Creating a manifest.mf when generating a jar file.

First post ever using java and its probable really simple. I've basically been chucked in at the deep end of a java app. I've had to reverse engineer it and I'm at the following stage:-
I'm rebuilding the project to create my jar file and I'd like to
1)get a list of all the files of the project within my manifest.mf
2)Digitally sign the files as well, which from what I've read create a *.DSA and *.SF file. The manifest would then have to contain the checksums (SHA1-Digest)
Now I've been playing for a few hours trying to get the manifest to produce the list of files, but with no success all I get is teh default.
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.5
Created-By: 1.5.0_12-b04 (Sun Microsystems Inc.)Any ideas on what I'm missing.
Thanks for any help it will be greatly appricated by a newb with 0% java experience
(taking me a few days to sort out a Ubuntu server to serve the Java apps, but thats working sweet as :D)

got it all working in the end.
Used the following within the jdk/bin folder
keytool - to create a cert
jar - to create the jar file
jarsigner - to create the manifest and sign the files.
I created a load of bat files to do the job.
Now onto the next problem of compiling the java files into class's

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Well, let´s supose your manifest is defined as I did in my previous post. So, your directory base should be something like:
C:\dir
docbaseconnection.jar
dctm.jar
dfc.jar
anotherlibraries.jar
But, let´s supose you want something like
C:\dir
docbaseconnection.jar
lib (folder, which contains dctm.jar, dfc.jar, etc)
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Class-Path: ./lib/dctm.jar ./lib/dfc.jar
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Creating a manifest.mf when generating a jar file.

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