2 This file is part of GNUnet.
3 Copyright (C) 2002, 2003, 2004, 2006, 2013 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
17 * @author Christian Grothoff
18 * @file nse/perf_kdf.c
19 * @brief measure performance of KDF hash function
22 #include "gnunet_util_lib.h"
29 * Calculate the 'proof-of-work' hash (an expensive hash).
31 * @param buf data to hash
32 * @param buf_len number of bytes in 'buf'
33 * @param result where to write the resulting hash
36 pow_hash (const void *buf,
38 struct GNUNET_HashCode *result)
41 gcry_kdf_derive (buf, buf_len,
44 "gnunet-proof-of-work", strlen ("gnunet-proof-of-work"),
45 2 /* iterations; keep cost of individual op small */,
46 sizeof (struct GNUNET_HashCode), result));
53 struct GNUNET_HashCode hc;
57 memset (buf, 1, sizeof (buf));
58 for (i = 0; i < 1024; i++)
59 pow_hash (buf, sizeof (buf), &hc);
64 main (int argc, char *argv[])
66 struct GNUNET_TIME_Absolute start;
68 start = GNUNET_TIME_absolute_get ();
70 printf ("Hash perf took %s\n",
71 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (start),
73 GAUGER ("NSE", "Proof-of-work hashing",
75 GNUNET_TIME_absolute_get_duration
76 (start).rel_value_us / 1000.0), "hashes/ms");
80 /* end of perf_kdf.c */