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 cannot be converted to a 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 cannot be converted to a number, then 0 is returned.

Seed conversion¶

After RainerScript converts the seed to a number, that number is converted to an unsigned 32-bit integer before hashing. For values representable as RainerScript numbers, negative seeds and seeds greater than 4294967295 wrap modulo 4294967296. For example, -1 and 4294967295 select the same seed, and 4294967296 selects seed 0. Decimal numeric strings are accepted with the same conversion.

Warning

Default hash implementation is non-crypto.
To use xxhash enable compile time flag.

Example¶

module(load="fmhash")

set $.hash = hash64($!msg!field_1 & $!msg!field_2 & $!msg!field_3)
set $!tag= $syslogtag & $.hash;
//send out