pure sdk for main

sdk/lib/crypto/mbedtls/library/entropy_hwpoll.c

@@ -0,0 +1,29 @@
+
+#include "mbedtls/entropy.h"
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+
+int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen)
+{
+    int i;
+    int r;
+    char *ptr;
+
+    ((void)data);
+    if (NULL == output){
+        return -1;
+    }
+
+    ptr = (char *)output;
+    srand(time(NULL));
+
+    for (i = 0; i < len; i += sizeof(int))
+    {
+        r = rand();
+        (void) memcpy(ptr + i, &r, sizeof(int) > (unsigned int)(len - i)? (unsigned int)(len - i): sizeof(int));
+    }
+
+    *olen = len;
+    return 0;
+}