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 Affero 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.
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @author Christian Grothoff
23 * @file nse/perf_kdf.c
24 * @brief measure performance of KDF hash function
27 #include "gnunet_util_lib.h"
33 * Calculate the 'proof-of-work' hash (an expensive hash).
35 * @param buf data to hash
36 * @param buf_len number of bytes in 'buf'
37 * @param result where to write the resulting hash
40 pow_hash (const void *buf,
42 struct GNUNET_HashCode *result)
45 gcry_kdf_derive (buf, buf_len,
48 "gnunet-proof-of-work", strlen (
49 "gnunet-proof-of-work"),
50 2 /* iterations; keep cost of individual op small */,
51 sizeof(struct GNUNET_HashCode), result));
58 struct GNUNET_HashCode hc;
62 memset (buf, 1, sizeof(buf));
63 for (i = 0; i < 1024; i++)
64 pow_hash (buf, sizeof(buf), &hc);
69 main (int argc, char *argv[])
71 struct GNUNET_TIME_Absolute start;
73 start = GNUNET_TIME_absolute_get ();
75 printf ("Hash perf took %s\n",
76 GNUNET_STRINGS_relative_time_to_string (
77 GNUNET_TIME_absolute_get_duration (start),
79 GAUGER ("NSE", "Proof-of-work hashing",
81 + GNUNET_TIME_absolute_get_duration
82 (start).rel_value_us / 1000.0), "hashes/ms");
87 /* end of perf_kdf.c */