blinding: fix backward compatability of get_master_blinding_key() #266

	name: GitHub Actions test
	on: [push]
	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- name: Checkout repo
	uses: actions/checkout@v2
	with:
	submodules: 'recursive'
	- name: esp-idf build
	uses: espressif/esp-idf-ci-action@v1
	with:
	esp_idf_version: v5.1.2
	target: esp32
	command: idf.py -D SDKCONFIG_DEFAULTS="configs/sdkconfig_jade_v1_1.defaults" build all size-components size

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