restore couch_util:verify call in oauth.
diff --git a/oauth_hmac_sha1.erl b/oauth_hmac_sha1.erl
index 69064ed..35549cf 100644
--- a/oauth_hmac_sha1.erl
+++ b/oauth_hmac_sha1.erl
@@ -8,4 +8,4 @@
   base64:encode_to_string(crypto:sha_mac(Key, BaseString)).
 
 verify(Signature, BaseString, CS, TS) ->
-  Signature =:= signature(BaseString, CS, TS).
+  couch_util:verify(Signature, signature(BaseString, CS, TS)).
diff --git a/oauth_plaintext.erl b/oauth_plaintext.erl
index d8085e0..9544a0a 100644
--- a/oauth_plaintext.erl
+++ b/oauth_plaintext.erl
@@ -7,4 +7,4 @@
   oauth_uri:calate("&", [CS, TS]).
 
 verify(Signature, CS, TS) ->
-  Signature =:= signature(CS, TS).
+  couch_util:verify(Signature, signature(CS, TS)).