The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/crypto/blowfish/bf_skey.c

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    1 /*      $FreeBSD: releng/5.0/sys/crypto/blowfish/bf_skey.c 91671 2002-03-05 09:19:02Z ume $     */
    2 /*      $KAME: bf_skey.c,v 1.7 2002/02/27 01:33:59 itojun Exp $ */
    3 
    4 /* crypto/bf/bf_skey.c */
    5 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
    6  * All rights reserved.
    7  *
    8  * This package is an SSL implementation written
    9  * by Eric Young (eay@mincom.oz.au).
   10  * The implementation was written so as to conform with Netscapes SSL.
   11  *
   12  * This library is free for commercial and non-commercial use as long as
   13  * the following conditions are aheared to.  The following conditions
   14  * apply to all code found in this distribution, be it the RC4, RSA,
   15  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   16  * included with this distribution is covered by the same copyright terms
   17  * except that the holder is Tim Hudson (tjh@mincom.oz.au).
   18  *
   19  * Copyright remains Eric Young's, and as such any Copyright notices in
   20  * the code are not to be removed.
   21  * If this package is used in a product, Eric Young should be given attribution
   22  * as the author of the parts of the library used.
   23  * This can be in the form of a textual message at program startup or
   24  * in documentation (online or textual) provided with the package.
   25  *
   26  * Redistribution and use in source and binary forms, with or without
   27  * modification, are permitted provided that the following conditions
   28  * are met:
   29  * 1. Redistributions of source code must retain the copyright
   30  *    notice, this list of conditions and the following disclaimer.
   31  * 2. Redistributions in binary form must reproduce the above copyright
   32  *    notice, this list of conditions and the following disclaimer in the
   33  *    documentation and/or other materials provided with the distribution.
   34  * 3. All advertising materials mentioning features or use of this software
   35  *    must display the following acknowledgement:
   36  *    "This product includes cryptographic software written by
   37  *     Eric Young (eay@mincom.oz.au)"
   38  *    The word 'cryptographic' can be left out if the rouines from the library
   39  *    being used are not cryptographic related :-).
   40  * 4. If you include any Windows specific code (or a derivative thereof) from
   41  *    the apps directory (application code) you must include an acknowledgement:
   42  *    "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
   43  *
   44  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   54  * SUCH DAMAGE.
   55  *
   56  * The licence and distribution terms for any publically available version or
   57  * derivative of this code cannot be changed.  i.e. this code cannot simply be
   58  * copied and put under another distribution licence
   59  * [including the GNU Public Licence.]
   60  */
   61 
   62 #include <sys/types.h>
   63 #include <sys/time.h>
   64 #include <sys/systm.h>
   65 #include <crypto/blowfish/blowfish.h>
   66 #include <crypto/blowfish/bf_locl.h>
   67 #include <crypto/blowfish/bf_pi.h>
   68 
   69 void
   70 BF_set_key(key, len, data)
   71         BF_KEY *key;
   72         int len;
   73         unsigned char *data;
   74 {
   75         int i;
   76         BF_LONG *p, ri, in[2];
   77         unsigned char *d, *end;
   78 
   79         memcpy((char *)key, (const char *)&bf_init, sizeof(BF_KEY));
   80         p = key->P;
   81 
   82         if (len > ((BF_ROUNDS + 2) * 4))
   83                 len = (BF_ROUNDS + 2) * 4;
   84 
   85         d = data;
   86         end= &(data[len]);
   87         for (i = 0; i < BF_ROUNDS + 2; i++) {
   88                 ri = *(d++);
   89                 if (d >= end) d = data;
   90 
   91                 ri <<= 8;
   92                 ri |= *(d++);
   93                 if (d >= end) d = data;
   94 
   95                 ri <<= 8;
   96                 ri |= *(d++);
   97                 if (d >= end) d = data;
   98 
   99                 ri <<= 8;
  100                 ri |= *(d++);
  101                 if (d >= end) d = data;
  102 
  103                 p[i] ^= ri;
  104         }
  105 
  106         in[0] = 0L;
  107         in[1] = 0L;
  108         for (i = 0; i < BF_ROUNDS + 2; i += 2) {
  109                 BF_encrypt(in, key);
  110                 p[i  ] = in[0];
  111                 p[i+1] = in[1];
  112         }
  113 
  114         p = key->S;
  115         for (i = 0; i < 4 * 256; i += 2) {
  116                 BF_encrypt(in, key);
  117                 p[i  ] = in[0];
  118                 p[i+1] = in[1];
  119         }
  120 }

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