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diff --git a/ncat/ncat_ssl.h b/ncat/ncat_ssl.h
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+/***************************************************************************
+ * ncat_ssl.h                                                              *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+ * Project"). Nmap is also a registered trademark of the Nmap Project.
+ *
+ * This program is distributed under the terms of the Nmap Public Source
+ * License (NPSL). The exact license text applying to a particular Nmap
+ * release or source code control revision is contained in the LICENSE
+ * file distributed with that version of Nmap or source code control
+ * revision. More Nmap copyright/legal information is available from
+ * https://nmap.org/book/man-legal.html, and further information on the
+ * NPSL license itself can be found at https://nmap.org/npsl/ . This
+ * header summarizes some key points from the Nmap license, but is no
+ * substitute for the actual license text.
+ *
+ * Nmap is generally free for end users to download and use themselves,
+ * including commercial use. It is available from https://nmap.org.
+ *
+ * The Nmap license generally prohibits companies from using and
+ * redistributing Nmap in commercial products, but we sell a special Nmap
+ * OEM Edition with a more permissive license and special features for
+ * this purpose. See https://nmap.org/oem/
+ *
+ * If you have received a written Nmap license agreement or contract
+ * stating terms other than these (such as an Nmap OEM license), you may
+ * choose to use and redistribute Nmap under those terms instead.
+ *
+ * The official Nmap Windows builds include the Npcap software
+ * (https://npcap.com) for packet capture and transmission. It is under
+ * separate license terms which forbid redistribution without special
+ * permission. So the official Nmap Windows builds may not be redistributed
+ * without special permission (such as an Nmap OEM license).
+ *
+ * Source is provided to this software because we believe users have a
+ * right to know exactly what a program is going to do before they run it.
+ * This also allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to submit your changes as a Github PR
+ * or by email to the dev@nmap.org mailing list for possible incorporation into
+ * the main distribution. Unless you specify otherwise, it is understood that
+ * you are offering us very broad rights to use your submissions as described in
+ * the Nmap Public Source License Contributor Agreement. This is important
+ * because we fund the project by selling licenses with various terms, and also
+ * because the inability to relicense code has caused devastating problems for
+ * other Free Software projects (such as KDE and NASM).
+ *
+ * The free version of Nmap 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. Warranties,
+ * indemnification and commercial support are all available through the
+ * Npcap OEM program--see https://nmap.org/oem/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+#ifndef NCAT_SSL_H
+#define NCAT_SSL_H
+
+#include "ncat_config.h"
+
+#ifdef HAVE_OPENSSL
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+
+#define NCAT_CA_CERTS_FILE "ca-bundle.crt"
+
+enum {
+    SHA1_BYTES = 160 / 8,
+    /* 40 bytes for hex digits and 9 bytes for ' '. */
+    SHA1_STRING_LENGTH = SHA1_BYTES * 2 + (SHA1_BYTES / 2 - 1)
+};
+
+/* These status variables are returned by ssl_handshake() to describe the
+ * status of a pending non-blocking ssl handshake(SSL_accept()). */
+enum {
+    NCAT_SSL_HANDSHAKE_COMPLETED      = 0,
+    NCAT_SSL_HANDSHAKE_PENDING_READ   = 1,
+    NCAT_SSL_HANDSHAKE_PENDING_WRITE  = 2,
+    NCAT_SSL_HANDSHAKE_FAILED         = 3
+};
+
+extern SSL_CTX *setup_ssl_listen(const SSL_METHOD *method);
+
+extern SSL *new_ssl(int fd);
+
+extern int ssl_post_connect_check(SSL *ssl, const char *hostname);
+
+extern char *ssl_cert_fp_str_sha1(const X509 *cert, char *strbuf, size_t len);
+
+extern int ssl_load_default_ca_certs(SSL_CTX *ctx);
+
+/* Try to complete an ssl handshake in a non-blocking way for the socket given
+ * in sinfo. Initialize the socket too with new_ssl() if it hasn't been done
+ * already. */
+extern int ssl_handshake(struct fdinfo *sinfo);
+
+#endif
+#endif