src/libstrongswan/plugins/blowfish/bf_skey.c

   1 /* crypto/bf/bf_skey.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are adhered to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the routines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #ifdef __KERNEL__
  60 #include <linux/types.h>
  61 #include <linux/string.h>
  62 #else
  63 #include <stdio.h>
  64 #include <string.h>
  65 #endif
  66
  67 #include "blowfish.h"
  68 #include "bf_locl.h"
  69 #include "bf_pi.h"
  70
  71 void BF_set_key(BF_KEY *key, int len, const unsigned char *data)
  72         {
  73         int i;
  74         BF_LONG *p,ri,in[2];
  75         const unsigned char *d,*end;
  76
  77
  78         memcpy((char *)key,(const char *)&bf_init,sizeof(BF_KEY));
  79         p=key->P;
  80
  81         if (len > ((BF_ROUNDS+2)*4)) len=(BF_ROUNDS+2)*4;
  82
  83         d=data;
  84         end= &(data[len]);
  85         for (i=0; i<(BF_ROUNDS+2); i++)
  86                 {
  87                 ri= *(d++);
  88                 if (d >= end) d=data;
  89
  90                 ri<<=8;
  91                 ri|= *(d++);
  92                 if (d >= end) d=data;
  93
  94                 ri<<=8;
  95                 ri|= *(d++);
  96                 if (d >= end) d=data;
  97
  98                 ri<<=8;
  99                 ri|= *(d++);
 100                 if (d >= end) d=data;
 101
 102                 p[i]^=ri;
 103                 }
 104
 105         in[0]=0L;
 106         in[1]=0L;
 107         for (i=0; i<(BF_ROUNDS+2); i+=2)
 108                 {
 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                 {
 117                 BF_encrypt(in,key);
 118                 p[i  ]=in[0];
 119                 p[i+1]=in[1];
 120                 }
 121         }
 122