Remove conditionals for TLS 1.3 (#1340)

It is always available now

Author: alex

src/OpenSSL/SSL.py

@@ -82,6 +82,7 @@
     "OP_NO_TLSv1",
     "OP_NO_TLSv1_1",
     "OP_NO_TLSv1_2",
+    "OP_NO_TLSv1_3",
     "MODE_RELEASE_BUFFERS",
     "OP_SINGLE_DH_USE",
     "OP_SINGLE_ECDH_USE",
@@ -188,11 +189,7 @@
 OP_NO_TLSv1: int = _lib.SSL_OP_NO_TLSv1
 OP_NO_TLSv1_1: int = _lib.SSL_OP_NO_TLSv1_1
 OP_NO_TLSv1_2: int = _lib.SSL_OP_NO_TLSv1_2
-try:
-    OP_NO_TLSv1_3: int = _lib.SSL_OP_NO_TLSv1_3
-    __all__.append("OP_NO_TLSv1_3")
-except AttributeError:
-    pass
+OP_NO_TLSv1_3: int = _lib.SSL_OP_NO_TLSv1_3
 
 MODE_RELEASE_BUFFERS: int = _lib.SSL_MODE_RELEASE_BUFFERS
 

tests/test_ssl.py

@@ -101,7 +101,6 @@
     SSLEAY_DIR,
     SSLEAY_PLATFORM,
     SSLEAY_VERSION,
-    TLS1_1_VERSION,
     TLS1_2_VERSION,
     TLS1_3_VERSION,
     TLS_METHOD,
@@ -137,11 +136,6 @@
 except ImportError:
     SSL_ST_INIT = SSL_ST_BEFORE = SSL_ST_OK = SSL_ST_RENEGOTIATE = None
 
-try:
-    from OpenSSL.SSL import OP_NO_TLSv1_3
-except ImportError:
-    OP_NO_TLSv1_3 = None
-
 from .test_crypto import (
     client_cert_pem,
     client_key_pem,
@@ -1007,12 +1001,8 @@ def keylog(conn, line):
         assert all(b"CLIENT_RANDOM" in line for conn, line in called)
 
     def test_set_proto_version(self):
-        if OP_NO_TLSv1_3 is None:
-            high_version = TLS1_2_VERSION
-            low_version = TLS1_1_VERSION
-        else:
-            high_version = TLS1_3_VERSION
-            low_version = TLS1_2_VERSION
+        high_version = TLS1_3_VERSION
+        low_version = TLS1_2_VERSION
 
         server_context = Context(TLS_METHOD)
         server_context.use_certificate(