Add RNG module.

grub-core/lib/random.c

@@ -0,0 +1,120 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2016 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/random.h>
+#include <grub/dl.h>
+#include <grub/lib/hexdump.h>
+#include <grub/command.h>
+#include <grub/mm.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+grub_err_t
+grub_crypto_get_random (void *buffer, grub_size_t sz)
+{
+  /* This is an arbitrer between different methods.
+     TODO: Add more methods in the future.  */
+  /* TODO: Add some PRNG smartness to reduce damage from bad entropy. */
+  if (grub_crypto_arch_get_random (buffer, sz))
+    return GRUB_ERR_NONE;
+  return grub_error (GRUB_ERR_IO, "no random sources found");
+}
+
+static int
+get_num_digits (int val)
+{
+  int ret = 0;
+  while (val != 0)
+    {
+      ret++;
+      val /= 10;
+    }
+  if (ret == 0)
+    return 1;
+  return ret;
+}
+
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+
+static grub_err_t
+grub_cmd_hexdump_random (grub_command_t cmd __attribute__ ((unused)), int argc, char **args)
+{
+  grub_size_t length = 64;
+  grub_err_t err;
+  void *buffer;
+  grub_uint8_t *ptr;
+  int stats[256];
+  int i, digits = 2;
+  char template[10];
+
+  if (argc >= 1)
+    length = grub_strtoull (args[0], 0, 0);
+
+  if (length == 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "length pust be positive");
+
+  buffer = grub_malloc (length);
+  if (!buffer)
+    return grub_errno;
+
+  err = grub_crypto_get_random (buffer, length);
+  if (err)
+    {
+      grub_free (buffer);
+      return err;
+    }
+
+  hexdump (0, buffer, length);
+  grub_memset(stats, 0, sizeof(stats));
+  for (ptr = buffer; ptr < (grub_uint8_t *) buffer + length; ptr++)
+    stats[*ptr]++;
+  grub_printf ("Statistics:\n");
+  for (i = 0; i < 256; i++)
+    {
+      int z = get_num_digits (stats[i]);
+      if (z > digits)
+	digits = z;
+    }
+
+  grub_snprintf (template, sizeof (template), "%%0%dd ", digits);
+
+  for (i = 0; i < 256; i++)
+    {
+      grub_printf ("%s", template);//, stats[i]);
+      if ((i & 0xf) == 0xf)
+	grub_printf ("\n");
+    }
+
+  grub_free (buffer);
+
+  return 0;
+}
+
+static grub_command_t cmd;
+
+GRUB_MOD_INIT (random)
+{
+  cmd = grub_register_command ("hexdump_random", grub_cmd_hexdump_random,
+			      N_("[LENGTH]"),
+			      N_("Hexdump random data."));
+}
+
+GRUB_MOD_FINI (random)
+{
+  grub_unregister_command (cmd);
+}