75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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/**
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* \file havege.h
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*
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* \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_HAVEGE_H
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#define MBEDTLS_HAVEGE_H
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#include <stddef.h>
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#define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief HAVEGE state structure
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*/
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typedef struct
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{
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int PT1, PT2, offset[2];
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int pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
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int WALK[8192];
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}
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mbedtls_havege_state;
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/**
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* \brief HAVEGE initialization
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*
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* \param hs HAVEGE state to be initialized
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*/
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void mbedtls_havege_init( mbedtls_havege_state *hs );
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/**
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* \brief Clear HAVEGE state
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*
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* \param hs HAVEGE state to be cleared
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*/
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void mbedtls_havege_free( mbedtls_havege_state *hs );
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/**
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* \brief HAVEGE rand function
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*
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* \param p_rng A HAVEGE state
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* \param output Buffer to fill
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* \param len Length of buffer
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*
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* \return 0
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*/
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int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
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#ifdef __cplusplus
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}
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#endif
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#endif /* havege.h */
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