1 /*
2  * Copyright (C) 2016 The Android Open Source Project
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 #include "ScryptParameters.h"
18 
19 #include <stdlib.h>
20 #include <string.h>
21 
parse_scrypt_parameters(const char * paramstr,int * Nf,int * rf,int * pf)22 bool parse_scrypt_parameters(const char* paramstr, int* Nf, int* rf, int* pf) {
23     int params[3] = {};
24     char* token;
25     char* saveptr;
26     int i;
27 
28     /*
29      * The token we're looking for should be three integers separated by
30      * colons (e.g., "12:8:1"). Scan the property to make sure it matches.
31      */
32     for (i = 0, token = strtok_r(const_cast<char*>(paramstr), ":", &saveptr);
33          token != nullptr && i < 3; i++, token = strtok_r(nullptr, ":", &saveptr)) {
34         char* endptr;
35         params[i] = strtol(token, &endptr, 10);
36 
37         /*
38          * Check that there was a valid number and it's 8-bit.
39          */
40         if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) {
41             return false;
42         }
43     }
44     if (token != nullptr) {
45         return false;
46     }
47     *Nf = params[0];
48     *rf = params[1];
49     *pf = params[2];
50     return true;
51 }
52