初始版本

components/libraries/crypto/nrf_crypto_shared.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_config.h"
+#include "nordic_common.h"
+#include "nrf_crypto_shared.h"
+
+
+#if NRF_MODULE_ENABLED(NRF_CRYPTO)
+
+
+void nrf_crypto_internal_swap_endian_in_place(uint8_t * p_buffer, size_t size)
+{
+    ASSERT(p_buffer != NULL);
+
+    uint8_t temp;
+    uint8_t * p_first = p_buffer;
+    uint8_t * p_last = p_buffer + size - 1;
+    while (p_last >= p_first)
+    {
+        temp = *p_first;
+        *p_first = *p_last;
+        *p_last = temp;
+        p_first++;
+        p_last--;
+    }
+}
+
+
+void nrf_crypto_internal_swap_endian(uint8_t * p_out, uint8_t const * p_in, size_t size)
+{
+    ASSERT(p_out != NULL);
+    ASSERT(p_in != NULL);
+
+    uint8_t const * p_first = p_in;
+    uint8_t * p_last = p_out + size - 1;
+    while (p_last >= p_out)
+    {
+        *p_last = *p_first;
+        p_first++;
+        p_last--;
+    }
+}
+
+
+void nrf_crypto_internal_double_swap_endian(uint8_t * p_out, uint8_t const * p_in, size_t part_size)
+{
+    nrf_crypto_internal_swap_endian(p_out, p_in, part_size);
+    nrf_crypto_internal_swap_endian(&p_out[part_size], &p_in[part_size], part_size);
+}
+
+
+void nrf_crypto_internal_double_swap_endian_in_place(uint8_t * p_buffer, size_t part_size)
+{
+    nrf_crypto_internal_swap_endian_in_place(p_buffer, part_size);
+    nrf_crypto_internal_swap_endian_in_place(&p_buffer[part_size], part_size);
+}
+
+
+#endif