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  */
  32 /*
  33  * Hex encryption/decryption and utility routines
  34  *
  35  * Copyright (C) 1986, Sun Microsystems, Inc.
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <rpc/des_crypt.h>
  42
  43 static char hex[16] = {
  44         '0', '1', '2', '3', '4', '5', '6', '7',
  45         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  46 };
  47
  48 static void     bin2hex(int, unsigned char *, char *);
  49 static void     hex2bin(int, char *, char *);
  50 static char     hexval(char);
  51 void            passwd2des(char *, char *);
  52
  53 /*
  54  * Encrypt a secret key given passwd
  55  * The secret key is passed and returned in hex notation.
  56  * Its length must be a multiple of 16 hex digits (64 bits).
  57  */
  58 int
  59 xencrypt(char *secret, 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         if ((buf = malloc((unsigned)len)) == NULL)
  69                 return(0);
  70
  71         hex2bin(len, secret, buf);
  72         passwd2des(passwd, key);
  73         bzero(ivec, 8);
  74
  75         err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  76         if (DES_FAILED(err)) {
  77                 free(buf);
  78                 return (0);
  79         }
  80         bin2hex(len, (unsigned char *) buf, secret);
  81         free(buf);
  82         return (1);
  83 }
  84
  85 /*
  86  * Decrypt secret key using passwd
  87  * The secret key is passed and returned in hex notation.
  88  * Once again, the length is a multiple of 16 hex digits
  89  */
  90 int
  91 xdecrypt(char *secret, char *passwd)
  92 {
  93         char key[8];
  94         char ivec[8];
  95         char *buf;
  96         int err;
  97         int len;
  98
  99         len = strlen(secret) / 2;
 100         if ((buf = malloc((unsigned)len)) == NULL)
 101                 return(0);
 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(char *pw, char *key)
 123 {
 124         int i;
 125
 126         bzero(key, 8);
 127         for (i = 0; *pw; i = (i+1)%8) {
 128                 key[i] ^= *pw++ << 1;
 129         }
 130         des_setparity(key);
 131 }
 132
 133
 134
 135 /*
 136  * Hex to binary conversion
 137  */
 138 static void
 139 hex2bin(int len, char *hexnum, char *binnum)
 140 {
 141         int i;
 142
 143         for (i = 0; i < len; i++) {
 144                 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
 145         }
 146 }
 147
 148 /*
 149  * Binary to hex conversion
 150  */
 151 static void
 152 bin2hex(int len, unsigned char *binnum, char *hexnum)
 153 {
 154         int i;
 155         unsigned val;
 156
 157         for (i = 0; i < len; i++) {
 158                 val = binnum[i];
 159                 hexnum[i*2] = hex[val >> 4];
 160                 hexnum[i*2+1] = hex[val & 0xf];
 161         }
 162         hexnum[len*2] = 0;
 163 }
 164
 165 static char
 166 hexval(char c)
 167 {
 168         if (c >= '0' && c <= '9') {
 169                 return (c - '0');
 170         } else if (c >= 'a' && c <= 'z') {
 171                 return (c - 'a' + 10);
 172         } else if (c >= 'A' && c <= 'Z') {
 173                 return (c - 'A' + 10);
 174         } else {
 175                 return (-1);
 176         }
 177 }