sunrpc/xcrypt.c

   1 /*
   2  * Copyright (c) 2010, Oracle America, 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 the "Oracle America, 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 #include <shlib-compat.h>
  51
  52 static const char hex[16] =
  53 {
  54   '0', '1', '2', '3', '4', '5', '6', '7',
  55   '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  56 };
  57
  58
  59 #ifdef _LIBC
  60 # define hexval(c) \
  61   (c >= '0' && c <= '9'                                                       \
  62    ? c - '0'                                                                  \
  63    : ({ int upp = toupper (c);                                                \
  64         upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))
  65 #else
  66 static char hexval (char);
  67 #endif
  68
  69 static void hex2bin (int, char *, char *);
  70 static void bin2hex (int, unsigned char *, char *);
  71 void passwd2des_internal (char *pw, char *key);
  72 #ifdef _LIBC
  73 libc_hidden_proto (passwd2des_internal)
  74 #endif
  75
  76 /*
  77  * Turn password into DES key
  78  */
  79 void
  80 passwd2des_internal (char *pw, char *key)
  81 {
  82   int i;
  83
  84   memset (key, 0, 8);
  85   for (i = 0; *pw && i < 8; ++i)
  86     key[i] ^= *pw++ << 1;
  87
  88   des_setparity (key);
  89 }
  90
  91 #ifdef _LIBC
  92 libc_hidden_def (passwd2des_internal)
  93 libc_sunrpc_symbol(passwd2des_internal, passwd2des, GLIBC_2_1)
  94 #else
  95 void passwd2des (char *pw, char *key)
  96 {
  97   return passwd2des_internal (pw, key);
  98 }
  99 #endif
 100
 101 /*
 102  * Encrypt a secret key given passwd
 103  * The secret key is passed and returned in hex notation.
 104  * Its length must be a multiple of 16 hex digits (64 bits).
 105  */
 106 int
 107 xencrypt (char *secret, char *passwd)
 108 {
 109   char key[8];
 110   char ivec[8];
 111   char *buf;
 112   int err;
 113   int len;
 114
 115   len = strlen (secret) / 2;
 116   buf = malloc ((unsigned) len);
 117   hex2bin (len, secret, buf);
 118   passwd2des_internal (passwd, key);
 119   memset (ivec, 0, 8);
 120
 121   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
 122   if (DES_FAILED (err))
 123     {
 124       free (buf);
 125       return 0;
 126     }
 127   bin2hex (len, (unsigned char *) buf, secret);
 128   free (buf);
 129   return 1;
 130 }
 131 libc_hidden_nolink_sunrpc (xencrypt, GLIBC_2_0)
 132
 133 /*
 134  * Decrypt secret key using passwd
 135  * The secret key is passed and returned in hex notation.
 136  * Once again, the length is a multiple of 16 hex digits
 137  */
 138 int
 139 xdecrypt (char *secret, char *passwd)
 140 {
 141   char key[8];
 142   char ivec[8];
 143   char *buf;
 144   int err;
 145   int len;
 146
 147   len = strlen (secret) / 2;
 148   buf = malloc ((unsigned) len);
 149
 150   hex2bin (len, secret, buf);
 151   passwd2des_internal (passwd, key);
 152   memset (ivec, 0, 8);
 153
 154   err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
 155   if (DES_FAILED (err))
 156     {
 157       free (buf);
 158       return 0;
 159     }
 160   bin2hex (len, (unsigned char *) buf, secret);
 161   free (buf);
 162   return 1;
 163 }
 164 #ifdef EXPORT_RPC_SYMBOLS
 165 libc_hidden_def (xdecrypt)
 166 #else
 167 libc_hidden_nolink_sunrpc (xdecrypt, GLIBC_2_1)
 168 #endif
 169
 170 /*
 171  * Hex to binary conversion
 172  */
 173 static void
 174 hex2bin (int len, char *hexnum, char *binnum)
 175 {
 176   int i;
 177
 178   for (i = 0; i < len; i++)
 179     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 180 }
 181
 182 /*
 183  * Binary to hex conversion
 184  */
 185 static void
 186 bin2hex (int len, unsigned char *binnum, char *hexnum)
 187 {
 188   int i;
 189   unsigned val;
 190
 191   for (i = 0; i < len; i++)
 192     {
 193       val = binnum[i];
 194       hexnum[i * 2] = hex[val >> 4];
 195       hexnum[i * 2 + 1] = hex[val & 0xf];
 196     }
 197   hexnum[len * 2] = 0;
 198 }
 199
 200 #ifndef _LIBC
 201 static char
 202 hexval (char c)
 203 {
 204   if (c >= '0' && c <= '9')
 205     return (c - '0');
 206   else if (c >= 'a' && c <= 'z')
 207     return (c - 'a' + 10);
 208   else if (c >= 'A' && c <= 'Z')
 209     return (c - 'A' + 10);
 210   else
 211     return -1;
 212 }
 213 #endif