From 942b004af9dd1823a8bb8358719f070320a04444 Mon Sep 17 00:00:00 2001
From: RinZ27 <222222878+RinZ27@users.noreply.github.com>
Date: Sat, 21 Mar 2026 19:46:11 +0700
Subject: [PATCH] Fix NameError in PQDH when handling invalid algorithms

---
 asyncssh/crypto/pq.py | 2 +-
 tests/test_kex.py     | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/asyncssh/crypto/pq.py b/asyncssh/crypto/pq.py
index bf24503..142f6fa 100644
--- a/asyncssh/crypto/pq.py
+++ b/asyncssh/crypto/pq.py
@@ -59,7 +59,7 @@ def __init__(self, alg_name: bytes):
             self.ciphertext_bytes, self.secret_bytes, \
             oqs_name = _pq_algs[alg_name]
         except KeyError: # pragma: no cover, other algs not registered
-            raise ValueError(f'Unknown PQ algorithm {oqs_name}') from None
+            raise ValueError(f'Unknown PQ algorithm {alg_name.decode()}') from None
 
         if not hasattr(_oqs, 'OQS_' + oqs_name + '_keypair'): # pragma: no cover
             oqs_name += '_ipd'
diff --git a/tests/test_kex.py b/tests/test_kex.py
index 01d8a19..273489b 100644
--- a/tests/test_kex.py
+++ b/tests/test_kex.py
@@ -650,3 +650,9 @@ async def test_rsa_errors(self):
 
         client_conn.close()
         server_conn.close()
+
+    def test_invalid_pq_alg(self):
+        """Test providing an invalid PQ algorithm"""
+
+        with self.assertRaisesRegex(ValueError, 'Unknown PQ algorithm invalid'):
+            PQDH(b'invalid')