xmld digital signature RSS

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  adrianrpd20

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  18 Posts

  xmld digital signature

  Feb 27, 2013 09:51 AM|LINK

  I am facing an issue and cannot figure out what i am missing.I am calculating a digital signature in c# and cannot get the right signature value.Does anybody know if signature prefix can change the signature value? My webservice wants a "ds" prefix and what i do fom code is to calculate the signature and after that add the prefix.Could this be the problem? My digest value is the right one but the signature value is different.Is it necessary to first set the prefix and after that calculate the signature? Thanks!

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  Pengzhen Son...

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  8189 Points

  842 Posts

  Microsoft

  Re: xmld digital signature

  Feb 28, 2013 01:35 AM|LINK

  HI,

  Try this about setprefix

  private void SetPrefix(String prefix, XmlNode node) {
          foreach (XmlNode n in node.ChildNodes)
          {
              SetPrefix(prefix, n);
              n.Prefix = prefix;
          }
      }

  For detailed information, you can refer here

  http://stackoverflow.com/questions/12219232/xml-signature-ds-prefix

  http://stackoverflow.com/questions/381517/net-signed-xml-prefix

  Hope it can help you.

  Please mark the replies as answers if they help or unmark if not.
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  adrianrpd20

  Member

  1 Points

  18 Posts

  Re: xmld digital signature

  Mar 04, 2013 09:04 AM|LINK

  Thanks!

  Still not able to figure this out.

  I think that setprefix function  can set the prefix after calculating the signature ....and i need it before to each tag from signedInfo.

  Altough i am not sure how i can do this .

  Here is my code.I need to set the prefix before calling compute signature i think.

   SignedXmlWithId signedXml = new SignedXmlWithId(xmldoc);
              
             
  
              signedXml.SignedInfo.SignatureMethod = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
              signedXml.SignedInfo.CanonicalizationMethod = SignedXml.XmlDsigExcC14NTransformUrl;
             
              
              XmlDsigExcC14NTransform canMethod = (XmlDsigExcC14NTransform)signedXml.SignedInfo.CanonicalizationMethodObject;
              canMethod.InclusiveNamespacesPrefixList = "idp soapenv spg";
            
              // signedXml.KeyInfo.AddClause(new System.Security.Cryptography.Xml.KeyInfoX509Data(cer));
              Reference tRef = new Reference("#id-20");
             // XmlDsigEnvelopedSignatureTransform env1 = new XmlDsigEnvelopedSignatureTransform();
             // XmlDsigExcC14NWithCommentsTransform env1 = new XmlDsigExcC14NWithCommentsTransform();
              XmlDsigExcC14NTransform env = new XmlDsigExcC14NTransform("idp spg");
              env.Algorithm = "http://www.w3.org/2001/10/xml-exc-c14n#";
              tRef.DigestMethod = "http://www.w3.org/2000/09/xmldsig#sha1";
                    
              
              tRef.AddTransform(env);
             
             signedXml.AddReference(tRef);
             signedXml.SigningKey = cer.PrivateKey;
  
                             signedXml.ComputeSignature();
              
              XmlElement xmlDsig = signedXml.GetXml();
              xmlDsig.SetAttribute("Id", "Signature-5");