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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 implementation
- /*! \file */
- #include "epid/member/src/join_commitment.h"
- #include "epid/common/math/finitefield.h"
- #include "epid/common/types.h"
- /// Handle SDK Error with Break
- #define BREAK_ON_EPID_ERROR(ret) \
- if (kEpidNoErr != (ret)) { \
- break; \
- }
- #pragma pack(1)
- /// Storage for values to create commitment in Sign and Verify algorithms
- typedef struct JoinPCommitValues {
- BigNumStr p; ///< Intel(R) EPID 2.0 parameter p
- G1ElemStr g1; ///< Intel(R) EPID 2.0 parameter g1
- G2ElemStr g2; ///< Intel(R) EPID 2.0 parameter g2
- G1ElemStr h1; ///< Group public key value h1
- G1ElemStr h2; ///< Group public key value h2
- G2ElemStr w; ///< Group public key value w
- G1ElemStr F; ///< Variable F computed in algorithm
- G1ElemStr R; ///< Variable R computed in algorithm
- IssuerNonce NI; ///< Nonce
- } JoinPCommitValues;
- #pragma pack()
- 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) {
- EpidStatus sts = kEpidErr;
- FfElement* c = NULL;
- if (!Fp || !pub_key || !F_str || !R_str || !NI || !c_str) {
- return kEpidBadArgErr;
- }
- do {
- JoinPCommitValues commit_values = {0};
- Epid2Params params = {
- #include "epid/common/src/epid2params_ate.inc"
- };
- commit_values.p = params.p;
- commit_values.g1 = params.g1;
- commit_values.g2 = params.g2;
- commit_values.h1 = pub_key->h1;
- commit_values.h2 = pub_key->h2;
- commit_values.w = pub_key->w;
- commit_values.F = *F_str;
- commit_values.R = *R_str;
- commit_values.NI = *NI;
- sts = NewFfElement(Fp, &c);
- BREAK_ON_EPID_ERROR(sts);
- // Step 4. The member computes c = Fp.hash(p || g1 || g2 || h1 ||
- // h2 || w || F || R || NI).
- sts = FfHash(Fp, &commit_values, sizeof(commit_values), hash_alg, c);
- BREAK_ON_EPID_ERROR(sts);
- sts = WriteFfElement(Fp, c, c_str, sizeof(*c_str));
- BREAK_ON_EPID_ERROR(sts);
- sts = kEpidNoErr;
- } while (0);
- DeleteFfElement(&c);
- return sts;
- }
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