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(C#) 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.
// 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: string url = "https://www.chilkatsoft.com/exampleData/signedUsingKeyName.xml"; Chilkat.Http http = new Chilkat.Http(); Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder(); bool success = http.QuickGetSb(url,sbXml); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } Chilkat.XmlDSig verifier = new Chilkat.XmlDSig(); // Load the XML containing the signature to be verified. success = verifier.LoadSignatureSb(sbXml); if (success != true) { Debug.WriteLine(verifier.LastErrorText); return; } // (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. Chilkat.Xml xmlKeyInfo = verifier.GetKeyInfo(); if (verifier.LastMethodSuccess == false) { Debug.WriteLine("There is no KeyInfo available in the Signature."); return; } // Examine the XML: Debug.WriteLine(xmlKeyInfo.GetXml()); // The KeyInfo XML that is returned looks like this: // // <ds:KeyInfo> // <ds:KeyName>dsaKey_123</ds:KeyName> // </ds:KeyInfo> // // Get the KeyName. Chilkat.StringBuilder sbKeyName = new Chilkat.StringBuilder(); sbKeyName.Append(xmlKeyInfo.GetChildContent("*:KeyName")); // sbKeyName contains "dsaKey_123" Debug.WriteLine(sbKeyName.GetAsString()); // 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) { Debug.WriteLine("I don't know this key..."); return; } // The DSA public key used in this example is available at: // https://www.chilkatsoft.com/exampleData/dsa1024_public.zip Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); success = pubKey.LoadFromFile("qa_data/dsa/dsa1024_public.pem"); if (success != true) { Debug.WriteLine(pubKey.LastErrorText); return; } // Provide the DSA public key to the XML DSig verifier: verifier.SetPublicKey(pubKey); // Verify the signature bool bVerified = verifier.VerifySignature(true); Debug.WriteLine("Signature verified = " + Convert.ToString(bVerified)); |
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