JScript Source: sign.js

[This sample code uses features that were implemented in MSXML 5.0 for Microsoft Office Applications. XML digital signatures are not supported in MXSML 6.0 and later.]

var xmldoc, xmldsig, infile;
var szResult = "";

NOKEYINFO = 0;
KEYVALUE  = 1;
CERTIFICATES = 2;
PURGE     = 4;

DSIGNS = "xmlns:ds='http://www.w3.org/2000/09/xmldsig#'";
PROV_RSA_FULL = 1;
// Change this key container name to your own if necessary.
RSA_KEY = "MyRSAFullKeys";

csp = PROV_RSA_FULL;
key = RSA_KEY;
infile = "signature_template.sign.rsa.xml";


if (InitXML()) 
{

  if (LoadXML(infile)) {

   alert("Sign with fwWriteKeyInfo = NOKEYINFO:");
    SignXML(NOKEYINFO);

   alert("Sign with fwWriteKeyInfo = KEYVALUE:");
    SignXML(KEYVALUE|PURGE);

   alert("Sign with fwWriteKeyInfo = CERTIFICATES:");
    SignXML(CERTIFICATES);

   alert("Sign with fwWriteKeyInfo = CERTIFICATES|PURGE:");
    SignXML(CERTIFICATES|PURGE);

   alert("Sign with fwWriteKeyInfo = PURGE:");
    SignXML(PURGE);
  }

}

/////////  Helper functions. /////////
function alert(str) { WScript.echo(str); } 

///////// Set the signature for signing. ////////
function InitXML()
{
   try {
     xmldoc = new ActiveXObject("Msxml2.DOMDOcument.5.0");
     xmldsig= new ActiveXObject("Msxml2.MXDigitalSignature.5.0");
   }
   catch (e) {
     alert("Installation of mxsml5 is required to run this app.\n");
     return false;
   }
   
   xmldoc.async = false;
   xmldoc.preserveWhiteSpace = true;
   xmldoc.validateOnParse = false;
   xmldoc.resolveExternals = false;
   return true;
}

function LoadXML(file)
{
   if (xmldoc == null) {
     alert("must instantiate xml dom\n");
     return false;
   }
  
   if (!xmldoc.load(file)) {
     alert("Can't load "+ file + "\n");
     return false;
   }
   xmldoc.setProperty("SelectionNamespaces", DSIGNS);
   xmldsig.signature = xmldoc.selectSingleNode(".//ds:Signature");
   return true;
}

function SignXML(fwWriteKeyInfo)
{
   if (!xmldsig.signature) 
   {
      alert("Invalid signature template\n");
      return false;
   }

   var oKey = xmldsig.createKeyFromCSP(csp, "", key, 0);
   if (!oKey)
   {
      alert("Invalid key.\n");
      return false;
   }

   var oSignedKey = xmldsig.sign(oKey,fwWriteKeyInfo);
   if (!oSignedKey) 
   {
      alert("sign failed.\n");
      return false;
   }

   alert("The specified data was signed successfully.\n"+
         "Resultant signature:\n"+
         xmldoc.xml + "\n");
   return true;
}

Try It!

1. Ensure that you have completed all the procedures in Getting Started with XML Digital Signatures.

2. Copy the XML signature template from Resource Files, and paste it into a text file. Save the file as signature_template.sign.rsa.xml.

3. Copy the JScript listing above, and paste it into a text file. Save the file as sign.js, in the same directory where you saved signature_template.sign.rsa.xml.

4. From a command prompt, navigate to this directory, then type "cscript sign.js".

   Note

   Under operating systems other than Windows 2000 or Windows XP, you might need to install Windows Scripting Host (to run cscript.exe or wscript.exe), if it is not already installed.

5. Verify that your output is the similar to that listed in the Output topic.