pythongh-103242: Migrate SSLContext.set_ecdh_curve not to use deprecated APIs (python#103378)

Migrate `SSLContext.set_ecdh_curve()` not to use deprecated OpenSSL APIs.

Author: corona10

Misc/NEWS.d/next/Core and Builtins/2023-04-08-17-13-07.gh-issue-103242.ysI1b3.rst

@@ -0,0 +1,2 @@
+Migrate :meth:`~ssl.SSLContext.set_ecdh_curve` method not to use deprecated
+OpenSSL APIs. Patch by Dong-hee Na.

Modules/_ssl.c

@@ -4336,8 +4336,6 @@ _ssl__SSLContext_set_ecdh_curve(PySSLContext *self, PyObject *name)
 {
     PyObject *name_bytes;
     int nid;
-    EC_KEY *key;
-
     if (!PyUnicode_FSConverter(name, &name_bytes))
         return NULL;
     assert(PyBytes_Check(name_bytes));
@@ -4348,13 +4346,20 @@ _ssl__SSLContext_set_ecdh_curve(PySSLContext *self, PyObject *name)
                      "unknown elliptic curve name %R", name);
         return NULL;
     }
-    key = EC_KEY_new_by_curve_name(nid);
+#if OPENSSL_VERSION_MAJOR < 3
+    EC_KEY *key = EC_KEY_new_by_curve_name(nid);
     if (key == NULL) {
         _setSSLError(get_state_ctx(self), NULL, 0, __FILE__, __LINE__);
         return NULL;
     }
     SSL_CTX_set_tmp_ecdh(self->ctx, key);
     EC_KEY_free(key);
+#else
+    if (!SSL_CTX_set1_groups(self->ctx, &nid, 1)) {
+        _setSSLError(get_state_ctx(self), NULL, 0, __FILE__, __LINE__);
+        return NULL;
+    }
+#endif
     Py_RETURN_NONE;
 }