diff --git a/regress/valid.ext b/regress/valid.ext
new file mode 100644
index 0000000..81058b4
--- /dev/null
+++ b/regress/valid.ext
@@ -0,0 +1,3 @@
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment