Add a failing test for OpenSSH-formatted ECDSA public keys

Author: mark-adams

tests/keys/testkey_ec_ssh.pub

@@ -0,0 +1 @@
+ecdsa-sha2-nistp521 AAAAE2VjZHNhLXNoYTItbmlzdHA1MjEAAAAIbmlzdHA1MjEAAACFBAFZwnA8QCdL+TiQWBSHE0XsnRJBCFkb6c2DL7+ZfCFDk9khSYh3VrVOOQ1eIrO/oOm20Gp24dvP9XQS0f5B9bLQHgGFnkydPIMaNzPUNCop17F5uHOhtuFIhmOlh3lpTjyj2ten86cCetqN12kawnRs1/iu0wsGoVgk3os6yUAHvFMFGA==

tests/test_algorithms.py

@@ -375,6 +375,13 @@ def test_ec_should_accept_pem_private_key_bytes(self):
         with open(key_path('testkey_ec'), 'rb') as ec_key:
             algo.prepare_key(ec_key.read())
 
+    @pytest.mark.skipif(not has_crypto, reason='Not supported without cryptography library')
+    def test_ec_should_accept_ssh_public_key_bytes(self):
+        algo = ECAlgorithm(ECAlgorithm.SHA256)
+
+        with open(key_path('testkey_ec_ssh.pub'), 'r') as ec_key:
+            algo.prepare_key(ec_key.read())
+
     @pytest.mark.skipif(not has_crypto, reason='Not supported without cryptography library')
     def test_ec_verify_should_return_false_if_signature_invalid(self):
         algo = ECAlgorithm(ECAlgorithm.SHA256)