-towards implementing #2685

1 files changed, 86 insertions, 0 deletions

diff --git a/src/nse/perf_kdf.c b/src/nse/perf_kdf.c
new file mode 100644
index 000000000..e462c129f
--- /dev/null
+++ b/src/nse/perf_kdf.c
@@ -0,0 +1,86 @@
+/*
+     This file is part of GNUnet.
+     (C) 2002, 2003, 2004, 2006, 2013 Christian Grothoff (and other contributing authors)
+
+     GNUnet 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 2, or (at your
+     option) any later version.
+
+     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @author Christian Grothoff
+ * @file nse/perf_kdf.c
+ * @brief measure performance of KDF hash function
+ */
+#include "platform.h"
+#include "gnunet_common.h"
+#include "gnunet_util_lib.h"
+#include <gcrypt.h>
+#include <gauger.h>
+
+
+
+/**
+ * Calculate the 'proof-of-work' hash (an expensive hash).
+ *
+ * @param buf data to hash
+ * @param buf_len number of bytes in 'buf'
+ * @param result where to write the resulting hash
+ */
+static void
+pow_hash (const void *buf,
+          size_t buf_len,
+          struct GNUNET_HashCode *result)
+{
+  GNUNET_break (0 == 
+                gcry_kdf_derive (buf, buf_len,
+                                 GCRY_KDF_PBKDF2 /* FIX: use SCRYPT! */,
+                                 1 /* subalgo */,
+                                 "gnunet-proof-of-work", strlen ("gnunet-proof-of-work"),
+                                 2 /* iterations; keep cost of individual op small */,
+                                 sizeof (struct GNUNET_HashCode), result));
+}
+
+
+static void
+perfHash ()
+{
+  struct GNUNET_HashCode hc;
+  unsigned int i;
+  char buf[64];
+
+  memset (buf, 1,  sizeof (buf));
+  for (i = 0; i < 1024; i++)
+    pow_hash (buf, sizeof (buf), &hc);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  struct GNUNET_TIME_Absolute start;
+
+  start = GNUNET_TIME_absolute_get ();
+  perfHash ();
+  printf ("Hash perf took %s\n",
+          GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (start),
+                                                  GNUNET_YES));
+  GAUGER ("NSE", "Proof-of-work hashing",
+          1024 / (1 +
+                  GNUNET_TIME_absolute_get_duration
+                  (start).rel_value), "hashes/s");
+  return 0;
+}
+
+/* end of perf_kdf.c */