Using a ECDSA Certifcate to Digtially Sign a XML Request

Hi,

I have been trying to work out how to create the following xml structure via the SignedXml class provided by the framework. The issue that I have is that the certificate type is an ECDSA one and from my research it is not widely supported like RSA and DSA is.

I have attempted to use the ECDsaCng class as the key algorithm via my own implementations of SignatureDescription, AsymmetricSignatureFormatter and AsymmetricSignatureDeformatter and I can sign and verify my own Xml. However when the xml is sent to a third party (who uses Java) it does not verify on their side (using the public key).

The below XML is inserted immediately after the body tag.

 <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
     <SignedInfo>
         <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n# "/>
         <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256"/>
         <Reference URI="">
           <Transforms>
             <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
           </Transforms>
           <DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
           <DigestValue>tOyRD3mq3MFXHUWDfgRVHzqN0Dt5kOzE1rxuJ7FYAjI=</DigestValue>
         </Reference>
       </SignedInfo>
      <SignatureValue>hfluuINc7W/+8fklmrXKoW+M9JM4RR1YdnGp15Y8CXd7hXY717srDT6lAkNWSIWY8d5UFVHx9jd4HeTJ3GLzxQ==</SignatureValue>
       <KeyInfo>
         <X509Data>
           <X509IssuerSerial>
             <X509IssuerName>CN=XXXXXX, OU=XXXX XXXX, O=XXXX XXXX, C=UK</X509IssuerName>
             <X509SerialNumber>123123123</X509SerialNumber>
           </X509IssuerSerial>
         </X509Data>
       </KeyInfo>
   </Signature>

I'm willing to post all of my code somewhere for Microsoft to look at, just don't know where.

Can a signature by created as above with ECDSA?

Regards,

Hyder