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 1.6 2008/02/04 07:56:36 matteo Exp $
  31  * $DragonFly: src/lib/librpcsvc/xcrypt.c,v 1.4 2007/11/25 14:33:02 swildner 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[16] = {
  46         '0', '1', '2', '3', '4', '5', '6', '7',
  47         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  48 };
  49
  50 static void     bin2hex(int, unsigned char *, char *);
  51 static void     hex2bin(int, char *, char *);
  52 static char     hexval(char);
  53 void            passwd2des(char *, char *);
  54
  55 /*
  56  * Encrypt a secret key given passwd
  57  * The secret key is passed and returned in hex notation.
  58  * Its length must be a multiple of 16 hex digits (64 bits).
  59  */
  60 int
  61 xencrypt(char *secret, char *passwd)
  62 {
  63         char key[8];
  64         char ivec[8];
  65         char *buf;
  66         int err;
  67         int len;
  68
  69         len = strlen(secret) / 2;
  70         if ((buf = malloc((unsigned)len)) == NULL)
  71                 return(0);
  72
  73         hex2bin(len, secret, buf);
  74         passwd2des(passwd, key);
  75         bzero(ivec, 8);
  76
  77         err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  78         if (DES_FAILED(err)) {
  79                 free(buf);
  80                 return (0);
  81         }
  82         bin2hex(len, (unsigned char *) buf, secret);
  83         free(buf);
  84         return (1);
  85 }
  86
  87 /*
  88  * Decrypt secret key using passwd
  89  * The secret key is passed and returned in hex notation.
  90  * Once again, the length is a multiple of 16 hex digits
  91  */
  92 int
  93 xdecrypt(char *secret, char *passwd)
  94 {
  95         char key[8];
  96         char ivec[8];
  97         char *buf;
  98         int err;
  99         int len;
 100
 101         len = strlen(secret) / 2;
 102         if ((buf = malloc((unsigned)len)) == NULL)
 103                 return(0);
 104
 105         hex2bin(len, secret, buf);
 106         passwd2des(passwd, key);
 107         bzero(ivec, 8);
 108
 109         err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
 110         if (DES_FAILED(err)) {
 111                 free(buf);
 112                 return (0);
 113         }
 114         bin2hex(len, (unsigned char *) buf, secret);
 115         free(buf);
 116         return (1);
 117 }
 118
 119
 120 /*
 121  * Turn password into DES key
 122  */
 123 void
 124 passwd2des(char *pw, 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(int len, char *hexnum, char *binnum)
 142 {
 143         int i;
 144
 145         for (i = 0; i < len; i++) {
 146                 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
 147         }
 148 }
 149
 150 /*
 151  * Binary to hex conversion
 152  */
 153 static void
 154 bin2hex(int len, unsigned char *binnum, char *hexnum)
 155 {
 156         int i;
 157         unsigned val;
 158
 159         for (i = 0; i < len; i++) {
 160                 val = binnum[i];
 161                 hexnum[i*2] = hex[val >> 4];
 162                 hexnum[i*2+1] = hex[val & 0xf];
 163         }
 164         hexnum[len*2] = 0;
 165 }
 166
 167 static char
 168 hexval(char c)
 169 {
 170         if (c >= '0' && c <= '9') {
 171                 return (c - '0');
 172         } else if (c >= 'a' && c <= 'z') {
 173                 return (c - 'a' + 10);
 174         } else if (c >= 'A' && c <= 'Z') {
 175                 return (c - 'A' + 10);
 176         } else {
 177                 return (-1);
 178         }
 179 }