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permute.cc
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permute.cc
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// Copyright 2023 Ant Group Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "libspu/mpc/aby3/permute.h"
#include "libspu/mpc/aby3/type.h"
#include "libspu/mpc/aby3/value.h"
#include "libspu/mpc/common/communicator.h"
#include "libspu/mpc/common/prg_state.h"
#include "libspu/mpc/utils/permute.h"
#include "libspu/mpc/utils/ring_ops.h"
namespace spu::mpc::aby3 {
NdArrayRef RandPermM::proc(KernelEvalContext* ctx, const Shape& shape) const {
NdArrayRef out(makeType<PShrTy>(), shape);
auto* prg_state = ctx->getState<PrgState>();
const auto& pvs = prg_state->genPrssPermPair(out.numel());
const auto& pv_self = pvs.first;
const auto& pv_next = pvs.second;
const auto field = out.eltype().as<PShrTy>()->field();
auto out1 = getFirstShare(out);
auto out2 = getSecondShare(out);
DISPATCH_ALL_FIELDS(field, [&]() {
NdArrayView<ring2k_t> _out1(out1);
NdArrayView<ring2k_t> _out2(out2);
pforeach(0, out.numel(), [&](int64_t idx) {
_out1[idx] = ring2k_t(pv_self[idx]);
_out2[idx] = ring2k_t(pv_next[idx]);
});
});
return out;
}
// Ref: https://eprint.iacr.org/2019/695.pdf
// Algorithm 9: Optimized shuffling protocol
NdArrayRef PermAM::proc(KernelEvalContext* ctx, const NdArrayRef& in,
const NdArrayRef& perm) const {
auto* comm = ctx->getState<Communicator>();
const auto numel = in.numel();
const auto field = in.eltype().as<AShrTy>()->field();
auto* prg_state = ctx->getState<PrgState>();
auto pv_self = getFirstShare(perm);
auto pv_next = getSecondShare(perm);
NdArrayRef out(in.eltype(), in.shape());
DISPATCH_ALL_FIELDS(field, [&]() {
using el_t = ring2k_t;
using shr_t = std::array<el_t, 2>;
NdArrayView<shr_t> _out(out);
NdArrayView<shr_t> _in(in);
std::vector<el_t> a0(numel);
std::vector<el_t> a1(numel);
prg_state->fillPrssPair(a0.data(), a1.data(), a0.size(),
PrgState::GenPrssCtrl::Both);
const auto pv_field = pv_self.eltype().as<Ring2k>()->field();
DISPATCH_ALL_FIELDS(pv_field, [&]() {
using pv_t = ring2k_t;
NdArrayView<pv_t> _pv_self(pv_self);
NdArrayView<pv_t> _pv_next(pv_next);
if (comm->getRank() == 0) {
std::vector<el_t> tmp(numel);
std::vector<el_t> delta(numel);
pforeach(0, numel, [&](int64_t idx) {
tmp[idx] = _in[_pv_self[idx]][0] + _in[_pv_self[idx]][1] - a0[idx];
});
pforeach(0, numel, [&](int64_t idx) {
delta[idx] = tmp[_pv_next[idx]] - a1[idx];
});
comm->sendAsync<el_t>(2, delta, "delta");
// 2to3 re-share
std::vector<el_t> r0(numel);
std::vector<el_t> r1(numel);
prg_state->fillPrssPair(r0.data(), r1.data(), r1.size(),
PrgState::GenPrssCtrl::Both);
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = r0[idx];
_out[idx][1] = r1[idx];
});
} else if (comm->getRank() == 1) {
auto gama = comm->recv<el_t>(2, "gama");
std::vector<el_t> tmp(numel);
std::vector<el_t> beta(numel);
pforeach(0, numel, [&](int64_t idx) {
tmp[idx] = gama[_pv_self[idx]] + a0[idx];
});
pforeach(0, numel,
[&](int64_t idx) { beta[idx] = tmp[_pv_next[idx]]; });
// 2to3 re-share
std::vector<el_t> r0(numel);
prg_state->fillPrssPair<el_t>(r0.data(), nullptr, r0.size(),
PrgState::GenPrssCtrl::First);
pforeach(0, numel, [&](int64_t idx) { beta[idx] -= r0[idx]; });
comm->sendAsync<el_t>(2, beta, "2to3");
tmp = comm->recv<el_t>(2, "2to3");
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = r0[idx];
_out[idx][1] = beta[idx] + tmp[idx];
});
} else if (comm->getRank() == 2) {
std::vector<el_t> gama(numel);
std::vector<el_t> beta(numel);
pforeach(0, numel, [&](int64_t idx) {
gama[idx] = _in[_pv_next[idx]][0] + a1[idx];
});
comm->sendAsync<el_t>(1, gama, "gama");
auto delta = comm->recv<el_t>(0, "delta");
pforeach(0, numel,
[&](int64_t idx) { beta[idx] = delta[_pv_self[idx]]; });
// 2to3 re-share
std::vector<el_t> r1(numel);
prg_state->fillPrssPair<el_t>(nullptr, r1.data(), r1.size(),
PrgState::GenPrssCtrl::Second);
pforeach(0, numel, [&](int64_t idx) { //
beta[idx] -= r1[idx];
});
comm->sendAsync<el_t>(1, beta, "2to3");
auto tmp = comm->recv<el_t>(1, "2to3");
// rebuild the final result.
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = beta[idx] + tmp[idx];
_out[idx][1] = r1[idx];
});
} else {
SPU_THROW("Party number exceeds 3!");
}
});
});
return out;
}
NdArrayRef PermAP::proc(KernelEvalContext* ctx, const NdArrayRef& in,
const NdArrayRef& perm) const {
NdArrayRef out(in.eltype(), in.shape());
if (out.numel() != 0) {
const auto in1 = getFirstShare(in);
const auto in2 = getSecondShare(in);
auto perm1 = applyPerm(in1, perm);
auto perm2 = applyPerm(in2, perm);
auto out1 = getFirstShare(out);
auto out2 = getSecondShare(out);
ring_assign(out1, perm1);
ring_assign(out2, perm2);
}
return out;
}
// Ref: https://eprint.iacr.org/2019/695.pdf
// Algorithm 17: Optimized unshuffling protocol
NdArrayRef InvPermAM::proc(KernelEvalContext* ctx, const NdArrayRef& in,
const NdArrayRef& perm) const {
auto* comm = ctx->getState<Communicator>();
const auto numel = in.numel();
const auto field = in.eltype().as<AShrTy>()->field();
auto* prg_state = ctx->getState<PrgState>();
auto pv_self = getFirstShare(perm);
auto pv_next = getSecondShare(perm);
NdArrayRef out(in.eltype(), in.shape());
DISPATCH_ALL_FIELDS(field, [&]() {
using el_t = ring2k_t;
using shr_t = std::array<el_t, 2>;
NdArrayView<shr_t> _out(out);
NdArrayView<shr_t> _in(in);
std::vector<el_t> a0(numel);
std::vector<el_t> a1(numel);
prg_state->fillPrssPair(a0.data(), a1.data(), a0.size(),
PrgState::GenPrssCtrl::Both);
const auto pv_field = pv_self.eltype().as<Ring2k>()->field();
DISPATCH_ALL_FIELDS(pv_field, [&]() {
using pv_t = ring2k_t;
NdArrayView<pv_t> _pv_self(pv_self);
NdArrayView<pv_t> _pv_next(pv_next);
if (comm->getRank() == 0) {
std::vector<el_t> beta(numel);
std::vector<el_t> tmp(numel);
auto gama = comm->recv<el_t>(2, "gama");
pforeach(0, numel, [&](int64_t idx) {
tmp[_pv_next[idx]] = gama[idx] + a1[_pv_next[idx]];
});
pforeach(0, numel,
[&](int64_t idx) { beta[_pv_self[idx]] = tmp[idx]; });
// 2to3 re-share
std::vector<el_t> r1(numel);
prg_state->fillPrssPair<el_t>(nullptr, r1.data(), r1.size(),
PrgState::GenPrssCtrl::Second);
pforeach(0, numel, [&](int64_t idx) { //
beta[idx] -= r1[idx];
});
comm->sendAsync<el_t>(2, beta, "2to3");
tmp = comm->recv<el_t>(2, "2to3");
// rebuild the final result.
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = beta[idx] + tmp[idx];
_out[idx][1] = r1[idx];
});
} else if (comm->getRank() == 1) {
std::vector<el_t> tmp(numel);
std::vector<el_t> delta(numel);
pforeach(0, numel, [&](int64_t idx) {
tmp[_pv_next[idx]] = _in[idx][0] + _in[idx][1] - a1[_pv_next[idx]];
});
pforeach(0, numel, [&](int64_t idx) {
delta[_pv_self[idx]] = tmp[idx] - a0[_pv_self[idx]];
});
comm->sendAsync<el_t>(2, delta, "delta");
// 2to3 re-share
std::vector<el_t> r0(numel);
std::vector<el_t> r1(numel);
prg_state->fillPrssPair(r0.data(), r1.data(), r1.size(),
PrgState::GenPrssCtrl::Both);
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = r0[idx];
_out[idx][1] = r1[idx];
});
} else if (comm->getRank() == 2) {
std::vector<el_t> gama(numel);
std::vector<el_t> beta(numel);
pforeach(0, numel, [&](int64_t idx) {
gama[_pv_self[idx]] = _in[idx][1] + a0[_pv_self[idx]];
});
comm->sendAsync<el_t>(0, gama, "gama");
auto delta = comm->recv<el_t>(1, "delta");
pforeach(0, numel,
[&](int64_t idx) { beta[_pv_next[idx]] = delta[idx]; });
// 2to3 re-share
std::vector<el_t> r0(numel);
prg_state->fillPrssPair<el_t>(r0.data(), nullptr, r0.size(),
PrgState::GenPrssCtrl::First);
pforeach(0, numel, [&](int64_t idx) { //
beta[idx] -= r0[idx];
});
comm->sendAsync<el_t>(0, beta, "2to3");
auto tmp = comm->recv<el_t>(0, "2to3");
pforeach(0, numel, [&](int64_t idx) {
_out[idx][0] = r0[idx];
_out[idx][1] = beta[idx] + tmp[idx];
});
} else {
SPU_THROW("Party number exceeds 3!");
}
});
});
return out;
}
NdArrayRef InvPermAP::proc(KernelEvalContext* ctx, const NdArrayRef& in,
const NdArrayRef& perm) const {
NdArrayRef out(in.eltype(), in.shape());
if (out.numel() != 0) {
const auto in1 = getFirstShare(in);
const auto in2 = getSecondShare(in);
auto perm1 = applyInvPerm(in1, perm);
auto perm2 = applyInvPerm(in2, perm);
auto out1 = getFirstShare(out);
auto out2 = getSecondShare(out);
ring_assign(out1, perm1);
ring_assign(out2, perm2);
}
return out;
}
} // namespace spu::mpc::aby3