From e18f841a34cbf244bf3f58419b5f9b4364bdc59a Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Fri, 18 Aug 2023 16:46:37 +0200
Subject: [PATCH] Fix Edwards load key.

It did not compute the correct public point.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
---
 src/fido/fido.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/fido/fido.c b/src/fido/fido.c
index 932180f..fab4a5e 100644
--- a/src/fido/fido.c
+++ b/src/fido/fido.c
@@ -282,6 +282,9 @@ int derive_key(const uint8_t *app_id,
         if (r != 0) {
             return r;
         }
+        if (curve == MBEDTLS_ECP_DP_ED25519) {
+            return mbedtls_ecp_point_edwards(&key->grp, &key->Q, &key->d, random_gen, NULL);
+        }
         return mbedtls_ecp_mul(&key->grp, &key->Q, &key->d, &key->grp.G, random_gen, NULL);
     }
     mbedtls_platform_zeroize(outk, sizeof(outk));