From 6ee5a7345296a0a104fc3630bcea56e2f9f0f513 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Wed, 8 Nov 2023 07:37:12 +0100
Subject: [PATCH] Add a comment where coordinates are expected to be normalized

---
 src/libsodium/crypto_sign/ed25519/ref10/keypair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libsodium/crypto_sign/ed25519/ref10/keypair.c b/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
index c8273a03..b43573a2 100644
--- a/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
+++ b/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
@@ -56,6 +56,7 @@ crypto_sign_ed25519_pk_to_curve25519(unsigned char *curve25519_pk,
         return -1;
     }
     fe25519_1(one_minus_y);
+    /* assumes A.Z=1 */
     fe25519_sub(one_minus_y, one_minus_y, A.Y);
     fe25519_1(x);
     fe25519_add(x, x, A.Y);