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diff --git a/lib/nettle/int/mpn-base256.h b/lib/nettle/int/mpn-base256.h
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+/* gmp-glue.h
+
+ Copyright (C) 2013 Niels Möller
+ Copyright (C) 2013 Red Hat
+
+ 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 2 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_GMP_GLUE_H_INCLUDED
+#define NETTLE_GMP_GLUE_H_INCLUDED
+
+#include <nettle/bignum.h>
+
+/* Like mpn_set_str, but always writes rn limbs. If input is larger,
+ higher bits are ignored. */
+void
+mpn_set_base256 (mp_limb_t *rp, mp_size_t rn,
+ const uint8_t *xp, size_t xn);
+
+void
+mpn_get_base256 (uint8_t *rp, size_t rn,
+ const mp_limb_t *xp, mp_size_t xn);
+
+#endif /* NETTLE_GMP_GLUE_H_INCLUDED */