LGPL possible for SHA-1 provider?

[Harald Albrecht]

Hello classpath developers,

I'm the maintainer of an ONC/RPC package for Java, which is available 
under the LGPL (acplt.org/ks/remotetea.html). Within the jrpcgen 
protocol compiler, which is part of this ONC/RPC package, I would like 
to use the implementation of SHA-1 just to create serialization UIDs for 
the classes generated by the protocol compiler.

The classpath package provides an implementation of SHA-1 in 
gnu.java.security.provider.SHA. For the purposes of the jrpcgen protocol 
compiler I would like to use the SHA class, with special adaption to the 
protocol compiler, that is, I want to remove general parts that are not 
necessary in this particular situation. The changed implementation would 
then be moved to a different package (of course).

The SHA implementation in classpart is provided under the GPL. However, 
my package is distributed under the terms of the LGPL. I'm not sure 
whether the additional clause

  As a special exception, if you link this library
  with other files to produce an executable, this
  library does not by itself cause the resulting
  executable to be covered by the GNU General Public
  License

mentioned in the SHA.java source file would allow me to distribute a 
modified version together with the LGPL'd ONC/RPC package without 
running into legal (and social) problems (especially regarding jar files 
containing the class code).

Is it possible to get permission from the classpath developers to 
distribute a modified SHA.java, probably under the LGPL?

Thank you very much,
  Harald

--
Harald Albrecht
Chair of Process Control Engineering
RWTH Aachen University of Technology
Turmstrasse 46, D-52064 Aachen, Germany
Tel.: +49 241 80-7703, Fax:  +49 241 8888-238