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(PHP Extension) Verify XML Digital Signature having KeyNameDemonstrates how to verify an XML digital signature where the KeyInfo part contains the KeyName element. This example requires Chilkat v9.5.0.69 or greater.
<?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. // The signed XML to be verified in this example contains the following: // // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <Envelope> // <Header> // <Security> // <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2009/xmldsig11#dsa-sha256"/><ds:Reference URI="#abc"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>XTjDIHSEsDNTO9yn4cKtyXjRUjPFXkOQOLYI5mueZhk=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>NXOIMevGCqFl0Dwtp2KkqkT05GRV8CjmHZ9LhFpt8/d7+lkIi7mITA==</ds:SignatureValue><ds:KeyInfo><ds:KeyName>dsaKey_123</ds:KeyName></ds:KeyInfo></ds:Signature></Security> // </Header> // <Body Id="abc"> // <z:FooBar xmlns:z="https://www.example-code.com"/> // </Body> // </Envelope> // // The above XML is available at https://www.chilkatsoft.com/exampleData/signedUsingKeyName.xml // First we'll fetch the signed XML: $url = 'https://www.chilkatsoft.com/exampleData/signedUsingKeyName.xml'; $http = new CkHttp(); $sbXml = new CkStringBuilder(); $success = $http->QuickGetSb($url,$sbXml); if ($success != true) { print $http->lastErrorText() . "\n"; exit; } $verifier = new CkXmlDSig(); // Load the XML containing the signature to be verified. $success = $verifier->LoadSignatureSb($sbXml); if ($success != true) { print $verifier->lastErrorText() . "\n"; exit; } // (The Chilkat XML Digital Signature API has the capability to handle XML documents with multiple signatures. // We know in advance that this signed XML has just one Signature, so we leave the dsig.Selector property at the // default value of 0.) // Let's get the KeyInfo XML so we can then get the KeyName. // xmlKeyInfo is a CkXml $xmlKeyInfo = $verifier->GetKeyInfo(); if ($verifier->get_LastMethodSuccess() == false) { print 'There is no KeyInfo available in the Signature.' . "\n"; exit; } // Examine the XML: print $xmlKeyInfo->getXml() . "\n"; // The KeyInfo XML that is returned looks like this: // // <ds:KeyInfo> // <ds:KeyName>dsaKey_123</ds:KeyName> // </ds:KeyInfo> // // Get the KeyName. $sbKeyName = new CkStringBuilder(); $sbKeyName->Append($xmlKeyInfo->getChildContent('*:KeyName')); // sbKeyName contains "dsaKey_123" print $sbKeyName->getAsString() . "\n"; // The application now locates and loads the public key for verification // based on the key name. This example will do the following: // If the key name equals "dsaKey_123", then load the DSA key from // "qa_data/dsa/dsa1024_public.pem" // if ($sbKeyName->ContentsEqual('dsaKey_123',false) == false) { print 'I don't know this key...' . "\n"; exit; } // The DSA public key used in this example is available at: // https://www.chilkatsoft.com/exampleData/dsa1024_public.zip $pubKey = new CkPublicKey(); $success = $pubKey->LoadFromFile('qa_data/dsa/dsa1024_public.pem'); if ($success != true) { print $pubKey->lastErrorText() . "\n"; exit; } // Provide the DSA public key to the XML DSig verifier: $verifier->SetPublicKey($pubKey); // Verify the signature $bVerified = $verifier->VerifySignature(true); print 'Signature verified = ' . $bVerified . "\n"; ?> |
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