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/* base16.h
*
* Hex encoding and decoding, following spki conventions (i.e.
* allowing whitespace between digits).
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#ifndef NETTLE_BASE16_H_INCLUDED
#define NETTLE_BASE16_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define base16_encode_single nettle_base16_encode_single
#define base16_encode_update nettle_base16_encode_update
#define base16_decode_init nettle_base16_decode_init
#define base16_decode_single nettle_base16_decode_single
#define base16_decode_update nettle_base16_decode_update
#define base16_decode_final nettle_base16_decode_final
/* Base16 encoding */
/* Maximum length of output for base16_encode_update. */
#define BASE16_ENCODE_LENGTH(length) ((length) * 2)
/* Encodes a single byte. Always stores two digits in dst[0] and dst[1]. */
void
base16_encode_single(uint8_t *dst,
uint8_t src);
/* Always stores BASE16_ENCODE_LENGTH(length) digits in dst. */
void
base16_encode_update(uint8_t *dst,
unsigned length,
const uint8_t *src);
/* Base16 decoding */
/* Maximum length of output for base16_decode_update. */
/* We have at most 4 buffered bits, and a total of (length + 1) * 4 bits. */
#define BASE16_DECODE_LENGTH(length) (((length) + 1) / 2)
struct base16_decode_ctx
{
unsigned word; /* Leftover bits */
unsigned bits; /* Number buffered bits */
};
void
base16_decode_init(struct base16_decode_ctx *ctx);
/* Decodes a single byte. Returns amount of output (0 or 1), or -1 on
* errors. */
int
base16_decode_single(struct base16_decode_ctx *ctx,
uint8_t *dst,
uint8_t src);
/* Returns 1 on success, 0 on error. DST should point to an area of
* size at least BASE16_DECODE_LENGTH(length), and for sanity
* checking, *DST_LENGTH should be initialized to the size of that
* area before the call. *DST_LENGTH is updated to the amount of
* decoded output. */
/* Currently results in an assertion failure if *DST_LENGTH is
* too small. FIXME: Return some error instead? */
int
base16_decode_update(struct base16_decode_ctx *ctx,
unsigned *dst_length,
uint8_t *dst,
unsigned src_length,
const uint8_t *src);
/* Returns 1 on success. */
int
base16_decode_final(struct base16_decode_ctx *ctx);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_BASE16_H_INCLUDED */
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