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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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