diff -r 000000000000 -r 6474c204b198 security/nss/lib/freebl/mpi/utils/gcd.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/nss/lib/freebl/mpi/utils/gcd.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,86 @@
+/*
+ *  gcd.c
+ *
+ *  Greatest common divisor
+ *
+ * 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 <string.h>
+
+#include "mpi.h"
+
+char     *g_prog = NULL;
+
+void print_mp_int(mp_int *mp, FILE *ofp);
+
+int main(int argc, char *argv[]) 
+{
+  mp_int   a, b, x, y;
+  mp_err   res;
+  int      ext = 0;
+
+  g_prog = argv[0];
+
+  if(argc < 3) {
+    fprintf(stderr, "Usage: %s <a> <b>\n", g_prog);
+    return 1;
+  }
+
+  mp_init(&a); mp_read_radix(&a, argv[1], 10);
+  mp_init(&b); mp_read_radix(&b, argv[2], 10);
+
+  /* If we were called 'xgcd', compute x, y so that g = ax + by */
+  if(strcmp(g_prog, "xgcd") == 0) {
+    ext = 1;
+    mp_init(&x); mp_init(&y);
+  }
+
+  if(ext) {
+    if((res = mp_xgcd(&a, &b, &a, &x, &y)) != MP_OKAY) {
+      fprintf(stderr, "%s: error: %s\n", g_prog, mp_strerror(res));
+      mp_clear(&a); mp_clear(&b);
+      mp_clear(&x); mp_clear(&y);
+      return 1;
+    }
+  } else {
+    if((res = mp_gcd(&a, &b, &a)) != MP_OKAY) {
+      fprintf(stderr, "%s: error: %s\n", g_prog,
+	      mp_strerror(res));
+      mp_clear(&a); mp_clear(&b);
+      return 1;
+    }
+  }
+
+  print_mp_int(&a, stdout); 
+  if(ext) {
+    fputs("x = ", stdout); print_mp_int(&x, stdout); 
+    fputs("y = ", stdout); print_mp_int(&y, stdout); 
+  }
+
+  mp_clear(&a); mp_clear(&b);
+
+  if(ext) {
+    mp_clear(&x);
+    mp_clear(&y);
+  }
+
+  return 0;
+
+}
+
+void print_mp_int(mp_int *mp, FILE *ofp)
+{
+  char  *buf;
+  int    len;
+
+  len = mp_radix_size(mp, 10);
+  buf = calloc(len, sizeof(char));
+  mp_todecimal(mp, buf);
+  fprintf(ofp, "%s\n", buf);
+  free(buf);
+
+}