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(Visual FoxPro) Verify Multiple Signatures in XMLDemonstrates how to verify multiple signatures within a single XML document.
LOCAL loHttp LOCAL loSbXml LOCAL lnSuccess LOCAL loVerifier LOCAL i LOCAL lnVerifyReferenceDigests LOCAL lnVerified LOCAL lnNumReferences LOCAL j LOCAL loKeyInfoXml * 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 * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http') loHttp = CreateObject('Chilkat.Http') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbXml = CreateObject('Chilkat.StringBuilder') lnSuccess = loHttp.QuickGetSb("https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml",loSbXml) IF (lnSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loHttp RELEASE loSbXml CANCEL ENDIF * Load the XML containing the signature to be verified. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.XmlDSig') loVerifier = CreateObject('Chilkat.XmlDSig') lnSuccess = loVerifier.LoadSignatureSb(loSbXml) IF (lnSuccess <> 1) THEN ? loVerifier.LastErrorText RELEASE loHttp RELEASE loSbXml RELEASE loVerifier CANCEL ENDIF * How many Signatures exist in this XML? ? "Number of XML signatures = " + STR(loVerifier.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 DO WHILE i < loVerifier.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. loVerifier.Selector = i lnVerifyReferenceDigests = 1 * The quick way to validate all references and the signature over the SignedInfo * is to call VerifySignature with verifyReferenceDigests equal to 1. lnVerified = loVerifier.VerifySignature(lnVerifyReferenceDigests) ? "Signature " + STR(i + 1) + " and all reference digests verified = " + STR(lnVerified) * 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. lnNumReferences = loVerifier.NumReferences ? " number of references: " + STR(lnNumReferences) j = 0 DO WHILE j < lnNumReferences * Get information about the Jth reference in the Ith signature. ? " reference " + STR(j) + ":" * Is this a same-document or external reference? ? " is external: " + STR(loVerifier.IsReferenceExternal(j)) * For external references, the URI could be used by an application to fetch the referenced data... ? " uri: " + loVerifier.ReferenceUri(j) j = j + 1 ENDDO * 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. loKeyInfoXml = loVerifier.GetKeyInfo() ? " key info: " + loKeyInfoXml.GetXml() RELEASE loKeyInfoXml i = i + 1 ENDDO * 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> * * RELEASE loHttp RELEASE loSbXml RELEASE loVerifier |
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