crypto/external/bsd/openssl/lib/libdes/ostr2key.c

   1 /* crypto/des/str2key.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 aheared 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 rouines 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 #include "des_locl.h"
  60
  61 void des_string_to_key(const char *str, des_cblock *key)
  62         {
  63         des_key_schedule ks;
  64         int i,length;
  65         register unsigned char j;
  66
  67         memset(key,0,8);
  68         length=strlen(str);
  69 #ifdef OLD_STR_TO_KEY
  70         for (i=0; i<length; i++)
  71                 (*key)[i%8]^=(str[i]<<1);
  72 #else /* MIT COMPATIBLE */
  73         for (i=0; i<length; i++)
  74                 {
  75                 j=str[i];
  76                 if ((i%16) < 8)
  77                         (*key)[i%8]^=(j<<1);
  78                 else
  79                         {
  80                         /* Reverse the bit order 05/05/92 eay */
  81                         j=((j<<4)&0xf0)|((j>>4)&0x0f);
  82                         j=((j<<2)&0xcc)|((j>>2)&0x33);
  83                         j=((j<<1)&0xaa)|((j>>1)&0x55);
  84                         (*key)[7-(i%8)]^=j;
  85                         }
  86                 }
  87 #endif
  88         des_set_odd_parity(key);
  89         des_set_key_unchecked(key,ks);
  90         des_cbc_cksum((const unsigned char*)str,key,length,ks,key);
  91         OPENSSL_cleanse(ks,sizeof(ks));
  92         des_set_odd_parity(key);
  93         }
  94
  95 void des_string_to_2keys(const char *str, des_cblock *key1, des_cblock *key2)
  96         {
  97         des_key_schedule ks;
  98         int i,length;
  99         register unsigned char j;
 100
 101         memset(key1,0,8);
 102         memset(key2,0,8);
 103         length=strlen(str);
 104 #ifdef OLD_STR_TO_KEY
 105         if (length <= 8)
 106                 {
 107                 for (i=0; i<length; i++)
 108                         {
 109                         (*key2)[i]=(*key1)[i]=(str[i]<<1);
 110                         }
 111                 }
 112         else
 113                 {
 114                 for (i=0; i<length; i++)
 115                         {
 116                         if ((i/8)&1)
 117                                 (*key2)[i%8]^=(str[i]<<1);
 118                         else
 119                                 (*key1)[i%8]^=(str[i]<<1);
 120                         }
 121                 }
 122 #else /* MIT COMPATIBLE */
 123         for (i=0; i<length; i++)
 124                 {
 125                 j=str[i];
 126                 if ((i%32) < 16)
 127                         {
 128                         if ((i%16) < 8)
 129                                 (*key1)[i%8]^=(j<<1);
 130                         else
 131                                 (*key2)[i%8]^=(j<<1);
 132                         }
 133                 else
 134                         {
 135                         j=((j<<4)&0xf0)|((j>>4)&0x0f);
 136                         j=((j<<2)&0xcc)|((j>>2)&0x33);
 137                         j=((j<<1)&0xaa)|((j>>1)&0x55);
 138                         if ((i%16) < 8)
 139                                 (*key1)[7-(i%8)]^=j;
 140                         else
 141                                 (*key2)[7-(i%8)]^=j;
 142                         }
 143                 }
 144         if (length <= 8) memcpy(key2,key1,8);
 145 #endif
 146         des_set_odd_parity(key1);
 147         des_set_odd_parity(key2);
 148         des_set_key_unchecked(key1,ks);
 149         des_cbc_cksum((const unsigned char*)str,key1,length,ks,key1);
 150         des_set_key_unchecked(key2,ks);
 151         des_cbc_cksum((const unsigned char*)str,key2,length,ks,key2);
 152         OPENSSL_cleanse(ks,sizeof(ks));
 153         des_set_odd_parity(key1);
 154         des_set_odd_parity(key2);
 155         }