check HKDF return value in release builds to prevent zero-key signing

[diracdeltas]

fix brave/brave-browser#53225

[github-actions]

📋 Code Owners Summary

2 file(s) changed, 2 with assigned owners

2 team(s) affected: @brave/sec-team, @brave/sync-reviewers

---

Owners and Their Files

@brave/sec-team — 1 file(s)

• components/brave_rewards/core/engine/util/signer.cc

@brave/sync-reviewers — 1 file(s)

• components/brave_sync/crypto/crypto.cc

[brave-builds]

Warning

You have got a presubmit warning. Please address it if possible.

Expected one of license headers in existing files:
// Copyright (c) <year> The Brave Authors. All rights reserved.
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.

/* Copyright (c) <year> The Brave Authors. All rights reserved.
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at https://mozilla.org/MPL/2.0/. */

# Copyright (c) <year> The Brave Authors. All rights reserved.
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at https://mozilla.org/MPL/2.0/.

<!-- Copyright (c) <year> The Brave Authors. All rights reserved.
     This Source Code Form is subject to the terms of the Mozilla Public
     License, v. 2.0. If a copy of the MPL was not distributed with this file,
     You can obtain one at https://mozilla.org/MPL/2.0/. -->

Items:

components/brave_sync/crypto/crypto.cc

[AlexeyBarabash]

++

[brave-builds]

Released in v1.89.89