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/* arcfour.h --- The arcfour stream cipher
* Copyright (C) 2000-2005, 2009-2021 Free Software Foundation, Inc.
*
* This file 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.
*
* This file 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 this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */
#ifndef ARCFOUR_H
# define ARCFOUR_H
# include <stddef.h>
# include <stdint.h>
#define ARCFOUR_SBOX_SIZE 256
typedef struct
{
char sbox[ARCFOUR_SBOX_SIZE];
uint8_t idx_i, idx_j;
} arcfour_context;
/* Apply ARCFOUR stream to INBUF placing the result in OUTBUF, both of
LENGTH size. CONTEXT must be initialized with arcfour_setkey
before this function is called. */
extern void
arcfour_stream (arcfour_context * context,
const char *inbuf, char *restrict outbuf, size_t length);
/* Initialize CONTEXT using encryption KEY of KEYLEN bytes. KEY
should be 40 bits (5 bytes) or longer. The KEY cannot be zero
length. */
extern void
arcfour_setkey (arcfour_context * context, const char *key, size_t keylen);
#endif /* ARCFOUR_H */
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