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diff --git a/src/crypto_context.h b/src/crypto_context.h
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+++ b/src/crypto_context.h
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+/*
+    Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    libdcp 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+#ifndef LIBDCP_CRYPTO_CONTEXT_H
+#define LIBDCP_CRYPTO_CONTEXT_H
+
+#include "key.h"
+#include "types.h"
+#include "exceptions.h"
+#include <asdcp/AS_DCP.h>
+#include <asdcp/KM_prng.h>
+#include <boost/optional.hpp>
+
+namespace dcp {
+
+template <class T>
+class CryptoContext
+{
+public:
+       CryptoContext (boost::optional<Key> key, Standard standard)
+               : _context (0)
+               , _hmac (0)
+       {
+               if (!key) {
+                       return;
+               }
+
+               _context = new T;
+               if (ASDCP_FAILURE (_context->InitKey (key->value ()))) {
+                       throw MiscError ("could not set up crypto context");
+               }
+
+               uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
+
+               Kumu::FortunaRNG rng;
+               if (ASDCP_FAILURE (_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
+                       throw MiscError ("could not set up CBC initialization vector");
+               }
+
+               _hmac = new ASDCP::HMACContext;
+
+               ASDCP::LabelSet_t type;
+               if (standard == INTEROP) {
+                       type = ASDCP::LS_MXF_INTEROP;
+               } else {
+                       type = ASDCP::LS_MXF_SMPTE;
+               }
+
+               if (ASDCP_FAILURE (_hmac->InitKey (key->value(), type))) {
+                       throw MiscError ("could not set up HMAC context");
+               }
+       }
+
+       ~CryptoContext ()
+       {
+               delete _context;
+               delete _hmac;
+       }
+
+       T* context () const {
+               return _context;
+       }
+
+       ASDCP::HMACContext* hmac () const {
+               return _hmac;
+       }
+
+private:
+       T* _context;
+       ASDCP::HMACContext* _hmac;
+};
+
+typedef CryptoContext<ASDCP::AESEncContext> EncryptionContext;
+typedef CryptoContext<ASDCP::AESDecContext> DecryptionContext;
+
+}
+
+#endif