diff --git a/src/WebSockets.cpp b/src/WebSockets.cpp
index 118ebb7..a713625 100644
--- a/src/WebSockets.cpp
+++ b/src/WebSockets.cpp
@@ -38,6 +38,8 @@ extern "C" {
 
 #ifdef ESP8266
 #include <Hash.h>
+#elif defined(ESP32)
+#include <hwcrypto/sha.h>
 #else
 
 extern "C" {
@@ -483,6 +485,9 @@ String WebSockets::acceptKey(String & clientKey) {
     uint8_t sha1HashBin[20] = { 0 };
 #ifdef ESP8266
     sha1(clientKey + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", &sha1HashBin[0]);
+#elif defined(ESP32)
+    String data = clientKey + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+    esp_sha(SHA1, (unsigned char*)data.c_str(), data.length(), &sha1HashBin[0]);
 #else
     clientKey += "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
     SHA1_CTX ctx;