bf_skey.c

Solaris操作系统下的过滤驱动程序, C源码程序.

/* crypto/bf/bf_skey.c */
/* Copyright (C) 1995-1997 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([e-mail]).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([e-mail])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([e-mail])"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include "blowfish.h"
#include "bf_locl.h"
#include "bf_pi.h"

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#ifdef FISTGEN
# include "fist_cryptfs.h"
#endif /* FISTGEN */
#include <fist.h>
#include <cryptfs.h>


void
BF_set_key(key, len, data)
     BF_KEY *key;
     int len;
     unsigned char *data;
{
  int i;
  BF_LONG *p, ri, in[2];
  unsigned char *d, *end;

  memcpy((char *) key, (char *) &bf_init, sizeof(BF_KEY));
  p = key->P;

  if (len > ((BF_ROUNDS + 2) * 4))
    len = (BF_ROUNDS + 2) * 4;

  d = data;
  end = &(data[len]);
  for (i = 0; i < (BF_ROUNDS + 2); i++) {
    ri = *(d++);
    if (d >= end)
      d = data;

    ri <<= 8;
    ri |= *(d++);
    if (d >= end)
      d = data;

    ri <<= 8;
    ri |= *(d++);
    if (d >= end)
      d = data;

    ri <<= 8;
    ri |= *(d++);
    if (d >= end)
      d = data;

    p[i] ^= ri;
  }

  in[0] = 0L;
  in[1] = 0L;
  for (i = 0; i < (BF_ROUNDS + 2); i += 2) {
    BF_encrypt(in, key, BF_ENCRYPT);
    p[i] = in[0];
    p[i + 1] = in[1];
  }

  p = key->S;
  for (i = 0; i < 4 * 256; i += 2) {
    BF_encrypt(in, key, BF_ENCRYPT);
    p[i] = in[0];
    p[i + 1] = in[1];
  }
}