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diff --git a/include/olm/session.hh b/include/olm/session.hh
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--- /dev/null
+++ b/include/olm/session.hh
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+/* Copyright 2015 OpenMarket 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.
+ */
+#ifndef OLM_SESSION_HH_
+#define OLM_SESSION_HH_
+
+#include "olm/ratchet.hh"
+
+namespace olm {
+
+class Account;
+
+struct RemoteKey {
+    std::uint32_t id;
+    Curve25519PublicKey key;
+};
+
+
+enum struct MessageType {
+    PRE_KEY = 0,
+    MESSAGE = 1,
+};
+
+
+struct Session {
+
+    Session();
+
+    Ratchet ratchet;
+    ErrorCode last_error;
+
+    bool received_message;
+
+    RemoteKey alice_identity_key;
+    Curve25519PublicKey alice_base_key;
+    std::uint32_t bob_one_time_key_id;
+
+
+    std::size_t new_outbound_session_random_length();
+
+    std::size_t new_outbound_session(
+        Account const & local_account,
+        Curve25519PublicKey const & identity_key,
+        RemoteKey const & one_time_key,
+        std::uint8_t const * random, std::size_t random_length
+    );
+
+    std::size_t new_inbound_session(
+        Account & local_account,
+        std::uint8_t const * one_time_key_message, std::size_t message_length
+    );
+
+    bool matches_inbound_session(
+        std::uint8_t const * one_time_key_message, std::size_t message_length
+    );
+
+    MessageType encrypt_message_type();
+
+    std::size_t encrypt_message_length(
+        std::size_t plaintext_length
+    );
+
+    std::size_t encrypt_random_length();
+
+    std::size_t encrypt(
+        std::uint8_t const * plaintext, std::size_t plaintext_length,
+        std::uint8_t const * random, std::size_t random_length,
+        std::uint8_t * message, std::size_t message_length
+    );
+
+    std::size_t decrypt_max_plaintext_length(
+        MessageType message_type,
+        std::uint8_t const * message, std::size_t message_length
+    );
+
+    std::size_t decrypt(
+        MessageType message_type,
+        std::uint8_t const * message, std::size_t message_length,
+        std::uint8_t * plaintext, std::size_t max_plaintext_length
+    );
+};
+
+
+std::size_t pickle_length(
+    Session const & value
+);
+
+
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    Session const & value
+);
+
+
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    Session & value
+);
+
+
+} // namespace olm
+
+#endif /* OLM_SESSION_HH_ */