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diff --git a/gmp/mpz/urandomb.c b/gmp/mpz/urandomb.c
new file mode 100644
index 00000000..3072cd40
--- /dev/null
+++ b/gmp/mpz/urandomb.c
@@ -0,0 +1,37 @@
+/* mpz_urandomb (rop, state, n) -- Generate a uniform pseudorandom
+   integer in the range 0 to 2^N - 1, inclusive, using STATE as the
+   random state previously initialized by a call to gmp_randinit().
+
+Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of 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.
+
+The GNU MP Library 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+mpz_urandomb (mpz_ptr rop, gmp_randstate_t rstate, unsigned long int nbits)
+{
+  mp_ptr rp;
+  mp_size_t size;
+
+  size = BITS_TO_LIMBS (nbits);
+  rp = MPZ_REALLOC (rop, size);
+
+  _gmp_rand (rp, rstate, nbits);
+  MPN_NORMALIZE (rp, size);
+  SIZ (rop) = size;
+}