[lsd0001] branch master updated: Fix h mod L with 512 bit value

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martin-schanzenbach pushed a commit to branch master
in repository lsd0001.

The following commit(s) were added to refs/heads/master by this push:
     new d403142  Fix h mod L with 512 bit value
d403142 is described below

commit d4031428d0ab9d79252364a5cb491d958e451282
Author: Martin Schanzenbach <schanzen@gnunet.org>
AuthorDate: Wed Jul 19 10:22:22 2023 +0200

    Fix h mod L with 512 bit value
---
 draft-schanzen-gns.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/draft-schanzen-gns.xml b/draft-schanzen-gns.xml
index 8abe7ef..fee6fc9 100644
--- a/draft-schanzen-gns.xml
+++ b/draft-schanzen-gns.xml
@@ -1350,7 +1350,7 @@ ZKDF(zk,label):
   PRK_h := HKDF-Extract ("key-derivation", zk)
   h := HKDF-Expand (PRK_h, label || "gns", 512 / 8)
   /* Ensure that h == h mod L */
-  h[31] &= 7
+  h = h mod L
 
   zk' := h * zk
   return zk'
@@ -1419,7 +1419,7 @@ SignDerived(d,label,message):
   PRK_h := HKDF-Extract ("key-derivation", zk)
   h := HKDF-Expand (PRK_h, label || "gns", 512 / 8)
   /* Ensure that h == h mod L */
-  h[31] &= 7
+  h = h mod L
 
   zk' := h * zk
   a1 := a >> 3

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