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/*
This file is part of GNUnet.
Copyright (C) 2012, 2013, 2019 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero 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.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/crypto_pow.c
* @brief proof-of-work hashing
* @author Christian Grothoff
* @author Bart Polot
*/
#include "platform.h"
#include "gnunet_crypto_lib.h"
#include <sodium.h>
/**
* Calculate the 'proof-of-work' hash (an expensive hash).
* We're using a non-standard formula to avoid issues with
* ASICs appearing (see #3795).
*
* @param salt salt for the hash. Must be crypto_pwhash_argon2id_SALTBYTES long.
* @param buf data to hash
* @param buf_len number of bytes in @a buf
* @param result where to write the resulting hash
*/
void
GNUNET_CRYPTO_pow_hash (const char *salt,
const void *buf,
size_t buf_len,
struct GNUNET_HashCode *result)
{
GNUNET_assert (strlen (salt) == crypto_pwhash_argon2id_SALTBYTES);
/* Threads hardcoded at 1 in libsodium */
GNUNET_break (0 ==
crypto_pwhash_argon2id ((unsigned char *) result,
sizeof (struct GNUNET_HashCode),
buf,
buf_len,
(unsigned char*) salt,
3, /* iterations */
1024 * 1024, /* memory (1 MiB) */
crypto_pwhash_argon2id_ALG_ARGON2ID13));
}
/* end of crypto_pow.c */
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