feat(wolfssl): Add wolfssl library (Licensed from wolfSSL to Espressif)

From the license agreement, only release the library of wolfSSL.
wolfSSL version: v3.12.2

include/wolfssl/user_settings.h

@@ -0,0 +1,70 @@
+/*
+ * ESPRESSIF MIT License
+ *
+ * Copyright (c) 2017 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+ *
+ * Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
+ * it is free of charge, to any person obtaining a copy of this software and associated
+ * documentation files (the "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __USER_SETTINGS_H__
+#define __USER_SETTINGS_H__
+
+#define WOLFSSL_LWIP
+#define NO_WRITEV
+#define NO_WOLFSSL_DIR
+#define NO_INLINE
+#define NO_WOLFSSL_MEMORY
+#define HAVE_PK_CALLBACKS
+#define WOLFSSL_KEY_GEN
+#define WOLFSSL_RIPEMD
+#define ESP_PLATFORM
+#define DEBUG_ESP_PLATFORM
+#define USE_WOLFSSL_IO
+#define WOLFSSL_STATIC_RSA
+#define NO_DH
+#define NO_MD4
+#define NO_MD5
+#define NO_DES3
+#define NO_DSA
+#define NO_OLD_TLS
+#define HAVE_ECC
+#define WC_NO_HARDEN
+#define FREERTOS
+#define WOLFSSL_TYPES
+#define NO_FILESYSTEM
+
+#ifdef WOLFSSL_TYPES
+    #ifndef byte
+        typedef unsigned char  byte;
+    #endif
+    typedef unsigned short word16;
+    typedef unsigned int   word32;
+    typedef byte           word24[3];
+#endif
+
+#ifndef CUSTOM_RAND_GENERATE_BLOCK
+
+    /* To use define the following:*/
+    #define CUSTOM_RAND_GENERATE_BLOCK myRngFunc
+    extern int myRngFunc(byte* output, word32 sz);
+
+#endif
+
+#endif
+