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/*############################################################################
# Copyright 2016 Intel Corporation
#
# 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.
############################################################################*/
/*!
* \file
* \brief FiniteField C++ wrapper implementation.
*/
#include "epid/common-testhelper/errors-testhelper.h"
#include "epid/common/math/bignum.h"
#include "epid/common-testhelper/finite_field_wrapper-testhelper.h"
#include "epid/common-testhelper/ffelement_wrapper-testhelper.h"
/// finite field deleter type
struct FiniteFieldDeleter {
/// finite field deleter
void operator()(FiniteField* ff) {
if (ff) {
DeleteFiniteField(&ff);
}
}
};
/// finite field deleter singlton
FiniteFieldDeleter finite_field_deleter;
/// Internal state of the finite field wrapper
struct FiniteFieldObj::State {
/// Inner state of complex fields
struct InnerState {
/// The ground field
FiniteFieldObj gf_;
/// The ground element
FfElementObj ge_;
};
/// Inner state
/*!
We store a pointer to InnerState so simple fields
that are not composed from other fields do not result
in an infinite series of fields.
Instead simple fields have a NULL inner_state and
complex fields have it set.
*/
InnerState* inner_state;
/// The stored FiniteField
std::shared_ptr<FiniteField> ff_;
/// Maximum size of field element
size_t size_;
/// constructor
State() : ff_(nullptr, finite_field_deleter), size_(0) {
inner_state = nullptr;
}
// State instances are not meant to be copied.
// Explicitly delete copy constructor and assignment operator.
State(const State&) = delete;
State& operator=(const State&) = delete;
/// destructor
~State() {
if (inner_state) {
delete inner_state;
inner_state = nullptr;
}
}
/// setter for inner_state
void SetInnerState(FiniteFieldObj const& gf, FfElementObj const& ge) {
if (!inner_state) {
inner_state = new InnerState;
inner_state->gf_ = gf;
inner_state->ge_ = ge;
}
}
/// setter for inner_state
void SetInnerState(InnerState* state) {
if (state) {
if (!inner_state) {
inner_state = new InnerState;
}
if (!inner_state) {
inner_state->gf_ = state->gf_;
inner_state->ge_ = state->ge_;
}
} else {
if (inner_state) {
delete inner_state;
inner_state = nullptr;
}
}
}
};
FiniteFieldObj::FiniteFieldObj() : state_(new State()) {
/*
to avoid a bug in ipp this is one less than the
actual max value we could take.
*/
const BigNumStr max_prime = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFe};
FiniteField* temp = nullptr;
NewFiniteField(&max_prime, &temp);
state_->ff_.reset(temp, finite_field_deleter);
state_->size_ = sizeof(max_prime);
}
FiniteFieldObj::FiniteFieldObj(FiniteFieldObj const& other)
: state_(new State) {
state_->ff_ = other.state_->ff_;
state_->size_ = other.state_->size_;
state_->SetInnerState(other.state_->inner_state);
}
FiniteFieldObj& FiniteFieldObj::operator=(FiniteFieldObj const& other) {
state_->ff_ = other.state_->ff_;
state_->size_ = other.state_->size_;
state_->SetInnerState(other.state_->inner_state);
return *this;
}
FiniteFieldObj::FiniteFieldObj(BigNumStr const& prime) : state_(new State) {
FiniteField* temp = nullptr;
NewFiniteField(&prime, &temp);
state_->ff_.reset(temp, finite_field_deleter);
state_->size_ = sizeof(prime);
}
FiniteFieldObj::FiniteFieldObj(FiniteFieldObj const& ground_field,
FfElementObj const& ground_element, int degree)
: state_(new State) {
FiniteField* temp = nullptr;
state_->SetInnerState(ground_field, ground_element);
NewFiniteFieldViaBinomalExtension(ground_field, ground_element, degree,
&temp);
state_->ff_.reset(temp, finite_field_deleter);
state_->size_ = ground_field.GetElementMaxSize() * degree;
}
FiniteFieldObj::~FiniteFieldObj() {}
FiniteFieldObj::operator FiniteField*() { return state_->ff_.get(); }
FiniteFieldObj::operator const FiniteField*() const {
return state_->ff_.get();
}
FiniteField* FiniteFieldObj::get() { return state_->ff_.get(); }
FiniteField const* FiniteFieldObj::getc() const { return state_->ff_.get(); }
size_t FiniteFieldObj::GetElementMaxSize() const { return state_->size_; }
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