feat(mbedtls): bring mbedtls and openssl based on mbedtls from esp-idf

Commit ID: 97959e77.

Using submodule instead of source code.

It is brought from esp-idf, and some origin dependent code or configuration of hardware have not been removed.
But it maybe not affect using at the ESP8266 platform.

components/openssl/library/ssl_cert.c

@@ -0,0 +1,87 @@
+// 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.
+
+#include "ssl_cert.h"
+#include "ssl_pkey.h"
+#include "ssl_x509.h"
+#include "ssl_dbg.h"
+#include "ssl_port.h"
+
+/**
+ * @brief create a certification object according to input certification
+ */
+CERT *__ssl_cert_new(CERT *ic)
+{
+    CERT *cert;
+
+    X509 *ix;
+    EVP_PKEY *ipk;
+
+    cert = ssl_mem_zalloc(sizeof(CERT));
+    if (!cert) {
+        SSL_DEBUG(SSL_CERT_ERROR_LEVEL, "no enough memory > (cert)");
+        goto no_mem;
+    }
+
+    if (ic) {
+        ipk = ic->pkey;
+        ix = ic->x509;
+    } else {
+        ipk = NULL;
+        ix = NULL;
+    }
+
+    cert->pkey = __EVP_PKEY_new(ipk);
+    if (!cert->pkey) {
+        SSL_DEBUG(SSL_CERT_ERROR_LEVEL, "__EVP_PKEY_new() return NULL");
+        goto pkey_err;
+    }
+
+    cert->x509 = __X509_new(ix);
+    if (!cert->x509) {
+        SSL_DEBUG(SSL_CERT_ERROR_LEVEL, "__X509_new() return NULL");
+        goto x509_err;
+    }
+
+    return cert;
+
+x509_err:
+    EVP_PKEY_free(cert->pkey);
+pkey_err:
+    ssl_mem_free(cert);
+no_mem:
+    return NULL;
+}
+
+/**
+ * @brief create a certification object include private key object
+ */
+CERT *ssl_cert_new(void)
+{
+    return __ssl_cert_new(NULL);
+}
+
+/**
+ * @brief free a certification object
+ */
+void ssl_cert_free(CERT *cert)
+{
+    SSL_ASSERT3(cert);
+
+    X509_free(cert->x509);
+
+    EVP_PKEY_free(cert->pkey);
+
+    ssl_mem_free(cert);
+}