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 static void passwd2des_internal (char *pw, char *key);
  73
  74
  75 /*
  76  * Turn password into DES key
  77  */
  78 static 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 strong_alias (passwd2des_internal, passwd2des)
  92 #else
  93 void passwd2des (char *pw, char *key)
  94 {
  95   return passwd2des_internal (pw, key);
  96 }
  97 #endif
  98
  99 /*
 100  * Encrypt a secret key given passwd
 101  * The secret key is passed and returned in hex notation.
 102  * Its length must be a multiple of 16 hex digits (64 bits).
 103  */
 104 int
 105 xencrypt (char *secret, char *passwd)
 106 {
 107   char key[8];
 108   char ivec[8];
 109   char *buf;
 110   int err;
 111   int len;
 112
 113   len = strlen (secret) / 2;
 114   buf = malloc ((unsigned) len);
 115   hex2bin (len, secret, buf);
 116   passwd2des_internal (passwd, key);
 117   memset (ivec, 0, 8);
 118
 119   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
 120   if (DES_FAILED (err))
 121     {
 122       free (buf);
 123       return 0;
 124     }
 125   bin2hex (len, (unsigned char *) buf, secret);
 126   free (buf);
 127   return 1;
 128 }
 129
 130 /*
 131  * Decrypt secret key using passwd
 132  * The secret key is passed and returned in hex notation.
 133  * Once again, the length is a multiple of 16 hex digits
 134  */
 135 int
 136 xdecrypt (char *secret, char *passwd)
 137 {
 138   char key[8];
 139   char ivec[8];
 140   char *buf;
 141   int err;
 142   int len;
 143
 144   len = strlen (secret) / 2;
 145   buf = malloc ((unsigned) len);
 146
 147   hex2bin (len, secret, buf);
 148   passwd2des_internal (passwd, key);
 149   memset (ivec, 0, 8);
 150
 151   err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
 152   if (DES_FAILED (err))
 153     {
 154       free (buf);
 155       return 0;
 156     }
 157   bin2hex (len, (unsigned char *) buf, secret);
 158   free (buf);
 159   return 1;
 160 }
 161
 162 /*
 163  * Hex to binary conversion
 164  */
 165 static void
 166 internal_function
 167 hex2bin (int len, char *hexnum, char *binnum)
 168 {
 169   int i;
 170
 171   for (i = 0; i < len; i++)
 172     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 173 }
 174
 175 /*
 176  * Binary to hex conversion
 177  */
 178 static void
 179 internal_function
 180 bin2hex (int len, unsigned char *binnum, char *hexnum)
 181 {
 182   int i;
 183   unsigned val;
 184
 185   for (i = 0; i < len; i++)
 186     {
 187       val = binnum[i];
 188       hexnum[i * 2] = hex[val >> 4];
 189       hexnum[i * 2 + 1] = hex[val & 0xf];
 190     }
 191   hexnum[len * 2] = 0;
 192 }
 193
 194 #ifndef _LIBC
 195 static char
 196 hexval (char c)
 197 {
 198   if (c >= '0' && c <= '9')
 199     return (c - '0');
 200   else if (c >= 'a' && c <= 'z')
 201     return (c - 'a' + 10);
 202   else if (c >= 'A' && c <= 'Z')
 203     return (c - 'A' + 10);
 204   else
 205     return -1;
 206 }
 207 #endif