G'day saintmike,

What you're describing for 5.17 development versions, is a documented feature in the current (at time of writing) 5.18 production versions. See "perl5180delta: Hash overhaul".

You can emulate earlier behaviour with the environment variables PERL_HASH_SEED and PERL_PERTURB_KEYS. You might also look at PERL_HASH_SEED_DEBUG, which may be useful for your testing. [Note: I haven't looked at your test suite.]

Be aware of the security implications of modifying the hashing algorithm: "perlsec: Algorithmic Complexity Attacks".

See also: keys and Hash::Util.

-- Ken

In reply to Re: Truly randomized keys() in perl 5.17 - a challenge for testing? by kcott
in thread Truly randomized keys() in perl 5.17 - a challenge for testing? by saintmike

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.