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diff --git a/fcp/secagg/client/secagg_client_r1_share_keys_input_set_state.h b/fcp/secagg/client/secagg_client_r1_share_keys_input_set_state.h
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+++ b/fcp/secagg/client/secagg_client_r1_share_keys_input_set_state.h
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+/*
+ * Copyright 2018 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
+ *
+ *      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.
+ */
+
+#ifndef FCP_SECAGG_CLIENT_SECAGG_CLIENT_R1_SHARE_KEYS_INPUT_SET_STATE_H_
+#define FCP_SECAGG_CLIENT_SECAGG_CLIENT_R1_SHARE_KEYS_INPUT_SET_STATE_H_
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "fcp/base/monitoring.h"
+#include "fcp/secagg/client/secagg_client_r1_share_keys_base_state.h"
+#include "fcp/secagg/client/secagg_client_state.h"
+#include "fcp/secagg/client/send_to_server_interface.h"
+#include "fcp/secagg/client/state_transition_listener_interface.h"
+#include "fcp/secagg/shared/aes_prng_factory.h"
+#include "fcp/secagg/shared/ecdh_key_agreement.h"
+#include "fcp/secagg/shared/input_vector_specification.h"
+#include "fcp/secagg/shared/prng.h"
+#include "fcp/secagg/shared/secagg_messages.pb.h"
+
+namespace fcp {
+namespace secagg {
+
+// This class represents the client's Round 1: Share Keys state with the input
+// already set. This state should transition to the Round 2: Masked Input
+// Collection (Input Set) state, but can also transition directly to the
+// Completed or Aborted states.
+
+class SecAggClientR1ShareKeysInputSetState
+    : public SecAggClientR1ShareKeysBaseState {
+ public:
+  SecAggClientR1ShareKeysInputSetState(
+      uint32_t max_neighbors_expected,
+      uint32_t minimum_surviving_neighbors_for_reconstruction,
+      std::unique_ptr<EcdhKeyAgreement> enc_key_agreement,
+      std::unique_ptr<SecAggVectorMap> input_map,
+      std::unique_ptr<std::vector<InputVectorSpecification> >
+          input_vector_specs,
+      std::unique_ptr<SecurePrng> prng,
+      std::unique_ptr<EcdhKeyAgreement> prng_key_agreement,
+      std::unique_ptr<SendToServerInterface> sender,
+      std::unique_ptr<StateTransitionListenerInterface> transition_listener,
+      std::unique_ptr<AesPrngFactory> prng_factory,
+      AsyncAbort* async_abort = nullptr);
+
+  ~SecAggClientR1ShareKeysInputSetState() override = default;
+
+  StatusOr<std::unique_ptr<SecAggClientState> > HandleMessage(
+      const ServerToClientWrapperMessage& message) override;
+
+  // Returns the name of this state, "R1_SHARE_KEYS_INPUT_SET".
+  std::string StateName() const override;
+
+ private:
+  friend class SecAggClientR1ShareKeysInputSetStateTest_ShareKeysRequestIsHandledCorrectlyWithDeadClient_Test;  // NOLINT
+
+  const uint32_t max_neighbors_expected_;
+  const uint32_t minimum_surviving_neighbors_for_reconstruction_;
+  std::unique_ptr<EcdhKeyAgreement> enc_key_agreement_;
+  std::unique_ptr<SecAggVectorMap> input_map_;
+  std::unique_ptr<std::vector<InputVectorSpecification> > input_vector_specs_;
+  std::unique_ptr<SecurePrng> prng_;
+  std::unique_ptr<EcdhKeyAgreement> prng_key_agreement_;
+  std::unique_ptr<AesPrngFactory> prng_factory_;
+  std::vector<ShamirShare> self_prng_key_shares_;
+  std::vector<ShamirShare> pairwise_prng_key_shares_;
+};
+
+}  // namespace secagg
+}  // namespace fcp
+
+#endif  // FCP_SECAGG_CLIENT_SECAGG_CLIENT_R1_SHARE_KEYS_INPUT_SET_STATE_H_