CODEWITHSUNDEEP
c#digital-signaturesignedxml
shkipper
shkipper

Reputation: 1413

SignedXml CanonicalizationMethod - http://www.w3.org/2006/12/xml-c14n11

Is it possible to use http://www.w3.org/2006/12/xml-c14n11 CanonicalizationMethod with SignedXml?

SignedXml signedXml = new SignedXml(xmlDoc);
signedXml.SignedInfo.CanonicalizationMethod = "http://www.w3.org/2006/12/xml-c14n11";

is throwing 

System.Security.Cryptography.CryptographicException: Could not create the XML tr
ansformation identified by the URI http://www.w3.org/2006/12/xml-c14n11.

Thank You!

Upvotes: 8

Views: 3728

Answers (2)

riccardo
riccardo

Reputation: 21

The issue is a bit old but I stumbled upon it these days and found the first answer very useful, although to make it work I had to add the namespace of the canonicalization algorithm to the static property SignedXml.KnownCanonicalizationMethods. It's a private property of the standard class, but with a bit of trickery you can add the namespace to the collection anyway like this:

var KnownCanonicalizationMethodsProperty = typeof(SignedXml).GetProperty("KnownCanonicalizationMethods", BindingFlags.NonPublic | BindingFlags.FlattenHierarchy | BindingFlags.Static);

(KnownCanonicalizationMethodsProperty.GetValue(null) as List<string>).Add("http://www.w3.org/2006/12/xml-c14n11");

Upvotes: 0

Todd Liang
Todd Liang

Reputation: 115

Doesn't look like it has been implemented by .NET yet.

https://msdn.microsoft.com/en-us/library/system.security.cryptography.xml.signedinfo.canonicalizationmethod(v=vs.110).aspx

You may have to make your own Transform class like this:

public class XmlDsigC14N11Transform: XmlDsigC14NTransform
    {
        public override void LoadInput(object obj)
        {
            //do something here
            base.LoadInput(obj);
        }

        public override object GetOutput()
        {
            //do something here
            return base.GetOutput();
        }
    }

And map your transform to "http://www.w3.org/2006/12/xml-c14n11".

CryptoConfig.AddAlgorithm(typeof(XmlDsigC14N11Transform), "http://www.w3.org/2006/12/xml-c14n11");

Upvotes: 6

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