bsd/crypto/blowfish/bf_skey.c

   1 /*      $FreeBSD: src/sys/crypto/blowfish/bf_skey.c,v 1.1.2.3 2002/03/26 10:12:23 ume Exp $     */
   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 }