[taler-exchange] branch master updated: -ensure label has no zero bytes

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oec pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new cd5ee233 -ensure label has no zero bytes
cd5ee233 is described below

commit cd5ee2338cd0c1d2923244d3ac2cc9695c5a8e25
Author: Özgür Kesim <oec-taler@kesim.org>
AuthorDate: Tue Mar 8 11:47:51 2022 +0100

    -ensure label has no zero bytes
---
 src/util/age_restriction.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/util/age_restriction.c b/src/util/age_restriction.c
index 58db2341..92143ad0 100644
--- a/src/util/age_restriction.c
+++ b/src/util/age_restriction.c
@@ -184,7 +184,12 @@ TALER_age_commitment_derive (
       new->proof.num,
       struct TALER_AgeCommitmentPrivateKeyP);
 
-  memcpy (label, &salt, sizeof(salt));
+  {
+    /* Because GNUNET_CRYPTO_ecdsa_public_key_derive expects char * (and calls
+     * strlen on it), we must avoid 0's in the label.  */
+    uint64_t nz_salt = salt | 0x8040201008040201;
+    memcpy (label, &nz_salt, sizeof(nz_salt));
+  }
 
   /* 1. Derive the public keys */
   for (size_t i = 0; i < orig->commitment.num; i++)

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