1 /** 2 * \file havege.h 3 * 4 * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion 5 */ 6 /* 7 * Copyright The Mbed TLS Contributors 8 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later 9 * 10 * This file is provided under the Apache License 2.0, or the 11 * GNU General Public License v2.0 or later. 12 * 13 * ********** 14 * Apache License 2.0: 15 * 16 * Licensed under the Apache License, Version 2.0 (the "License"); you may 17 * not use this file except in compliance with the License. 18 * You may obtain a copy of the License at 19 * 20 * http://www.apache.org/licenses/LICENSE-2.0 21 * 22 * Unless required by applicable law or agreed to in writing, software 23 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 25 * See the License for the specific language governing permissions and 26 * limitations under the License. 27 * 28 * ********** 29 * 30 * ********** 31 * GNU General Public License v2.0 or later: 32 * 33 * This program is free software; you can redistribute it and/or modify 34 * it under the terms of the GNU General Public License as published by 35 * the Free Software Foundation; either version 2 of the License, or 36 * (at your option) any later version. 37 * 38 * This program is distributed in the hope that it will be useful, 39 * but WITHOUT ANY WARRANTY; without even the implied warranty of 40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 41 * GNU General Public License for more details. 42 * 43 * You should have received a copy of the GNU General Public License along 44 * with this program; if not, write to the Free Software Foundation, Inc., 45 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 46 * 47 * ********** 48 */ 49 #ifndef MBEDTLS_HAVEGE_H 50 #define MBEDTLS_HAVEGE_H 51 52 #if !defined(MBEDTLS_CONFIG_FILE) 53 #include "config.h" 54 #else 55 #include MBEDTLS_CONFIG_FILE 56 #endif 57 58 #include <stddef.h> 59 60 #define MBEDTLS_HAVEGE_COLLECT_SIZE 1024 61 62 #ifdef __cplusplus 63 extern "C" { 64 #endif 65 66 /** 67 * \brief HAVEGE state structure 68 */ 69 typedef struct mbedtls_havege_state 70 { 71 int PT1, PT2, offset[2]; 72 int pool[MBEDTLS_HAVEGE_COLLECT_SIZE]; 73 int WALK[8192]; 74 } 75 mbedtls_havege_state; 76 77 /** 78 * \brief HAVEGE initialization 79 * 80 * \param hs HAVEGE state to be initialized 81 */ 82 void mbedtls_havege_init( mbedtls_havege_state *hs ); 83 84 /** 85 * \brief Clear HAVEGE state 86 * 87 * \param hs HAVEGE state to be cleared 88 */ 89 void mbedtls_havege_free( mbedtls_havege_state *hs ); 90 91 /** 92 * \brief HAVEGE rand function 93 * 94 * \param p_rng A HAVEGE state 95 * \param output Buffer to fill 96 * \param len Length of buffer 97 * 98 * \return 0 99 */ 100 int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len ); 101 102 #ifdef __cplusplus 103 } 104 #endif 105 106 #endif /* havege.h */ 107