[taler-exchange] 05/11: simplify hash generation of age commitment

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oec pushed a commit to branch master
in repository exchange.

commit e3d5672cbd8fdcbc7df9c52f90b7d639ad1675d9
Author: Özgür Kesim <oec-taler@kesim.org>
AuthorDate: Sat Mar 11 11:48:44 2023 +0100

    simplify hash generation of age commitment
---
 src/util/crypto.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/src/util/crypto.c b/src/util/crypto.c
index d164b8a5..bb14b6cd 100644
--- a/src/util/crypto.c
+++ b/src/util/crypto.c
@@ -421,19 +421,23 @@ TALER_coin_pub_hash (const struct 
TALER_CoinSpendPublicKeyP *coin_pub,
   {
     /* Coin comes with age commitment.  Take the hash of the age commitment
      * into account */
-    const size_t key_s = sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey);
-    const size_t age_s = sizeof(struct TALER_AgeCommitmentHash);
-    char data[key_s + age_s];
-
-    GNUNET_memcpy (&data[0],
-                   &coin_pub->eddsa_pub,
-                   key_s);
-    GNUNET_memcpy (&data[key_s],
-                   ach,
-                   age_s);
-    GNUNET_CRYPTO_hash (&data,
-                        key_s + age_s,
-                        &coin_h->hash);
+    struct GNUNET_HashContext *hash_context;
+
+    hash_context = GNUNET_CRYPTO_hash_context_start ();
+
+    GNUNET_CRYPTO_hash_context_read (
+      hash_context,
+      &coin_pub->eddsa_pub,
+      sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey));
+
+    GNUNET_CRYPTO_hash_context_read (
+      hash_context,
+      ach,
+      sizeof(struct TALER_AgeCommitmentHash));
+
+    GNUNET_CRYPTO_hash_context_finish (
+      hash_context,
+      &coin_h->hash);
   }
 }
 

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