1 files changed, 144 insertions, 0 deletions
diff --git a/act/fake_act.cc b/act/fake_act.cc
new file mode 100644
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--- /dev/null
+++ b/act/fake_act.cc
@@ -0,0 +1,144 @@
+/*
+ * 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