cast128.h 1.98 KB
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/* cast128.h
 *
 * The CAST-128 block cipher.
 */

/*	CAST-128 in C
 *	Written by Steve Reid <sreid@sea-to-sky.net>
 *	100% Public Domain - no warranty
 *	Released 1997.10.11
 */

/* nettle, low-level cryptographics library
 *
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 * Copyright (C) 2001 Niels Möller
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 *  
 * 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
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 * along with the nettle library; see the file COPYING.LIB.  If not, write to
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 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02111-1301, USA.
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 */
 
#ifndef NETTLE_CAST128_H_INCLUDED
#define NETTLE_CAST128_H_INCLUDED

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#include "nettle-types.h"
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#ifdef __cplusplus
extern "C" {
#endif

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/* Name mangling */
#define cast128_set_key nettle_cast128_set_key
#define cast128_encrypt nettle_cast128_encrypt
#define cast128_decrypt nettle_cast128_decrypt

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#define CAST128_BLOCK_SIZE 8

/* Variable key size between 40 and 128. */
#define CAST128_MIN_KEY_SIZE 5
#define CAST128_MAX_KEY_SIZE 16

#define CAST128_KEY_SIZE 16

struct cast128_ctx
{
  uint32_t keys[32];  /* Key, after expansion */
  unsigned rounds;    /* Number of rounds to use, 12 or 16 */
};

void
cast128_set_key(struct cast128_ctx *ctx,
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		size_t length, const uint8_t *key);
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void
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cast128_encrypt(const struct cast128_ctx *ctx,
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		size_t length, uint8_t *dst,
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		const uint8_t *src);
void
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cast128_decrypt(const struct cast128_ctx *ctx,
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		size_t length, uint8_t *dst,
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		const uint8_t *src);

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#ifdef __cplusplus
}
#endif

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#endif /* NETTLE_CAST128_H_INCLUDED */