diff --git a/pyproject.toml b/pyproject.toml
index 9e11ff8..af0e782 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "SLH-DSA"
-version = "0.1.2"
+version = "0.1.3"
 description = "The pure python impl of the slh-das algorithm(based on fips205)."
 authors = [
     {name = "Colinxu2020", email = "colinxu2020@gmail.com"},
diff --git a/slhdsa/__init__.py b/slhdsa/__init__.py
index d4a7e5d..6acfc81 100644
--- a/slhdsa/__init__.py
+++ b/slhdsa/__init__.py
@@ -1,9 +1,9 @@
 from slhdsa.slhdsa import PublicKey, SecretKey, KeyPair
 from slhdsa.parameters import *  # noqa: F403
-from slhdsa.exception import SLHDSAException, SLHDSASignException, SLHDSAVerifyException
+from slhdsa.exception import SLHDSAException, SLHDSASignException, SLHDSAVerifyException, SLHDSAKeyException
 
 
-__all__ = ["PublicKey", "SecretKey", "KeyPair", "SLHDSAException", "SLHDSASignException", "SLHDSAVerifyException"]
+__all__ = ["PublicKey", "SecretKey", "KeyPair", "SLHDSAException", "SLHDSASignException", "SLHDSAVerifyException", "SLHDSAKeyException"]
 for algo in ["shake", "sha2"]:
     for size in ["128", "192", "256"]:
         for suffix in ["s", "f"]:
diff --git a/tests/test_a.py b/tests/test_a.py
index 653dec4..f0760dd 100644
--- a/tests/test_a.py
+++ b/tests/test_a.py
@@ -1,7 +1,10 @@
 from random import randbytes, randint
 
+from pytest import raises
+
 from slhdsa import KeyPair, sha2_128s, sha2_128f, sha2_192s, sha2_192f, sha2_256s, sha2_256f
 from slhdsa import shake_128s, shake_128f, shake_192s, shake_192f, shake_256s, shake_256f
+from slhdsa import SLHDSAKeyException, PublicKey, SecretKey
 
 
 def _for_all(judger):
@@ -93,4 +96,22 @@ def judge(para):
         assert not kp.verify(msg, sig2)
         sig3 = randbytes(10) + sig[10:]
         assert not kp.verify(msg, sig3)
-    _for_all(judge)
\ No newline at end of file
+    _for_all(judge)
+    
+def test6():
+    def judge(para):
+        pk = KeyPair.gen(para).pub.digest()[:-1]
+        with raises(SLHDSAKeyException):
+            PublicKey.from_digest(pk, para)
+        sk = KeyPair.gen(para).sec.digest()[:-1]
+        with raises(SLHDSAKeyException):
+            SecretKey.from_digest(sk, para)
+        with raises(SLHDSAKeyException):
+            SecretKey.from_digest(sk+b'a', para)
+        kp = KeyPair.gen(para).digest()[:-1]
+        with raises(SLHDSAKeyException):
+            KeyPair.from_digest(kp, para)
+        with raises(SLHDSAKeyException):
+            KeyPair.from_digest(kp+b'a', para)
+    _for_all(judge)
+    
\ No newline at end of file