lib/securerandom.rb: Fix the check of availability of Random.urandom

Random.urandom raises a RuntimeError if it is unavailable. [Bug #13885]
ruby · Feb 16, 2022 · b9851c7 · b9851c7
1 parent e7d76fe
commit b9851c7
Showing 1 changed file with 5 additions and 4 deletions.
diff --git a/lib/securerandom.rb b/lib/securerandom.rb
@@ -72,17 +72,18 @@ def gen_random_urandom(n)
       ret
     end
 
-    ret = Random.urandom(1)
-    if ret.nil?
+    begin
+      # Check if Random.urandom is available
+      Random.urandom(1)
+      alias gen_random gen_random_urandom
+    rescue RuntimeError
       begin
         require 'openssl'
       rescue NoMethodError
         raise NotImplementedError, "No random device"
       else
         alias gen_random gen_random_openssl
       end
-    else
-      alias gen_random gen_random_urandom
     end
 
     public :gen_random