diff --git a/src/sst/gen_key.rs b/src/sst/gen_key.rs
index 7162baf..68dd273 100644
--- a/src/sst/gen_key.rs
+++ b/src/sst/gen_key.rs
@@ -99,6 +99,9 @@ mod tests {
     use crate::util::helper::test_helper::gen_random_seed;
     use crate::HssParameter;
     use crate::Sha256_128;
+    use crate::Sha256_192;
+    use crate::Sha256_256;
+    use signature::Verifier;
 
     #[test]
     fn test_prepare_sst_keygen_se_without_lms_tree_id() {
@@ -152,47 +155,69 @@ mod tests {
     }
 
     #[test]
-    fn test_finalize_sst_keygen() {
+    fn signing_sst_sha256_128() {
+        signing_sst_core::<Sha256_128>();
+    }
+
+    #[test]
+    fn signing_sst_sha256_192() {
+        signing_sst_core::<Sha256_192>();
+    }
+
+    #[test]
+    fn signing_sst_sha256_256() {
+        signing_sst_core::<Sha256_256>();
+    }
+
+    fn signing_sst_core<H: HashChain>() {
         const L0_TOP_DIV: u32 = 4;
 
+        let mut message = [
+            32u8, 48, 2, 1, 48, 58, 20, 57, 9, 83, 99, 255, 0, 34, 2, 1, 0,
+        ];
+
         let mut lms_tree_identifier = LmsTreeIdentifier::default();
-        let seed = gen_random_seed::<Sha256_128>();
+        let seed = gen_random_seed::<H>();
         let mut hss_parameters = ArrayVec::new();
         hss_parameters.extend_from_slice(&[
             HssParameter::construct_default_parameters(),
             HssParameter::construct_default_parameters(),
         ]);
-        let ssts_parameter = SstsParameter::<Sha256_128>::new(hss_parameters, L0_TOP_DIV as u8, 3);
-        let mut aux_data = [0u8; 4 + 16 + 2usize.pow(L0_TOP_DIV) * 16];
+        let ssts_parameter = SstsParameter::<H>::new(hss_parameters, L0_TOP_DIV as u8, 3);
+        let mut aux_data = [0u8; 4 + MAX_HASH_SIZE + 2usize.pow(L0_TOP_DIV) * MAX_HASH_SIZE];
         let aux_ref: &mut &mut [u8] = &mut &mut aux_data[..];
         let mut aux_option = Some(aux_ref);
 
-        let (signing_key, interm_node) = if let Some(aux) = aux_option.as_deref_mut() {
-            prepare_sst_keygen::<Sha256_128>(
-                &ssts_parameter,
-                &seed,
-                Some(aux),
-                &mut lms_tree_identifier,
-            )
-            .unwrap()
-        } else {
-            // TODO Rm dead-end
-            prepare_sst_keygen::<Sha256_128>(&ssts_parameter, &seed, None, &mut lms_tree_identifier)
-                .unwrap()
-        };
+        let (mut signing_key, interm_node) = prepare_sst_keygen::<H>(
+            &ssts_parameter,
+            &seed,
+            Some(aux_option.as_mut().unwrap()),
+            &mut lms_tree_identifier,
+        )
+        .unwrap();
+
         let mut interm_nodes =
             ArrayVec::<[ArrayVec<[u8; MAX_HASH_SIZE]>; MAX_SSTS_SIGNING_ENTITIES]>::new();
+        let mut tmp_node = ArrayVec::<[u8; MAX_HASH_SIZE]>::new();
+        tmp_node.extend_from_slice(&interm_node);
         for _ in 0..2usize.pow(L0_TOP_DIV) {
-            let mut tmp_node = ArrayVec::<[u8; MAX_HASH_SIZE]>::new();
-            tmp_node.extend_from_slice(&interm_node);
             interm_nodes.push(tmp_node);
         }
-        let _verifying_key = finalize_sst_keygen::<Sha256_128>(
+
+        let verifying_key = finalize_sst_keygen::<H>(
             signing_key.as_slice(),
             &interm_nodes,
-            aux_option,
+            Some(aux_option.as_mut().unwrap()),
             &lms_tree_identifier,
         )
         .unwrap();
+
+        let signature = signing_key
+            .try_sign_with_aux(&message, aux_option, Some(&lms_tree_identifier))
+            .unwrap();
+
+        assert!(verifying_key.verify(&message, &signature).is_ok());
+        message[0] = 33;
+        assert!(verifying_key.verify(&message, &signature).is_err());
     }
 }