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(C#) Verify XML Signature having KeyInfo / X509Data / X509SKIThis example demonstrates how to verify an XML Digital Signature where the KeyInfo element contains an X509Data element,
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The SOAP XML with digital signature verified in this example is available at // https://www.chilkatsoft.com/exampleData/sigWithX509SKI.xml string signedSoapXmlUrl = "https://www.chilkatsoft.com/exampleData/sigWithX509SKI.xml"; // First, let's get the signed SOAP XML.. Chilkat.Http http = new Chilkat.Http(); Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder(); bool success = http.QuickGetSb(signedSoapXmlUrl,sbXml); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } // The signed XML downloaded from the above URL contains the following. // <?xml version="1.0" encoding="UTF-8" standalone="no" ?> // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> // <SOAP-ENV:Header> // <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"><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#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#Body"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ds:DigestValue>PIiVPpuMc1jGpWaL8ftzTOcc4gc=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>Rlta8LplnFH0q8L+UeVmh4Smdn6oVETi4RoUmpT/KQX3RNAIOdCVE3b7gjmx5+3vp3DhjphOsZvW6dXzkI46xt9pD5otp3b/ZppGqKzltggo9gyQtPvJ8ltJZqVKYOGo5uElRFF/xm/zcx5Y3E14t+LYVSlv2lbem/zZ5zQ7ai8DmGD33id7nGu+MXVwb3kGkJFYoB/GOXtwsep+bcilMglTp8/7SBfBaVFKxWVBp4N2NW7bGlyDct8FaCk9hXQDNm/kqne9GU87tgh8/rbsFCYgyqIRMIvMPvhRWr2EKdEKyLtlZ8w0KYJYpgsf4T7SDghemzXkJoJPrfUQmHudIw==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509SKI>bDMtm8bAimMlGLU2M/82W8+y3tM=</ds:X509SKI></ds:X509Data></ds:KeyInfo></ds:Signature></wsse:Security> // </SOAP-ENV:Header> // <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body"> // <z:FooBar xmlns:z="http://example.com" /> // </SOAP-ENV:Body> // </SOAP-ENV:Envelope> // Note: We don't have everything we need to verify the signature. // The KeyInfo part of the Signature contains only the signing cert's Subject Key Identifier. // We must obtain the certificate locally using this information. // // On a Windows system, if the matching certificate is already installed in the registry-based // certificate stores, then your application does not need to do anything. Chilkat will automatically // locate and use the matching certificate installed on the Windows system. // // This example will assume we're not on a Windows system, or that the matching certificate // is not already installed on the system. // // One strategy for providing certificates to the application doing the XML signature verification // is to load all possible certificates into an in-memory XmlCertVault beforehand, and then call // UseCertVault to allow for Chilkat to automatically find the matching cert from the pre-loaded certificates. // We'll do that here with the one certificate that we already know is the matching certificate. Chilkat.StringBuilder sbCertPem = new Chilkat.StringBuilder(); success = http.QuickGetSb("https://chilkatdownload.com/example_data/testcertificate.pem",sbCertPem); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } // Create a cert vault and add the certificates. // In this example, we're only adding a single certificate. An application // could load many certificates into the cert vault.. Chilkat.XmlCertVault certVault = new Chilkat.XmlCertVault(); success = certVault.AddCertString(sbCertPem.GetAsString()); if (success != true) { Debug.WriteLine(certVault.LastErrorText); return; } Chilkat.XmlDSig verifier = new Chilkat.XmlDSig(); // Tell the verifier to use the certVault as a source for locating // matching certificates. verifier.UseCertVault(certVault); success = verifier.LoadSignatureSb(sbXml); if (success != true) { Debug.WriteLine(verifier.LastErrorText); return; } bool bVerified = verifier.VerifySignature(true); if (bVerified != true) { Debug.WriteLine(verifier.LastErrorText); return; } Debug.WriteLine("Signature verified!"); |
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