diff -r 000000000000 -r 6474c204b198 security/nss/lib/freebl/mpi/utils/invmod.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/nss/lib/freebl/mpi/utils/invmod.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,59 @@
+/*
+ *  invmod.c
+ *
+ *  Compute modular inverses
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpi.h"
+
+int main(int argc, char *argv[])
+{
+  mp_int    a, m;
+  mp_err    res;
+  char     *buf;
+  int       len, out = 0;
+
+  if(argc < 3) {
+    fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]);
+    return 1;
+  }
+
+  mp_init(&a); mp_init(&m);
+  mp_read_radix(&a, argv[1], 10);
+  mp_read_radix(&m, argv[2], 10);
+
+  if(mp_cmp(&a, &m) > 0)
+    mp_mod(&a, &m, &a);
+
+  switch((res = mp_invmod(&a, &m, &a))) {
+  case MP_OKAY:
+    len = mp_radix_size(&a, 10);
+    buf = malloc(len);
+
+    mp_toradix(&a, buf, 10);
+    printf("%s\n", buf);
+    free(buf);
+    break;
+
+  case MP_UNDEF:
+    printf("No inverse\n");
+    out = 1;
+    break;
+
+  default:
+    printf("error: %s (%d)\n", mp_strerror(res), res);
+    out = 2;
+    break;
+  }
+
+  mp_clear(&a);
+  mp_clear(&m);
+
+  return out;
+}