RE: embed digital signature in XML

[Lei Chen]

Title: RE: create/serialize sub-documents

One example of the encoded signature is like following:

 

MCwCFASCEpl54HrKa+8EW55HX6m/GJGVAhQCTk2wyDl8ftru+9Zgl70ZVN/CsQ==

 

-----Original Message-----
From: Lei Chen
Sent: Monday, April 02, 2001 12:40 PM
To: '[EMAIL PROTECTED]'
Subject: RE: embed digital signature in XML

I tried both encode(byte[]) and encodeBuffer(byte[]) of sun.misc.BASE64Encode, but I am still getting the same exception. Here is the code:

 

                  byte[] data = "">                  byte[] sig = signature.sign(data);

                   ...
                   Element root = doc.createElement("top");
                   doc.appendChild(root);
                   ...

                  sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

                  String encodedSig = encoder.encodeBuffer(sig);
                   root.appendChild (
doc.createProcessingInstruction("DigSign" + encodedSig, null) );

What kind of character is allowed in processing instructions?

 

-Lei

 

-----Original Message-----
From: Mark Sizer [mailto:[EMAIL PROTECTED]
Sent: Monday, April 02, 2001 12:18 PM
To: '[EMAIL PROTECTED]'
Subject: RE: embed digital signature in XML

I base64 encode my digital signatures before stuffing them into XML - it works fine.

 

I'm using an open-source package from Germany, but I believe there is a base64 encoder/decoder buried in the Xerces packages somewhere. If not, Sun has one, too.

-----Original Message-----
From: Lei Chen [mailto:[EMAIL PROTECTED]
Sent: Monday, April 02, 2001 9:42 AM
To: '[EMAIL PROTECTED]'
Subject: embed digital signature in XML

Hi folks,

I am trying to embed a digital signature into a XML document as processing
instructions like following:

                  <top>
                      <contract>
                            ...
                      </contract>
                      <?DigSignA234B5678E897?>
                   </top>

The signature was generated by using 'byte[] Signature.sign(bye[])' from
java.security package. However, when I ran following code:

                  ...
                  byte[] data = "">                  byte[] sig = signature.sign(data);
                   ...
                   Element root = doc.createElement("top");
                   doc.appendChild(root);
                   ...
                   root.appendChild (
doc.createProcessingInstruction("DigSign" + new String(sig), null) );

I got

java.lang.InstantiationError: org/w3c/dom/DOMException

 at org.apache.xerces.dom.DocumentImpl.createProcessingInstruction(DocumentImpl.java:566)

If I switch to sun's crimson parser, the error message is more informative:

org.apache.crimson.tree.DomEx: INVALID_CHARACTER_ERR: An invalid character was specified, such as in a name.

 at org.apache.crimson.tree.XmlDocument.createProcessingInstruction(XmlDocument.java:984)

I guess some kind of encoding has to be done to the signature byte array before I construct the
String and pass it to this method. But I don't know how to do it. Can somebody point it out?

thanx in advance
-Lei