diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3a8a43e
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module golang.org/x/crypto
+
+require golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..1936851
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=