Digest::SipHash
Digest::SipHash is a class of message digest use algorithm SipHash.
Usage
require 'digest/siphash'
p Digest::SipHash.digest("siphash") #=> "\x59\xca\xae\xb9\x0d\x54\x24\x64"
p Digest::SipHash.hexdigest("siphash") #=> "59caaeb90d542464"you can change seed string(128bits).
seed default value is SipHash::DEFAULT_SEED ("\x00" * 16)
seed = (0..0x0f).to_a.pack("C16")
p Digest::SipHash.digest("siphash", seed) #=> "\x88\x27\x68\x57\x0d\xc7\x1c\x92"
p Digest::SipHash.hexdigest("siphash", seed) #=> "882768570dc71c92"and other way. instance use.
siphash = Digest::SipHash.new
siphash.update "siphash"
p siphash.hexdigest #=> "59caaeb90d542464"
# of course, can change seed value.
siphash.seed = (0..0x0f).to_a.pack("C16")
p siphash.hexdigest #=> "882768570dc71c92"Installation
Add this line to your application's Gemfile:
gem 'digest-siphash'
And then execute:
$ bundle
Or install it yourself as:
$ gem install digest-siphash
Simple benchmark
#! /usr/bin/env ruby
require 'benchmark'
require 'digest/md5'
require 'digest/sha1'
require 'digest/murmurhash'
require 'digest/siphash'
include Digest
n = 1000
str = "teststrings" * 1024 * 10
Benchmark.bm do |f|
[MurmurHash1, MurmurHash2, MurmurHash64A, SipHash, MD5, SHA1].each do |klass|
f.report(klass.to_s) {
i = 0
while i < n
klass.digest(str)
i += 1
end
}
end
end user system total real
Digest::MurmurHash1 0.050000 0.000000 0.050000 ( 0.045282)
Digest::MurmurHash2 0.030000 0.000000 0.030000 ( 0.032420)
Digest::MurmurHash64A 0.020000 0.000000 0.020000 ( 0.015310)
Digest::SipHash 0.070000 0.000000 0.070000 ( 0.068238)
Digest::MD5 0.150000 0.000000 0.150000 ( 0.149649)
Digest::SHA1 0.130000 0.000000 0.130000 ( 0.133704)