0" encoding="UTF-8" ?> ' <collection Id="root"> ' <album> ' <title>Questions, unanswered</title> ' <artist>Steve and the flubberblubs</artist> ' <year>1989</year> ' <t:tracks xmlns:t="http://test.xades4j/tracks"> ' <t:song length="4:05" tracknumber="1"> ' <t:title>What do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:31</t:lastplayed> ' </t:song> ' <t:song length="3:45" tracknumber="2"> ' <t:title>Who do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:35</t:lastplayed> ' </t:song> ' <t:song length="5:14" tracknumber="3"> ' <t:title>When do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:39</t:lastplayed> ' </t:song> ' <t:song length="4:19" tracknumber="4"> ' <t:title>Do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:44</t:lastplayed> ' </t:song> ' </t:tracks> ' </album> ' <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad"> ' <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-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-ref0" URI="#root"> ' <ds:Transforms> ' <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" /> ' </ds:Transforms> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>rD/g8soqKz8EiPUBhEWfcQacS0ta4ULHX3dKMEH6ZoQ=</ds:DigestValue> ' </ds:Reference> ' <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-signedprops"> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>pfrrRjkGNPiRF2Bjuj3IJTGSEFYc2PDs6FCNAUJOu8E=</ds:DigestValue> ' </ds:Reference> ' </ds:SignedInfo> ' <ds:SignatureValue Id="xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-sigvalue">Vb/2ay4rX9cytiRCmBkgRkE4d0E05nkM412CwOHvTagCXPZZ2B2ifbmrQznTEU6Jz0dF65j5kU7C ' bYK+9fMKB0lmqx2kUdWeBa30Rl/3ELKWKOLeDFN91zC3q4a6dtzQGwBidWex+2dO8Z69sBd2aTS6 ' S6nyGs53kTspDHfBeyg=</ds:SignatureValue> ' <ds:KeyInfo> ' <ds:X509Data> ' <ds:X509Certificate>MIICbTCCAdqgAwIBAgIQpkK0uals+ItHxBlpJuypOTAJBgUrDgMCHQUAMD8xCzAJBgNVBAYTAlBU ' MQ0wCwYDVQQKEwRJU0VMMQswCQYDVQQLEwJDQzEUMBIGA1UEAxMLSXRlcm1lZGlhdGUwHhcNMTAw ' NjI1MTc1ODQ5WhcNMzkxMjMxMjM1OTU5WjBCMQswCQYDVQQGEwJQVDENMAsGA1UEChMESVNFTDEL ' MAkGA1UECxMCQ0MxFzAVBgNVBAMTDkx1aXMgR29uY2FsdmVzMIGfMA0GCSqGSIb3DQEBAQUAA4GN ' ADCBiQKBgQCpP9acMX69Dbg9ciMLFc5dm1tlpTY9OTNZ/EaCYoGVhh/3+DFgyIbEer6SA24hpREm ' AhNG9+Ca0AurDPPgb3aKWFY9pj1WcOctis0VsR0YvzqP+2IGFqKDCd7bXFvv2tI0dEvpdc0oO6PF ' Q02xvJG0kxQf44XljOCjUBU43jkJawIDAQABo28wbTBrBgNVHQEEZDBigBBdbbL4pDKLT56PpOpA ' /56toTwwOjELMAkGA1UEBhMCUFQxDTALBgNVBAoTBElTRUwxCzAJBgNVBAsTAkNDMQ8wDQYDVQQD ' EwZUZXN0Q0GCEN00x9qe7SuWQvpLK0/oay8wCQYFKw4DAh0FAAOBgQBSma8g9dQjiQo4WUljRRuG ' yMUVRyCqW/9oRz8+0EoLNR/AhrIlGqdNbqQ1BkncgNNdqMAus5VD34v/EhgrkgWN5fZajMpYsmcR ' Ahu4PzJ6hggAlWWMy245JwIYuV0s1Oi39GVTxVNOBIX//AONZlGWO4S2Psb1mqdZ99b/MugsaA==</ds:X509Certificate> ' </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-ff7d9ad7-f36d-4af0-b21a-7db2e840efad"> ' <xades:SignedProperties Id="xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-signedprops"> ' <xades:SignedSignatureProperties> ' <xades:SigningCertificate> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>4btVb5gQ5cdcNhGpvDSWQZabPQrR9jf1x8e3YF9Ajss=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=Itermediate,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-119284162484605703133798696662099777223</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>vm5QpbblsWV7fCYXotPhNTeCt4nk8cLFuF36L5RJ4Ok=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=TestCA,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-46248926895392336918291885380930606289</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>AUaN+IdhKQqxIVmEOrFwq+Dn22ebTkXJqD3BoOP/x8E=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=TestCA,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-99704378678639105802976522062798066869</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' </xades:SigningCertificate> ' <xades:SignerRole> ' <xades:ClaimedRoles> ' <xades:ClaimedRole>CounterSignature maniac</xades:ClaimedRole> ' </xades:ClaimedRoles> ' </xades:SignerRole> ' </xades:SignedSignatureProperties> ' </xades:SignedProperties> ' <xades:UnsignedProperties> ' <xades:UnsignedSignatureProperties> ' <xades:CounterSignature> ' <ds:Signature Id="xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> ' <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-7479045c-8083-49eb-9043-1ac2af4a759c-ref0" URI="#xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-sigvalue"> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>Nr5JKCScyqjKWneJw2AC6YmdU/2JZA5Pj40fkVCFbL4=</ds:DigestValue> ' </ds:Reference> ' <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c-signedprops"> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>PJWDlPFdx4TJ5AXT3nIbFa2euboYGM7bpuBmol4nKSQ=</ds:DigestValue> ' </ds:Reference> ' </ds:SignedInfo> ' <ds:SignatureValue Id="xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c-sigvalue">MCcli4l5rAsGeJX2gOmoYDIAXnbszmRwOH94y7kHnpxCwGwoVrCaLSONtgKEy8mj9Ehqa/R5Dj5g ' DgC77VkNIaRKD613JMnbsaqZ7PD0iVivLvBkasTch4PX92UEbk8EvCgzxvhlgN+L6zSLsv65sFcR ' lFUGluMtzrqlDKvts38=</ds:SignatureValue> ' <ds:KeyInfo> ' <ds:X509Data> ' <ds:X509Certificate>MIICbTCCAdqgAwIBAgIQpkK0uals+ItHxBlpJuypOTAJBgUrDgMCHQUAMD8xCzAJBgNVBAYTAlBU ' MQ0wCwYDVQQKEwRJU0VMMQswCQYDVQQLEwJDQzEUMBIGA1UEAxMLSXRlcm1lZGlhdGUwHhcNMTAw ' NjI1MTc1ODQ5WhcNMzkxMjMxMjM1OTU5WjBCMQswCQYDVQQGEwJQVDENMAsGA1UEChMESVNFTDEL ' MAkGA1UECxMCQ0MxFzAVBgNVBAMTDkx1aXMgR29uY2FsdmVzMIGfMA0GCSqGSIb3DQEBAQUAA4GN ' ADCBiQKBgQCpP9acMX69Dbg9ciMLFc5dm1tlpTY9OTNZ/EaCYoGVhh/3+DFgyIbEer6SA24hpREm ' AhNG9+Ca0AurDPPgb3aKWFY9pj1WcOctis0VsR0YvzqP+2IGFqKDCd7bXFvv2tI0dEvpdc0oO6PF ' Q02xvJG0kxQf44XljOCjUBU43jkJawIDAQABo28wbTBrBgNVHQEEZDBigBBdbbL4pDKLT56PpOpA ' /56toTwwOjELMAkGA1UEBhMCUFQxDTALBgNVBAoTBElTRUwxCzAJBgNVBAsTAkNDMQ8wDQYDVQQD ' EwZUZXN0Q0GCEN00x9qe7SuWQvpLK0/oay8wCQYFKw4DAh0FAAOBgQBSma8g9dQjiQo4WUljRRuG ' yMUVRyCqW/9oRz8+0EoLNR/AhrIlGqdNbqQ1BkncgNNdqMAus5VD34v/EhgrkgWN5fZajMpYsmcR ' Ahu4PzJ6hggAlWWMy245JwIYuV0s1Oi39GVTxVNOBIX//AONZlGWO4S2Psb1mqdZ99b/MugsaA==</ds:X509Certificate> ' </ds:X509Data> ' </ds:KeyInfo> ' <ds:Object> ' <xades:QualifyingProperties Target="#xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c" xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" xmlns:xades141="http://uri.etsi.org/01903/v1.4.1#"> ' <xades:SignedProperties Id="xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c-signedprops"> ' <xades:SignedSignatureProperties> ' <xades:SigningTime>2012-10-13T14:26:18.783+01:00</xades:SigningTime> ' <xades:SigningCertificate> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>4btVb5gQ5cdcNhGpvDSWQZabPQrR9jf1x8e3YF9Ajss=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=Itermediate,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-119284162484605703133798696662099777223</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>vm5QpbblsWV7fCYXotPhNTeCt4nk8cLFuF36L5RJ4Ok=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=TestCA,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-46248926895392336918291885380930606289</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' <xades:Cert> ' <xades:CertDigest> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> ' <ds:DigestValue>AUaN+IdhKQqxIVmEOrFwq+Dn22ebTkXJqD3BoOP/x8E=</ds:DigestValue> ' </xades:CertDigest> ' <xades:IssuerSerial> ' <ds:X509IssuerName>CN=TestCA,OU=CC,O=ISEL,C=PT</ds:X509IssuerName> ' <ds:X509SerialNumber>-99704378678639105802976522062798066869</ds:X509SerialNumber> ' </xades:IssuerSerial> ' </xades:Cert> ' </xades:SigningCertificate> ' </xades:SignedSignatureProperties> ' </xades:SignedProperties> ' </xades:QualifyingProperties> ' </ds:Object> ' </ds:Signature> ' </xades:CounterSignature> ' </xades:UnsignedSignatureProperties> ' </xades:UnsignedProperties> ' </xades:QualifyingProperties> ' </ds:Object> ' </ds:Signature> ' </collection> ' ' When I look at the complicated XML above, there are specific things I look at to get a handle ' on the situation. ' ' 1) Does the signature already embed the public keys required for verification? ' Within each <ds:Signature>, look for the <ds:KeyInfo>. In this case, I can see that ' each signature contains the full X.509 certificate needed to verify (<ds:KeyInfo><ds:X509Data><ds:X509Certificate>). ' This means that Chilkat will automatically use the public keys contained within the base64 certificates ' already present in the signature. ' ' 2) Look at each <ds:Reference> within each <ds:Signature>. Do the URI attribute values begin with "#"? ' If so, then these are same-document references, and there's no need to explicitly fetch external data for reference verification. ' Chilkat can automatically validate each same-document Reference. ' ' So it turns out that this seemingly formidable XML document is easy to verify... ' Here we go... Dim i As Integer = 0 While i < verifier.NumSignatures ' The Selector property is used to set our context to the Nth signature. ' For example, if VerifySignature is called when Selector = 0, then the 1st signature is verified. ' If VerifySignature is called when Selector = 1, then the 2nd signature is verified, and so on. verifier.Selector = i Dim verifyReferenceDigests As Boolean = True ' The quick way to validate all references and the signature over the SignedInfo ' is to call VerifySignature with verifyReferenceDigests equal to True. Dim verified As Boolean = verifier.VerifySignature(verifyReferenceDigests) Debug.WriteLine("Signature " & (i + 1) & " and all reference digests verified = " & verified) ' We can also get information about each signature. ' For example, we could get information about each Reference... ' The NumReferences property returns the number of references for the Signature indicated by the Selector property. Dim numReferences As Integer = verifier.NumReferences Debug.WriteLine(" number of references: " & numReferences) Dim j As Integer = 0 While j < numReferences ' Get information about the Jth reference in the Ith signature. Debug.WriteLine(" reference " & j & ":") ' Is this a same-document or external reference? Debug.WriteLine(" is external: " & verifier.IsReferenceExternal(j)) ' For external references, the URI could be used by an application to fetch the referenced data... Debug.WriteLine(" uri: " & verifier.ReferenceUri(j)) j = j + 1 End While ' We could also get the KeyInfo for each Signature, which might be needed if we need to ' load and set a public key that is not physically present within the KeyInfo already. Dim keyInfoXml As Chilkat.Xml = verifier.GetKeyInfo() Debug.WriteLine(" key info: " & keyInfoXml.GetXml()) i = i + 1 End While ' Here's the output of this example: ' Number of XML signatures = 2 ' Signature 1 and all reference digests verified = True ' number of references: 2 ' reference 0: ' is external: False ' uri: #root ' reference 1: ' is external: False ' uri: #xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-signedprops ' key info: ' <ds:KeyInfo> ' <ds:X509Data> ' <ds:X509Certificate> ' MIICbTCCAdqgAwIBAgIQpkK0uals+ItHxBlpJuypOTAJBgUrDgMCHQUAMD8xCzAJBgNVBAYTAlBU ' MQ0wCwYDVQQKEwRJU0VMMQswCQYDVQQLEwJDQzEUMBIGA1UEAxMLSXRlcm1lZGlhdGUwHhcNMTAw ' NjI1MTc1ODQ5WhcNMzkxMjMxMjM1OTU5WjBCMQswCQYDVQQGEwJQVDENMAsGA1UEChMESVNFTDEL ' MAkGA1UECxMCQ0MxFzAVBgNVBAMTDkx1aXMgR29uY2FsdmVzMIGfMA0GCSqGSIb3DQEBAQUAA4GN ' ADCBiQKBgQCpP9acMX69Dbg9ciMLFc5dm1tlpTY9OTNZ/EaCYoGVhh/3+DFgyIbEer6SA24hpREm ' AhNG9+Ca0AurDPPgb3aKWFY9pj1WcOctis0VsR0YvzqP+2IGFqKDCd7bXFvv2tI0dEvpdc0oO6PF ' Q02xvJG0kxQf44XljOCjUBU43jkJawIDAQABo28wbTBrBgNVHQEEZDBigBBdbbL4pDKLT56PpOpA ' /56toTwwOjELMAkGA1UEBhMCUFQxDTALBgNVBAoTBElTRUwxCzAJBgNVBAsTAkNDMQ8wDQYDVQQD ' EwZUZXN0Q0GCEN00x9qe7SuWQvpLK0/oay8wCQYFKw4DAh0FAAOBgQBSma8g9dQjiQo4WUljRRuG ' yMUVRyCqW/9oRz8+0EoLNR/AhrIlGqdNbqQ1BkncgNNdqMAus5VD34v/EhgrkgWN5fZajMpYsmcR ' Ahu4PzJ6hggAlWWMy245JwIYuV0s1Oi39GVTxVNOBIX//AONZlGWO4S2Psb1mqdZ99b/MugsaA== ' </ds:X509Certificate> ' </ds:X509Data> ' </ds:KeyInfo> ' ' Signature 2 and all reference digests verified = True ' number of references: 2 ' reference 0: ' is external: False ' uri: #xmldsig-ff7d9ad7-f36d-4af0-b21a-7db2e840efad-sigvalue ' reference 1: ' is external: False ' uri: #xmldsig-7479045c-8083-49eb-9043-1ac2af4a759c-signedprops ' key info: ' <ds:KeyInfo> ' <ds:X509Data> ' <ds:X509Certificate> ' MIICbTCCAdqgAwIBAgIQpkK0uals+ItHxBlpJuypOTAJBgUrDgMCHQUAMD8xCzAJBgNVBAYTAlBU ' MQ0wCwYDVQQKEwRJU0VMMQswCQYDVQQLEwJDQzEUMBIGA1UEAxMLSXRlcm1lZGlhdGUwHhcNMTAw ' NjI1MTc1ODQ5WhcNMzkxMjMxMjM1OTU5WjBCMQswCQYDVQQGEwJQVDENMAsGA1UEChMESVNFTDEL ' MAkGA1UECxMCQ0MxFzAVBgNVBAMTDkx1aXMgR29uY2FsdmVzMIGfMA0GCSqGSIb3DQEBAQUAA4GN ' ADCBiQKBgQCpP9acMX69Dbg9ciMLFc5dm1tlpTY9OTNZ/EaCYoGVhh/3+DFgyIbEer6SA24hpREm ' AhNG9+Ca0AurDPPgb3aKWFY9pj1WcOctis0VsR0YvzqP+2IGFqKDCd7bXFvv2tI0dEvpdc0oO6PF ' Q02xvJG0kxQf44XljOCjUBU43jkJawIDAQABo28wbTBrBgNVHQEEZDBigBBdbbL4pDKLT56PpOpA ' /56toTwwOjELMAkGA1UEBhMCUFQxDTALBgNVBAoTBElTRUwxCzAJBgNVBAsTAkNDMQ8wDQYDVQQD ' EwZUZXN0Q0GCEN00x9qe7SuWQvpLK0/oay8wCQYFKw4DAh0FAAOBgQBSma8g9dQjiQo4WUljRRuG ' yMUVRyCqW/9oRz8+0EoLNR/AhrIlGqdNbqQ1BkncgNNdqMAus5VD34v/EhgrkgWN5fZajMpYsmcR ' Ahu4PzJ6hggAlWWMy245JwIYuV0s1Oi39GVTxVNOBIX//AONZlGWO4S2Psb1mqdZ99b/MugsaA== ' </ds:X509Certificate> ' </ds:X509Data> ' </ds:KeyInfo> ' ' |
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