From 18a2fae3b594f7ef54104b708d00641f6ed5de1e Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 18 Sep 2022 17:36:35 +0200
Subject: add new signature functions for DD31

---
 src/util/util.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/util/util.c')

diff --git a/src/util/util.c b/src/util/util.c
index 2d10fd69..f715456d 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -217,6 +217,31 @@ TALER_denom_fee_check_currency (
 }
 
 
+/**
+ * Hash normalized @a j JSON object or array and
+ * store the result in @a hc.
+ *
+ * @param j JSON to hash
+ * @param[out] hc where to write the hash
+ */
+void
+TALER_json_hash (const json_t *j,
+                 struct GNUNET_HashCode *hc)
+{
+  char *cstr;
+  size_t clen;
+
+  cstr = json_dumps (j,
+                     JSON_COMPACT | JSON_SORT_KEYS);
+  GNUNET_assert (NULL != cstr);
+  clen = strlen (cstr);
+  GNUNET_CRYPTO_hash (cstr,
+                      clen,
+                      hc);
+  free (cstr);
+}
+
+
 #ifdef __APPLE__
 char *
 strchrnul (const char *s,
-- 
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