Externals: Add libcurl.

Externals/curl/lib/vtls/polarssl.h

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+#ifndef HEADER_CURL_POLARSSL_H
+#define HEADER_CURL_POLARSSL_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2012 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2010, Hoi-Ho Chan, <hoiho.chan@gmail.com>
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+#ifdef USE_POLARSSL
+
+#include <polarssl/sha256.h>
+
+/* Called on first use PolarSSL, setup threading if supported */
+int  Curl_polarssl_init(void);
+void Curl_polarssl_cleanup(void);
+
+
+CURLcode Curl_polarssl_connect(struct connectdata *conn, int sockindex);
+
+CURLcode Curl_polarssl_connect_nonblocking(struct connectdata *conn,
+                                           int sockindex,
+                                           bool *done);
+
+ /* close a SSL connection */
+void Curl_polarssl_close(struct connectdata *conn, int sockindex);
+
+void Curl_polarssl_session_free(void *ptr);
+size_t Curl_polarssl_version(char *buffer, size_t size);
+int Curl_polarssl_shutdown(struct connectdata *conn, int sockindex);
+
+/* Set the API backend definition to PolarSSL */
+#define CURL_SSL_BACKEND CURLSSLBACKEND_POLARSSL
+
+/* this backend supports the CAPATH option */
+#define have_curlssl_ca_path 1
+
+/* this backends supports CURLOPT_PINNEDPUBLICKEY */
+#define have_curlssl_pinnedpubkey 1
+
+/* API setup for PolarSSL */
+#define curlssl_init() Curl_polarssl_init()
+#define curlssl_cleanup() Curl_polarssl_cleanup()
+#define curlssl_connect Curl_polarssl_connect
+#define curlssl_connect_nonblocking Curl_polarssl_connect_nonblocking
+#define curlssl_session_free(x)  Curl_polarssl_session_free(x)
+#define curlssl_close_all(x) ((void)x)
+#define curlssl_close Curl_polarssl_close
+#define curlssl_shutdown(x,y) 0
+#define curlssl_set_engine(x,y) ((void)x, (void)y, CURLE_NOT_BUILT_IN)
+#define curlssl_set_engine_default(x) ((void)x, CURLE_NOT_BUILT_IN)
+#define curlssl_engines_list(x) ((void)x, (struct curl_slist *)NULL)
+#define curlssl_version Curl_polarssl_version
+#define curlssl_check_cxn(x) ((void)x, -1)
+#define curlssl_data_pending(x,y) ((void)x, (void)y, 0)
+#define curlssl_sha256sum(a,b,c,d) sha256(a,b,c,0)
+
+/* This might cause libcurl to use a weeker random!
+   TODO: implement proper use of Polarssl's CTR-DRBG or HMAC-DRBG and use that
+*/
+#define curlssl_random(x,y,z) ((void)x, (void)y, (void)z, CURLE_NOT_BUILT_IN)
+
+#endif /* USE_POLARSSL */
+#endif /* HEADER_CURL_POLARSSL_H */