diff options
Diffstat (limited to 'lib/securerandom.rb')
| -rw-r--r-- | lib/securerandom.rb | 57 |
1 files changed, 44 insertions, 13 deletions
diff --git a/lib/securerandom.rb b/lib/securerandom.rb index 9201c9337a..3f8845ea38 100644 --- a/lib/securerandom.rb +++ b/lib/securerandom.rb @@ -1,9 +1,5 @@ # -*- coding: us-ascii -*- # frozen_string_literal: true -begin - require 'openssl' -rescue LoadError -end # == Secure random number generator interface. # @@ -48,8 +44,47 @@ end # module SecureRandom - if defined?(OpenSSL::Random) && /mswin|mingw/ !~ RUBY_PLATFORM - def self.gen_random(n) + @rng_chooser = Mutex.new # :nodoc: + + class << self + def bytes(n) + return gen_random(n) + end + + def gen_random(n) + ret = Random.urandom(n) + if ret.nil? + begin + require 'openssl' + rescue NoMethodError + raise NotImplementedError, "No random device" + else + @rng_chooser.synchronize do + class << self + remove_method :gen_random + alias gen_random gen_random_openssl + end + end + return gen_random(n) + end + elsif ret.length != n + raise NotImplementedError, \ + "Unexpected partial read from random device: " \ + "only #{ret.length} for #{n} bytes" + else + @rng_chooser.synchronize do + class << self + remove_method :gen_random + alias gen_random gen_random_urandom + end + end + return gen_random(n) + end + end + + private + + def gen_random_openssl(n) @pid = 0 unless defined?(@pid) pid = $$ unless @pid == pid @@ -63,9 +98,9 @@ module SecureRandom end return OpenSSL::Random.random_bytes(n) end - else - def self.gen_random(n) - ret = Random.raw_seed(n) + + def gen_random_urandom(n) + ret = Random.urandom(n) unless ret raise NotImplementedError, "No random device" end @@ -75,10 +110,6 @@ module SecureRandom ret end end - - class << self - alias bytes gen_random - end end module Random::Formatter |