diff --git a/ext/nrf/README.md b/ext/nrf/README.md
new file mode 100644
index 0000000..a22f06a
--- /dev/null
+++ b/ext/nrf/README.md
@@ -0,0 +1,18 @@
+# Building MCUBoot with nRF52840 CC310 enabled
+
+## Pre-prerequisites
+
+Clone [nrfxlib](https://github.com/NordicPlayground/nrfxlib) next to the mcuboot root folder. So that it's located `../nrfxlib` from mcuboots root folder.
+
+## Building
+
+make sure `root-ec-p256.pem` is set as the certificate and that `CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256` is selected not `CONFIG_BOOT_SIGNATURE_TYPE_RSA` in `prj.conf` of `boot/zephyr`.
+Since it defaults to tinycrypt you'll have to go into `menuconfig` and change the implementation selection to `cc310` or also set this in `prj.conf`.
+
+```
+mkdir build && cd build
+cmake -GNinja -DBOARD=nrf52840_pca10056
+ninja flash
+```
+
+Build a hello world example in zephyr and sign it with imgtool.py with the `root-ec-p256.pem` and flash it at `FLASH_AREA_IMAGE_0`.
diff --git a/ext/nrf/cc310_glue.c b/ext/nrf/cc310_glue.c
new file mode 100644
index 0000000..14b9ac6
--- /dev/null
+++ b/ext/nrf/cc310_glue.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2019 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
+ */
+
+#include "cc310_glue.h"
+
+int cc310_init(void)
+{
+    /* Only initialize once */
+    static bool initialized;
+
+    if (!initialized) {
+        nrf_cc310_enable();
+        if (nrf_cc310_bl_init() != 0) {
+            return -1;
+        }
+        initialized = true;
+        nrf_cc310_disable();
+    }
+
+    return 0;
+}
+
+void cc310_sha256_update(nrf_cc310_bl_hash_context_sha256_t *ctx,
+                         const void *data,
+                         uint32_t data_len)
+{
+    /*
+     * NRF Cryptocell can only read from RAM this allocates a buffer on the stack
+     * if the data provided is not located in RAM.
+     */
+
+    if ((uint32_t) data < CONFIG_SRAM_BASE_ADDRESS) {
+        uint8_t stack_buffer[data_len];
+        uint32_t block_len = data_len;
+        memcpy(stack_buffer, data, block_len);
+        nrf_cc310_bl_hash_sha256_update(ctx, stack_buffer, block_len);
+    } else {
+        nrf_cc310_bl_hash_sha256_update(ctx, data, data_len);
+    }
+};
+
+int cc310_ecdsa_verify_secp256r1(uint8_t *hash,
+                                 uint8_t *public_key,
+                                 uint8_t *signature,
+                                 size_t hash_len)
+{
+        int rc;
+        nrf_cc310_bl_ecdsa_verify_context_secp256r1_t ctx;
+        cc310_init();
+        nrf_cc310_enable();
+        rc = nrf_cc310_bl_ecdsa_verify_secp256r1(&ctx,
+                                                 (nrf_cc310_bl_ecc_public_key_secp256r1_t *) public_key,
+                                                 (nrf_cc310_bl_ecc_signature_secp256r1_t  *) signature,
+                                                 hash,
+                                                 hash_len);
+        nrf_cc310_disable();
+        return rc;
+}
+
diff --git a/ext/nrf/cc310_glue.h b/ext/nrf/cc310_glue.h
new file mode 100644
index 0000000..db34c34
--- /dev/null
+++ b/ext/nrf/cc310_glue.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2019 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
+ */
+#ifndef NRF_CC310_GLUE_H__
+#define NRF_CC310_GLUE_H__
+
+#include <nrf.h>
+#include <nrf_cc310_bl_init.h>
+#include <nrf_cc310_bl_hash_sha256.h>
+#include <nrf_cc310_bl_ecdsa_verify_secp256r1.h>
+#include <generated_dts_board.h>
+#include <string.h>
+
+typedef nrf_cc310_bl_hash_context_sha256_t bootutil_sha256_context;
+
+int cc310_ecdsa_verify_secp256r1(uint8_t *hash,
+                                 uint8_t *public_key,
+                                 uint8_t *signature,
+                                 size_t hash_len);
+
+
+int cc310_init(void);
+
+static inline void cc310_sha256_init(nrf_cc310_bl_hash_context_sha256_t *ctx);
+
+void cc310_sha256_update(nrf_cc310_bl_hash_context_sha256_t *ctx,
+                         const void *data,
+                         uint32_t data_len);
+
+static inline void nrf_cc310_enable(void)
+{
+    NRF_CRYPTOCELL->ENABLE=1;
+}
+
+static inline void nrf_cc310_disable(void)
+{
+    NRF_CRYPTOCELL->ENABLE=1;
+}
+
+/* Enable and disable cc310 to reduce power consumption */
+static inline void cc310_sha256_init(nrf_cc310_bl_hash_context_sha256_t * ctx)
+{
+    cc310_init();
+    nrf_cc310_enable();
+    nrf_cc310_bl_hash_sha256_init(ctx);
+}
+
+static inline void cc310_sha256_finalize(bootutil_sha256_context *ctx,
+                                          uint8_t *output)
+{
+    nrf_cc310_bl_hash_sha256_finalize(ctx,
+                                      (nrf_cc310_bl_hash_digest_sha256_t *)output);
+    nrf_cc310_disable();
+}
+
+#endif /* NRF_CC310_GLUE_H__ */