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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);
}
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