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diff --git a/lib/include/session.h b/lib/include/session.h
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+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBOSTP_SESSION_H_
+#define LIBOSTP_SESSION_H_
+
+#include <stdint.h>
+
+struct ostp_session {
+    unsigned char *session_key;
+    int sockfd;
+};
+
+/*
+ * Create a new ostp ostp_session.
+ *
+ * @host: IPv4 address of OST host.
+ * @res: Output for new ostp_session structure.
+ */
+int session_new(const char *host, struct ostp_session *res);
+
+/*
+ * Close an existing/running ostp_session.
+ *
+ * @ostp_session: Session to close.
+ */
+int session_close(struct ostp_session *session);
+
+/*
+ * Encrypt and send data to server.
+ *
+ * @data: Data to send.
+ * @len: Length of data.
+ * @ostp_session: Running ostp_session.
+ */
+int session_send(void *data, uint16_t len, const struct ostp_session *session);
+
+/*
+ * Receive data from the server.
+ *
+ * @buf: Buffer for received data.
+ * @len: Length of buffer.
+ * @ostp_session: Running ostp_session.
+ */
+int session_recv(void *buf, uint16_t len, const struct ostp_session *session);
+
+#endif      /* LIBOSTP_SESSION_H_ */