diff --git a/easytier/src/peers/peer_ospf_route.rs b/easytier/src/peers/peer_ospf_route.rs
index 18084b21..d766a3fc 100644
--- a/easytier/src/peers/peer_ospf_route.rs
+++ b/easytier/src/peers/peer_ospf_route.rs
@@ -41,7 +41,7 @@ use super::{
 };
 use crate::common::config::ConfigLoader;
 use crate::dns::config::DnsGlobalCtxExt;
-use crate::proto::dns::DeterministicDigest;
+use crate::utils::DeterministicDigest;
 use crate::{
     common::{
         config::NetworkIdentity,
diff --git a/easytier/src/proto/dns.rs b/easytier/src/proto/dns.rs
index 323c1010..22dce587 100644
--- a/easytier/src/proto/dns.rs
+++ b/easytier/src/proto/dns.rs
@@ -1,24 +1,7 @@
-use serde::Serialize;
-use sha2::{Digest, Sha256};
 use std::fmt::Display;
 
 include!(concat!(env!("OUT_DIR"), "/dns.rs"));
 
-pub trait DeterministicDigest: Serialize {
-    fn digest(&self) -> Vec<u8> {
-        let json = serde_json::to_vec(self).expect("failed to serialize the object to json");
-        let mut hasher = Sha256::new();
-        hasher.update(json);
-        hasher.finalize().to_vec()
-    }
-}
-
-impl DeterministicDigest for GetExportConfigResponse {}
-
-impl DeterministicDigest for ZoneConfigPb {}
-
-impl DeterministicDigest for DnsSnapshot {}
-
 impl Display for ZoneConfigPb {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         writeln!(f, "; EasyTier Magic DNS zone file")?;
diff --git a/easytier/src/utils.rs b/easytier/src/utils.rs
index 9612be46..6bfb4941 100644
--- a/easytier/src/utils.rs
+++ b/easytier/src/utils.rs
@@ -1,6 +1,8 @@
 use crate::common::log;
 use indoc::formatdoc;
 use std::{fs::OpenOptions, str::FromStr};
+use serde::Serialize;
+use sha2::{Digest, Sha256};
 
 pub type PeerRoutePair = crate::proto::api::instance::PeerRoutePair;
 
@@ -148,3 +150,14 @@ pub trait BoxExt: Sized {
 }
 
 impl<T> BoxExt for T {}
+
+pub trait DeterministicDigest: Serialize {
+    fn digest(&self) -> Vec<u8> {
+        let json = serde_json::to_vec(self).expect("failed to serialize the object to json");
+        let mut hasher = Sha256::new();
+        hasher.update(json);
+        hasher.finalize().to_vec()
+    }
+}
+
+impl<S: Serialize> DeterministicDigest for S {}