Class: SuperRandom

Inherits:
Object
  • Object
show all
Defined in:
lib/super_random.rb,
lib/super_random/super_random.rb

Constant Summary collapse

VERSION = 
'1.0.0'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SuperRandom

Returns a new instance of SuperRandom.



53
54
55
56
57
58
59
 
# File 'lib/super_random/super_random.rb', line 53

def initialize
  @first_timeout = 3
  @second_timeout = 6
  @nevermind = true
  @randomness = 0.0
  @services = 0
end

Instance Attribute Details

#first_timeout ⇒ Object

Returns the value of attribute first_timeout.



50
51
52
 
# File 'lib/super_random/super_random.rb', line 50

def first_timeout
  @first_timeout
end

#nevermind ⇒ Object

Returns the value of attribute nevermind.



50
51
52
 
# File 'lib/super_random/super_random.rb', line 50

def nevermind
  @nevermind
end

#randomness ⇒ Object (readonly)

Returns the value of attribute randomness.



51
52
53
 
# File 'lib/super_random/super_random.rb', line 51

def randomness
  @randomness
end

#second_timeout ⇒ Object

Returns the value of attribute second_timeout.



50
51
52
 
# File 'lib/super_random/super_random.rb', line 50

def second_timeout
  @second_timeout
end

#services ⇒ Object (readonly)

Returns the value of attribute services.



51
52
53
 
# File 'lib/super_random/super_random.rb', line 51

def services
  @services
end

Class Method Details

.atmospheric(n) ⇒ Object 



15
16
17
18
19
20
21
22
23
24
25
 
# File 'lib/super_random/super_random.rb', line 15

def self.atmospheric(n)
  s = Net::HTTP.get(URI(
    "https://www.random.org/integers/?num=#{n}&min=0&max=255&col=1&base=10&format=plain&rnd=new"))
  a = s.strip.split(/\s+/).map{|j|j.to_i}
  raise unless a.length==n
  raise unless a.all?{|i| i>-1 and i<256}
  return a
rescue StandardError
  warn "atmospheric (www.random.org) failed."
  return nil
end

.entropy_pool(n) ⇒ Object 



27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/super_random/super_random.rb', line 27

def self.entropy_pool(n)
  s = Net::HTTP.get(URI(
    "http://random.hd.org/getBits.jsp?numBytes=#{n}&type=bin"))
  a = s.bytes
  # As of the time of this writting, not guaranteed to get more than 8 bytes.
  raise unless (n>8)? a.length.between?(8,n) : a.length==n
  return a
rescue StandardError
  warn "entropy_pool (random.hd.org) failed."
  return nil
end

.hotbits(n, k = 'Pseudorandom') ⇒ Object 



39
40
41
42
43
44
45
46
47
48
 
# File 'lib/super_random/super_random.rb', line 39

def self.hotbits(n, k='Pseudorandom')
  s = Net::HTTP.get(URI(
    "https://www.fourmilab.ch/cgi-bin/Hotbits.api?nbytes=#{n}&fmt=bin&apikey=#{k}"))
  a = s.bytes
  raise unless a.length==n
  return a
rescue StandardError
  warn "hotbits (www.fourmilab.ch) failed."
  return nil
end

.quantum(n) ⇒ Object 



3
4
5
6
7
8
9
10
11
12
13
 
# File 'lib/super_random/super_random.rb', line 3

def self.quantum(n)
  s = Net::HTTP.get(URI(
    "https://qrng.anu.edu.au/API/jsonI.php?length=#{n}&type=uint8"))
  a = JSON.parse(s)['data']
  raise unless a.is_a?(Array) and a.length==n
  raise unless a.all?{|i| i.is_a?(Integer) and i>-1 and i<256}
  return a
rescue StandardError
  warn "quantum (qrng.anu.edu.au) failed."
  return nil
end

Instance Method Details

#bytes(n = 32) ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
 
# File 'lib/super_random/super_random.rb', line 61

def bytes(n=32)
  @randomness = 0.0
  @services = 0

  a1 = a2 = a3 = a4 = nil

  t1 = Thread.new{ a1 = SuperRandom.quantum(n)}
  t2 = Thread.new{ a2 = SuperRandom.atmospheric(n)}
  t3 = Thread.new{ a3 = SuperRandom.entropy_pool(n)}
  t4 = Thread.new{ a4 = SuperRandom.hotbits(n)}

  begin
    Timeout.timeout(@first_timeout) do
      # Initially, would like to get them all.
      t1.join and t2.join and t3.join and t4.join
    end
  rescue Timeout::Error
    begin
      Timeout.timeout(@second_timeout) do
        # But at this point,
        # would like to get at least one.
        while a1.nil? and a2.nil? and a3.nil? and a4.nil?
            (t1.alive? or t2.alive? or t3.alive? or t4.alive?)
          Thread.pass
        end
      end
    rescue Timeout::Error
      # If we don't care that we got nothing, go on.
      raise $! unless @nevermind
    end
  end

  a = n.times.inject([]){|b,i|b.push(SecureRandom.random_number(256))}
  [a1, a2, a3, a4].each do |b|
    if b
      bl = b.length
      @randomness += bl.to_f/n.to_f
      @services += 1
      n.times{|i|a[i]=(a[i]+b[i%bl])%256}
    end
  end

  return a
end

#hexadecimal(n = 32) ⇒ Object 



106
107
108
 
# File 'lib/super_random/super_random.rb', line 106

def hexadecimal(n=32)
  bytes(n).map{|i|i.to_s(16).rjust(2,'0')}.join
end

#rand(m = nil, n = 6) ⇒ Object 



110
111
112
113
114
 
# File 'lib/super_random/super_random.rb', line 110

def rand(m=nil, n=6)
  div = n.times.inject(''){|s,i| s+'FF'}.to_i(16).to_f
  r = hexadecimal(n).to_i(16).to_f / div
  m.nil? ? r : (m*r).to_i
end