lwip_random.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2017 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #ifndef LWIP_HDR_RANDOM_H
00018 #define LWIP_HDR_RANDOM_H
00019 
00020 #ifdef __cplusplus
00021 extern "C" {
00022 #endif
00023 
00024 /** Init seed for Pseudo Random
00025  *
00026  *  Function shall seed the pseudo-random generator. Function
00027  *  is called during lwip initialisation.
00028  */
00029 void lwip_seed_random(void);
00030 
00031 /** Update seed for pseudo-random generator
00032  *
00033  *  Adds seed information to existing generator, to perturb the
00034  *  sequence.
00035  *
00036  *  @param seed     64 bits of data to add to the seed.
00037  */
00038 void lwip_add_random_seed(uint64_t seed);
00039 
00040 /** Generates random number.
00041  *
00042  *  @return         32-bit random number
00043  */
00044 uint32_t lwip_get_random(void);
00045 
00046 #ifdef __cplusplus
00047 }
00048 #endif
00049 
00050 #endif /* LWIP_HDR_RANDOM_H */