diff --git a/PRESUBMIT.py b/PRESUBMIT.py
new file mode 100644
index 0000000..4f13a4e
--- /dev/null
+++ b/PRESUBMIT.py
@@ -0,0 +1,53 @@
+# Copyright 2025 The BoringSSL Authors
+#
+# 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
+#
+#     https://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.
+
+"""Presubmit checks for BoringSSL.
+
+Run by the presubmit API in depot_tools, e.g. by running `git cl presubmit`.
+"""
+
+PRESUBMIT_VERSION = '2.0.0'
+USE_PYTHON3 = True
+
+
+def CheckPregeneratedFiles(input_api, output_api):
+  """Checks that pregenerated files are properly updated."""
+  # TODO(chlily): Make this compatible with the util/bot environment for CI/CQ.
+  try:
+    # Check that `go` is available on the $PATH.
+    input_api.subprocess.check_call(['go', 'version'],
+                                    stdout=input_api.subprocess.PIPE,
+                                    stderr=input_api.subprocess.PIPE)
+  except input_api.subprocess.CalledProcessError as e:
+    return [
+        output_api.PresubmitPromptOrNotify(f'Could not run `go`: {e}')
+    ]
+
+  pregenerate_script_path = input_api.os_path.join(
+      input_api.change.RepositoryRoot(), 'util', 'pregenerate')
+  try:
+    out, retcode = input_api.subprocess.communicate(
+        ['go', 'run', pregenerate_script_path, '-check'],
+        stdout=input_api.subprocess.PIPE,
+        stderr=input_api.subprocess.PIPE)
+    if retcode:
+      bad = out[1].decode("utf-8").splitlines()
+      return [
+          output_api.PresubmitError(
+              ("Found out-of-date generated files. "
+               "Run `go run ./util/pregenerate` to update them."), bad)
+      ]
+  except input_api.subprocess.CalledProcessError as e:
+    return [output_api.PresubmitError(f'Could not run go script: {e}')]
+  return []  # Check passed.