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diff --git a/epid/member/src/join_commitment.h b/epid/member/src/join_commitment.h
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+/*############################################################################
+  # Copyright 2017 Intel Corporation
+  #
+  # 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.
+  ############################################################################*/
+/// Host join helper APIs
+/*! \file */
+#ifndef EPID_MEMBER_SRC_JOIN_COMMITMENT_H_
+#define EPID_MEMBER_SRC_JOIN_COMMITMENT_H_
+
+#include "epid/common/errors.h"
+#include "epid/common/types.h"  // HashAlg
+
+/// \cond
+typedef struct FiniteField FiniteField;
+typedef struct G1ElemStr G1ElemStr;
+typedef struct FpElemStr FpElemStr;
+typedef struct OctStr256 OctStr256;
+typedef struct OctStr256 IssuerNonce;
+/// \endcond
+
+/// Calculates commitment hash of join commit
+/*!
+
+  \param[in] Fp
+  The finite field.
+
+  \param[in] hash_alg
+  The hash algorithm.
+
+  \param[in] pub_key
+  The public key of the group being joined.
+
+  \param[in] F_str
+  The F value of the join commit.
+
+  \param[in] R_str
+  The R value of the join commit.
+
+  \param[in] NI
+  The nonce chosen by issuer as part of join protocol.
+
+  \param[out] c_str
+  The resulting commitment hash.
+
+  \returns ::EpidStatus
+
+  \see TpmJoinCommit
+  \see TpmJoin
+
+ */
+EpidStatus HashJoinCommitment(FiniteField* Fp, HashAlg hash_alg,
+                              GroupPubKey const* pub_key,
+                              G1ElemStr const* F_str, G1ElemStr const* R_str,
+                              IssuerNonce const* NI, FpElemStr* c_str);
+
+#endif  // EPID_MEMBER_SRC_JOIN_COMMITMENT_H_