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lwip_random.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2017 ARM Limited
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 #ifndef LWIP_HDR_RANDOM_H
18 #define LWIP_HDR_RANDOM_H
19 
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23 
24 /** Init seed for Pseudo Random
25  *
26  * Function shall seed the pseudo-random generator. Function
27  * is called during lwip initialisation.
28  */
29 void lwip_seed_random(void);
30 
31 /** Update seed for pseudo-random generator
32  *
33  * Adds seed information to existing generator, to perturb the
34  * sequence.
35  *
36  * @param seed 64 bits of data to add to the seed.
37  */
38 void lwip_add_random_seed(uint64_t seed);
39 
40 /** Generates random number.
41  *
42  * @return 32-bit random number
43  */
44 uint32_t lwip_get_random(void);
45 
46 #ifdef __cplusplus
47 }
48 #endif
49 
50 #endif /* LWIP_HDR_RANDOM_H */
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