Unable to use MessageDigest

[Richard Udy]

How can I create a MessageDigest in Netscape Navigator?

I have a signed applet that downloads a file to the client's disk, and
needs to verify the data using a java.security.MessageDigest.
Unfortunately Netscape Navigator (4.73) doesn't seem to have this class
(NoClassDefFoundException).
So I tried adding it to the applet. But then I got a security exception
relating to Package Definition - even after enablePrivilege for
"UniversalPackageDefinition".

The saving of the file itself is working fine on both IE and Netsacpe,
and the MessageDigest works fine on IE.

Appreciate any help on this.

Thanks...
Richard Udy