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 #ident  "@(#)xcrypt.c   1.11    94/08/23 SMI"
  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 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 (char *pw, char *key);
  71
  72 /*
  73  * Encrypt a secret key given passwd
  74  * The secret key is passed and returned in hex notation.
  75  * Its length must be a multiple of 16 hex digits (64 bits).
  76  */
  77 int
  78 xencrypt (char *secret, char *passwd)
  79 {
  80   char key[8];
  81   char ivec[8];
  82   char *buf;
  83   int err;
  84   int len;
  85
  86   len = strlen (secret) / 2;
  87   buf = malloc ((unsigned) len);
  88   hex2bin (len, secret, buf);
  89   passwd2des (passwd, key);
  90   memset (ivec, 0, 8);
  91
  92   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  93   if (DES_FAILED (err))
  94     {
  95       free (buf);
  96       return 0;
  97     }
  98   bin2hex (len, (unsigned char *) buf, secret);
  99   free (buf);
 100   return 1;
 101 }
 102
 103 /*
 104  * Decrypt secret key using passwd
 105  * The secret key is passed and returned in hex notation.
 106  * Once again, the length is a multiple of 16 hex digits
 107  */
 108 int
 109 xdecrypt (char *secret, char *passwd)
 110 {
 111   char key[8];
 112   char ivec[8];
 113   char *buf;
 114   int err;
 115   int len;
 116
 117   len = strlen (secret) / 2;
 118   buf = malloc ((unsigned) len);
 119
 120   hex2bin (len, secret, buf);
 121   passwd2des (passwd, key);
 122   memset (ivec, 0, 8);
 123
 124   err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
 125   if (DES_FAILED (err))
 126     {
 127       free (buf);
 128       return 0;
 129     }
 130   bin2hex (len, (unsigned char *) buf, secret);
 131   free (buf);
 132   return 1;
 133 }
 134
 135 /*
 136  * Turn password into DES key
 137  */
 138 void
 139 passwd2des (char *pw, char *key)
 140 {
 141   int i;
 142
 143   memset (key, 0, 8);
 144   for (i = 0; *pw; i = (i + 1) % 8)
 145     key[i] ^= *pw++ << 1;
 146
 147   des_setparity (key);
 148 }
 149
 150 /*
 151  * Hex to binary conversion
 152  */
 153 static void
 154 internal_function
 155 hex2bin (int len, char *hexnum, char *binnum)
 156 {
 157   int i;
 158
 159   for (i = 0; i < len; i++)
 160     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 161 }
 162
 163 /*
 164  * Binary to hex conversion
 165  */
 166 static void
 167 internal_function
 168 bin2hex (int len, unsigned char *binnum, char *hexnum)
 169 {
 170   int i;
 171   unsigned val;
 172
 173   for (i = 0; i < len; i++)
 174     {
 175       val = binnum[i];
 176       hexnum[i * 2] = hex[val >> 4];
 177       hexnum[i * 2 + 1] = hex[val & 0xf];
 178     }
 179   hexnum[len * 2] = 0;
 180 }
 181
 182 #ifndef _LIBC
 183 static char
 184 hexval (char c)
 185 {
 186   if (c >= '0' && c <= '9')
 187     return (c - '0');
 188   else if (c >= 'a' && c <= 'z')
 189     return (c - 'a' + 10);
 190   else if (c >= 'A' && c <= 'Z')
 191     return (c - 'A' + 10);
 192   else
 193     return -1;
 194 }
 195 #endif