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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 signing helper implementation
- /*! \file */
- #include "epid/member/src/sign_commitment.h"
- #include "epid/common/math/ecgroup.h"
- #include "epid/common/src/commitment.h"
- /// Handle SDK Error with Break
- #define BREAK_ON_EPID_ERROR(ret) \
- if (kEpidNoErr != (ret)) { \
- break; \
- }
- EpidStatus HashSignCommitment(FiniteField* Fp, HashAlg hash_alg,
- GroupPubKey const* pub_key,
- SignCommitOutput const* commit_out,
- void const* msg, size_t msg_len,
- FpElemStr* c_str) {
- EpidStatus sts = kEpidErr;
- FfElement* c = NULL;
- if (!Fp || !commit_out || (0 != msg_len && !msg) || !c_str) {
- return kEpidBadArgErr;
- }
- do {
- CommitValues values = {0};
- sts = SetKeySpecificCommitValues(pub_key, &values);
- BREAK_ON_EPID_ERROR(sts);
- values.B = commit_out->B;
- values.K = commit_out->K;
- values.T = commit_out->T;
- values.R1 = commit_out->R1;
- values.R2 = commit_out->R2;
- sts = NewFfElement(Fp, &c);
- BREAK_ON_EPID_ERROR(sts);
- // 5. The member computes t3 = Fp.hash(p || g1 || g2 || h1 || h2
- // || w || B || K || T || R1 || R2).
- // 6. The member computes c = Fp.hash(t3 || m).
- sts = CalculateCommitmentHash(&values, Fp, hash_alg, msg, msg_len, 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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