API encryption (#2254)

esphome/core/defines.h

@@ -54,5 +54,8 @@
 #define USE_SOCKET_IMPL_BSD_SOCKETS
 #endif
 
+#define USE_API_PLAINTEXT
+#define USE_API_NOISE
+
 // Disabled feature flags
 //#define USE_BSEC  // Requires a library with proprietary license.

esphome/core/helpers.cpp

@@ -55,6 +55,15 @@ double random_double() { return random_uint32() / double(UINT32_MAX); }
 
 float random_float() { return float(random_double()); }
 
+void fill_random(uint8_t *data, size_t len) {
+#ifdef ARDUINO_ARCH_ESP32
+  esp_fill_random(data, len);
+#else
+  int err = os_get_random(data, len);
+  assert(err == 0);
+#endif
+}
+
 static uint32_t fast_random_seed = 0;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
 
 void fast_random_set_seed(uint32_t seed) { fast_random_seed = seed; }

esphome/core/helpers.h

@@ -109,6 +109,8 @@ double random_double();
 /// Returns a random float between 0 and 1. Essentially just casts random_double() to a float.
 float random_float();
 
+void fill_random(uint8_t *data, size_t len);
+
 void fast_random_set_seed(uint32_t seed);
 uint32_t fast_random_32();
 uint16_t fast_random_16();