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authorGiuseppe D'Angelo <dangelog@gmail.com>2012-03-24 08:50:02 +0000
committerQt by Nokia <qt-info@nokia.com>2012-04-04 13:02:58 +0200
commit9a77171ccc2838c2fd7b666ed9ee9c7ba8ebd488 (patch)
treec2b090636b77d3019b3da9389c596d3753b526f7 /doc/src/network
parentfb20f9c2da369b07fc50857a90b596ae63f943da (diff)
QHash security fix (1.5/2): qHash two arguments overload support
Algorithmic complexity attacks against hash tables have been known since 2003 (cf. [1, 2]), and they have been left unpatched for years until the 2011 attacks [3] against many libraries / (reference) implementations of programming languages. This patch adds a qHash overload taking two arguments: the value to be hashed, and a uint to be used as a seed for the hash function itself (support the global QHash seed was added in a previous patch). The seed itself is not used just yet; instead, 0 is passed. Compatibility with the one-argument qHash(T) implementation is kept through a catch-all template. [1] http://www.cs.rice.edu/~scrosby/hash/CrosbyWallach_UsenixSec2003.pdf [2] http://perldoc.perl.org/perlsec.html#Algorithmic-Complexity-Attacks [3] http://www.ocert.org/advisories/ocert-2011-003.html Task-number: QTBUG-23529 Change-Id: I1d0a84899476d134db455418c8043a349a7e5317 Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
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