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From Stefan Bodewig <>
Subject Re: [signjar] prevent double signing
Date Thu, 04 Nov 2004 14:52:50 GMT
On Thu, 4 Nov 2004, Ivan Ivanov <> wrote:

> Actually, there *is* a method called isSigned(File) that checks
> whether a jar is signed, so what you want *is* possible.

A signed jar contains the signature in a file named ALIAS.SF (ALIAS is
a placeholder here) inside of the META-INF directory.  All the code in
signjar does is checking for this file.

It doesn not check whether the file contains anything useful or the
signature is valid.

> not I am sure whether this method is in older versions of
> Ant.

Should have been in there for longer.  Let's see
has been added for Ant 1.4.


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