1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include "hksbnexpmod_fuzzer.h"
16
17 #include <securec.h>
18
19 #include "hks_api.h"
20 #include "hks_mem.h"
21 #include "hks_param.h"
22 #include "hks_type.h"
23
24 const int BLOB_SIZE = 10;
25 const int DOUBLE_BLOB_SIZE = 20;
26 const int TRIPLE_BLOB_SIZE = 30;
27 const int FOURFOLD_BLOB_SIZE = 40;
28
29 namespace OHOS {
DoSomethingInterestingWithMyAPI(const uint8_t * data,size_t size)30 bool DoSomethingInterestingWithMyAPI(const uint8_t *data, size_t size)
31 {
32 if (data == nullptr || size <= FOURFOLD_BLOB_SIZE) {
33 return false;
34 }
35
36 uint8_t *myData = static_cast<uint8_t *>(HksMalloc(sizeof(uint8_t) * size));
37 if (myData == nullptr) {
38 return false;
39 }
40
41 (void)memcpy_s(myData, size, data, size);
42
43 struct HksBlob x = { BLOB_SIZE, myData };
44 struct HksBlob a = { BLOB_SIZE, static_cast<uint8_t *>(myData + BLOB_SIZE) };
45 struct HksBlob e = { BLOB_SIZE, static_cast<uint8_t *>(myData + DOUBLE_BLOB_SIZE) };
46 struct HksBlob n = { BLOB_SIZE, static_cast<uint8_t *>(myData + TRIPLE_BLOB_SIZE) };
47
48 (void)HksBnExpMod(&x, &a, &e, &n);
49
50 HksFree(myData);
51 return true;
52 }
53 }
54
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)55 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
56 {
57 OHOS::DoSomethingInterestingWithMyAPI(data, size);
58 return 0;
59 }
60