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/* salsa20.h
*
* The Salsa20 stream cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2012 Simon Josefsson
* Copyright (C) 2001 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_SALSA20_H_INCLUDED
#define NETTLE_SALSA20_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define salsa20_set_key nettle_salsa20_set_key
#define salsa20_set_iv nettle_salsa20_set_iv
#define salsa20_crypt nettle_salsa20_crypt
#define _salsa20_core _nettle_salsa20_core
#define salsa20r12_crypt nettle_salsa20r12_crypt
/* Minimum and maximum keysizes, and a reasonable default. In
* octets.*/
#define SALSA20_MIN_KEY_SIZE 16
#define SALSA20_MAX_KEY_SIZE 32
#define SALSA20_KEY_SIZE 32
#define SALSA20_BLOCK_SIZE 64
#define SALSA20_IV_SIZE 8
#define _SALSA20_INPUT_LENGTH 16
struct salsa20_ctx
{
/* Indices 1-4 and 11-14 holds the key (two identical copies for the
shorter key size), indices 0, 5, 10, 15 are constant, indices 6, 7
are the IV, and indices 8, 9 are the block counter:
C K K K
K C I I
B B C K
K K K C
*/
uint32_t input[_SALSA20_INPUT_LENGTH];
};
void
salsa20_set_key(struct salsa20_ctx *ctx,
unsigned length, const uint8_t *key);
void
salsa20_set_iv(struct salsa20_ctx *ctx, const uint8_t *iv);
void
salsa20_crypt(struct salsa20_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
salsa20r12_crypt(struct salsa20_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
_salsa20_core(uint32_t *dst, const uint32_t *src, unsigned rounds);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_SALSA20_H_INCLUDED */
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