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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/crypto/backend/oberon/oberon_backend_ecdh.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/crypto/backend/oberon/oberon_backend_ecdh.h
new file mode 100644
index 0000000..85dd0d0
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/crypto/backend/oberon/oberon_backend_ecdh.h
@@ -0,0 +1,108 @@
+/**
+ * Copyright (c) 2018 - 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 OBERON_BACKEND_ECDH_H__
+#define OBERON_BACKEND_ECDH_H__
+
+#include "sdk_config.h"
+#include "nordic_common.h"
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON)
+
+#include <stdint.h>
+#include "nrf_crypto_ecc.h"
+#include "nrf_crypto_ecdh_shared.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
+
+
+/** @internal See @ref nrf_crypto_backend_ecdh_compute_fn_t.
+ */
+ret_code_t nrf_crypto_backend_secp256r1_ecdh_compute(
+    void       * p_context,
+    void const * p_private_key,
+    void const * p_public_key,
+    uint8_t    * p_shared_secret);
+
+// Context in not used in OBERON backend
+typedef uint32_t nrf_crypto_backend_secp256r1_ecdh_context_t;
+#define NRF_CRYPTO_BACKEND_SECP256R1_ECDH_CONTEXT_SIZE 0
+
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
+
+/** @internal See @ref nrf_crypto_backend_ecdh_compute_fn_t.
+ */
+ret_code_t nrf_crypto_backend_curve25519_ecdh_compute(
+    void       * p_context,
+    void const * p_private_key,
+    void const * p_public_key,
+    uint8_t    * p_shared_secret);
+
+// Context in not used in OBERON backend
+typedef uint32_t nrf_crypto_backend_curve25519_ecdh_context_t;
+#define NRF_CRYPTO_BACKEND_CURVE25519_ECDH_CONTEXT_SIZE 0
+
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
+
+// ECDH is not possible for Ed25519
+#define nrf_crypto_backend_ed25519_ecdh_compute NULL
+typedef uint32_t nrf_crypto_backend_ed25519_ecdh_context_t;
+#define NRF_CRYPTO_BACKEND_ED25519_ECDH_CONTEXT_SIZE 0
+
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON)
+
+#endif // OBERON_BACKEND_ECDH_H__