Support for the Ruby 2.4 series has ended. See here for reference.
This library is an interface to secure random number generators which are suitable for generating session keys in HTTP cookies, etc.
You can use this library in your application by requiring it:
require 'securerandom'
It supports the following secure random number generators:
openssl
/dev/urandom
Win32
Generate random hexadecimal strings:
require 'securerandom' p SecureRandom.hex(10) #=> "52750b30ffbc7de3b362" p SecureRandom.hex(10) #=> "92b15d6c8dc4beb5f559" p SecureRandom.hex(13) #=> "39b290146bea6ce975c37cfc23"
Generate random base64 strings:
p SecureRandom.base64(10) #=> "EcmTPZwWRAozdA==" p SecureRandom.base64(10) #=> "KO1nIU+p9DKxGg==" p SecureRandom.base64(12) #=> "7kJSM/MzBJI+75j8"
Generate random binary strings:
p SecureRandom.random_bytes(10) #=> "\016\t{\370g\310pbr\301" p SecureRandom.random_bytes(10) #=> "\323U\030TO\234\357\020\a\337"
Generate UUIDs:
p SecureRandom.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594" p SecureRandom.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
# File securerandom.rb, line 51 def self.gen_random(n) @pid = 0 unless defined?(@pid) pid = $$ unless @pid == pid now = Process.clock_gettime(Process::CLOCK_REALTIME, :nanosecond) OpenSSL::Random.random_add([now, @pid, pid].join(""), 0.0) seed = Random.raw_seed(16) if (seed) OpenSSL::Random.random_add(seed, 16) end @pid = pid end return OpenSSL::Random.random_bytes(n) end