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-rw-r--r--src/exchangedb/pg_compute_shard.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/src/exchangedb/pg_compute_shard.c b/src/exchangedb/pg_compute_shard.c
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index 000000000..1dea591f1
--- /dev/null
+++ b/src/exchangedb/pg_compute_shard.c
@@ -0,0 +1,49 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2022 Taler Systems SA
+
+ TALER 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, or (at your option) any later version.
+
+ TALER 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file exchangedb/pg_compute_shard.c
+ * @brief Implementation of the compute_shard function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+#include "pg_compute_shard.h"
+#include "pg_helper.h"
+
+
+uint64_t
+TEH_PG_compute_shard (const struct TALER_MerchantPublicKeyP *merchant_pub)
+{
+ uint32_t res;
+
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CRYPTO_kdf (&res,
+ sizeof (res),
+ merchant_pub,
+ sizeof (*merchant_pub),
+ "VOID",
+ 4,
+ NULL, 0));
+ /* interpret hash result as NBO for platform independence,
+ convert to HBO and map to [0..2^31-1] range */
+ res = ntohl (res);
+ if (res > INT32_MAX)
+ res += INT32_MIN;
+ GNUNET_assert (res <= INT32_MAX);
+ return (uint64_t) res;
+}