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      1 /*############################################################################
      2   # Copyright 2016-2017 Intel Corporation
      3   #
      4   # Licensed under the Apache License, Version 2.0 (the "License");
      5   # you may not use this file except in compliance with the License.
      6   # You may obtain a copy of the License at
      7   #
      8   #     http://www.apache.org/licenses/LICENSE-2.0
      9   #
     10   # Unless required by applicable law or agreed to in writing, software
     11   # distributed under the License is distributed on an "AS IS" BASIS,
     12   # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13   # See the License for the specific language governing permissions and
     14   # limitations under the License.
     15   ############################################################################*/
     16 
     17 /*!
     18  * \file
     19  * \brief ComputePreSig unit tests.
     20  */
     21 #include <algorithm>
     22 #include <cstring>
     23 #include <limits>
     24 #include <vector>
     25 
     26 #include "epid/common-testhelper/epid_gtest-testhelper.h"
     27 #include "gtest/gtest.h"
     28 
     29 extern "C" {
     30 #include "epid/member/api.h"
     31 }
     32 
     33 #include "epid/common-testhelper/errors-testhelper.h"
     34 #include "epid/common-testhelper/prng-testhelper.h"
     35 #include "epid/member/unittests/member-testhelper.h"
     36 
     37 /// Count of elements in array
     38 #define COUNT_OF(A) (sizeof(A) / sizeof((A)[0]))
     39 
     40 namespace {
     41 
     42 ///////////////////////////////////////////////////////////////////////
     43 // EpidAddPreSigs
     44 TEST_F(EpidMemberTest, AddPreSigsFailsGivenNullPointer) {
     45   Prng my_prng;
     46   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
     47                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
     48 
     49   EXPECT_EQ(kEpidBadArgErr, EpidAddPreSigs(nullptr, 1));
     50 }
     51 
     52 TEST_F(EpidMemberTest, AddPreSigsFailsGivenHugeNumberOfPreSigs) {
     53   Prng my_prng;
     54   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
     55                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
     56 
     57   // number_presigs = 0x80..01 of size equal to sizeof(size_t)
     58   EXPECT_NE(kEpidNoErr, EpidAddPreSigs(member, (SIZE_MAX >> 1) + 2));
     59 }
     60 
     61 TEST_F(EpidMemberTest,
     62        AddPreSigsComputesSpecifiedNumberOfPresigsIfInputPresigsNull) {
     63   Prng my_prng;
     64   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
     65                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
     66 
     67   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, 2));
     68   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, 1));
     69   // request to generate 0 pre-computed signatures do nothing
     70   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, 0));
     71   EXPECT_EQ((size_t)3, EpidGetNumPreSigs(member));
     72 }
     73 
     74 TEST_F(EpidMemberTest, AddPreSigsAddsCorrectNumberOfPresigsGivenValidInput) {
     75   Prng my_prng;
     76   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
     77                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
     78 
     79   const size_t presigs1_added = 2;
     80   const size_t presigs2_added = 3;
     81 
     82   // add
     83   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, presigs1_added));
     84   // extend
     85   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, presigs2_added));
     86   // add empty pre-computed signatures array does not affect internal pool
     87   ASSERT_EQ(kEpidNoErr, EpidAddPreSigs(member, 0));
     88   EXPECT_EQ(presigs1_added + presigs2_added, EpidGetNumPreSigs(member));
     89 }
     90 
     91 ///////////////////////////////////////////////////////////////////////
     92 // EpidGetNumPreSigs
     93 TEST_F(EpidMemberTest, GetNumPreSigsReturnsZeroGivenNullptr) {
     94   EXPECT_EQ((size_t)0, EpidGetNumPreSigs(nullptr));
     95 }
     96 
     97 TEST_F(EpidMemberTest, NumPreSigsForNewleyCreatedContextIsZero) {
     98   Prng my_prng;
     99   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
    100                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
    101 
    102   EXPECT_EQ((size_t)0, EpidGetNumPreSigs(member));
    103 }
    104 
    105 TEST_F(EpidMemberTest, GetNumPreSigsReturnsNumberOfAddedPresigs) {
    106   Prng my_prng;
    107   MemberCtxObj member(this->kGroupPublicKey, this->kMemberPrivateKey,
    108                       this->kMemberPrecomp, &Prng::Generate, &my_prng);
    109 
    110   const size_t presigs_added = 5;
    111 
    112   THROW_ON_EPIDERR(EpidAddPreSigs(member, presigs_added));
    113   EXPECT_EQ(presigs_added, EpidGetNumPreSigs(member));
    114 }
    115 
    116 }  // namespace
    117