feat(ssl): Restructure ssl folder

Put mbedtls, axtls, openssl to ssl, also add kconfig to choose ssl library.
Default use mbedtls.

components/ssl/openssl/include/internal/ssl_methods.h

@@ -0,0 +1,121 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _SSL_METHODS_H_
+#define _SSL_METHODS_H_
+
+#include "ssl_types.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/**
+ * TLS method function implement
+ */
+#define IMPLEMENT_TLS_METHOD_FUNC(func_name, \
+                    new, free, \
+                    handshake, shutdown, clear, \
+                    read, send, pending, \
+                    set_fd, get_fd, \
+                    set_bufflen, \
+                    get_verify_result, \
+                    get_state) \
+        static const SSL_METHOD_FUNC func_name LOCAL_ATRR = { \
+                new, \
+                free, \
+                handshake, \
+                shutdown, \
+                clear, \
+                read, \
+                send, \
+                pending, \
+                set_fd, \
+                get_fd, \
+                set_bufflen, \
+                get_verify_result, \
+                get_state \
+        };
+
+#define IMPLEMENT_TLS_METHOD(ver, mode, fun, func_name) \
+    const SSL_METHOD* func_name(void) { \
+        static const SSL_METHOD func_name##_data LOCAL_ATRR = { \
+                ver, \
+                mode, \
+                &(fun), \
+        }; \
+        return &func_name##_data; \
+    }
+
+#define IMPLEMENT_SSL_METHOD(ver, mode, fun, func_name) \
+    const SSL_METHOD* func_name(void) { \
+        static const SSL_METHOD func_name##_data LOCAL_ATRR = { \
+                ver, \
+                mode, \
+                &(fun), \
+        }; \
+        return &func_name##_data; \
+    }
+
+#define IMPLEMENT_X509_METHOD(func_name, \
+                new, \
+                free, \
+                load, \
+                show_info) \
+    const X509_METHOD* func_name(void) { \
+        static const X509_METHOD func_name##_data LOCAL_ATRR = { \
+                new, \
+                free, \
+                load, \
+                show_info \
+        }; \
+        return &func_name##_data; \
+    }
+
+#define IMPLEMENT_PKEY_METHOD(func_name, \
+                new, \
+                free, \
+                load) \
+    const PKEY_METHOD* func_name(void) { \
+        static const PKEY_METHOD func_name##_data LOCAL_ATRR = { \
+                new, \
+                free, \
+                load \
+        }; \
+        return &func_name##_data; \
+    }
+
+/**
+ * @brief get X509 object method
+ *
+ * @param none
+ *
+ * @return X509 object method point
+ */
+const X509_METHOD* X509_method(void);
+
+/**
+ * @brief get private key object method
+ *
+ * @param none
+ *
+ * @return private key object method point
+ */
+const PKEY_METHOD* EVP_PKEY_method(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif