blowfish.h 2.11 KB
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/* blowfish.h
 *
 * Blowfish block cipher.
 */

/* nettle, low-level cryptographics library
 *
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 * Copyright (C) 1998, 2001 FSF, Ray Dassen, 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.
 * 
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 * The nettle library is distributed in the hope that it will be useful, but
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 * 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_BLOWFISH_H_INCLUDED
#define NETTLE_BLOWFISH_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 blowfish_set_key nettle_blowfish_set_key
#define blowfish_encrypt nettle_blowfish_encrypt
#define blowfish_decrypt nettle_blowfish_decrypt

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#define BLOWFISH_BLOCK_SIZE 8

/* Variable key size between 64 and 448 bits. */
#define BLOWFISH_MIN_KEY_SIZE 8
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#define BLOWFISH_MAX_KEY_SIZE 56
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/* Default to 128 bits */
#define BLOWFISH_KEY_SIZE 16

#define _BLOWFISH_ROUNDS 16

struct blowfish_ctx
{
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  uint32_t s[4][256];
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  uint32_t p[_BLOWFISH_ROUNDS+2];
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};

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/* On success, returns 1 and sets ctx->status to BLOWFISH_OK (zero).
 * On error, returns 0 and sets ctx->status to BLOWFISH_WEAK_KEY. */
int
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blowfish_set_key(struct blowfish_ctx *ctx,
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                 size_t length, const uint8_t *key);
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void
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blowfish_encrypt(const struct blowfish_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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blowfish_decrypt(const struct blowfish_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_BLOWFISH_H_INCLUDED */