Merge commit 'e988fee1679536137b87d10e939eff5c1f27c8ab' as 'libs/libzmq'

libs/libzmq/src/curve_mechanism_base.hpp

@@ -0,0 +1,108 @@
+/*
+    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_CURVE_MECHANISM_BASE_HPP_INCLUDED__
+#define __ZMQ_CURVE_MECHANISM_BASE_HPP_INCLUDED__
+
+#ifdef ZMQ_HAVE_CURVE
+
+#if defined(ZMQ_USE_TWEETNACL)
+#include "tweetnacl.h"
+#elif defined(ZMQ_USE_LIBSODIUM)
+#include "sodium.h"
+#endif
+
+#if crypto_box_NONCEBYTES != 24 || crypto_box_PUBLICKEYBYTES != 32             \
+  || crypto_box_SECRETKEYBYTES != 32 || crypto_box_ZEROBYTES != 32             \
+  || crypto_box_BOXZEROBYTES != 16 || crypto_secretbox_NONCEBYTES != 24        \
+  || crypto_secretbox_ZEROBYTES != 32 || crypto_secretbox_BOXZEROBYTES != 16
+#error "CURVE library not built properly"
+#endif
+
+#include "mechanism_base.hpp"
+#include "options.hpp"
+
+#include <memory>
+
+namespace zmq
+{
+class curve_encoding_t
+{
+  public:
+    curve_encoding_t (const char *encode_nonce_prefix_,
+                      const char *decode_nonce_prefix_,
+                      const bool downgrade_sub_);
+
+    int encode (msg_t *msg_);
+    int decode (msg_t *msg_, int *error_event_code_);
+
+    uint8_t *get_writable_precom_buffer () { return _cn_precom; }
+    const uint8_t *get_precom_buffer () const { return _cn_precom; }
+
+    typedef uint64_t nonce_t;
+
+    nonce_t get_and_inc_nonce () { return _cn_nonce++; }
+    void set_peer_nonce (nonce_t peer_nonce_) { _cn_peer_nonce = peer_nonce_; };
+
+  private:
+    int check_validity (msg_t *msg_, int *error_event_code_);
+
+    const char *_encode_nonce_prefix;
+    const char *_decode_nonce_prefix;
+
+    nonce_t _cn_nonce;
+    nonce_t _cn_peer_nonce;
+
+    //  Intermediary buffer used to speed up boxing and unboxing.
+    uint8_t _cn_precom[crypto_box_BEFORENMBYTES];
+
+    const bool _downgrade_sub;
+
+    ZMQ_NON_COPYABLE_NOR_MOVABLE (curve_encoding_t)
+};
+
+class curve_mechanism_base_t : public virtual mechanism_base_t,
+                               public curve_encoding_t
+{
+  public:
+    curve_mechanism_base_t (session_base_t *session_,
+                            const options_t &options_,
+                            const char *encode_nonce_prefix_,
+                            const char *decode_nonce_prefix_,
+                            const bool downgrade_sub_);
+
+    // mechanism implementation
+    int encode (msg_t *msg_) ZMQ_OVERRIDE;
+    int decode (msg_t *msg_) ZMQ_OVERRIDE;
+};
+}
+
+#endif
+
+#endif