jnlp - invalid SHA1 signature file digest

Question

I have been trying to verify the Jar signing:

    jarsigner -verify -verbose -certs example.jar

I got the following problem:

jarsigner: java.lang.SecurityException: invalid SHA1 signature file digest for o
rg/apache/log4j/net/DefaultEvaluator.class

I got some suggestions about using -digestalg SHA-1 but I do not know where I should put this statement!

I hope you can help me to fix the problem.

Answer 1

This error can also happen when the jar is signed twice.

The solution was to 'unsign' the jar by deleting *.SF, *.DSA, *.RSA files from the jar's META-INF and then signing the jar again.