Fix missing urandom by using OpenSSL's random_bytes

config/initializers/00_random.rb

@@ -0,0 +1,32 @@
+# -*- coding: us-ascii -*-
+# frozen_string_literal: true
+
+class Random
+
+  class << self
+
+    private
+    
+    # :stopdoc:
+
+    # Implementation using OpenSSL
+    def gen_random_openssl(n)
+      return OpenSSL::Random.random_bytes(n)
+    end
+
+    begin
+      # Check if Random.urandom is available
+      Random.urandom(1)
+    rescue RuntimeError
+      begin
+        require 'openssl'
+      rescue NoMethodError
+        raise NotImplementedError, "No random device"
+      else
+        alias urandom gen_random_openssl
+      end
+    end
+
+    public :urandom
+  end
+end