How to verify a jar signed with jarsigner programmatically

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I'm wanting to sign a jar using jarsigner, then verify it using a Java application which does not have the signed jar as part of it's classpath (i.e. just using a filesystem location of the jar)

Now my problem is getting the signature file out of the jar, is there a simple way to do this?

I've had a play with the Inflater and Jar InputStreams with no luck.

Or is this something that can be accomplished in a better way?

Thanks

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