Imported more library files

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Libs/protocol/openthread/platform-abstraction/efr32/entropy.c

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+/*
+ *  Copyright (c) 2023, The OpenThread Authors.
+ *  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 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 the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
+ */
+
+/**
+ * @file
+ *   This file implements the OpenThread platform abstraction for random number generator.
+ *
+ */
+
+#include <openthread-core-config.h>
+#include <stddef.h>
+#include <openthread/platform/entropy.h>
+#include "utils/code_utils.h"
+
+#if OPENTHREAD_CONFIG_CRYPTO_LIB == OPENTHREAD_CONFIG_CRYPTO_LIB_PSA
+
+#include "security_manager.h"
+
+void otPlatCryptoRandomInit(void)
+{
+}
+
+void otPlatCryptoRandomDeinit(void)
+{
+    // Intentionally left blank, nothing to deinit
+}
+
+otError otPlatCryptoRandomGet(uint8_t *aBuffer, uint16_t aSize)
+{
+    otError      error = OT_ERROR_NONE;
+    psa_status_t status;
+
+    status = sl_sec_man_get_random(aBuffer, aSize);
+
+    otEXPECT_ACTION((status == PSA_SUCCESS), error = OT_ERROR_FAILED);
+
+exit:
+    return error;
+}
+#else
+// The mbedtls_hardware_poll() function is meant for internal use by Mbed TLS
+// and is not declared in any external header files. We will therefore declare
+// it as an extern function here.
+extern int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen);
+
+otError otPlatEntropyGet(uint8_t *aOutput, uint16_t aOutputLength)
+{
+    otError error     = OT_ERROR_NONE;
+    size_t  outputLen = 0;
+
+    otEXPECT_ACTION(aOutput, error = OT_ERROR_INVALID_ARGS);
+
+    for (size_t partialLen = 0; outputLen < aOutputLength; outputLen += partialLen)
+    {
+        const uint16_t remaining = aOutputLength - outputLen;
+        partialLen               = 0;
+
+        // Non-zero return values for mbedtls_hardware_poll() signify an error has occurred
+        otEXPECT_ACTION(0 == mbedtls_hardware_poll(NULL, &aOutput[outputLen], remaining, &partialLen),
+                        error = OT_ERROR_FAILED);
+    }
+
+exit:
+    return error;
+}
+#endif