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 "platform.h"
      22             : #include "taler_error_codes.h"
      23             : #include "taler_dbevents.h"
      24             : #include "taler_pq_lib.h"
      25             : #include "pg_compute_shard.h"
      26             : #include "pg_helper.h"
      27             : 
      28             : 
      29             : uint64_t
      30         211 : TEH_PG_compute_shard (const struct TALER_MerchantPublicKeyP *merchant_pub)
      31             : {
      32             :   uint32_t res;
      33             : 
      34         211 :   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         211 :   res = ntohl (res);
      45         211 :   if (res > INT32_MAX)
      46          80 :     res += INT32_MIN;
      47         211 :   GNUNET_assert (res <= INT32_MAX);
      48         211 :   return (uint64_t) res;
      49             : }