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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/nrf_oberon/include/occ_chacha20.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/nrf_oberon/include/occ_chacha20.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.
+ * 
+ */
+
+/*!
+ * @brief ChaCha20 is a stream cipher developed by Daniel J. Bernstein based on the 20-round cipher Salsa20/20.
+ */
+/**@file
+ * A 256-bit key is expanded into 2^64 randomly accessible streams, each
+ * containing 2^64 randomly accessible 64-byte (512 bits) blocks.
+ *
+ * The changes from Salsa20/20 to ChaCha20 are designed to improve diffusion per
+ * round, conjecturally increasing resistance to cryptanalysis, while
+ * preserving - and often improving - time per round.
+ *
+ * @see [RFC 7539 - ChaCha20 and Poly1305 for IETF Protocols](http://tools.ietf.org/html/rfc7539)
+ * @see [The ChaCha family of stream ciphers](http://cr.yp.to/chacha.html)
+ */
+
+#ifndef OCC_CHACHA20_H
+#define OCC_CHACHA20_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+/**
+ * Length of the encryption key.
+ */
+#define occ_chacha20_KEY_BYTES (32)
+
+/**
+ * Maximum length of the nonce.
+ */
+#define occ_chacha20_NONCE_BYTES_MAX (12)
+
+
+/**
+ * ChaCha20 cipher stream generator.
+ * 
+ * The encryption key @p k, the nonce @p n and the initial block counter
+ * @p count are used to generate a pseudo random cipher stream.
+ *
+ * Possible applications include key generation and random number generation.
+ *
+ * **Example**
+ * @include occ_chacha20_stream.c
+ * 
+ * @param[out] c     Generated cipher stream.
+ * @param      c_len Length of @p c.
+ * @param      n     Nonce.
+ * @param      n_len Nonce length. 0 <= @p n_len <= @c occ_chacha20_NONCE_BYTES_MAX.
+ * @param      k     Encryption key.
+ * @param      count Initial block counter.
+ *
+ * @remark When reusing an encryption key @p k, a different nonce @p n or
+ *         initial block counter @p count must be used.
+ *
+ * @remark This function is equivalent to @c chacha20_stream_xor with a
+ *         message @p m consisting of @p c_len zeroes.
+ */
+void occ_chacha20_stream(uint8_t *c, size_t c_len,
+                         const uint8_t *n, size_t n_len,
+                         const uint8_t k[occ_chacha20_KEY_BYTES],
+                         uint32_t count);
+
+/**
+ * ChaCha20 cipher stream encoder.
+ *
+ * The message @p m is encrypted by applying the XOR operation with a pseudo
+ * random cipher stream derived from the encryption key @p k, the nonce @p n and
+ * the initial block counter @p count.
+ *
+ * Calling the function a second time with the generated ciphertext as input
+ * message @p m decrypts it back to the original message.
+ *
+ * **Example**
+ * @include occ_chacha20_stream_xor.c
+ *
+ * @param[out] c     Generated ciphertext. Same length as input message.
+ * @param      m     Input message.
+ * @param      m_len Length of @p c and @p m.
+ * @param      n     Nonce.
+ * @param      n_len Nonce length. 0 <= @p n_len <= @c occ_chacha20_NONCE_BYTES_MAX.
+ * @param      k     Encryption key.
+ * @param      count Initial block counter.
+ * 
+ * @remark @p c and @p m can point to the same address.
+ *
+ * @remark When reusing an encryption key @p k for a different message @p m, a
+ *         different nonce @p n or initial block counter @p count must be used.
+ */
+void occ_chacha20_stream_xor(uint8_t *c,
+                             const uint8_t *m, size_t m_len,
+                             const uint8_t *n, size_t n_len,
+                             const uint8_t k[occ_chacha20_KEY_BYTES],
+                             uint32_t count);
+
+#endif