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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/nrf_oberon/include/occ_constant_time.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/nrf_oberon/include/occ_constant_time.h
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+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/nrf_oberon/include/occ_constant_time.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.
+ * 
+ */
+
+/**@file
+ * Collection of timing-invariant implementations of basic functions.
+ */
+
+#ifndef OCC_CONSTANT_TIME_H
+#define OCC_CONSTANT_TIME_H
+
+#include <stddef.h>
+
+
+/**
+ * Variable length comparison.
+ *
+ * **Example**
+ * @include occ_constant_time_equal.c
+ *
+ * @param x      Memory region to compare with @p y.
+ * @param y      Memory region to compare with @p x.
+ * @param length Number of bytes to compare, @p length > 0.
+ *
+ * @returns 1 If @p x and @p y point to equal memory regions.
+ * @returns 0 Otherwise.
+ */
+int occ_constant_time_equal(const void *x, const void *y, size_t length);
+
+/**
+ * Variable length compare to zero.
+ *
+ * **Example**
+ * @include occ_constant_time_is_zero.c
+ *
+ * @param x      Pointer to memory region that will be compared.
+ * @param length Number of bytes to compare, @p length > 0.
+ *
+ * @returns 1 If @p x is equal to a zero memory regions.
+ * @returns 0 Otherwise.
+ */
+int occ_constant_time_is_zero(const void *x, size_t length);
+
+#endif