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diff --git a/external/nettle-3.3/nettle/nettle-write.h b/external/nettle-3.3/nettle/nettle-write.h
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+/* nettle-write.h
+
+ Internal functions to write out word-sized data to byte arrays.
+
+ Copyright (C) 2010 Niels Möller
+
+ This file is part of GNU Nettle.
+
+ GNU Nettle is free software: you can redistribute it and/or
+ modify it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+ or both in parallel, as here.
+
+ GNU Nettle 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef NETTLE_WRITE_H_INCLUDED
+#define NETTLE_WRITE_H_INCLUDED
+
+/* For size_t */
+#include <stddef.h>
+
+#include "nettle-stdint.h"
+
+/* Write the word array at SRC to the byte array at DST, using little
+ endian (le) or big endian (be) byte order, and truncating the
+ result to LENGTH bytes. */
+
+/* FIXME: Use a macro shortcut to memcpy for native endianness. */
+void
+_nettle_write_be32(size_t length, uint8_t *dst,
+ uint32_t *src);
+void
+_nettle_write_le32(size_t length, uint8_t *dst,
+ uint32_t *src);
+
+void
+_nettle_write_le64(size_t length, uint8_t *dst,
+ uint64_t *src);
+
+#endif /* NETTLE_WRITE_H_INCLUDED */