pg_compute_shard.c (1737B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file exchangedb/pg_compute_shard.c 18 * @brief Implementation of the compute_shard function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/platform.h" 22 #include "taler/taler_error_codes.h" 23 #include "taler/taler_dbevents.h" 24 #include "taler/taler_pq_lib.h" 25 #include "pg_compute_shard.h" 26 #include "pg_helper.h" 27 28 29 uint64_t 30 TEH_PG_compute_shard (const struct TALER_MerchantPublicKeyP *merchant_pub) 31 { 32 uint32_t res; 33 34 GNUNET_assert (GNUNET_YES == 35 GNUNET_CRYPTO_kdf (&res, 36 sizeof (res), 37 merchant_pub, 38 sizeof (*merchant_pub), 39 "VOID", 40 4, 41 NULL, 0)); 42 /* interpret hash result as NBO for platform independence, 43 convert to HBO and map to [0..2^31-1] range */ 44 res = ntohl (res); 45 if (res > INT32_MAX) 46 res += INT32_MIN; 47 GNUNET_assert (res <= INT32_MAX); 48 return (uint64_t) res; 49 }