mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-23 21:05:46 +01:00
75976895c6
Split crypto_driver.h into 4: * crypto_driver_common.h for common definitions, not meant to be included directly by driver code. * crypto_accel_driver.h for drivers that work with transparent key material. * crypto_se_driver.h for drivers that work with opaque key material. * crypto_entropy_driver.h for drivers of entropy sources. There is no code change in this commit, I only moved some code around.
112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
/**
|
|
* \file psa/crypto_entropy_driver.h
|
|
* \brief PSA entropy source driver module
|
|
*
|
|
* This header declares types and function signatures for entropy sources.
|
|
*
|
|
* This file is part of the PSA Crypto Driver Model, containing functions for
|
|
* driver developers to implement to enable hardware to be called in a
|
|
* standardized way by a PSA Cryptographic API implementation. The functions
|
|
* comprising the driver model, which driver authors implement, are not
|
|
* intended to be called by application developers.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2018, 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.
|
|
*/
|
|
#ifndef PSA_CRYPTO_ENTROPY_DRIVER_H
|
|
#define PSA_CRYPTO_ENTROPY_DRIVER_H
|
|
|
|
#include "crypto_driver_common.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** \defgroup driver_rng Entropy Generation
|
|
*/
|
|
/**@{*/
|
|
|
|
/** \brief A hardware-specific structure for a entropy providing hardware
|
|
*/
|
|
typedef struct psa_drv_entropy_context_s psa_drv_entropy_context_t;
|
|
|
|
/** \brief Initialize an entropy driver
|
|
*
|
|
*
|
|
* \param[in,out] p_context A hardware-specific structure
|
|
* containing any context information for
|
|
* the implementation
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_entropy_init_t)(psa_drv_entropy_context_t *p_context);
|
|
|
|
/** \brief Get a specified number of bits from the entropy source
|
|
*
|
|
* It retrives `buffer_size` bytes of data from the entropy source. The entropy
|
|
* source will always fill the provided buffer to its full size, however, most
|
|
* entropy sources have biases, and the actual amount of entropy contained in
|
|
* the buffer will be less than the number of bytes.
|
|
* The driver will return the actual number of bytes of entropy placed in the
|
|
* buffer in `p_received_entropy_bytes`.
|
|
* A PSA Crypto API implementation will likely feed the output of this function
|
|
* into a Digital Random Bit Generator (DRBG), and typically has a minimum
|
|
* amount of entropy that it needs.
|
|
* To accomplish this, the PSA Crypto implementation should be designed to call
|
|
* this function multiple times until it has received the required amount of
|
|
* entropy from the entropy source.
|
|
*
|
|
* \param[in,out] p_context A hardware-specific structure
|
|
* containing any context information
|
|
* for the implementation
|
|
* \param[out] p_buffer A caller-allocated buffer for the
|
|
* retrieved entropy to be placed in
|
|
* \param[in] buffer_size The allocated size of `p_buffer`
|
|
* \param[out] p_received_entropy_bits The amount of entropy (in bits)
|
|
* actually provided in `p_buffer`
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_entropy_get_bits_t)(psa_drv_entropy_context_t *p_context,
|
|
uint8_t *p_buffer,
|
|
uint32_t buffer_size,
|
|
uint32_t *p_received_entropy_bits);
|
|
|
|
/**
|
|
* \brief A struct containing all of the function pointers needed to interface
|
|
* to an entropy source
|
|
*
|
|
* PSA Crypto API implementations should populate instances of the table as
|
|
* appropriate upon startup.
|
|
*
|
|
* If one of the functions is not implemented, it should be set to NULL.
|
|
*/
|
|
typedef struct {
|
|
/** Function that performs initialization for the entropy source */
|
|
psa_drv_entropy_init_t *p_init;
|
|
/** Function that performs the get_bits operation for the entropy source
|
|
*/
|
|
psa_drv_entropy_get_bits_t *p_get_bits;
|
|
} psa_drv_entropy_t;
|
|
/**@}*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PSA_CRYPTO_ENTROPY_DRIVER_H */
|