diff --git a/tools/releasetools/testdata/signing_helper.sh b/tools/releasetools/testdata/signing_helper.sh
new file mode 100755
index 0000000..364e023
--- /dev/null
+++ b/tools/releasetools/testdata/signing_helper.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# 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.
+#
+
+tmpfile=$(mktemp)
+cat $3 | openssl rsautl -sign -inkey $2 -raw > $tmpfile
+cat $tmpfile > $3
+rm $tmpfile
diff --git a/tools/releasetools/testdata/testkey_with_passwd.key b/tools/releasetools/testdata/testkey_with_passwd.key
new file mode 100644
index 0000000..2f0a199
--- /dev/null
+++ b/tools/releasetools/testdata/testkey_with_passwd.key
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----