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/*############################################################################
# Copyright 2016-2017 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 FfElement C++ wrapper implementation.
*/
#include "epid/common-testhelper/ffelement_wrapper-testhelper.h"
#include "epid/common-testhelper/errors-testhelper.h"
#include "epid/common-testhelper/finite_field_wrapper-testhelper.h"
#include "epid/common/math/bignum.h"
/// ffelement deleter type
struct FfElementDeleter {
/// ffelement deleter
void operator()(FfElement* ffe) {
if (ffe) {
DeleteFfElement(&ffe);
}
}
};
/// ffelement deleter singlton
FfElementDeleter ff_element_deleter;
/// Internal state of the ffelement wrapper
struct FfElementObj::State {
/// The containing field
FiniteFieldObj ff_;
/// size of the element data
size_t size;
/// The stored FfElement
std::shared_ptr<FfElement> ffe_;
State() : ff_(), size(0), ffe_() {}
/// write a new value
void write(FiniteFieldObj* ff, unsigned char const* buf, size_t buflen) {
ff_ = *ff;
bool orig_has_data = (buf != nullptr) && (buflen > 0);
std::shared_ptr<FfElement> ffe;
FfElement* ffe_ptr;
THROW_ON_EPIDERR(NewFfElement(ff_, &ffe_ptr));
ffe.reset(ffe_ptr, ff_element_deleter);
size = buflen;
if (orig_has_data) {
THROW_ON_EPIDERR(ReadFfElement(ff_, buf, buflen, ffe.get()));
}
ffe_ = ffe;
}
};
FfElementObj::FfElementObj() : state_(new State) {}
FfElementObj::FfElementObj(FfElementObj const& other) : state_(new State) {
std::vector<unsigned char> buf = other.data();
state_->write(&other.state_->ff_, &buf[0], buf.size());
}
FfElementObj& FfElementObj::operator=(FfElementObj const& other) {
std::vector<unsigned char> buf = other.data();
state_->write(&other.state_->ff_, &buf[0], buf.size());
return *this;
}
FfElementObj::FfElementObj(FiniteFieldObj* ff) : state_(new State) {
state_->write(ff, nullptr, 0);
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, FpElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, FqElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, Fq2ElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, Fq3ElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, Fq6ElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, Fq12ElemStr const& bytes)
: state_(new State) {
init(ff, (unsigned char*)&bytes, sizeof(bytes));
}
FfElementObj::FfElementObj(FiniteFieldObj* ff,
std::vector<unsigned char> const& bytes)
: state_(new State) {
init(ff, &bytes[0], bytes.size());
}
FfElementObj::FfElementObj(FiniteFieldObj* ff, void const* bytes, size_t size)
: state_(new State) {
init(ff, (unsigned char const*)bytes, size);
}
void FfElementObj::init(FiniteFieldObj* ff, unsigned char const* bytes,
size_t size) {
state_->write(ff, bytes, size);
}
FfElementObj::~FfElementObj() {}
FfElementObj::operator FfElement*() { return state_->ffe_.get(); }
FfElementObj::operator const FfElement*() const { return state_->ffe_.get(); }
FfElement* FfElementObj::get() { return state_->ffe_.get(); }
FfElement const* FfElementObj::getc() const { return state_->ffe_.get(); }
std::vector<unsigned char> FfElementObj::data() const {
std::vector<unsigned char> buf;
if (state_->ffe_.get() != nullptr) {
buf.resize(state_->ff_.GetElementMaxSize());
THROW_ON_EPIDERR(
WriteFfElement(state_->ff_, state_->ffe_.get(), &buf[0], buf.size()));
}
return buf;
}
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