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xenofarm.sh

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  • twofish.h 1.83 KiB
    /* twofish.h
     *
     * The twofish block cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 Niels Mller
     *  
     * 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., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, USA.
     */
    
    /*
     * Twofish is a 128-bit block cipher that accepts a variable-length
     * key up to 256 bits, designed by Bruce Schneier and others.  See
     * http://www.counterpane.com/twofish.html for details.
     */
    
    #ifndef NETTLE_TWOFISH_H_INCLUDED
    #define NETTLE_TWOFISH_H_INCLUDED
    
    #include <inttypes.h>
    
    #define TWOFISH_BLOCK_SIZE 16
    
    /* Variable key size between 128 and 256 bits. But the only valid
     * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
    #define TWOFISH_MIN_KEY_SIZE 16
    #define TWOFISH_MAX_KEY_SIZE 32
    
    #define TWOFISH_KEY_SIZE 32
    
    struct twofish_ctx
    {
      uint32_t keys[40];
      uint32_t s_box[4][256];
    };
    
    void
    twofish_set_key(struct twofish_ctx *ctx,
    		unsigned length, const uint8_t *key);
    
    void
    twofish_encrypt(struct twofish_ctx *ctx,
    		unsigned length, uint8_t *dst,
    		const uint8_t *src);
    void
    twofish_decrypt(struct twofish_ctx *ctx,
    		unsigned length, uint8_t *dst,
    		const uint8_t *src);
    
    #endif /* NETTLE_TWOFISH_H_INCLUDED */