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+# Copyright 2013 Donald Stufft and individual contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from nacl import exceptions as exc
+from nacl._sodium import ffi, lib
+from nacl.exceptions import ensure
+
+
+def _sodium_init() -> None:
+ ensure(
+ lib.sodium_init() != -1,
+ "Could not initialize sodium",
+ raising=exc.RuntimeError,
+ )
+
+
+def sodium_init() -> None:
+ """
+ Initializes sodium, picking the best implementations available for this
+ machine.
+ """
+ ffi.init_once(_sodium_init, "libsodium")