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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.
*/
// Helper functions that enable conversion between ElGamal structs and protocol
// buffer messsages.
#ifndef UTIL_ELGAMAL_PROTO_UTIL_H_
#define UTIL_ELGAMAL_PROTO_UTIL_H_
#include "crypto/context.h"
#include "crypto/ec_group.h"
#include "crypto/elgamal.h"
#include "crypto/elgamal.pb.h"
namespace private_join_and_compute::elgamal_proto_util {
// Converts a struct elgamal::PublicKey into a protocol buffer
// ::private_join_and_compute::ElGamalPublicKey.
StatusOr<ElGamalPublicKey> SerializePublicKey(
const elgamal::PublicKey& public_key_struct);
// Converts a protocol buffer ElGamalPublicKey into a struct
// elgamal::PublicKey. ec_group is used for ECPoint operations.
StatusOr<std::unique_ptr<elgamal::PublicKey>> DeserializePublicKey(
const ECGroup* ec_group, const ElGamalPublicKey& public_key_proto);
// Converts a struct elgamal::PrivateKey into a protocol buffer
// ::private_join_and_compute::ElGamalSecretKey.
StatusOr<::private_join_and_compute::ElGamalSecretKey> SerializePrivateKey(
const elgamal::PrivateKey& private_key_struct);
// Converts a protocol buffer ::private_join_and_compute::ElGamalSecretKey into
// a struct elgamal::PrivateKey. context is used for BigNum operations.
StatusOr<std::unique_ptr<elgamal::PrivateKey>> DeserializePrivateKey(
Context* context,
const ::private_join_and_compute::ElGamalSecretKey& private_key_proto);
// Converts a struct elgamal::Ciphertext into a protocol buffer
// ::private_join_and_compute::ElGamalCiphertext.
StatusOr<ElGamalCiphertext> SerializeCiphertext(
const elgamal::Ciphertext& ciphertext_struct);
// Converts a protocol buffer ElGamalCiphertext into a struct
// elgamal::Ciphertext. ec_group is used for ECPoint operations.
StatusOr<elgamal::Ciphertext> DeserializeCiphertext(
const ECGroup* ec_group, const ElGamalCiphertext& ciphertext_proto);
} // namespace private_join_and_compute::elgamal_proto_util
#endif // UTIL_ELGAMAL_PROTO_UTIL_H_
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