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diff --git a/lib/rand-isaac.h b/lib/rand-isaac.h
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+/* Bob Jenkins's cryptographic random number generators, ISAAC and ISAAC64.
+
+   Copyright (C) 1999-2022 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 1999 Colin Plumb.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of 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.
+
+   This program 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, see <https://www.gnu.org/licenses/>.
+
+   Written by Colin Plumb and Paul Eggert.  */
+
+#ifndef _GL_RAND_ISAAC_H
+#define _GL_RAND_ISAAC_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* Log base 2 of the number of useful bits in an ISAAC word.  It must
+   be either 5 or 6.  By default, this uses a value that should be
+   faster for this architecture.  */
+#ifndef ISAAC_BITS_LOG
+ #if SIZE_MAX >> 31 >> 31 < 3 /* SIZE_MAX < 2**64 - 1 */
+  #define ISAAC_BITS_LOG 5
+ #else
+  #define ISAAC_BITS_LOG 6
+ #endif
+#endif
+
+/* The number of bits in an ISAAC word.  */
+#define ISAAC_BITS (1 << ISAAC_BITS_LOG)
+
+#if ISAAC_BITS == 32
+  typedef uint_least32_t isaac_word;
+#else
+  typedef uint_least64_t isaac_word;
+#endif
+
+/* Size of the state tables to use.  ISAAC_WORDS_LOG should be at least 3,
+   and smaller values give less security.  */
+#define ISAAC_WORDS_LOG 8
+#define ISAAC_WORDS (1 << ISAAC_WORDS_LOG)
+#define ISAAC_BYTES (ISAAC_WORDS * sizeof (isaac_word))
+
+/* State variables for the random number generator.  The M member
+   should be seeded with nonce data before calling isaac_seed.  The
+   other members are private.  */
+struct isaac_state
+  {
+    isaac_word m[ISAAC_WORDS];	/* Main state array */
+    isaac_word a, b, c;		/* Extra variables */
+  };
+
+void isaac_seed (struct isaac_state *) _GL_ATTRIBUTE_NONNULL ();
+void isaac_refill (struct isaac_state *, isaac_word[ISAAC_WORDS])
+  _GL_ATTRIBUTE_NONNULL ();
+
+#endif