diff --git a/spdmlib/src/crypto/crypto_null/hash_impl.rs b/spdmlib/src/crypto/crypto_null/hash_impl.rs
index 0b7d55f..cdbb81f 100644
--- a/spdmlib/src/crypto/crypto_null/hash_impl.rs
+++ b/spdmlib/src/crypto/crypto_null/hash_impl.rs
@@ -24,7 +24,8 @@ fn hash_all(base_hash_algo: SpdmBaseHashAlgo, data: &[u8]) -> Option<SpdmDigestS
 
 #[cfg(feature = "hashed-transcript-data")]
 mod hash_ext {
-    use crate::error::{SpdmResult, SPDM_STATUS_CRYPTO_ERROR};
+    use crate::error::SpdmResult;
+    use crate::protocol::{SpdmBaseHashAlgo, SpdmDigestStruct};
 
     pub fn hash_ctx_update(handle: usize, data: &[u8]) -> SpdmResult {
         unimplemented!()
@@ -41,8 +42,4 @@ mod hash_ext {
     pub fn hash_ctx_init(base_hash_algo: SpdmBaseHashAlgo) -> Option<usize> {
         unimplemented!()
     }
-
-    fn insert_to_table(value: Box<HashCtxConcrete>) -> usize {
-        unimplemented!()
-    }
 }