Line data    Source code

       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          191 : TEH_PG_compute_shard (const struct TALER_MerchantPublicKeyP *merchant_pub)
      31              : {
      32              :   uint32_t res;
      33              : 
      34          191 :   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          191 :   res = ntohl (res);
      45          191 :   if (res > INT32_MAX)
      46           62 :     res += INT32_MIN;
      47          191 :   GNUNET_assert (res <= INT32_MAX);
      48          191 :   return (uint64_t) res;
      49              : }