Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/crypto/cryptodcsel.hpp

@@ -0,0 +1,72 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program 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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Select appropriate OpenVPN protocol data channel implementation
+
+#ifndef OPENVPN_CRYPTO_CRYPTODCSEL_H
+#define OPENVPN_CRYPTO_CRYPTODCSEL_H
+
+#include <openvpn/common/exception.hpp>
+#include <openvpn/crypto/cryptodc.hpp>
+#include <openvpn/crypto/crypto_chm.hpp>
+#include <openvpn/crypto/crypto_aead.hpp>
+#include <openvpn/random/randapi.hpp>
+
+namespace openvpn {
+
+  OPENVPN_EXCEPTION(crypto_dc_select);
+
+  template <typename CRYPTO_API>
+  class CryptoDCSelect : public CryptoDCFactory
+  {
+  public:
+    typedef RCPtr<CryptoDCSelect> Ptr;
+
+    CryptoDCSelect(const Frame::Ptr& frame_arg,
+		   const SessionStats::Ptr& stats_arg,
+		   const RandomAPI::Ptr& prng_arg)
+      : frame(frame_arg),
+	stats(stats_arg),
+	prng(prng_arg)
+    {
+    }
+
+    virtual CryptoDCContext::Ptr new_obj(const CryptoAlgs::Type cipher,
+					 const CryptoAlgs::Type digest)
+    {
+      const CryptoAlgs::Alg& alg = CryptoAlgs::get(cipher);
+      if (alg.flags() & CryptoAlgs::CBC_HMAC)
+	return new CryptoContextCHM<CRYPTO_API>(cipher, digest, frame, stats, prng);
+      else if (alg.flags() & CryptoAlgs::AEAD)
+	return new AEAD::CryptoContext<CRYPTO_API>(cipher, frame, stats);
+      else
+	OPENVPN_THROW(crypto_dc_select, alg.name() << ": only CBC/HMAC and AEAD cipher modes supported");
+    }
+
+  private:
+    Frame::Ptr frame;
+    SessionStats::Ptr stats;
+    RandomAPI::Ptr prng;
+  };
+
+}
+
+#endif