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Message from discussion branch yves/rand_hash_seed, updated. v5.17.5-144-g2114e3a
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"Yves Orton"  
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 More options Nov 4 2012, 7:30 am
Newsgroups: perl.perl5.changes
From: demer...@gmail.com ("Yves Orton")
Date: Sun, 04 Nov 2012 13:23:39 +0100
Local: Sun, Nov 4 2012 7:23 am
Subject: [perl.git] branch yves/rand_hash_seed, updated. v5.17.5-144-g2114e3a
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In perl.git, the branch yves/rand_hash_seed has been updated

<http://perl5.git.perl.org/perl.git/commitdiff/2114e3a5fb824644dce471a...>

- Log -----------------------------------------------------------------
commit 2114e3a5fb824644dce471ac1dec03997f09f51a
Author: Yves Orton <demer...@gmail.com>
Date:   Sun Nov 4 13:23:15 2012 +0100

    document siphash origins
-----------------------------------------------------------------------

Summary of changes:
 hv.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/hv.h b/hv.h
index 44189f4..88753d3 100644
--- a/hv.h
+++ b/hv.h
@@ -147,6 +147,20 @@ struct xpvhv {
 #if defined(PERL_HASH_FUNC_SIPHASH)
 #define PERL_HASH_FUNC "SIPHASH"

+/* This is SipHash by Jean-Philippe Aumasson and Daniel J. Bernstein.
+ * The authors claim it is relatively secure compared to the alternatives
+ * and that performance wise it is a suitable hash for languages like Perl.
+ * See:
+ *
+ * https://www.131002.net/siphash/
+ *
+ * This implementation seems to perform slightly slower than one-at-a-time for
+ * short keys, but degrades slower for longer keys. Murmur Hash outperforms it
+ * regardless of keys size.
+ *
+ * It is 64 bit only.
+ */
+
 #define PERL_HASH_NEEDS_TWO_SEEDS

 #ifndef U64

--
Perl5 Master Repository


 
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