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(PHP Extension) Canonicalize XML FragmentDemonstrates how to canonicalize a fragment of an XML document. The fragment is identified by the element having an Id attribute equal to a specified value. (The Id attribute can have any namespace, and the attribute name is case-insensitive (thus "ID", "Id", "id", etc. match).
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $http = new CkHttp(); $sbXml = new CkStringBuilder(); $canon = new CkXmlDSig(); // Use exclusive XML canonicalization. $canonVersion = 'EXCL_C14N'; $withComments = false; // The optional inclusive namespaces prefix list if using exclusive canonicalization. $prefixList = ''; $url = 'https://www.chilkatsoft.com/exampleData/canonicalizeFragmentTest.xml'; $success = $http->QuickGetSb($url,$sbXml); // This is the input XML: // <?xml version="1.0" encoding="UTF-8"?> // <Signature xmlns="http://www.w3.org/2000/09/xmldsig#"> // <SignedInfo> // <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" /> // <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" /> // <Reference URI="#object"> // <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" /> // <DigestValue>OPnpF/ZNLDxJ/I+1F3iHhlmSwgo=</DigestValue> // </Reference> // </SignedInfo> // <SignatureValue>nihUFQg4mDhLgecvhIcKb9Gz8VRTOlw+adiZOBBXgK4JodEe5aFfCqm8WcRIT8GL // LXSk8PsUP4//SsKqUBQkpotcAqQAhtz2v9kCWdoUDnAOtFZkd/CnsZ1sge0ndha4 // 0wWDV+nOWyJxkYgicvB8POYtSmldLLepPGMz+J7/Uws=</SignatureValue> // <KeyInfo> // <KeyValue> // <RSAKeyValue> // <Modulus>4IlzOY3Y9fXoh3Y5f06wBbtTg94Pt6vcfcd1KQ0FLm0S36aGJtTSb6pYKfyX7PqC // UQ8wgL6xUJ5GRPEsu9gyz8ZobwfZsGCsvu40CWoT9fcFBZPfXro1Vtlh/xl/yYHm // +Gzqh0Bw76xtLHSfLfpVOrmZdwKmSFKMTvNXOFd0V18=</Modulus> // <Exponent>AQAB</Exponent> // </RSAKeyValue> // </KeyValue> // </KeyInfo> // <Object Id="object">some text // with spaces and CR-LF.</Object> // </Signature> // Canonicalize and return the fragment of XML starting at the element where the Id attribute equals "object". $xmlCanonFrag = $canon->canonicalizeFragment($sbXml->getAsString(),'object',$canonVersion,$prefixList,$withComments); print $xmlCanonFrag . "\n"; // The output is: // // <Object xmlns="http://www.w3.org/2000/09/xmldsig#" Id="object">some text // with spaces and CR-LF.</Object> // ?> |
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