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arctwo.h

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  • Forked from Nettle / nettle
    1899 commits behind the upstream repository.
    arctwo.h 2.33 KiB
    /* arctwo.h
     *
     * The arctwo/rfc2268 block cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2004 Simon Josefsson
     * Copyright (C) 2002, 2004 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_ARCTWO_H_INCLUDED
    #define NETTLE_ARCTWO_H_INCLUDED
    
    #include "nettle-types.h"
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    /* Name mangling */
    #define arctwo_set_key nettle_arctwo_set_key
    #define arctwo_set_key_ekb nettle_arctwo_set_key_ekb
    #define arctwo_encrypt nettle_arctwo_encrypt
    #define arctwo_decrypt nettle_arctwo_decrypt
    #define arctwo_set_key_gutmann nettle_arctwo_set_key_gutmann
    
    #define ARCTWO_BLOCK_SIZE 8
    
    /* Variable key size from 1 byte to 128 bytes. */
    #define ARCTWO_MIN_KEY_SIZE 1
    #define ARCTWO_MAX_KEY_SIZE 128
    
    #define ARCTWO_KEY_SIZE 8
    
    struct arctwo_ctx
    {
      uint16_t S[64];
    };
    
    /* Key expansion function that takes the "effective key bits", 1-1024,
       as an explicit argument. 0 means maximum key bits. */
    void
    arctwo_set_key_ekb (struct arctwo_ctx *ctx,
    		    size_t length, const uint8_t * key, unsigned ekb);
    
    /* Equvivalent to arctwo_set_key_ekb, with ekb = 8 * length */
    void
    arctwo_set_key (struct arctwo_ctx *ctx, size_t length, const uint8_t *key);
    
    /* Equvivalent to arctwo_set_key_ekb, with ekb = 1024 */
    void
    arctwo_set_key_gutmann (struct arctwo_ctx *ctx,
    			size_t length, const uint8_t *key);
    
    void
    arctwo_encrypt (struct arctwo_ctx *ctx,
    		size_t length, uint8_t *dst, const uint8_t *src);
    void
    arctwo_decrypt (struct arctwo_ctx *ctx,
    		size_t length, uint8_t *dst, const uint8_t *src);
    
    #ifdef __cplusplus
    }
    #endif
    
    #endif /* NETTLE_ARCTWO_H_INCLUDED */