Add abstractions: TALER_exchange_deposit_{sign,verify}

This change also removes ‘struct TALER_DepositTrackPS’
from the public API.

* src/include/taler_signatures.h (struct TALER_DepositTrackPS): Delete.

* src/util/exchange_signatures.c (struct TALER_DepositTrackPS): New.
  (TALER_exchange_deposit_sign): New func.
  (TALER_exchange_deposit_verify): New func.

* src/include/taler_crypto_lib.h
  (TALER_exchange_deposit_sign): New func decl.
  (TALER_exchange_deposit_verify): New func decl.

* src/exchange/taler-exchange-httpd_deposits_get.c
  (TEH_handler_deposits_get): Rework to use ‘TALER_exchange_deposit_verify’.

* src/lib/exchange_api_deposits_get.c
  (TALER_EXCHANGE_deposits_get): Rework to use ‘taler_exchange_deposit_sign’.

1 files changed, 5 insertions, 13 deletions

diff --git a/src/exchange/taler-exchange-httpd_deposits_get.c b/src/exchange/taler-exchange-httpd_deposits_get.c
index fdb1a606c..509b8a214 100644
--- a/src/exchange/taler-exchange-httpd_deposits_get.c
+++ b/src/exchange/taler-exchange-httpd_deposits_get.c
@@ -328,20 +328,12 @@ TEH_handler_deposits_get (struct TEH_RequestContext *rc,
     return MHD_YES; /* parse error */
   TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
   {
-    struct TALER_DepositTrackPS tps = {
-      .purpose.size = htonl (sizeof (tps)),
-      .purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION),
-      .merchant = ctx.merchant,
-      .coin_pub = ctx.coin_pub,
-      .h_contract_terms = ctx.h_contract_terms,
-      .h_wire = ctx.h_wire
-    };
-
     if (GNUNET_OK !=
-        GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION,
-                                    &tps,
-                                    &merchant_sig.eddsa_sig,
-                                    &tps.merchant.eddsa_pub))
+        TALER_exchange_deposit_verify (&ctx.merchant,
+                                       &ctx.coin_pub,
+                                       &ctx.h_contract_terms,
+                                       &ctx.h_wire,
+                                       &merchant_sig))
     {
       GNUNET_break_op (0);
       return TALER_MHD_reply_with_error (rc->connection,