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diff --git a/ncat/base64.c b/ncat/base64.c
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+/***************************************************************************
+ * base64.c -- Base64 encoding.                                            *
+ ***********************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/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "base64.h"
+#include "nbase.h"
+
+static int b64enc_internal(const unsigned char *data, int len, char *dest)
+{
+    /* base64 alphabet, taken from rfc3548 */
+    char *b64alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+    char *buf = dest;
+
+    /* Encode three bytes per iteration a la rfc3548. */
+    while (len >= 3) {
+        buf[0] = b64alpha[(data[0] >> 2) & 0x3f];
+        buf[1] = b64alpha[((data[0] << 4) & 0x30) | ((data[1] >> 4) & 0xf)];
+        buf[2] = b64alpha[((data[1] << 2) & 0x3c) | ((data[2] >> 6) & 0x3)];
+        buf[3] = b64alpha[data[2] & 0x3f];
+        data += 3;
+        buf += 4;
+        len -= 3;
+    }
+
+    /* Pad the remaining bytes. len is 0, 1, or 2 here. */
+    if (len > 0) {
+        buf[0] = b64alpha[(data[0] >> 2) & 0x3f];
+        if (len > 1) {
+            buf[1] = b64alpha[((data[0] << 4) & 0x30) | ((data[1] >> 4) & 0xf)];
+            buf[2] = b64alpha[(data[1] << 2) & 0x3c];
+        } else {
+            buf[1] = b64alpha[(data[0] << 4) & 0x30];
+            buf[2] = '=';
+        }
+        buf[3] = '=';
+        buf += 4;
+    }
+
+    /*
+     * As mentioned in rfc3548, we need to be careful about
+     * how we null terminate and handle embedded null-termination.
+     */
+    *buf = '\0';
+
+    return (buf - dest);
+}
+
+/* Take in plain text and encode into base64. */
+char *b64enc(const unsigned char *data, int len)
+{
+    char *dest;
+
+    /* malloc enough space to do something useful */
+    dest = (char *) safe_malloc(4 * len / 3 + 4);
+
+    dest[0] = '\0';
+
+    /* Call internal function to base64 encode data */
+    b64enc_internal(data, len, dest);
+
+    return (dest);
+}