base64.h

/* base64.h
   
   Base-64 encoding and decoding.

   Copyright (C) 2002 Niels Möller, Dan Egnor

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.

   GNU Nettle 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.  See the GNU
   General Public License for more details.

   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/
 
#ifndef NETTLE_BASE64_H_INCLUDED
#define NETTLE_BASE64_H_INCLUDED

#include "nettle-types.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Name mangling */
#define base64_encode_init nettle_base64_encode_init
#define base64url_encode_init nettle_base64url_encode_init
#define base64_encode_single nettle_base64_encode_single
#define base64_encode_update nettle_base64_encode_update
#define base64_encode_final nettle_base64_encode_final
#define base64_encode_raw nettle_base64_encode_raw
#define base64_encode_group nettle_base64_encode_group
#define base64_decode_init nettle_base64_decode_init
#define base64url_decode_init nettle_base64url_decode_init
#define base64_decode_single nettle_base64_decode_single
#define base64_decode_update nettle_base64_decode_update
#define base64_decode_final nettle_base64_decode_final

#define BASE64_BINARY_BLOCK_SIZE 3
#define BASE64_TEXT_BLOCK_SIZE 4

/* Base64 encoding */

/* Maximum length of output for base64_encode_update. NOTE: Doesn't
 * include any padding that base64_encode_final may add. */
/* We have at most 4 buffered bits, and a total of (4 + length * 8) bits. */
#define BASE64_ENCODE_LENGTH(length) (((length) * 8 + 4)/6)

/* Maximum length of output generated by base64_encode_final. */
#define BASE64_ENCODE_FINAL_LENGTH 3

/* Exact length of output generated by base64_encode_raw, including