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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 AutoIt Downloads
Local $bSuccess = 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
$oHttp = ObjCreate("Chilkat.Http")
$oSbXml = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oHttp.QuickGetSb("https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml",$oSbXml)
If ($bSuccess <> True) Then
ConsoleWrite($oHttp.LastErrorText & @CRLF)
Exit
EndIf
; Load the XML containing the signature to be verified.
$oVerifier = ObjCreate("Chilkat.XmlDSig")
$bSuccess = $oVerifier.LoadSignatureSb($oSbXml)
If ($bSuccess <> True) Then
ConsoleWrite($oVerifier.LastErrorText & @CRLF)
Exit
EndIf
; How many Signatures exist in this XML?
ConsoleWrite("Number of XML signatures = " & $oVerifier.NumSignatures & @CRLF)
; 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...
Local $i = 0
While $i < $oVerifier.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.
$oVerifier.Selector = $i
Local $bVerifyReferenceDigests = True
; The quick way to validate all references and the signature over the SignedInfo
; is to call VerifySignature with verifyReferenceDigests equal to True.
Local $bVerified = $oVerifier.VerifySignature($bVerifyReferenceDigests)
ConsoleWrite("Signature " & ($i + 1) & " and all reference digests verified = " & $bVerified & @CRLF)
; 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.
Local $iNumReferences = $oVerifier.NumReferences
ConsoleWrite(" number of references: " & $iNumReferences & @CRLF)
Local $iJ = 0
While $iJ < $iNumReferences
; Get information about the Jth reference in the Ith signature.
ConsoleWrite(" reference " & $iJ & ":" & @CRLF)
; Is this a same-document or external reference?
ConsoleWrite(" is external: " & $oVerifier.IsReferenceExternal($iJ) & @CRLF)
; For external references, the URI could be used by an application to fetch the referenced data...
ConsoleWrite(" uri: " & $oVerifier.ReferenceUri($iJ) & @CRLF)
$iJ = $iJ + 1
Wend
; 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.
Local $oKeyInfoXml = $oVerifier.GetKeyInfo()
ConsoleWrite(" key info: " & $oKeyInfoXml.GetXml() & @CRLF)
$i = $i + 1
Wend
; 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>
;
;