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/* arctwo.h --- The arctwo block cipher
* Copyright (C) 2000-2003, 2005, 2009-2022 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 ARCTWO_H
# define ARCTWO_H
# include <stddef.h>
# include <stdint.h>
typedef struct
{
uint16_t S[64];
} arctwo_context;
#define ARCTWO_BLOCK_SIZE 8
/* Initialize CONTEXT using KEY of KEYLEN length. If
EFFECTIVE_KEYLEN, truncate the key (using a special algorithm) to
only be of EFFECTIVE_KEYLEN bits. Normally, you use
EFFECTIVE_KEYLEN of 0, but see RFC 2268 for more information. */
void
arctwo_setkey_ekb (arctwo_context *context,
size_t keylen, const char *key, size_t effective_keylen);
#define arctwo_setkey(context,keylen,key) \
arctwo_setkey_ekb (context, keylen, key, 8 * (keylen))
/* Encrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a
multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the encryption key,
and must have been initialized with arctwo_setkey or
arctwo_setkey_ekb. */
extern void
arctwo_encrypt (arctwo_context *context, const char *inbuf,
char *restrict outbuf, size_t length);
/* Decrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a
multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the decryption key,
and must have been initialized with arctwo_setkey or
arctwo_setkey_ekb. */
extern void
arctwo_decrypt (arctwo_context *context, const char *inbuf,
char *restrict outbuf, size_t length);
#endif /* ARCTWO_H */
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