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/*
This file is part of GNUnet.
Copyright (C) 2002, 2003, 2004, 2006, 2013 GNUnet e.V.
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 3 of the License,
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
Affero General Public License for more details.
*/
/**
* @author Christian Grothoff
* @file nse/perf_kdf.c
* @brief measure performance of KDF hash function
*/
#include "platform.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_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",
1024.0 / (1.0 +
GNUNET_TIME_absolute_get_duration
(start).rel_value_us / 1000.0), "hashes/ms");
return 0;
}
/* end of perf_kdf.c */
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