From 865eafb1f3bbbb1601eb9019607879dbf3cef015 Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Tue, 5 Sep 2023 00:25:39 +0200
Subject: [PATCH] Fix Curve25519 key import.

For an unknown reason, curve25519 keys are imported in big endian instead of little endian.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
---
 src/openpgp/openpgp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/openpgp/openpgp.c b/src/openpgp/openpgp.c
index f65d69f..eeb47ed 100644
--- a/src/openpgp/openpgp.c
+++ b/src/openpgp/openpgp.c
@@ -1984,7 +1984,13 @@ static int cmd_import_data() {
             return SW_FUNC_NOT_SUPPORTED();
         }
         mbedtls_ecdsa_init(&ecdsa);
-        r = mbedtls_ecp_read_key(gid, &ecdsa, p[1], len[1]);
+        if (gid == MBEDTLS_ECP_DP_CURVE25519) {
+            mbedtls_ecp_group_load(&ecdsa.grp, gid);
+            r = mbedtls_mpi_read_binary(&ecdsa.d, p[1], len[1]);
+        }
+        else {
+            r = mbedtls_ecp_read_key(gid, &ecdsa, p[1], len[1]);
+        }
         if (r != 0) {
             mbedtls_ecdsa_free(&ecdsa);
             return SW_EXEC_ERROR();