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/*
* Copyright 2023 Google LLC.
* 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.
*/
#include "act/fake_act.h"
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "act/act.pb.h"
#include "private_join_and_compute/crypto/context.h"
namespace private_join_and_compute {
namespace anonymous_counting_tokens {
// Returns an instance of FakeAnonymousCountingTokens.
std::unique_ptr<AnonymousCountingTokens> FakeAnonymousCountingTokens::Create() {
return absl::WrapUnique<FakeAnonymousCountingTokens>(
new FakeAnonymousCountingTokens());
}
// Returns empty Server parameters.
StatusOr<ServerParameters>
FakeAnonymousCountingTokens::GenerateServerParameters(
const SchemeParameters& scheme_parameters) {
return ServerParameters::default_instance();
}
// Returns empty Client parameters.
StatusOr<ClientParameters>
FakeAnonymousCountingTokens::GenerateClientParameters(
const SchemeParameters& scheme_parameters,
const ServerPublicParameters& server_public_parameters) {
return ClientParameters::default_instance();
}
// Always returns "Ok".
Status FakeAnonymousCountingTokens::CheckClientParameters(
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ServerPublicParameters& server_public_parameters,
const ServerPrivateParameters& server_private_parameters) {
return absl::OkStatus();
}
// For this fake implementation, the client fingerprints are the same as the
// messages (this is insecure).
StatusOr<std::tuple<std::vector<std::string>, TokensRequest,
TokensRequestPrivateState>>
FakeAnonymousCountingTokens::GenerateTokensRequest(
absl::Span<const std::string> messages,
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ClientPrivateParameters& client_private_parameters,
const ServerPublicParameters& server_public_parameters) {
return std::make_tuple(
std::vector<std::string>(messages.begin(), messages.end()),
TokensRequest::default_instance(),
TokensRequestPrivateState::default_instance());
}
// Always returns "Ok".
Status FakeAnonymousCountingTokens::CheckTokensRequest(
absl::Span<const std::string> client_fingerprints,
const TokensRequest& tokens_request,
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ServerPublicParameters& server_public_parameters,
const ServerPrivateParameters& server_private_parameters) {
return absl::OkStatus();
}
// Returns an empty TokensResponse.
StatusOr<TokensResponse> FakeAnonymousCountingTokens::GenerateTokensResponse(
const TokensRequest& tokens_request,
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ServerPublicParameters& server_public_parameters,
const ServerPrivateParameters& server_private_parameters) {
return TokensResponse::default_instance();
}
// Always returns "Ok".
Status FakeAnonymousCountingTokens::VerifyTokensResponse(
absl::Span<const std::string> messages, const TokensRequest& tokens_request,
const TokensRequestPrivateState& tokens_request_private_state,
const TokensResponse& tokens_response,
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ClientPrivateParameters& client_private_parameters,
const ServerPublicParameters& server_public_parameters) {
return absl::OkStatus();
}
// Returns a set of tokens containing randomly generated "nonce" values, and
// all other fields empty.
StatusOr<std::vector<Token>> FakeAnonymousCountingTokens::RecoverTokens(
absl::Span<const std::string> messages, const TokensRequest& tokens_request,
const TokensRequestPrivateState& tokens_request_private_state,
const TokensResponse& tokens_response,
const SchemeParameters& scheme_parameters,
const ClientPublicParameters& client_public_parameters,
const ClientPrivateParameters& client_private_parameters,
const ServerPublicParameters& server_public_parameters) {
Context context;
BigNum nonce_bound = context.One().Lshift(kFakeTokenNonceLengthBits);
std::vector<Token> result;
result.reserve(messages.size());
for (size_t i = 0; i < messages.size(); ++i) {
Token fake_token;
fake_token.set_nonce_bytes(
context.GenerateRandLessThan(nonce_bound).ToBytes());
result.push_back(fake_token);
}
return std::move(result);
}
// Always returns "Ok".
Status FakeAnonymousCountingTokens::VerifyToken(
std::string m, const Token& token,
const SchemeParameters& scheme_parameters,
const ServerPublicParameters& server_public_parameters,
const ServerPrivateParameters& server_private_parameters) {
return absl::OkStatus();
}
} // namespace anonymous_counting_tokens
} // namespace private_join_and_compute
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