当然,Ruby还没有复活一个18岁的小虫.我在这里想念的是什么？

编辑：这是random_bytes的来源.请注意第一次检查是否使用OpenSSL编译ruby,在这种情况下,它会使用pid和当前时间对其进行种子处理.

def self.random_bytes(n=nil)
  n = n ? n.to_int : 16

  if defined? OpenSSL::Random
    @pid = 0 if !defined?(@pid)
    pid = $$
    if @pid != pid
      now = Time.now
      ary = [now.to_i,now.nsec,@pid,pid]
      OpenSSL::Random.seed(ary.to_s)
      @pid = pid
    end
    return OpenSSL::Random.random_bytes(n)
  end

  if !defined?(@has_urandom) || @has_urandom
    flags = File::RDONLY
    flags |= File::NONBLOCK if defined? File::NONBLOCK
    flags |= File::NOCTTY if defined? File::NOCTTY
    begin
      File.open("/dev/urandom",flags) {|f|
        unless f.stat.chardev?
          raise Errno::ENOENT
        end
        @has_urandom = true
        ret = f.readpartial(n)
        if ret.length != n
          raise NotImplementedError,"Unexpected partial read from random device: only #{ret.length} for #{n} bytes"
        end
        return ret
      }
    rescue Errno::ENOENT
      @has_urandom = false
    end
  end

  if !defined?(@has_win32)
    begin
      require 'Win32API'

      crypt_acquire_context = Win32API.new("advapi32","CryptAcquireContext",'PPPII','L')
      @crypt_gen_random = Win32API.new("advapi32","CryptGenRandom",'LIP','L')

      hProvStr = " " * 4
      prov_rsa_full = 1
      crypt_verifycontext = 0xF0000000

      if crypt_acquire_context.call(hProvStr,nil,prov_rsa_full,crypt_verifycontext) == 0
        raise SystemCallError,"CryptAcquireContext Failed: #{lastWin32ErrorMessage}"
      end
      @hProv,= hProvStr.unpack('L')

      @has_win32 = true
    rescue LoadError
      @has_win32 = false
    end
  end
  if @has_win32
    bytes = " ".force_encoding("ASCII-8BIT") * n
    if @crypt_gen_random.call(@hProv,bytes.size,bytes) == 0
      raise SystemCallError,"CryptGenRandom Failed: #{lastWin32ErrorMessage}"
    end
    return bytes
  end

  raise NotImplementedError,"No random device"
end