diff --git a/auth_server.lua b/auth_server.lua
index 219a568..229147f 100644
--- a/auth_server.lua
+++ b/auth_server.lua
@@ -25,14 +25,23 @@ function load_data()
 end
 
 function generate_token(user)
-    local token = textutils.sha256(user .. os.time() .. math.random())
+    local token = hash(user .. os.time() .. math.random())
     data.users[user].token = token
 
     return token
 end
 
 function convert_password(password)
-    return textutils.sha256(password .. "3m&LmNm7")
+    return hash(password .. "3m&LmNm7")
+end
+
+-- Does a simple hash of a string
+function hash(str)
+    local hash = 0
+    for i = 1, #str do
+        hash = hash + string.byte(str, i)
+    end
+    return hash
 end
 
 load_data()