From d00002ee69339a23fa6522b8455b606b12600a05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Vejpustek?= <ondrej.vejpustek@satoshilabs.com>
Date: Fri, 2 Aug 2024 17:06:11 +0200
Subject: [PATCH] refactor(crypto): use secp256k1 submodule in bip32

[no changelog]
---
 crypto/bip32.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/crypto/bip32.c b/crypto/bip32.c
index ee44c24e3c..319e419409 100644
--- a/crypto/bip32.c
+++ b/crypto/bip32.c
@@ -300,8 +300,12 @@ int hdnode_public_ckd_cp(const ecdsa_curve *curve, const curve_point *parent,
     hmac_sha512(parent_chain_code, 32, data, sizeof(data), I);
     bn_read_be(I, &c);
     if (bn_is_less(&c, &curve->order)) {  // < order
-      scalar_multiply(curve, &c, child);  // b = c * G
-      point_add(curve, parent, child);    // b = a + b
+      // b = c * G
+      uint8_t child_pubkey[65] = {0};
+      ecdsa_get_public_key65(curve, I, child_pubkey);
+      ecdsa_read_pubkey(curve, child_pubkey, child);
+
+      point_add(curve, parent, child);  // b = a + b
       if (!point_is_infinity(child)) {
         if (child_chain_code) {
           memcpy(child_chain_code, I + 32, 32);