sunrpc/xcrypt.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29
  30 /*
  31  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  32  */
  33
  34 #if 0
  35 #ident  "@(#)xcrypt.c   1.11    94/08/23 SMI"
  36 #endif
  37
  38 #if !defined(lint) && defined(SCCSIDS)
  39 static char sccsid[] = "@(#)xcrypt.c 1.3 89/03/24 Copyr 1986 Sun Micro";
  40 #endif
  41
  42 /*
  43  * xcrypt.c: Hex encryption/decryption and utility routines
  44  */
  45
  46 #include <ctype.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <sys/types.h>
  51 #include <rpc/des_crypt.h>
  52
  53 static const char hex[16] =
  54 {
  55   '0', '1', '2', '3', '4', '5', '6', '7',
  56   '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  57 };
  58
  59
  60 #ifdef _LIBC
  61 # define hexval(c) \
  62   (c >= '0' && c <= '9'                                                       \
  63    ? c - '0'                                                                  \
  64    : ({ int upp = toupper (c);                                                \
  65         upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))
  66 #else
  67 static char hexval (char) internal_function;
  68 #endif
  69
  70 static void hex2bin (int, char *, char *) internal_function;
  71 static void bin2hex (int, unsigned char *, char *) internal_function;
  72 void passwd2des (char *pw, char *key);
  73
  74 /*
  75  * Encrypt a secret key given passwd
  76  * The secret key is passed and returned in hex notation.
  77  * Its length must be a multiple of 16 hex digits (64 bits).
  78  */
  79 int
  80 xencrypt (char *secret, char *passwd)
  81 {
  82   char key[8];
  83   char ivec[8];
  84   char *buf;
  85   int err;
  86   int len;
  87
  88   len = strlen (secret) / 2;
  89   buf = malloc ((unsigned) len);
  90   hex2bin (len, secret, buf);
  91   passwd2des (passwd, key);
  92   memset (ivec, 0, 8);
  93
  94   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  95   if (DES_FAILED (err))
  96     {
  97       free (buf);
  98       return 0;
  99     }
 100   bin2hex (len, (unsigned char *) buf, secret);
 101   free (buf);
 102   return 1;
 103 }
 104
 105 /*
 106  * Decrypt secret key using passwd
 107  * The secret key is passed and returned in hex notation.
 108  * Once again, the length is a multiple of 16 hex digits
 109  */
 110 int
 111 xdecrypt (char *secret, char *passwd)
 112 {
 113   char key[8];
 114   char ivec[8];
 115   char *buf;
 116   int err;
 117   int len;
 118
 119   len = strlen (secret) / 2;
 120   buf = malloc ((unsigned) len);
 121
 122   hex2bin (len, secret, buf);
 123   passwd2des (passwd, key);
 124   memset (ivec, 0, 8);
 125
 126   err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
 127   if (DES_FAILED (err))
 128     {
 129       free (buf);
 130       return 0;
 131     }
 132   bin2hex (len, (unsigned char *) buf, secret);
 133   free (buf);
 134   return 1;
 135 }
 136
 137 /*
 138  * Turn password into DES key
 139  */
 140 void
 141 passwd2des (char *pw, char *key)
 142 {
 143   int i;
 144
 145   memset (key, 0, 8);
 146   for (i = 0; *pw && i < 8; ++i)
 147     key[i] ^= *pw++ << 1;
 148
 149   des_setparity (key);
 150 }
 151
 152 /*
 153  * Hex to binary conversion
 154  */
 155 static void
 156 internal_function
 157 hex2bin (int len, char *hexnum, char *binnum)
 158 {
 159   int i;
 160
 161   for (i = 0; i < len; i++)
 162     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 163 }
 164
 165 /*
 166  * Binary to hex conversion
 167  */
 168 static void
 169 internal_function
 170 bin2hex (int len, unsigned char *binnum, char *hexnum)
 171 {
 172   int i;
 173   unsigned val;
 174
 175   for (i = 0; i < len; i++)
 176     {
 177       val = binnum[i];
 178       hexnum[i * 2] = hex[val >> 4];
 179       hexnum[i * 2 + 1] = hex[val & 0xf];
 180     }
 181   hexnum[len * 2] = 0;
 182 }
 183
 184 #ifndef _LIBC
 185 static char
 186 hexval (char c)
 187 {
 188   if (c >= '0' && c <= '9')
 189     return (c - '0');
 190   else if (c >= 'a' && c <= 'z')
 191     return (c - 'a' + 10);
 192   else if (c >= 'A' && c <= 'Z')
 193     return (c - 'A' + 10);
 194   else
 195     return -1;
 196 }
 197 #endif