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******
HashXX
******
Purpose
=======
Generates hash for a given string.
hash32(literal_string) / hash32(literal_string, seed)
-----------------------------------------------------
Generates a 32 bit hash of the given string.
- Seed is an optional parameter with default = 0.
- If seed is not a valid number, then 0 is returned.
hash64(literal_string) / hash64(literal_string, seed)
-----------------------------------------------------
Generates a 64 bit hash of the given string.
- Seed is an optional parameter with default = 0.
- If seed is not a valid number, then 0 is returned.
.. warning::
- Default hash implementation is non-crypto.
- To use xxhash enable compile time flag.
Example
=======
.. code-block:: none
module(load="fmhash")
set $.hash = hash64($!msg!field_1 & $!msg!field_2 & $!msg!field_3)
set $!tag= $syslogtag & $.hash;
//send out
.. seealso::
:doc:`Hash based sampling<../../tutorials/hash_sampling>`
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