lib/libcrypto/des/str2key.c

   1 /* $OpenBSD: str2key.c,v 1.10 2015/09/10 15:56:25 jsing Exp $ */
   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 <openssl/crypto.h>
  60 #include "des_locl.h"
  61
  62 void DES_string_to_key(const char *str, DES_cblock *key)
  63         {
  64         DES_key_schedule ks;
  65         int i,length;
  66         unsigned char j;
  67
  68         memset(key,0,8);
  69         length=strlen(str);
  70 #ifdef OLD_STR_TO_KEY
  71         for (i=0; i<length; i++)
  72                 (*key)[i%8]^=(str[i]<<1);
  73 #else /* MIT COMPATIBLE */
  74         for (i=0; i<length; i++)
  75                 {
  76                 j=str[i];
  77                 if ((i%16) < 8)
  78                         (*key)[i%8]^=(j<<1);
  79                 else
  80                         {
  81                         /* Reverse the bit order 05/05/92 eay */
  82                         j=((j<<4)&0xf0)|((j>>4)&0x0f);
  83                         j=((j<<2)&0xcc)|((j>>2)&0x33);
  84                         j=((j<<1)&0xaa)|((j>>1)&0x55);
  85                         (*key)[7-(i%8)]^=j;
  86                         }
  87                 }
  88 #endif
  89         DES_set_odd_parity(key);
  90 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
  91         if(DES_is_weak_key(key))
  92             (*key)[7] ^= 0xF0;
  93         DES_set_key(key,&ks);
  94 #else
  95         DES_set_key_unchecked(key,&ks);
  96 #endif
  97         DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key);
  98         explicit_bzero(&ks,sizeof(ks));
  99         DES_set_odd_parity(key);
 100         }
 101
 102 void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
 103         {
 104         DES_key_schedule ks;
 105         int i,length;
 106         unsigned char j;
 107
 108         memset(key1,0,8);
 109         memset(key2,0,8);
 110         length=strlen(str);
 111 #ifdef OLD_STR_TO_KEY
 112         if (length <= 8)
 113                 {
 114                 for (i=0; i<length; i++)
 115                         {
 116                         (*key2)[i]=(*key1)[i]=(str[i]<<1);
 117                         }
 118                 }
 119         else
 120                 {
 121                 for (i=0; i<length; i++)
 122                         {
 123                         if ((i/8)&1)
 124                                 (*key2)[i%8]^=(str[i]<<1);
 125                         else
 126                                 (*key1)[i%8]^=(str[i]<<1);
 127                         }
 128                 }
 129 #else /* MIT COMPATIBLE */
 130         for (i=0; i<length; i++)
 131                 {
 132                 j=str[i];
 133                 if ((i%32) < 16)
 134                         {
 135                         if ((i%16) < 8)
 136                                 (*key1)[i%8]^=(j<<1);
 137                         else
 138                                 (*key2)[i%8]^=(j<<1);
 139                         }
 140                 else
 141                         {
 142                         j=((j<<4)&0xf0)|((j>>4)&0x0f);
 143                         j=((j<<2)&0xcc)|((j>>2)&0x33);
 144                         j=((j<<1)&0xaa)|((j>>1)&0x55);
 145                         if ((i%16) < 8)
 146                                 (*key1)[7-(i%8)]^=j;
 147                         else
 148                                 (*key2)[7-(i%8)]^=j;
 149                         }
 150                 }
 151         if (length <= 8) memcpy(key2,key1,8);
 152 #endif
 153         DES_set_odd_parity(key1);
 154         DES_set_odd_parity(key2);
 155 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
 156         if(DES_is_weak_key(key1))
 157             (*key1)[7] ^= 0xF0;
 158         DES_set_key(key1,&ks);
 159 #else
 160         DES_set_key_unchecked(key1,&ks);
 161 #endif
 162         DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1);
 163 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
 164         if(DES_is_weak_key(key2))
 165             (*key2)[7] ^= 0xF0;
 166         DES_set_key(key2,&ks);
 167 #else
 168         DES_set_key_unchecked(key2,&ks);
 169 #endif
 170         DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2);
 171         explicit_bzero(&ks,sizeof(ks));
 172         DES_set_odd_parity(key1);
 173         DES_set_odd_parity(key2);
 174         }