sunrpc/xcrypt.c

   1 /*
   2  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  *       copyright notice, this list of conditions and the following
  12  *       disclaimer in the documentation and/or other materials
  13  *       provided with the distribution.
  14  *     * Neither the name of Sun Microsystems, Inc. nor the names of its
  15  *       contributors may be used to endorse or promote products derived
  16  *       from this software without specific prior written permission.
  17  *
  18  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  23  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  25  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if 0
  33 #ident  "@(#)xcrypt.c   1.11    94/08/23 SMI"
  34 #endif
  35
  36 #if !defined(lint) && defined(SCCSIDS)
  37 static char sccsid[] = "@(#)xcrypt.c 1.3 89/03/24 Copyr 1986 Sun Micro";
  38 #endif
  39
  40 /*
  41  * xcrypt.c: Hex encryption/decryption and utility routines
  42  */
  43
  44 #include <ctype.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sys/types.h>
  49 #include <rpc/des_crypt.h>
  50
  51 static const char hex[16] =
  52 {
  53   '0', '1', '2', '3', '4', '5', '6', '7',
  54   '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  55 };
  56
  57
  58 #ifdef _LIBC
  59 # define hexval(c) \
  60   (c >= '0' && c <= '9'                                                       \
  61    ? c - '0'                                                                  \
  62    : ({ int upp = toupper (c);                                                \
  63         upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))
  64 #else
  65 static char hexval (char) internal_function;
  66 #endif
  67
  68 static void hex2bin (int, char *, char *) internal_function;
  69 static void bin2hex (int, unsigned char *, char *) internal_function;
  70 void passwd2des_internal (char *pw, char *key);
  71 #ifdef _LIBC
  72 libc_hidden_proto (passwd2des_internal)
  73 #endif
  74
  75 /*
  76  * Turn password into DES key
  77  */
  78 void
  79 passwd2des_internal (char *pw, char *key)
  80 {
  81   int i;
  82
  83   memset (key, 0, 8);
  84   for (i = 0; *pw && i < 8; ++i)
  85     key[i] ^= *pw++ << 1;
  86
  87   des_setparity (key);
  88 }
  89
  90 #ifdef _LIBC
  91 libc_hidden_def (passwd2des_internal)
  92 strong_alias (passwd2des_internal, passwd2des)
  93 #else
  94 void passwd2des (char *pw, char *key)
  95 {
  96   return passwd2des_internal (pw, key);
  97 }
  98 #endif
  99
 100 /*
 101  * Encrypt a secret key given passwd
 102  * The secret key is passed and returned in hex notation.
 103  * Its length must be a multiple of 16 hex digits (64 bits).
 104  */
 105 int
 106 xencrypt (char *secret, char *passwd)
 107 {
 108   char key[8];
 109   char ivec[8];
 110   char *buf;
 111   int err;
 112   int len;
 113
 114   len = strlen (secret) / 2;
 115   buf = malloc ((unsigned) len);
 116   hex2bin (len, secret, buf);
 117   passwd2des_internal (passwd, key);
 118   memset (ivec, 0, 8);
 119
 120   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
 121   if (DES_FAILED (err))
 122     {
 123       free (buf);
 124       return 0;
 125     }
 126   bin2hex (len, (unsigned char *) buf, secret);
 127   free (buf);
 128   return 1;
 129 }
 130
 131 /*
 132  * Decrypt secret key using passwd
 133  * The secret key is passed and returned in hex notation.
 134  * Once again, the length is a multiple of 16 hex digits
 135  */
 136 int
 137 xdecrypt (char *secret, char *passwd)
 138 {
 139   char key[8];
 140   char ivec[8];
 141   char *buf;
 142   int err;
 143   int len;
 144
 145   len = strlen (secret) / 2;
 146   buf = malloc ((unsigned) len);
 147
 148   hex2bin (len, secret, buf);
 149   passwd2des_internal (passwd, key);
 150   memset (ivec, 0, 8);
 151
 152   err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
 153   if (DES_FAILED (err))
 154     {
 155       free (buf);
 156       return 0;
 157     }
 158   bin2hex (len, (unsigned char *) buf, secret);
 159   free (buf);
 160   return 1;
 161 }
 162
 163 /*
 164  * Hex to binary conversion
 165  */
 166 static void
 167 internal_function
 168 hex2bin (int len, char *hexnum, char *binnum)
 169 {
 170   int i;
 171
 172   for (i = 0; i < len; i++)
 173     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 174 }
 175
 176 /*
 177  * Binary to hex conversion
 178  */
 179 static void
 180 internal_function
 181 bin2hex (int len, unsigned char *binnum, char *hexnum)
 182 {
 183   int i;
 184   unsigned val;
 185
 186   for (i = 0; i < len; i++)
 187     {
 188       val = binnum[i];
 189       hexnum[i * 2] = hex[val >> 4];
 190       hexnum[i * 2 + 1] = hex[val & 0xf];
 191     }
 192   hexnum[len * 2] = 0;
 193 }
 194
 195 #ifndef _LIBC
 196 static char
 197 hexval (char c)
 198 {
 199   if (c >= '0' && c <= '9')
 200     return (c - '0');
 201   else if (c >= 'a' && c <= 'z')
 202     return (c - 'a' + 10);
 203   else if (c >= 'A' && c <= 'Z')
 204     return (c - 'A' + 10);
 205   else
 206     return -1;
 207 }
 208 #endif