lib/librpcsvc/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  * @(#)xcrypt.c 2.2 88/08/10 4.0 RPCSRC
  30  * $FreeBSD: src/lib/librpcsvc/xcrypt.c,v 1.2 1999/08/28 00:05:24 peter Exp $
  31  * $DragonFly: src/lib/librpcsvc/xcrypt.c,v 1.3 2003/11/12 20:21:31 eirikn Exp $
  32  */
  33 /*
  34  * Hex encryption/decryption and utility routines
  35  *
  36  * Copyright (C) 1986, Sun Microsystems, Inc.
  37  */
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <sys/cdefs.h>
  43 #include <rpc/des_crypt.h>
  44
  45 static char hex[];      /* forward */
  46 static char hexval ( char );
  47 static void bin2hex ( int, unsigned char *, char * );
  48 static void hex2bin ( int, char *, char * );
  49 void passwd2des ( char *, char * );
  50
  51 /*
  52  * Encrypt a secret key given passwd
  53  * The secret key is passed and returned in hex notation.
  54  * Its length must be a multiple of 16 hex digits (64 bits).
  55  */
  56 int
  57 xencrypt(secret, passwd)
  58         char *secret;
  59         char *passwd;
  60 {
  61         char key[8];
  62         char ivec[8];
  63         char *buf;
  64         int err;
  65         int len;
  66
  67         len = strlen(secret) / 2;
  68         buf = malloc((unsigned)len);
  69
  70         hex2bin(len, secret, buf);
  71         passwd2des(passwd, key);
  72         bzero(ivec, 8);
  73
  74         err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  75         if (DES_FAILED(err)) {
  76                 free(buf);
  77                 return (0);
  78         }
  79         bin2hex(len, (unsigned char *) buf, secret);
  80         free(buf);
  81         return (1);
  82 }
  83
  84 /*
  85  * Decrypt secret key using passwd
  86  * The secret key is passed and returned in hex notation.
  87  * Once again, the length is a multiple of 16 hex digits
  88  */
  89 int
  90 xdecrypt(secret, passwd)
  91         char *secret;
  92         char *passwd;
  93 {
  94         char key[8];
  95         char ivec[8];
  96         char *buf;
  97         int err;
  98         int len;
  99
 100         len = strlen(secret) / 2;
 101         buf = malloc((unsigned)len);
 102
 103         hex2bin(len, secret, buf);
 104         passwd2des(passwd, key);
 105         bzero(ivec, 8);
 106
 107         err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
 108         if (DES_FAILED(err)) {
 109                 free(buf);
 110                 return (0);
 111         }
 112         bin2hex(len, (unsigned char *) buf, secret);
 113         free(buf);
 114         return (1);
 115 }
 116
 117
 118 /*
 119  * Turn password into DES key
 120  */
 121 void
 122 passwd2des(pw, key)
 123         char *pw;
 124         char *key;
 125 {
 126         int i;
 127
 128         bzero(key, 8);
 129         for (i = 0; *pw; i = (i+1)%8) {
 130                 key[i] ^= *pw++ << 1;
 131         }
 132         des_setparity(key);
 133 }
 134
 135
 136
 137 /*
 138  * Hex to binary conversion
 139  */
 140 static void
 141 hex2bin(len, hexnum, binnum)
 142         int len;
 143         char *hexnum;
 144         char *binnum;
 145 {
 146         int i;
 147
 148         for (i = 0; i < len; i++) {
 149                 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
 150         }
 151 }
 152
 153 /*
 154  * Binary to hex conversion
 155  */
 156 static void
 157 bin2hex(len, binnum, hexnum)
 158         int len;
 159         unsigned char *binnum;
 160         char *hexnum;
 161 {
 162         int i;
 163         unsigned val;
 164
 165         for (i = 0; i < len; i++) {
 166                 val = binnum[i];
 167                 hexnum[i*2] = hex[val >> 4];
 168                 hexnum[i*2+1] = hex[val & 0xf];
 169         }
 170         hexnum[len*2] = 0;
 171 }
 172
 173 static char hex[16] = {
 174         '0', '1', '2', '3', '4', '5', '6', '7',
 175         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
 176 };
 177
 178 static char
 179 hexval(c)
 180         char c;
 181 {
 182         if (c >= '0' && c <= '9') {
 183                 return (c - '0');
 184         } else if (c >= 'a' && c <= 'z') {
 185                 return (c - 'a' + 10);
 186         } else if (c >= 'A' && c <= 'Z') {
 187                 return (c - 'A' + 10);
 188         } else {
 189                 return (-1);
 190         }
 191 }