mirror of
https://github.com/vtnerd/monero-lws.git
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92 lines
3.7 KiB
C++
92 lines
3.7 KiB
C++
// Copyright (c) 2018-2019, The Monero Project
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <cstdint>
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#include <functional>
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#include <vector>
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#include "common/expect.h" // monero/src
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#include "rpc/message_data_structs.h" // monero/src
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#include "span.h" // monero/src
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#include "util/fwd.h"
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namespace lws
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{
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using histogram = cryptonote::rpc::output_amount_count;
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using output_ref = cryptonote::rpc::output_amount_and_index;
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using output_keys = cryptonote::rpc::output_key_mask_unlocked;
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struct random_output
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{
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output_keys keys;
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std::uint64_t index;
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};
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struct random_ring
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{
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std::vector<random_output> ring;
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std::uint64_t amount;
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};
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using key_fetcher = expect<std::vector<output_keys>>(std::vector<output_ref>);
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/*!
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Selects random outputs for use in a ring signature. `amounts` of `0`
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use a gamma distribution algorithm and all other amounts use a
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triangular distribution.
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\param mixin The number of dummy outputs per ring.
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\param amounts The amounts that need dummy outputs to be selected.
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\param pick_rct Ring-ct distribution from the daemon
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\param histograms A histogram from the daemon foreach non-zero value
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in `amounts`.
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\param fetch A function that can retrieve the keys for the randomly
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selected outputs.
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\note `histograms` is modified - the list is sorted by amount.
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\note This currenty leaks the real outputs to `fetch`, because the
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real output is not provided alongside the dummy outputs. This is a
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limitation of the current openmonero/mymonero API. When this is
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resolved, this function can possibly be moved outside of the `lws`
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namespace for use by simple wallet.
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\return Randomly selected outputs in rings of size `mixin`, one for
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each element in `amounts`. Amounts with less than `mixin` available
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are not returned. All outputs are unlocked.
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*/
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expect<std::vector<random_ring>> pick_random_outputs(
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std::uint32_t mixin,
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epee::span<const std::uint64_t> amounts,
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gamma_picker& pick_rct,
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epee::span<histogram> histograms,
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std::function<key_fetcher> fetch
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);
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}
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