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/*
* Copyright 2019 Google Inc.
* 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
*
* https://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.
*/
#ifndef EC_POINT_UTIL_H_
#define EC_POINT_UTIL_H_
#include <memory>
#include <string>
#include "absl/base/port.h"
#include "absl/strings/string_view.h"
#include "crypto/big_num.h"
#include "crypto/context.h"
#include "crypto/ec_commutative_cipher.h"
#include "crypto/ec_group.h"
#include "crypto/ec_point.h"
#include "util/status.inc"
namespace private_join_and_compute {
// ECPointUtil class to allow generating random EC points, hashing to the
// elliptic curve, and checking if strings encode curve points.
class ECPointUtil {
public:
// ECPointUtil is neither copyable nor assignable.
ECPointUtil(const ECPointUtil&) = delete;
ECPointUtil& operator=(const ECPointUtil&) = delete;
// Creates an ECPointUtil object.
// Returns INVALID_ARGUMENT status instead if the curve_id is not valid
// or INTERNAL status when crypto operations are not successful.
static StatusOr<std::unique_ptr<ECPointUtil>> Create(int curve_id);
// Returns a random EC point on the curve
StatusOr<std::string> GetRandomCurvePoint();
// Hashes the given string to the curve.
//
// Suggested default hash_type is ECCommutativeCipher::HashType::Sha256.
StatusOr<std::string> HashToCurve(absl::string_view input,
ECCommutativeCipher::HashType hash_type);
// Checks if a string represents a curve point.
// May give a false negative if an internal error occurs.
bool IsCurvePoint(absl::string_view input);
private:
ECPointUtil(std::unique_ptr<Context> context, ECGroup group);
// Context used for storing temporary values to be reused across openssl
// function calls for better performance.
std::unique_ptr<Context> context_;
// The EC Group representing the curve definition.
ECGroup group_;
};
} // namespace private_join_and_compute
#endif // EC_POINT_UTIL_H_
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