mirror of https://github.com/ARMmbed/mbed-os.git
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
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* shared_rng.h
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*
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* Copyright (C) 2019-2020, 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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*/
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#ifndef SHARED_RNG_H
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#define SHARED_RNG_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_SSL_CONF_RNG)
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#define MBED_SHARED_RNG_NOT_INITIALIZED -1 /**< init_global_rng not called before global_rng */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "mbedtls/hmac_drbg.h"
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#include "mbedtls/entropy.h"
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/**
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* \brief Initializes hmac ready for rng
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*
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* \return 0 if successful, or
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* MBEDTLS_ERR_MD_BAD_INPUT_DATA, or
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* MBEDTLS_ERR_MD_ALLOC_FAILED, or
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* MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED.
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*/
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int init_global_rng();
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/**
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* \brief Global HMAC_DRBG generate random
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*
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* \note Automatically reseeds if reseed_counter is reached or PR is enabled.
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* \note init_global_rng function must be called
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* before calling this function!
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*
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* \param ctx DRBG context
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* \param dst Buffer to fill
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* \param len Length of the buffer
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*
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* \return 0 if successful, or
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* MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or
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* MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG or
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* MBED_SHARED_RNG_NOT_INITIALIZED
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*/
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int global_rng( void *ctx, unsigned char *dst, size_t len );
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/**
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* \brief Free allocated resources
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*/
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void free_global_rng();
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/**
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* \brief Getter function for global hmac context
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*
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* \return global hmac context
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*/
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mbedtls_hmac_drbg_context *get_global_hmac_drbg();
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/**
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* \brief Getter function for global entropy context
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*
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* \return global entropy context
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*/
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mbedtls_entropy_context *get_global_entropy();
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#ifdef __cplusplus
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}
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#endif
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#endif // MBEDTLS_SSL_CONF_RNG
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#endif // SHARED_RNG_H
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