From 963456051eeecd50702b9305802592d11d2b4b55 Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Tue, 7 Mar 2023 23:45:10 +0100
Subject: [PATCH] If public point is not found, it is computed automatically.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
---
 src/hsm/kek.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/hsm/kek.c b/src/hsm/kek.c
index bce0ae2..4eceb4d 100644
--- a/src/hsm/kek.c
+++ b/src/hsm/kek.c
@@ -704,8 +704,11 @@ int dkek_decode_key(uint8_t id,
         len = get_uint16_t(kb, ofs); ofs += 2;
         r = mbedtls_ecp_point_read_binary(&ecdsa->grp, &ecdsa->Q, kb + ofs, len);
         if (r != 0) {
-            mbedtls_ecdsa_free(ecdsa);
-            return CCID_EXEC_ERROR;
+            r = mbedtls_ecp_mul(&ecdsa->grp, &ecdsa->Q, &ecdsa->d, &ecdsa->grp.G, random_gen, NULL);
+            if (r != 0) {
+                mbedtls_ecdsa_free(ecdsa);
+                return CCID_EXEC_ERROR;
+            }
         }
         r = mbedtls_ecp_check_pub_priv(ecdsa, ecdsa, random_gen, NULL);
         if (r != 0) {