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(Unicode C) Verify Multiple Signatures in XMLDemonstrates how to verify multiple signatures within a single XML document.
#include <C_CkHttpW.h> #include <C_CkStringBuilderW.h> #include <C_CkXmlDSigW.h> #include <C_CkXmlW.h> void ChilkatSample(void) { HCkHttpW http; HCkStringBuilderW sbXml; BOOL success; HCkXmlDSigW verifier; int i; BOOL verifyReferenceDigests; BOOL verified; int numReferences; int j; HCkXmlW keyInfoXml; // 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 = CkHttpW_Create(); sbXml = CkStringBuilderW_Create(); success = CkHttpW_QuickGetSb(http,L"https://www.chilkatsoft.com/exampleData/document.signed.bes.cs.xml",sbXml); if (success != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); return; } // Load the XML containing the signature to be verified. verifier = CkXmlDSigW_Create(); success = CkXmlDSigW_LoadSignatureSb(verifier,sbXml); if (success != TRUE) { wprintf(L"%s\n",CkXmlDSigW_lastErrorText(verifier)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); CkXmlDSigW_Dispose(verifier); return; } // How many Signatures exist in this XML? wprintf(L"Number of XML signatures = %d\n",CkXmlDSigW_getNumSignatures(verifier)); // 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 < CkXmlDSigW_getNumSignatures(verifier)) { // 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. CkXmlDSigW_putSelector(verifier,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 = CkXmlDSigW_VerifySignature(verifier,verifyReferenceDigests); wprintf(L"Signature %d and all reference digests verified = %d\n",i + 1,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 = CkXmlDSigW_getNumReferences(verifier); wprintf(L" number of references: %d\n",numReferences); j = 0; while (j < numReferences) { // Get information about the Jth reference in the Ith signature. wprintf(L" reference %d:\n",j); // Is this a same-document or external reference? wprintf(L" is external: %d\n",CkXmlDSigW_IsReferenceExternal(verifier,j)); // For external references, the URI could be used by an application to fetch the referenced data... wprintf(L" uri: %s\n",CkXmlDSigW_referenceUri(verifier,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 = CkXmlDSigW_GetKeyInfo(verifier); wprintf(L" key info: %s\n",CkXmlW_getXml(keyInfoXml)); CkXmlW_Dispose(keyInfoXml); 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> // // CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbXml); CkXmlDSigW_Dispose(verifier); } |
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