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Changing the Bloom filter hashing so that it's independent of

Browse source 
CompositeHash.

We do this by hashing values added to a BloomFilter another time more
with a stable hash seeded only by either the filter's name or the
global_hash_seed (or Bro's random() seed if neither is defined).

I'm also adding a new bif bloomfilter_internal_state() that returns a
string representation of a Bloom filter's current internal state. This
is solely for writing tests that check that the filters end up
consistent when seeded with the same value.
This commit is contained in:
Robin Sommer 2013-07-31 17:14:02 -07:00
parent 6c197fbebf
commit 2a0790c231
14 changed files with 157 additions and 59 deletions
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7
src/probabilistic/BitVector.h
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@ -276,6 +276,13 @@ public:
*/
size_type FindNext(size_type i) const;
/** Computes a hash value of the internal representation.
* This is mainly for debugging/testing purposes.
*
* @return The hash.
*/
size_t Hash() const;
/**
* Serializes the bit vector.
*