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diff --git a/paludis/util/sha512.hh b/paludis/util/sha512.hh
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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2006, 2007 Ciaran McCreesh
+ * Copyright (c) 2008, 2011 David Leverton
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef PALUDIS_GUARD_PALUDIS_UTIL_SHA512_HH
+#define PALUDIS_GUARD_PALUDIS_UTIL_SHA512_HH 1
+
+#include <iosfwd>
+#include <string>
+#include <paludis/util/attributes.hh>
+#include <inttypes.h>
+
+/** \file
+ * Declarations for the SHA512 digest class.
+ *
+ * \ingroup g_digests
+ *
+ * \section Examples
+ *
+ * - None at this time.
+ */
+
+namespace paludis
+{
+    /**
+     * SHA512 digest class.
+     *
+     * \ingroup g_digests
+     */
+    class PALUDIS_VISIBLE SHA512
+    {
+        private:
+            uint64_t h0, h1, h2, h3, h4, h5, h6, h7;
+
+            void PALUDIS_HIDDEN process_block(uint64_t *);
+
+        public:
+            /**
+             * Constructor.
+             */
+            SHA512(std::istream & stream);
+
+            /**
+             * Our checksum, as a string of hex characters.
+             */
+            std::string hexsum() const;
+    };
+}
+
+#endif