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diff --git a/poly1305.h b/poly1305.h
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+++ b/poly1305.h
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+/* $OpenBSD: poly1305.h,v 1.4 2014/05/02 03:27:54 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
+
+#include <sys/types.h>
+
+#define POLY1305_KEYLEN		32
+#define POLY1305_TAGLEN		16
+
+void poly1305_auth(u_char out[POLY1305_TAGLEN], const u_char *m, size_t inlen,
+    const u_char key[POLY1305_KEYLEN])
+    __attribute__((__bounded__(__minbytes__, 1, POLY1305_TAGLEN)))
+    __attribute__((__bounded__(__buffer__, 2, 3)))
+    __attribute__((__bounded__(__minbytes__, 4, POLY1305_KEYLEN)));
+
+#endif	/* POLY1305_H */