diff --git a/src/crypto/shen_ed25519_ref b/src/crypto/shen_ed25519_ref
new file mode 160000
index 000000000..ecfb9166a
--- /dev/null
+++ b/src/crypto/shen_ed25519_ref
@@ -0,0 +1 @@
+Subproject commit ecfb9166ab10de6c42f89e5ccb22ac9547505218