Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(PHP ActiveX) Verify an XML Signature with Multiple ReferencesDemonstrates how to verify an XML digital signature that contains multiple references.
<?php // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // An example of an enveloping XML signature with mulitple references is available at // https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml // This example will show how to verify the signature and all references, and also how // to verify each reference individually. This is useful to distinguish which part // of the XML signature validation failed. It could be that one or more of the references // failed because of a hash computation mismatch. Or it could be that the signature over // the SignedInfo failed. // First, let's grab the sample XML signature. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Http') $http = new COM("Chilkat.Http"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder') $sbXml = new COM("Chilkat.StringBuilder"); $success = $http->QuickGetSb('https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml',$sbXml); if ($success != 1) { print $http->LastErrorText . "\n"; exit; } // Load the XML containing the signature to be verified. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.XmlDSig') $verifier = new COM("Chilkat.XmlDSig"); $success = $verifier->LoadSignatureSb($sbXml); if ($success != 1) { print $verifier->LastErrorText . "\n"; exit; } $verifyReferenceDigests = 1; // The quick way to validate all references and the signature over the SignedInfo // is to call VerifySignature with verifyReferenceDigests equal to 1. $verified = $verifier->VerifySignature($verifyReferenceDigests); print 'Signature and all reference digests verified = ' . $verified . "\n"; // Let's pretend the call to VerifySignature returned 0. Something did not validate. // Was it one or more of the References that did not hash to the correct value? // Or was it the signature over the SignedInfo that failed? // We can check just the signature over the SignedInfo by passing 0 to VerifySignature. // This allows us to skip the hashing and checking each Reference. $verifyReferenceDigests = 0; $signedInfoVerified = $verifier->VerifySignature($verifyReferenceDigests); print 'Neglecting the reference hashes, the SignedInfo validation result = ' . $signedInfoVerified . "\n"; // We can also verify each reference digest separately $numRefs = $verifier->NumReferences; $i = 0; while ($i < $numRefs) { $refDigestVerified = $verifier->VerifyReferenceDigest($i); print 'Reference ' . $i . ' digest verified = ' . $refDigestVerified . "\n"; $i = $i + 1; } // For this sample XML signature with 3 References, we get the following output: // Signature and all reference digests verified = True // Neglecting the reference hashes, the SignedInfo validation result = True // Reference 0 digest verified = True // Reference 1 digest verified = True // Reference 2 digest verified = Tru ?> |
© 2000-2024 Chilkat Software, Inc. All Rights Reserved.