From df00ab1096868b3cffe563c48de5572f78b50392 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Thu, 16 Jan 2014 19:47:35 +0100 Subject: auth: lua string comparisons are time invariant By default, strings are compared by hash, so we can remove this comment. Signed-off-by: Jason A. Donenfeld --- filters/simple-authentication.lua | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua index 5935d08..5c4f074 100644 --- a/filters/simple-authentication.lua +++ b/filters/simple-authentication.lua @@ -45,7 +45,7 @@ function authenticate_post() redirect_to(redirect) - -- TODO: Implement time invariant string comparison function to mitigate timing attack. + -- Lua hashes strings, so these comparisons are time invariant. if password == nil or password ~= post["password"] then set_cookie("cgitauth", "") else @@ -222,7 +222,7 @@ function validate_value(cookie) return nil end - -- TODO: implement time invariant comparison to prevent against timing attack. + -- Lua hashes strings, so these comparisons are time invariant. if hmac ~= crypto.hmac.digest("sha1", value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then return nil end -- cgit