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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    des-compat.c 5.43 KiB
    /* des-compat.h
     *
     * The des block cipher, libdes/openssl-style interface.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 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.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <string.h>
    #include <assert.h>
    
    #include "des-compat.h"
    
    #include "cbc.h"
    #include "macros.h"
    #include "memxor.h"
    
    struct des_compat_des3 { const struct des_ctx *keys[3]; }; 
    
    static void
    des_compat_des3_encrypt(struct des_compat_des3 *ctx,
    			uint32_t length, uint8_t *dst, const uint8_t *src)
    {
      nettle_des_encrypt(ctx->keys[0], length, dst, src);
      nettle_des_decrypt(ctx->keys[1], length, dst, dst);
      nettle_des_encrypt(ctx->keys[2], length, dst, dst);
    }
    
    static void
    des_compat_des3_decrypt(struct des_compat_des3 *ctx,
    			uint32_t length, uint8_t *dst, const uint8_t *src)
    {
      nettle_des_decrypt(ctx->keys[2], length, dst, src);
      nettle_des_encrypt(ctx->keys[1], length, dst, dst);
      nettle_des_decrypt(ctx->keys[0], length, dst, dst);
    }
    
    void
    des_ecb3_encrypt(const_des_cblock *src, des_cblock *dst,
    		 des_key_schedule k1,
    		 des_key_schedule k2,
    		 des_key_schedule k3, int enc)
    {
      struct des_compat_des3 keys;
      keys.keys[0] = k1;
      keys.keys[1] = k2;
      keys.keys[2] = k3;
    
      ((enc == DES_ENCRYPT) ? des_compat_des3_encrypt : des_compat_des3_decrypt)