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components/libraries/crypto/backend/optiga/optiga_backend_rng.c

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+/**
+ * Copyright (c) 2018 - 2020, 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.
+ *
+ */
+
+#include "sdk_common.h"
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO)
+#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
+#if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
+
+#include "nrf_crypto_rng.h"
+#include "optiga_backend_rng.h"
+#include "optiga/optiga_crypt.h"
+
+
+/** @brief Minimal size output of random data in OPTIGA Trust X
+ *
+ * @details See Solution Reference Manual v1.35, section 4.4.3.4
+ */
+#define OPTIGA_RNG_MIN_SIZE         (0x8)
+
+
+/** @brief Maximum size output of random data in OPTIGA Trust X
+ *
+ * @details See Solution Reference Manual v1.35, section 4.4.3.4
+ */
+#define OPTIGA_RNG_MAX_SIZE         (0x100)
+
+
+ret_code_t nrf_crypto_rng_backend_init(void * const p_context,
+                                       void * const p_temp_buffer)
+{
+    UNUSED_PARAMETER(p_context);
+    UNUSED_PARAMETER(p_temp_buffer);
+
+    return NRF_SUCCESS;
+}
+
+
+ret_code_t nrf_crypto_rng_backend_uninit(void * const p_context)
+{
+    UNUSED_PARAMETER(p_context);
+
+    return NRF_SUCCESS;
+}
+
+
+ret_code_t nrf_crypto_rng_backend_vector_generate(void      * const p_context,
+                                                  uint8_t   * const p_target,
+                                                  size_t            size,
+                                                  bool              use_mutex)
+{
+    UNUSED_PARAMETER(use_mutex);
+    UNUSED_PARAMETER(p_context);
+
+    uint8_t backup[OPTIGA_RNG_MIN_SIZE] = {0};
+    optiga_lib_status_t err;
+
+    uint8_t * out_cur = p_target;
+
+    size_t size_left = size;
+    size_t cur_len = size_left;
+
+    do
+    {
+        cur_len = size_left > OPTIGA_RNG_MAX_SIZE ? OPTIGA_RNG_MAX_SIZE : size_left;
+
+        if (cur_len < OPTIGA_RNG_MIN_SIZE)
+        {
+            err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, backup, OPTIGA_RNG_MIN_SIZE);
+            if(err != OPTIGA_LIB_SUCCESS)
+            {
+                return NRF_ERROR_CRYPTO_INTERNAL;
+            }
+
+            memcpy(out_cur, backup, cur_len);
+        }
+        else
+        {
+            err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, out_cur, cur_len);
+            if (err != OPTIGA_LIB_SUCCESS)
+            {
+                return NRF_ERROR_CRYPTO_INTERNAL;
+            }
+        }
+
+        out_cur += cur_len;
+        size_left -= cur_len;
+
+    } while(size_left > 0);
+
+    return NRF_SUCCESS;
+}
+
+
+ret_code_t nrf_crypto_rng_backend_reseed(void   * const p_context,
+                                         void         * p_temp_buffer,
+                                         uint8_t      * p_input_data,
+                                         size_t         size)
+{
+    UNUSED_PARAMETER(p_context);
+    UNUSED_PARAMETER(p_temp_buffer);
+    UNUSED_PARAMETER(p_input_data);
+    UNUSED_PARAMETER(size);
+
+    return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
+}
+
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
+#endif // NRF_MODULE_ENABLED(NRF_CRYPTO)