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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">This is peculiar. This behaviour is documented in the release notes for 1.8.0_151 and 9.0.1, both referencing JDK-8182879 which is not public. There's some discussion of that ticker <a href="http://security-dev.openjdk.java.narkive.com/0q5K94kr/jdk-8182879-add-warnings-to-keytool-when-using-jks-and-jceks" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">here</a> in which Sean Mullan says (in what is probably a bit of an OPSEC fail):</p>
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<p style="margin: 10px 0 0 0; margin-top: 0">I wonder if you should be more specific, ex - "on a JKS or JCEKS<br> keystore containing private or secret key entries". But that might<br> reveal too much.</p>
</blockquote> <p style="margin: 10px 0 0 0">I'm not going to dig further into that.</p> <p style="margin: 10px 0 0 0">I did run a quick test against a number of Java versions I had available, in which I <em>created</em> a new keystore then listed the contents:</p>
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keytool -genkey -alias mydomain -keyalg RSA -keystore keystore.jks -keysize 2048
keytool -list -keystore keystore.jks
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<ul>
<li>1.8.0_151 (OpenJDK via Docker) behaved as described</li>
<li>1.8.0_171 behaved as described</li>
<li>9.0.1 (OpenJDK via Docker) did <em>not</em> generate the warning</li>
<li>9.0.4 did <em>not</em> generate the warning</li>
<li>10.0.1 did <em>not</em> generate the warning</li>
<li>11-ea+21 did <em>not</em> generate the warning</li>
<li>12-ea+2 did <em>not</em> generate the warning</li>
</ul> <p style="margin: 10px 0 0 0">The versions which did not generate the warning generated slightly larger keystores. I think the difference is a SHA-256 based signature as opposed to the SHA-1 based signature generated by 1.8.0_171.</p> <p style="margin: 10px 0 0 0">My second test was to take the keystore generated by 1.8.0_171 and <em>list</em> it using each version above:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
keytool -list -keystore keystore.jks
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</div> <p style="margin: 10px 0 0 0">In this case, <em>all</em> tests gave the warning message.</p> <p style="margin: 10px 0 0 0">I also tried this second test against 8u141 and 9 GA and did <em>not</em> get the warning, as expected.</p> <p style="margin: 10px 0 0 0">Bottom line: I don't think there has been any deprecation of the JKS file format, either in Java 8 or any later version. What seems to have happened is that the warning has been introduced under <em>certain circumstances</em> that are not being explicitly described for some reason. These only apply to keystores <em>generated</em> under Java 8. Keystores created under newer versions of Java don't seem to be affected.</p> </td>
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