paivana

commit ecfb6f19b1f9e113bc0ead00db9fde8188581084
parent e0c644bddca4bab83c3f9ec197fe5e59d1d3e9c1
Author: Christian Grothoff <christian@grothoff.org>
Date:   Mon, 20 Apr 2026 00:15:50 +0200

compute paivana hash without complex KDF as per spec

Diffstat:
M
src/backend/paivana-httpd_cookie.c
 | 
27
++++++++++++++-------------

1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/src/backend/paivana-httpd_cookie.c b/src/backend/paivana-httpd_cookie.c
@@ -1,7 +1,6 @@
 /*
   This file is part of GNU Taler
-  Copyright (C) 2012-2014 GNUnet e.V.
-  Copyright (C) 2018, 2025 Taler Systems SA
+  Copyright (C) 2026 Taler Systems SA
 
   GNU Taler is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
@@ -20,9 +19,7 @@
 */
 
 /**
- * @author Martin Schanzenbach
  * @author Christian Grothoff
- * @author Marcello Stanisci
  * @file src/backend/paivana-httpd_cookie.c
  * @brief Cookie computation logic for paivana
  */
@@ -150,21 +147,25 @@ PAIVANA_HTTPD_compute_paivana_id (struct GNUNET_TIME_Timestamp cur_time,
                                   const struct PAIVANA_Nonce *nonce)
 {
   struct GNUNET_TIME_AbsoluteNBO e;
+  struct GNUNET_HashContext *hc;
   struct GNUNET_HashCode h;
   char *end;
   char cstr[128];
   char *res;
 
   e = GNUNET_TIME_absolute_hton (cur_time.abs_time);
-  GNUNET_assert (GNUNET_YES ==
-                 GNUNET_CRYPTO_hkdf_gnunet (
-                   &h,            /* result */
-                   sizeof (h),
-                   nonce,
-                   sizeof (*nonce),
-                   &e,
-                   sizeof (e),
-                   GNUNET_CRYPTO_kdf_arg_string (website)));
+  hc = GNUNET_CRYPTO_hash_context_start ();
+  GNUNET_CRYPTO_hash_context_read (hc,
+                                   nonce,
+                                   sizeof (*nonce));
+  GNUNET_CRYPTO_hash_context_read (hc,
+                                   website,
+                                   strlen (website) + 1);
+  GNUNET_CRYPTO_hash_context_read (hc,
+                                   &e,
+                                   sizeof (e));
+  GNUNET_CRYPTO_hash_context_finish (hc,
+                                     &h);
   end = GNUNET_STRINGS_data_to_string (&h,
                                        sizeof (h),
                                        cstr,