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Stefano Babic authored
Commit introduces the encryption into the swupdate class, but it breaks builds if encryption is not used at all. Fix this and rework function to retrieve key from a file. Replace os.system() with subprocess.run() - this should be done for other occurrencies od os.system() that is declared obsolete. Signed-off-by: Stefano Babic <sbabic@denx.de>
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