SignedXml.CheckSignature(); CryptographicException: Unknown tranform has been encountered

From: Curt Smith (chsmith_at_speakeasy.net)
Date: 09/17/04 

Date: 17 Sep 2004 08:33:49 -0700

I'm a 2 week newbie to VS.NET, .NET, and C# and need help on this time
critical project.

TIA

 
I'm using WSE 1.0sp1/.NET 1.0 and signing and verifying xml documents
not SOAP. So I'm using WSE's SignedXml and getting this exception.

 

My guess ???: machine.config doesn't have the transform
implementation class found for all the namespaces in the <signature>.
 BTW, I'm on XPsp1 and our IT department creates the XP image. There
might be something they strip out of XP?? I did check what CSC's are
install and the MS_ENANCED_PROV seem to be installed. But I wouldn't
know if any are missing.

 

Although I can sign a doc, I can't validate??

 

I started guessing at the transform namespace to impl classes in my
machine.config (end of email).

 

Any thoughts??

 

Thanks Curt

 

 

Exception Details: System.Security.Cryptography.CryptographicException:
Unknown tranform has been encountered.

Source Error:

 

Line 193:

Line 194: XmlNodeList nodeList =
signedDoc.GetElementsByTagName("Signature",
SignedXml.XmlDsigNamespaceUrl);

Line 195:
sx.LoadXml((XmlElement)nodeList[0]);

Line 196:

Line 197: bool isValid =
sx.CheckSignature(key);
 

Source File: c:\inetpub\wwwroot\browserpost\samlutils.cs Line: 195

Stack Trace:

 

[CryptographicException: Unknown tranform has been encountered.]

   Microsoft.Web.Services.Security.Reference.LoadXml(XmlElement value)

   Microsoft.Web.Services.Security.SignedInfo.LoadXml(XmlElement
value)

   Microsoft.Web.Services.Security.SignedXmlSignature.LoadXml(XmlElement
value)

   Microsoft.Web.Services.Security.SignedXml.LoadXml(XmlElement value)

   BrowserPost.SAMLUtils.ValidateDocument(XmlDocument signedDoc,
String keyName) in c:\inetpub\wwwroot\browserpost\samlutils.cs:195

   BrowserPost.TestScenarios.Page_Load(Object sender, EventArgs e) in
c:\inetpub\wwwroot\browserpost\testscenarios.aspx.cs:84

   System.Web.UI.Control.OnLoad(EventArgs e) +67

   System.Web.UI.Control.LoadRecursive() +35

   System.Web.UI.Page.ProcessRequestMain() +720
 

 
-- I just started guesing for the crypto packages...

<mscorlib>

    <cryptographySettings>

      <cryptoNameMapping>

        <cryptoClasses>

          <cryptoClass
exc14n="Microsoft.Web.Services.Security.XmlDsigExcC14NTransform,
Microsoft.Web.Services.Security" />

          <cryptoClass
c14n="System.Security.Cryptography.Xml.XmlDsigC14NTransform,
System.Security.Cryptography.Xml" />

          <cryptoClass
exc14n.comments="Microsoft.Web.Services.Security.XmlDsigExcC14NWithCommentsTransform,
Microsoft.Web.Services.Security" />

          <cryptoClass
envsigTran="System.Security.Cryptography.Xml.XmlDsigEnvelopedSignatureTransform,System.Security.Cryptography.Xml"
/>

          <cryptoClass
digmeth="System.Security.Cryptography.SHA1CryptoServiceProvider,System.Security.Cryptography"
/>

          <!--

          <cryptoClass sigTran="not done
System.Security.Cryptography.Xml.XmlDsigEnvelopedSignatureTransform,System.Security.Cryptography.Xml"
/>

          -->

        </cryptoClasses>

        <nameEntry name="http://www.w3.org/2001/10/xml-exc-c14n#"
class="exc14n" />

        <nameEntry name="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"
class="c14n" />

        <nameEntry name="http://www.w3.org/2001/10/xml-exc-c14n#WithComments"
class="exc14n.comments" />

        <nameEntry name="http://www.w3.org/2000/09/xmldsig#enveloped-signature"
class="envsigTran" />

        <nameEntry name="http://www.w3.org/2000/09/xmldsig#sha1"
class="digmeth" />

        <!--

        <nameEntry name="http://www.w3.org/2000/09/xmldsig#rsa-sha1"
class="sigTran" />

        -->

      </cryptoNameMapping>

    </cryptographySettings>

  </mscorlib>

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