crypto/openssl/crypto/des/str2key.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 <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     register 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         j = str[i];
  76         if ((i % 16) < 8)
  77             (*key)[i % 8] ^= (j << 1);
  78         else {
  79             /* Reverse the bit order 05/05/92 eay */
  80             j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);
  81             j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);
  82             j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);
  83             (*key)[7 - (i % 8)] ^= j;
  84         }
  85     }
  86 #endif
  87     DES_set_odd_parity(key);
  88 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
  89     if (DES_is_weak_key(key))
  90         (*key)[7] ^= 0xF0;
  91     DES_set_key(key, &ks);
  92 #else
  93     DES_set_key_unchecked(key, &ks);
  94 #endif
  95     DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key);
  96     OPENSSL_cleanse(&ks, sizeof(ks));
  97     DES_set_odd_parity(key);
  98 }
  99
 100 void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
 101 {
 102     DES_key_schedule ks;
 103     int i, length;
 104     register unsigned char j;
 105
 106     memset(key1, 0, 8);
 107     memset(key2, 0, 8);
 108     length = strlen(str);
 109 #ifdef OLD_STR_TO_KEY
 110     if (length <= 8) {
 111         for (i = 0; i < length; i++) {
 112             (*key2)[i] = (*key1)[i] = (str[i] << 1);
 113         }
 114     } else {
 115         for (i = 0; i < length; i++) {
 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         j = str[i];
 125         if ((i % 32) < 16) {
 126             if ((i % 16) < 8)
 127                 (*key1)[i % 8] ^= (j << 1);
 128             else
 129                 (*key2)[i % 8] ^= (j << 1);
 130         } else {
 131             j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);
 132             j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);
 133             j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);
 134             if ((i % 16) < 8)
 135                 (*key1)[7 - (i % 8)] ^= j;
 136             else
 137                 (*key2)[7 - (i % 8)] ^= j;
 138         }
 139     }
 140     if (length <= 8)
 141         memcpy(key2, key1, 8);
 142 #endif
 143     DES_set_odd_parity(key1);
 144     DES_set_odd_parity(key2);
 145 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
 146     if (DES_is_weak_key(key1))
 147         (*key1)[7] ^= 0xF0;
 148     DES_set_key(key1, &ks);
 149 #else
 150     DES_set_key_unchecked(key1, &ks);
 151 #endif
 152     DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
 153 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
 154     if (DES_is_weak_key(key2))
 155         (*key2)[7] ^= 0xF0;
 156     DES_set_key(key2, &ks);
 157 #else
 158     DES_set_key_unchecked(key2, &ks);
 159 #endif
 160     DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);
 161     OPENSSL_cleanse(&ks, sizeof(ks));
 162     DES_set_odd_parity(key1);
 163     DES_set_odd_parity(key2);
 164 }