(.NET Core C#) Create XML Signature using Java KeyStore (.jks)

Demonstrates how to create an XML digital signature using a certificate and private key from a Java KeyStore (.jks)

Chilkat .NET Downloads Chilkat .NET Assemblies Chilkat for .NET Core Chilkat for Mono

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The SOAP XML to be signed in this example 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"></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>
// 

// Build the XML to sign.
// Use this online tool to generate the code from sample XML: 
// Generate Code to Create XML

Chilkat.Xml xml = new Chilkat.Xml();
xml.Tag = "SOAP-ENV:Envelope";
xml.AddAttribute("xmlns:SOAP-ENV","http://schemas.xmlsoap.org/soap/envelope/");
xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security",true,"xmlns:wsse","http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security",true,"SOAP-ENV:mustUnderstand","1");
xml.UpdateAttrAt("SOAP-ENV:Body",true,"xmlns:SOAP-SEC","http://schemas.xmlsoap.org/soap/security/2000-12");
xml.UpdateAttrAt("SOAP-ENV:Body",true,"SOAP-SEC:id","Body");
xml.UpdateAttrAt("SOAP-ENV:Body|z:FooBar",true,"xmlns:z","http://example.com");

// Load a JavaKeyStore file containing the certificate + private key.
Chilkat.JavaKeyStore jks = new Chilkat.JavaKeyStore();
string password = "secret";
bool success = jks.LoadFile(password,"qa_data/jks/test_secret.jks");
if (success != true) {
    Debug.WriteLine(jks.LastErrorText);
    return;
}

// Make sure we have a private key.
if (jks.NumPrivateKeys < 1) {
    Debug.WriteLine("No private key available.");
    return;
}

// -------------------------------------------------------------------------
// Get the certificate chain associated with the 1st (and probably only) private key in the JKS.
Chilkat.CertChain chain = jks.GetCertChain(0);
if (jks.LastMethodSuccess != true) {
    Debug.WriteLine(jks.LastErrorText);
    return;
}

Chilkat.Cert cert = chain.GetCert(0);
if (chain.LastMethodSuccess != true) {
    Debug.WriteLine(chain.LastErrorText);

    return;
}

// Verify again that this cert has a private key.
if (cert.HasPrivateKey() != true) {
    Debug.WriteLine("Certificate has no associated private key.");

    return;
}

// Prepare for signing...
// Use this online tool to generate the following code from an already-signed XML sample: 
// Generate Code to Create an XML Signature
Chilkat.XmlDSigGen gen = new Chilkat.XmlDSigGen();

// Indicate where the Signature will be inserted.
gen.SigLocation = "SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security";

// Add a reference to the fragment of the XML to be signed.
gen.AddSameDocRef("Body","sha1","EXCL_C14N","","");

// (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
gen.SignedInfoPrefixList = "wsse SOAP-ENV";

// Provide the private key for signing via the certificate, and indicate that
// we want the base64 of the certificate embedded in the KeyInfo.
gen.KeyInfoType = "X509Data";
gen.X509Type = "Certificate";

// Note: Because our certificate was loaded from a JKS which also contained the private key,
// Chilkat automatically knows and has the private key associated with the certificate.
// We set bUsePrivateKey to tell the SetX509Cert method to automatically use the private key
// associated with the certificate for signing.
bool bUsePrivateKey = true;
success = gen.SetX509Cert(cert,bUsePrivateKey);
if (success != true) {
    Debug.WriteLine(gen.LastErrorText);

    return;
}

// Everything's specified.  Now create and insert the Signature
Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder();
xml.GetXmlSb(sbXml);
success = gen.CreateXmlDSigSb(sbXml);
if (success != true) {
    Debug.WriteLine(gen.LastErrorText);
    return;
}

// Examine the XML with the digital signature inserted
Debug.WriteLine(sbXml.GetAsString());