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
22bool 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;
34            i++, token = strtok_r(nullptr, ":", &saveptr)) {
35        char *endptr;
36        params[i] = strtol(token, &endptr, 10);
37
38        /*
39         * Check that there was a valid number and it's 8-bit.
40         */
41        if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) {
42            return false;
43        }
44    }
45    if (token != nullptr) {
46        return false;
47    }
48    *Nf = params[0]; *rf = params[1]; *pf = params[2];
49    return true;
50}
51