Hi Lei,
After base64 encoding, there are characters (+/=) not allowed for PI
target. I suggest two ways:
1. separate your processing instruction to two parts:
doc.createProcessingInstruction("DigSign", encodedSig) );
2. use Hex encoding (which only uses A~F 0~9, but waste some space) instead
of base64. It would be very easy to implement.
HTH,
Sandy Gao
Software Developer, IBM Canada
(1-416) 448-3255
[EMAIL PROTECTED]
Lei Chen
<[EMAIL PROTECTED] To: "'[EMAIL PROTECTED]'"
<[EMAIL PROTECTED]>
merce.com> cc:
Subject: RE: embed digital
signature in XML
04/02/2001
04:02 PM
Please respond
to
xerces-j-user
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
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