111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2019-04-25 tyx the first version
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <hw_rng.h>
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/* Used to save default RNG Context */
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static struct rt_hwcrypto_ctx *ctx_default;
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/**
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* @brief Creating RNG Context
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*
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* @param device Hardware crypto device
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*
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* @return RNG context
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*/
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struct rt_hwcrypto_ctx *rt_hwcrypto_rng_create(struct rt_hwcrypto_device *device)
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{
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struct rt_hwcrypto_ctx *ctx;
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ctx = rt_hwcrypto_ctx_create(device, HWCRYPTO_TYPE_RNG, sizeof(struct hwcrypto_rng));
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return ctx;
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}
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/**
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* @brief Destroy RNG Context
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*
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* @param ctx RNG context
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*/
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void rt_hwcrypto_rng_destroy(struct rt_hwcrypto_ctx *ctx)
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{
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/* Destroy the defaule RNG Context ? */
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if (ctx == ctx_default)
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{
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ctx_default = RT_NULL;
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}
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rt_hwcrypto_ctx_destroy(ctx);
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}
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/**
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* @brief Setting RNG default devices
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*
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* @return RT_EOK on success.
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*/
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rt_err_t rt_hwcrypto_rng_default(struct rt_hwcrypto_device *device)
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{
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struct rt_hwcrypto_ctx *tmp_ctx;
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/* if device is null, destroy default RNG Context */
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if (device == RT_NULL)
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{
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if (ctx_default)
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{
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rt_hwcrypto_rng_destroy(ctx_default);
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ctx_default = RT_NULL;
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}
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return RT_EOK;
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}
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/* Try create RNG Context */
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tmp_ctx = rt_hwcrypto_rng_create(device);
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if (tmp_ctx == RT_NULL)
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{
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return -RT_ERROR;
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}
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/* create RNG Context success, update default RNG Context */
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rt_hwcrypto_rng_destroy(ctx_default);
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ctx_default = tmp_ctx;
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return RT_EOK;
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}
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/**
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* @brief Getting Random Numbers from RNG Context
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*
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* @param ctx RNG context
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*
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* @return Random number
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*/
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rt_uint32_t rt_hwcrypto_rng_update_ctx(struct rt_hwcrypto_ctx *ctx)
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{
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if (ctx)
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{
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return ((struct hwcrypto_rng *)ctx)->ops->update((struct hwcrypto_rng *)ctx);
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}
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return 0;
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}
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/**
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* @brief Return a random number
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*
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* @return Random number
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*/
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rt_uint32_t rt_hwcrypto_rng_update(void)
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{
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/* Default device does not exist ? */
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if (ctx_default == RT_NULL)
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{
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/* try create Context from default device */
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rt_hwcrypto_rng_default(rt_hwcrypto_dev_default());
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}
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return rt_hwcrypto_rng_update_ctx(ctx_default);
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}
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