Cert Expiration Date in Jar Files

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Joe - 22 Nov 2005 11:51 GMT

Is there any way to reveal the expiration date of the digital
certificate used to sign a jar file - by only having the signed
jar file available?

Joe

P.S. Please also e-mail to joe_@_mcmahon.com after removing the
underscores from my e-mail address. Thanks.

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Ben_ - 22 Nov 2005 13:03 GMT

It's likely all certificate information is in the jar:
"
The Signature Block (.DSA) File
The .SF file is signed and the signature is placed in the .DSA file. The
.DSA file also contains, encoded inside it, the certificate or certificate
chain from the keystore which authenticates the public key corresponding to
the private key used for signing.
"
http://java.sun.com/j2se/1.5.0/docs/tooldocs/solaris/jarsigner.html

jarsigner -verify -verbose -certs my.jar will display some details but not
all.

Maybe it requires a bit of programming to get the information you want ?

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