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diff --git a/src/chacha-poly1305/poly1305.h b/src/chacha-poly1305/poly1305.h
new file mode 100644
index 00000000..9a640158
--- /dev/null
+++ b/src/chacha-poly1305/poly1305.h
@@ -0,0 +1,16 @@
+/* $OpenBSD: poly1305.h,v 1.2 2013/12/19 22:57:13 djm Exp $ */
+
+/* 
+ * Public Domain poly1305 from Andrew Moon
+ * poly1305-donna-unrolled.c from https://github.com/floodyberry/poly1305-donna
+ */
+
+#ifndef POLY1305_H
+#define POLY1305_H
+
+#define POLY1305_KEYLEN		32
+#define POLY1305_TAGLEN		16
+
+void poly1305_auth(uint8_t out[POLY1305_TAGLEN], const uint8_t *m, size_t inlen, const uint8_t key[POLY1305_KEYLEN]);
+
+#endif				/* POLY1305_H */