feat(mbedtls): Add mbedtls_esp_random()

Suitable for passing as f_rng to various Mbed-TLS APIs that require it

components/mbedtls/port/esp_hardware.c

@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include "esp_random.h"
+#include "mbedtls/esp_random.h"
 
 #include <entropy_poll.h>
 
@@ -23,3 +24,9 @@ int mbedtls_hardware_poll( void *data,
     *olen = len;
     return 0;
 }
+
+int mbedtls_esp_random(void *ctx, unsigned char *buf, size_t len)
+{
+    esp_fill_random(buf, len);
+    return 0;
+}

components/mbedtls/port/include/mbedtls/esp_random.h

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief MbedTLS-compatible RNG function
+ *
+ * @note Suitable for passing as f_rng to various Mbed-TLS APIs that require it.
+ *
+ * @param ctx User-supplied context
+ * @param buf Pointer to buffer to fill with random numbers.
+ * @param len Length of buffer in bytes
+ *
+ * @return 0 (success)
+ */
+int mbedtls_esp_random(void *ctx, unsigned char *buf, size_t len);
+
+#ifdef __cplusplus
+}
+#endif