for SecureTransport backend. OpenSSL, while reading
RSA/DSA, is internally calling EVP_BytesToKey that
essentially does the same thing this patch does in
'deriveAesKey' and thus able to correctly decrypt
whatever it first encrypted (while generating/
encrypting keys).
Fixes: QTBUG-54422
Change-Id: Ia9f7599c5b19bf364c179f2abd2aab7ea5359a65
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
