Merge pull request #83 from tobiashm/patch-1

Avoid checking ancestors for constant

Author: dennisreimann

lib/openid/cryptutil.rb

@@ -37,7 +37,7 @@ def CryptUtil.sha1(text)
     end
 
     def CryptUtil.hmac_sha1(key, text)
-      if Digest.const_defined? :HMAC
+      if Digest.const_defined? :HMAC, false
         Digest::HMAC.new(key,Digest::SHA1).update(text).digest
       else
         return HMAC::SHA1.digest(key, text)
@@ -49,7 +49,7 @@ def CryptUtil.sha256(text)
     end
 
     def CryptUtil.hmac_sha256(key, text)
-      if Digest.const_defined? :HMAC
+      if Digest.const_defined? :HMAC, false
         Digest::HMAC.new(key,Digest::SHA256).update(text).digest
       else
         return HMAC::SHA256.digest(key, text)