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