lib/lockbox/key_generator.rb in lockbox-0.2.2 vs lib/lockbox/key_generator.rb in lockbox-0.2.3

@@ -19,10 +19,10 @@
     def hash_hmac(hash, ikm, salt)
       OpenSSL::HMAC.digest(hash, salt, ikm)
     end
 
     def hkdf(ikm, salt:, info:, length:, hash:)
-      if OpenSSL::KDF.respond_to?(:hkdf)
+      if defined?(OpenSSL::KDF.hkdf)
         return OpenSSL::KDF.hkdf(ikm, salt: salt, info: info, length: length, hash: hash)
       end
 
       prk = hash_hmac(hash, ikm, salt)