diff --git a/src/modules/pki/path_keys.rs b/src/modules/pki/path_keys.rs
index 734810c2..f2907274 100644
--- a/src/modules/pki/path_keys.rs
+++ b/src/modules/pki/path_keys.rs
@@ -314,9 +314,9 @@ impl PkiBackendInner {
             };
             let iv_value = req.get_data_or_default("iv")?;
             let is_iv_required = matches!(key_type, "aes-gcm" | "aes-cbc" | "sm4-gcm" | "sm4-ccm");
-            #[cfg(tongsuo)]
+            #[cfg(feature = "crypto_adaptor_tongsuo")]
             let is_valid_key_type = matches!(key_type, "aes-gcm" | "aes-cbc" | "aes-ecb" | "sm4-gcm" | "sm4-ccm");
-            #[cfg(not(tongsuo))]
+            #[cfg(not(feature = "crypto_adaptor_tongsuo"))]
             let is_valid_key_type = matches!(key_type, "aes-gcm" | "aes-cbc" | "aes-ecb");
 
             // Check if the key type is valid, if not return an error.
diff --git a/src/utils/key.rs b/src/utils/key.rs
index 03483454..8e20a8de 100644
--- a/src/utils/key.rs
+++ b/src/utils/key.rs
@@ -51,6 +51,7 @@ fn key_bits_default(key_type: &str) -> u32 {
     }
 }
 
+// TODO: this function needs to be refactored to use crypto adaptors.
 fn cipher_from_key_type_and_bits(key_type: &str, bits: u32) -> Result<Cipher, RvError> {
     match (key_type, bits) {
         ("aes-gcm", 128) => Ok(Cipher::aes_128_gcm()),
@@ -62,9 +63,9 @@ fn cipher_from_key_type_and_bits(key_type: &str, bits: u32) -> Result<Cipher, Rv
         ("aes-ecb", 128) => Ok(Cipher::aes_128_ecb()),
         ("aes-ecb", 192) => Ok(Cipher::aes_192_ecb()),
         ("aes-ecb", 256) => Ok(Cipher::aes_256_ecb()),
-        #[cfg(tongsuo)]
+        #[cfg(feature = "crypto_adaptor_tongsuo")]
         ("sm4-gcm", 128) => Ok(Cipher::sm4_gcm()),
-        #[cfg(tongsuo)]
+        #[cfg(feature = "crypto_adaptor_tongsuo")]
         ("sm4-ccm", 128) => Ok(Cipher::sm4_ccm()),
         _ => Err(RvError::ErrPkiKeyBitsInvalid),
     }
@@ -104,7 +105,7 @@ impl KeyBundle {
                 let ec_key = EcKey::generate(&ec_group)?;
                 PKey::from_ec_key(ec_key)?.private_key_to_pem_pkcs8()?
             },
-            #[cfg(tongsuo)]
+            #[cfg(feature = "crypto_adaptor_tongsuo")]
             "sm2" => {
                 self.bits = 256;
                 let ec_group = EcGroup::from_curve_name(Nid::SM2)?;
@@ -114,7 +115,7 @@ impl KeyBundle {
             "aes-gcm" | "aes-cbc" | "aes-ecb" | "sm4-gcm" | "sm4-ccm" => {
                 let _ = cipher_from_key_type_and_bits(self.key_type.as_str(), self.bits)?;
 
-                #[cfg(not(tongsuo))]
+                #[cfg(not(feature = "crypto_adaptor_tongsuo"))]
                 if self.key_type.starts_with("sm4-") {
                     return Err(RvError::ErrPkiKeyTypeInvalid);
                 }
@@ -148,7 +149,7 @@ impl KeyBundle {
     pub fn sign(&self, data: &[u8]) -> Result<Vec<u8>, RvError> {
         let digest = match self.key_type.as_str() {
             "rsa" | "ec" => MessageDigest::sha256(),
-            #[cfg(tongsuo)]
+            #[cfg(feature = "crypto_adaptor_tongsuo")]
             "sm2" => MessageDigest::sm3(),
             _ => return Err(RvError::ErrPkiKeyOperationInvalid),
         };
@@ -167,7 +168,7 @@ impl KeyBundle {
     pub fn verify(&self, data: &[u8], signature: &[u8]) -> Result<bool, RvError> {
         let digest = match self.key_type.as_str() {
             "rsa" | "ec" => MessageDigest::sha256(),
-            #[cfg(tongsuo)]
+            #[cfg(feature = "crypto_adaptor_tongsuo")]
             "sm2" => MessageDigest::sm3(),
             _ => return Err(RvError::ErrPkiKeyOperationInvalid),
         };
@@ -343,7 +344,7 @@ mod test {
     }
 
     #[test]
-    #[cfg(tongsuo)]
+    #[cfg(feature = "crypto_adaptor_tongsuo")]
     fn test_sm2_key_operation() {
         let mut key_bundle = KeyBundle::new("sm2", "sm2", 256);
         test_key_sign_verify(&mut key_bundle);
@@ -384,7 +385,7 @@ mod test {
     }
 
     #[test]
-    #[cfg(tongsuo)]
+    #[cfg(feature = "crypto_adaptor_tongsuo")]
     fn test_sm4_key_operation() {
         // test sm4-gcm
         let mut key_bundle = KeyBundle::new("sm4-gcm-128", "sm4-gcm", 128);