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write_buffer.c

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  • arcfour-crypt.c 1.43 KiB
    /* arcfour-crypt.c
     *
     * The arcfour/rc4 stream cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001, 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.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    
    #include "arcfour.h"
    
    void
    arcfour_crypt(struct arcfour_ctx *ctx,
    	      unsigned length, uint8_t *dst,
    	      const uint8_t *src)
    {
      register uint8_t i, j;
      register int si, sj;
    
      i = ctx->i; j = ctx->j;
      while(length--)
        {
          i++; i &= 0xff;
          si = ctx->S[i];
          j += si; j &= 0xff;
          sj = ctx->S[i] = ctx->S[j];
          ctx->S[j] = si;
          *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
        }
      ctx->i = i; ctx->j = j;
    }