Remove session-cookie-hash annotation

rootfs/etc/nginx/lua/util.lua

@@ -1,8 +1,5 @@
 local string_len = string.len
 local string_sub = string.sub
-local resty_str = require("resty.string")
-local resty_sha1 = require("resty.sha1")
-local resty_md5 = require("resty.md5")
 
 local _M = {}
 
@@ -18,30 +15,6 @@ function _M.get_nodes(endpoints)
   return nodes
 end
 
-local function hash_digest(hash_factory, message)
-  local hash = hash_factory:new()
-  if not hash then
-    return nil, "failed to create object"
-  end
-  local ok = hash:update(message)
-  if not ok then
-    return nil, "failed to add data"
-  end
-  local binary_digest = hash:final()
-  if binary_digest == nil then
-    return nil, "failed to create digest"
-  end
-  return resty_str.to_hex(binary_digest), nil
-end
-
-function _M.sha1_digest(message)
-  return hash_digest(resty_sha1, message)
-end
-
-function _M.md5_digest(message)
-  return hash_digest(resty_md5, message)
-end
-
 -- given an Nginx variable i.e $request_uri
 -- it returns value of ngx.var[request_uri]
 function _M.lua_ngx_var(ngx_var)