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diff --git a/fcp/secagg/server/secagg_server_r1_share_keys_state.h b/fcp/secagg/server/secagg_server_r1_share_keys_state.h
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+/*
+ * Copyright 2019 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_SERVER_SECAGG_SERVER_R1_SHARE_KEYS_STATE_H_
+#define FCP_SECAGG_SERVER_SECAGG_SERVER_R1_SHARE_KEYS_STATE_H_
+
+#include <memory>
+#include <string>
+
+#include "fcp/secagg/server/secagg_server_state.h"
+
+namespace fcp {
+namespace secagg {
+
+// This class is the State for the SecAggServer when it is in the
+// Round 1: Share Keys state. This state collects encrypted key shares from
+// clients, and at the end of the round, delivers the appropriate shares to the
+// right clients. It should transition to Round 2: Masked Input Collection, but
+// might transition to Aborted if too many clients abort.
+
+class SecAggServerR1ShareKeysState : public SecAggServerState {
+ public:
+  SecAggServerR1ShareKeysState(
+      std::unique_ptr<SecAggServerProtocolImpl> impl,
+      int number_of_clients_failed_after_sending_masked_input,
+      int number_of_clients_failed_before_sending_masked_input,
+      int number_of_clients_terminated_without_unmasking);
+
+  ~SecAggServerR1ShareKeysState() override;
+
+  // Handles a share keys response or abort message from a client.
+  Status HandleMessage(uint32_t client_id,
+                       const ClientToServerWrapperMessage& message) override;
+
+  bool IsNumberOfIncludedInputsCommitted() const override;
+
+  int MinimumMessagesNeededForNextRound() const override;
+
+  int NumberOfPendingClients() const override;
+
+  StatusOr<std::unique_ptr<SecAggServerState>> ProceedToNextRound() override;
+
+  // This will return true only after minimum_number_of_clients_to_proceed
+  // clients have sent messages (and not subsequently aborted).
+  bool ReadyForNextRound() const override;
+
+ private:
+  void HandleAbortClient(uint32_t client_id,
+                         ClientDropReason reason_code) override;
+};
+
+}  // namespace secagg
+}  // namespace fcp
+
+#endif  // FCP_SECAGG_SERVER_SECAGG_SERVER_R1_SHARE_KEYS_STATE_H_