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_internal (char *pw, char *key);
  73 #ifdef _LIBC
  74 libc_hidden_proto (passwd2des_internal)
  75 #endif
  76
  77 /*
  78  * Turn password into DES key
  79  */
  80 void
  81 passwd2des_internal (char *pw, char *key)
  82 {
  83   int i;
  84
  85   memset (key, 0, 8);
  86   for (i = 0; *pw && i < 8; ++i)
  87     key[i] ^= *pw++ << 1;
  88
  89   des_setparity (key);
  90 }
  91
  92 #ifdef _LIBC
  93 libc_hidden_def (passwd2des_internal)
  94 strong_alias (passwd2des_internal, passwd2des)
  95 #else
  96 void passwd2des (char *pw, char *key)
  97 {
  98   return passwd2des_internal (pw, key);
  99 }
 100 #endif
 101
 102 /*
 103  * Encrypt a secret key given passwd
 104  * The secret key is passed and returned in hex notation.
 105  * Its length must be a multiple of 16 hex digits (64 bits).
 106  */
 107 int
 108 xencrypt (char *secret, char *passwd)
 109 {
 110   char key[8];
 111   char ivec[8];
 112   char *buf;
 113   int err;
 114   int len;
 115
 116   len = strlen (secret) / 2;
 117   buf = malloc ((unsigned) len);
 118   hex2bin (len, secret, buf);
 119   passwd2des_internal (passwd, key);
 120   memset (ivec, 0, 8);
 121
 122   err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
 123   if (DES_FAILED (err))
 124     {
 125       free (buf);
 126       return 0;
 127     }
 128   bin2hex (len, (unsigned char *) buf, secret);
 129   free (buf);
 130   return 1;
 131 }
 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
 165 /*
 166  * Hex to binary conversion
 167  */
 168 static void
 169 internal_function
 170 hex2bin (int len, char *hexnum, char *binnum)
 171 {
 172   int i;
 173
 174   for (i = 0; i < len; i++)
 175     *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
 176 }
 177
 178 /*
 179  * Binary to hex conversion
 180  */
 181 static void
 182 internal_function
 183 bin2hex (int len, unsigned char *binnum, char *hexnum)
 184 {
 185   int i;
 186   unsigned val;
 187
 188   for (i = 0; i < len; i++)
 189     {
 190       val = binnum[i];
 191       hexnum[i * 2] = hex[val >> 4];
 192       hexnum[i * 2 + 1] = hex[val & 0xf];
 193     }
 194   hexnum[len * 2] = 0;
 195 }
 196
 197 #ifndef _LIBC
 198 static char
 199 hexval (char c)
 200 {
 201   if (c >= '0' && c <= '9')
 202     return (c - '0');
 203   else if (c >= 'a' && c <= 'z')
 204     return (c - 'a' + 10);
 205   else if (c >= 'A' && c <= 'Z')
 206     return (c - 'A' + 10);
 207   else
 208     return -1;
 209 }
 210 #endif