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Roger Dingledine
0716cd7cb2
First (both client and service), make descriptor parsing not fail when suggested_effort is 0. Second (client side), if we get a descriptor with a pow_params section but with suggested_effort of 0, treat it as not requiring a pow. Third (service side), when deciding whether the suggested effort has changed, don't treat "previous suggested effort 0, new suggested effort 0" as a change. An alternative design to resolve 'first' and 'second' above would be to omit the pow_params from the descriptor when suggested_effort is 0, so clients never see the pow_params so they don't compute a pow. But I decided to include a pow_params with an explicit suggested_effort of 0, since this way the client knows the seed etc so they can solve a higher-effort pow if they want. The tradeoff is that the descriptor reveals whether HiddenServicePoWDefensesEnabled is set to 1 for this onion service, even if the AIMD calculation is currently requiring effort 0.
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