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Dependents: Encrypt_Decrypt1 mbed_blink_tls encrypt encrypt
havege.h
00001 /** 00002 * \file havege.h 00003 * 00004 * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion 00005 * 00006 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 00007 * SPDX-License-Identifier: Apache-2.0 00008 * 00009 * Licensed under the Apache License, Version 2.0 (the "License"); you may 00010 * not use this file except in compliance with the License. 00011 * You may obtain a copy of the License at 00012 * 00013 * http://www.apache.org/licenses/LICENSE-2.0 00014 * 00015 * Unless required by applicable law or agreed to in writing, software 00016 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 00017 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00018 * See the License for the specific language governing permissions and 00019 * limitations under the License. 00020 * 00021 * This file is part of mbed TLS (https://tls.mbed.org) 00022 */ 00023 #ifndef MBEDTLS_HAVEGE_H 00024 #define MBEDTLS_HAVEGE_H 00025 00026 #include <stddef.h> 00027 00028 #define MBEDTLS_HAVEGE_COLLECT_SIZE 1024 00029 00030 #ifdef __cplusplus 00031 extern "C" { 00032 #endif 00033 00034 /** 00035 * \brief HAVEGE state structure 00036 */ 00037 typedef struct 00038 { 00039 int PT1, PT2, offset[2]; 00040 int pool[MBEDTLS_HAVEGE_COLLECT_SIZE]; 00041 int WALK[8192]; 00042 } 00043 mbedtls_havege_state; 00044 00045 /** 00046 * \brief HAVEGE initialization 00047 * 00048 * \param hs HAVEGE state to be initialized 00049 */ 00050 void mbedtls_havege_init( mbedtls_havege_state *hs ); 00051 00052 /** 00053 * \brief Clear HAVEGE state 00054 * 00055 * \param hs HAVEGE state to be cleared 00056 */ 00057 void mbedtls_havege_free( mbedtls_havege_state *hs ); 00058 00059 /** 00060 * \brief HAVEGE rand function 00061 * 00062 * \param p_rng A HAVEGE state 00063 * \param output Buffer to fill 00064 * \param len Length of buffer 00065 * 00066 * \return 0 00067 */ 00068 int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len ); 00069 00070 #ifdef __cplusplus 00071 } 00072 #endif 00073 00074 #endif /* havege.h */
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