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Verify Multiple Signatures in XML
See more XML Digital Signatures Examples
Demonstrates how to verify multiple signatures within a single XML document.Chilkat PowerShell Downloads
Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"
$success = $false
# 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
$http = New-Object Chilkat.Http
$sbXml = New-Object Chilkat.StringBuilder
$success = $http.QuickGetSb("https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml",$sbXml)
if ($success -ne $true) {
$($http.LastErrorText)
exit
}
# Load the XML containing the signature to be verified.
$verifier = New-Object Chilkat.XmlDSig
$success = $verifier.LoadSignatureSb($sbXml)
if ($success -ne $true) {
$($verifier.LastErrorText)
exit
}
# How many Signatures exist in this XML?
$("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...
$i = 0
while ($i -lt $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
$verifyReferenceDigests = $true
# The quick way to validate all references and the signature over the SignedInfo
# is to call VerifySignature with verifyReferenceDigests equal to $true.
$verified = $verifier.VerifySignature($verifyReferenceDigests)
$("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.
$numReferences = $verifier.NumReferences
$(" number of references: " + $numReferences)
$j = 0
while ($j -lt $numReferences) {
# Get information about the Jth reference in the Ith signature.
$(" reference " + $j + ":")
# Is this a same-document or external reference?
$(" is external: " + $verifier.IsReferenceExternal($j))
# For external references, the URI could be used by an application to fetch the referenced data...
$(" uri: " + $verifier.ReferenceUri($j))
$j = $j + 1
}
# 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.
$keyInfoXml = $verifier.GetKeyInfo()
$(" key info: " + $keyInfoXml.GetXml())
$i = $i + 1
}
# 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>
#
#