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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"><span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://shibboleth.atlassian.net/browse/JSSH-24?atlOrigin=eyJpIjoiY2QwOWUzYjk1MjNlNDQ3MTk1MTNmNTkwNDdjMmQwNjciLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: Default SecureRandom provider may be blocking</a> </span></td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"><p style="margin: 10px 0 0; margin-top: 0">This is a pretty good summary of current state.</p> <p style="margin: 10px 0 0"><a href="https://www.synopsys.com/blogs/software-security/proper-use-of-javas-securerandom/" title="smart-link" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://www.synopsys.com/blogs/software-security/proper-use-of-javas-securerandom/</a></p> <p style="margin: 10px 0 0">Notably, they added yet more settings in java.security for dealing with this.</p> <p style="margin: 10px 0 0">Possibly not new, but securerandom.source is there to point to the secure entropy source, but the claim (unproven) is that the NativePRNGBlocking provider doesn’t honor it (this seems kind of hard to believe).</p> <p style="margin: 10px 0 0">In addition, the trigger for getInstanceStrong is this line:</p>
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<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">securerandom.strongAlgorithms=NativePRNGBlocking:SUN,DRBG:SUN</pre>
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</div> <p style="margin: 10px 0 0">So it’s still possible to control it, but it’s clear that using the constructor alone is better, and you get NativePRNG (or the SHA1 version on Windows), and that only blocks on the seed and honors the property to point to non-blocking sources.</p> <p style="margin: 10px 0 0">The upshot is we’re doing it right now, but need to ensure we can control the provider at runtime in the event they screw with this again.</p></td>
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