2 This file is part of GNUnet.
3 (C) 2002, 2003, 2004, 2006, 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @author Christian Grothoff
23 * @file nse/perf_kdf.c
24 * @brief measure performance of KDF hash function
27 #include "gnunet_common.h"
28 #include "gnunet_util_lib.h"
35 * Calculate the 'proof-of-work' hash (an expensive hash).
37 * @param buf data to hash
38 * @param buf_len number of bytes in 'buf'
39 * @param result where to write the resulting hash
42 pow_hash (const void *buf,
44 struct GNUNET_HashCode *result)
47 gcry_kdf_derive (buf, buf_len,
50 "gnunet-proof-of-work", strlen ("gnunet-proof-of-work"),
51 2 /* iterations; keep cost of individual op small */,
52 sizeof (struct GNUNET_HashCode), result));
59 struct GNUNET_HashCode hc;
63 memset (buf, 1, sizeof (buf));
64 for (i = 0; i < 1024; i++)
65 pow_hash (buf, sizeof (buf), &hc);
70 main (int argc, char *argv[])
72 struct GNUNET_TIME_Absolute start;
74 start = GNUNET_TIME_absolute_get ();
76 printf ("Hash perf took %s\n",
77 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (start),
79 GAUGER ("NSE", "Proof-of-work hashing",
81 GNUNET_TIME_absolute_get_duration
82 (start).rel_value_us / 1000LL), "hashes/ms");
86 /* end of perf_kdf.c */