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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_rng.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_rng.h
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--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_rng.h
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+/**
+ * Copyright (c) 2016 - 2018, Nordic Semiconductor ASA
+ * 
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ * 
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+#ifndef NRF_DRV_RNG_H__
+#define NRF_DRV_RNG_H__
+
+#include <nrfx_rng.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup nrf_drv_rng RNG driver - legacy layer
+ * @{
+ * @ingroup  nrf_rng
+ *
+ * @brief    Layer providing compatibility with the former API.
+ */
+
+/** @brief Type definition for forwarding the new implementation. */
+typedef nrfx_rng_config_t   nrf_drv_rng_config_t;
+
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_DRV_RNG_DEFAULT_CONFIG  NRFX_RNG_DEFAULT_CONFIG
+
+/**
+ * @brief Function for initializing the nrf_drv_rng module.
+ *
+ * @param[in]  p_config                 Initial configuration.
+ *
+ * @retval  NRF_SUCCESS                             Driver was successfully initialized.
+ * @retval  NRF_ERROR_MODULE_ALREADY_INITIALIZED    Driver was already initialized.
+ */
+ret_code_t nrf_drv_rng_init(nrf_drv_rng_config_t const * p_config);
+
+/**
+ * @brief Function for uninitializing the nrf_drv_rng module.
+ */
+void nrf_drv_rng_uninit(void);
+
+/**
+ * @brief Function for getting the number of currently available random bytes.
+ *
+ * @param[out] p_bytes_available        The number of bytes currently available in the pool.
+ */
+void nrf_drv_rng_bytes_available(uint8_t * p_bytes_available);
+
+/**
+ * @brief Function for getting the vector of random numbers.
+ *
+ * @param[out] p_buff                   Pointer to uint8_t buffer for storing the bytes.
+ * @param[in]  length                   Number of bytes to take from the pool and place in p_buff.
+ *
+ * @retval     NRF_SUCCESS              If the requested bytes were written to p_buff.
+ * @retval     NRF_ERROR_NOT_FOUND      If no bytes were written to the buffer because there were
+ *                                      not enough bytes available in the pool.
+ */
+ret_code_t nrf_drv_rng_rand(uint8_t * p_buff, uint8_t length);
+
+/**
+ * @brief Blocking function for getting an arbitrary array of random numbers.
+ *
+ * @note This function may execute for a substantial amount of time depending on the length
+ *       of the buffer required and on the state of the current internal pool of random numbers.
+ *
+ * @param[out] p_buff                   Pointer to uint8_t buffer for storing the bytes.
+ * @param[in]  length                   Number of bytes place in p_buff.
+ */
+void nrf_drv_rng_block_rand(uint8_t * p_buff, uint32_t length);
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_DRV_RNG_H__