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diff --git a/gmp/tests/rand/t-lc2exp.c b/gmp/tests/rand/t-lc2exp.c
new file mode 100644
index 00000000..dc5c7d6e
--- /dev/null
+++ b/gmp/tests/rand/t-lc2exp.c
@@ -0,0 +1,216 @@
+/* Exercise the lc2exp random functions.
+
+Copyright 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 <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+/* a=0 and c=0 produces zero results always. */
+void
+check_zero (unsigned long m2exp)
+{
+  gmp_randstate_t  r;
+  mpz_t            a;
+  unsigned long    c;
+  int              i;
+
+  mpz_init_set_ui (a, 0L);
+  c = 0L;
+
+  gmp_randinit_lc_2exp (r, a, c, m2exp);
+  gmp_randseed_ui (r, 0L);
+
+  for (i = 0; i < 5; i++)
+    {
+      mpz_urandomb (a, r, 123L);
+      if (mpz_sgn (a) != 0)
+        {
+          printf ("check_zero m2exp=%lu: didn't get zero\n", m2exp);
+          gmp_printf ("  rand=%#Zx\n", a);
+          abort ();
+        }
+    }
+
+  mpz_clear (a);
+  gmp_randclear (r);
+}
+
+/* negative a */
+void
+check_nega (void)
+{
+  gmp_randstate_t  r;
+  mpz_t            a;
+  unsigned long    c, m2exp;
+  int              i;
+
+  mpz_init (a);
+  mpz_setbit (a, 1000L);
+  mpz_neg (a, a);
+  c = 0L;
+  m2exp = 45L;
+
+  gmp_randinit_lc_2exp (r, a, c, m2exp);
+  gmp_randseed_ui (r, 0L);
+
+  for (i = 0; i < 5; i++)
+    {
+      mpz_urandomb (a, r, 123L);
+      if (mpz_sgn (a) != 0)
+        printf ("check_nega m2exp=%lu: didn't get zero\n", m2exp);
+    }
+
+  mpz_clear (a);
+  gmp_randclear (r);
+}
+
+void
+check_bigc (void)
+{
+  gmp_randstate_t  r;
+  mpz_t            a;
+  unsigned long    c, m2exp, bits;
+  int              i;
+
+  mpz_init_set_ui (a, 0L);
+  c = ULONG_MAX;
+  m2exp = 8;
+
+  gmp_randinit_lc_2exp (r, a, c, m2exp);
+  gmp_randseed_ui (r, 0L);
+
+  for (i = 0; i < 20; i++)
+    {
+      bits = 123L;
+      mpz_urandomb (a, r, bits);
+      if (mpz_sgn (a) < 0 || mpz_sizeinbase (a, 2) > bits)
+        {
+          printf     ("check_bigc: mpz_urandomb out of range\n");
+          printf     ("   m2exp=%lu\n", m2exp);
+          gmp_printf ("   rand=%#ZX\n", a);
+          gmp_printf ("   sizeinbase2=%u\n", mpz_sizeinbase (a, 2));
+        }
+    }
+
+  mpz_clear (a);
+  gmp_randclear (r);
+}
+
+void
+check_bigc1 (void)
+{
+  gmp_randstate_t  r;
+  mpz_t            a;
+  unsigned long    c, m2exp;
+  int              i;
+
+  mpz_init_set_ui (a, 0L);
+  c = ULONG_MAX;
+  m2exp = 2;
+
+  gmp_randinit_lc_2exp (r, a, c, m2exp);
+  gmp_randseed_ui (r, 0L);
+
+  for (i = 0; i < 20; i++)
+    {
+      mpz_urandomb (a, r, 1L);
+      if (mpz_cmp_ui (a, 1L) != 0)
+        {
+          printf     ("check_bigc1: mpz_urandomb didn't give 1\n");
+          printf     ("   m2exp=%lu\n", m2exp);
+          gmp_printf ("   got rand=%#ZX\n", a);
+          abort ();
+        }
+    }
+
+  mpz_clear (a);
+  gmp_randclear (r);
+}
+
+/* Checks parameters which triggered an assertion failure in the past.
+   Happened when limbs(a)+limbs(c) < bits_to_limbs(m2exp).  */
+void
+check_bigm (void)
+{
+  gmp_randstate_t rstate;
+  mpz_t a;
+
+  mpz_init_set_ui (a, 5L);
+  gmp_randinit_lc_2exp (rstate, a, 1L, 384L);
+
+  mpz_urandomb (a, rstate, 20L);
+
+  gmp_randclear (rstate);
+  mpz_clear (a);
+}
+
+/* Checks for seeds bigger than the modulus.  */
+void
+check_bigs (void)
+{
+  gmp_randstate_t rstate;
+  mpz_t sd, a;
+  int i;
+
+  mpz_init (sd);
+  mpz_setbit (sd, 300L);
+  mpz_sub_ui (sd, sd, 1L);
+  mpz_clrbit (sd, 13L);
+  mpz_init_set_ui (a, 123456789L);
+
+  gmp_randinit_lc_2exp (rstate, a, 5L, 64L);
+
+  for (i = 0; i < 20; i++)
+    {
+      mpz_neg (sd, sd);
+      gmp_randseed (rstate, sd);
+      mpz_mul_ui (sd, sd, 7L);
+
+      mpz_urandomb (a, rstate, 80L);
+    }
+
+  gmp_randclear (rstate);
+  mpz_clear (a);
+  mpz_clear (sd);
+}
+
+int
+main (void)
+{
+  tests_start ();
+
+  check_zero (2L);
+  check_zero (7L);
+  check_zero (32L);
+  check_zero (64L);
+  check_zero (1000L);
+
+  check_nega ();
+  check_bigc ();
+  check_bigc1 ();
+
+  check_bigm ();
+  check_bigs ();
+
+  tests_end ();
+  exit (0);
+}