From c0a8dab984d1214a76b6116a02baf1021bf7dc73 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Mon, 25 Dec 2017 22:29:21 -0500
Subject: [PATCH] Fix failed self test under Clang (GH #533) This may cause GH
 #300, "Clang 3.9 and missing member definitions for template classes" or GH
 #294, "Fix clang warnings about undefined variable templates in pkcspad.h" to
 resurface. Man I hope not...

---
 hashfwd.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 hashfwd.h

diff --git a/hashfwd.h b/hashfwd.h
new file mode 100644
index 00000000..00fc86b4
--- /dev/null
+++ b/hashfwd.h
@@ -0,0 +1,35 @@
+// hashfwd.h - written and placed in the public domain by Jeffrey Walton
+
+/// \file hashfwd.h
+/// \brief Forward declarations for hash functions used in signature encoding methods
+
+#ifndef CRYPTOPP_HASHFWD_H
+#define CRYPTOPP_HASHFWD_H
+
+#include "config.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+class SHA1;
+class SHA224;
+class SHA256;
+class SHA384;
+class SHA512;
+
+// http://github.com/weidai11/cryptopp/issues/517
+class SHA3_256;
+class SHA3_384;
+class SHA3_512;
+
+class Tiger;
+class RIPEMD128;
+class RIPEMD160;
+
+namespace Weak1 {
+  class MD2;
+  class MD5;
+}
+
+NAMESPACE_END
+
+#endif  // CRYPTOPP_HASHFWD_H