Adding a KeyInfo Link in a SOAP Request

Question

So I have a very similar problem to this post. SOAP KeyInfo Values

I want to add a link to KeyInfo, but I cannot find a way to do this using code.

Here's what should be expected:

<KeyInfo>
    <wsse:SecurityTokenReference>
        <wsse:Reference URI="#SecurityTest" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/>
    </wsse:SecurityTokenReference>
</KeyInfo>

And I have this above where it tries to reference:

<wsse:BinarySecurityToken ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" 
        EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" 
        xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" 
        wsu:Id="SecurityTest">Base64CertStuffBlahblah
</wsse:BinarySecurityToken>

Each attempt to create a KeyInfo part allows me to insert an element, such as a key, to populate this part, but I just want a link. This code is what I worked with, but not creating what I want at the moment.

//This creates a X509 clause but it as far as I've got. 
//The "keyInfoData" needs to be of a different type to allow custom reference?
var signer = new SignedXmlWithId(doc) {SigningKey = Key};
KeyInfo keyInfo = new KeyInfo();
KeyInfoX509Data keyInfoData = new KeyInfoX509Data();
keyInfoData.AddCertificate(cert);
keyInfo.AddClause(keyInfoData);
signer.KeyInfo = keyInfo;

Thanks for watching, any help would be appreciated.

Answer 1

So, this piece of code allows me to add what I want to the KeyInfo part.

KeyInfo keyInfo = new KeyInfo();
XmlElement x = doc.CreateElement("wsse","SecurityTokenReference", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
XmlElement y = doc.CreateElement("wsse","Reference", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
y.SetAttribute("URI","#SecurityTest");
y.SetAttribute("ValueType", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3");
x.AppendChild(y);
var keyInfoData = new KeyInfoNode(x);
keyInfo.AddClause(keyInfoData);
signer.KeyInfo = keyInfo;

:

<KeyInfo>
    <wsse:SecurityTokenReference>
        <wsse:Reference URI="#SecurityTest" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" />
    </wsse:SecurityTokenReference>
</KeyInfo>

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