crypto/bf/bf_skey.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <string.h>
  60 #include <openssl/blowfish.h>
  61 #include "bf_locl.h"
  62 #include "bf_pi.h"
  63
  64 void BF_set_key(BF_KEY *key, int len, const unsigned char *data)
  65 {
  66     int i;
  67     BF_LONG *p, ri, in[2];
  68     const unsigned char *d, *end;
  69
  70     memcpy(key, &bf_init, sizeof(BF_KEY));
  71     p = key->P;
  72
  73     if (len > ((BF_ROUNDS + 2) * 4))
  74         len = (BF_ROUNDS + 2) * 4;
  75
  76     d = data;
  77     end = &(data[len]);
  78     for (i = 0; i < (BF_ROUNDS + 2); i++) {
  79         ri = *(d++);
  80         if (d >= end)
  81             d = data;
  82
  83         ri <<= 8;
  84         ri |= *(d++);
  85         if (d >= end)
  86             d = data;
  87
  88         ri <<= 8;
  89         ri |= *(d++);
  90         if (d >= end)
  91             d = data;
  92
  93         ri <<= 8;
  94         ri |= *(d++);
  95         if (d >= end)
  96             d = data;
  97
  98         p[i] ^= ri;
  99     }
 100
 101     in[0] = 0L;
 102     in[1] = 0L;
 103     for (i = 0; i < (BF_ROUNDS + 2); i += 2) {
 104         BF_encrypt(in, key);
 105         p[i] = in[0];
 106         p[i + 1] = in[1];
 107     }
 108
 109     p = key->S;
 110     for (i = 0; i < 4 * 256; i += 2) {
 111         BF_encrypt(in, key);
 112         p[i] = in[0];
 113         p[i + 1] = in[1];
 114     }
 115 }