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diff --git a/usr/src/common/mpi/mpprime.c b/usr/src/common/mpi/mpprime.c
new file mode 100644
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+++ b/usr/src/common/mpi/mpprime.c
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+/*
+ *  mpprime.c
+ *
+ *  Utilities for finding and working with prime and pseudo-prime
+ *  integers
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the MPI Arbitrary Precision Integer Arithmetic library.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael J. Fromberger.
+ * Portions created by the Initial Developer are Copyright (C) 1997
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Netscape Communications Corporation
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Sun elects to use this software under the MPL license.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include "mpi-priv.h"
+#include "mpprime.h"
+#include "mplogic.h"
+#ifndef _KERNEL
+#include <stdlib.h>
+#include <string.h>
+#else
+#include <sys/random.h>
+#endif
+
+#define SMALL_TABLE 0 /* determines size of hard-wired prime table */
+
+#ifndef _KERNEL
+#define RANDOM() rand()
+#else
+#define RANDOM() foo_rand()
+
+static int
+foo_rand()
+{
+	int r;
+	random_get_pseudo_bytes((uchar_t *)&r, sizeof (r));
+	return (r);
+}
+#endif
+
+/*
+  mpp_random(a)
+
+  Assigns a random value to a.  This value is generated using the
+  standard C library's rand() function, so it should not be used for
+  cryptographic purposes, but it should be fine for primality testing,
+  since all we really care about there is good statistical properties.
+
+  As many digits as a currently has are filled with random digits.
+ */
+
+mp_err  mpp_random(mp_int *a)
+
+{
+  mp_digit  next = 0;
+  unsigned int       ix, jx;
+
+  ARGCHK(a != NULL, MP_BADARG);
+
+  for(ix = 0; ix < USED(a); ix++) {
+    for(jx = 0; jx < sizeof(mp_digit); jx++) {
+      next = (next << CHAR_BIT) | (RANDOM() & UCHAR_MAX);
+    }
+    DIGIT(a, ix) = next;
+  }
+
+  return MP_OKAY;
+
+} /* end mpp_random() */
+
+/* }}} */
+
+/* {{{ mpp_random_size(a, prec) */
+
+mp_err  mpp_random_size(mp_int *a, mp_size prec)
+{
+  mp_err   res;
+
+  ARGCHK(a != NULL && prec > 0, MP_BADARG);
+  
+  if((res = s_mp_pad(a, prec)) != MP_OKAY)
+    return res;
+
+  return mpp_random(a);
+
+} /* end mpp_random_size() */