1 files changed, 9 insertions, 0 deletions
diff --git a/paramiko/kex_curve25519.py b/paramiko/kex_curve25519.py
index 60fb2c7a..b092afae 100644
--- a/paramiko/kex_curve25519.py
+++ b/paramiko/kex_curve25519.py
@@ -1,6 +1,7 @@
 import binascii
 import hashlib
 
+from cryptography.exceptions import UnsupportedAlgorithm
 from cryptography.hazmat.primitives import constant_time, serialization
 from cryptography.hazmat.primitives.asymmetric.x25519 import (
     X25519PrivateKey, X25519PublicKey
@@ -19,6 +20,14 @@ class KexCurve25519(object):
         self.transport = transport
         self.key = None
 
+    def is_available(self):
+        try:
+            X25519PrivateKey.generate()
+        except UnsupportedAlgorithm:
+            return False
+        else:
+            return True
+
     def _perform_exchange(self, peer_key):
         secret = self.key.exchange(peer_key)
         if constant_time.bytes_eq(secret, b"\x00" * 32):