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 1.4 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[];      /* 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(char *secret, char *passwd)
  58 {
  59         char key[8];
  60         char ivec[8];
  61         char *buf;
  62         int err;
  63         int len;
  64
  65         len = strlen(secret) / 2;
  66         buf = malloc((unsigned)len);
  67
  68         hex2bin(len, secret, buf);
  69         passwd2des(passwd, key);
  70         bzero(ivec, 8);
  71
  72         err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  73         if (DES_FAILED(err)) {
  74                 free(buf);
  75                 return (0);
  76         }
  77         bin2hex(len, (unsigned char *) buf, secret);
  78         free(buf);
  79         return (1);
  80 }
  81
  82 /*
  83  * Decrypt secret key using passwd
  84  * The secret key is passed and returned in hex notation.
  85  * Once again, the length is a multiple of 16 hex digits
  86  */
  87 int
  88 xdecrypt(char *secret, char *passwd)
  89 {
  90         char key[8];
  91         char ivec[8];
  92         char *buf;
  93         int err;
  94         int len;
  95
  96         len = strlen(secret) / 2;
  97         buf = malloc((unsigned)len);
  98
  99         hex2bin(len, secret, buf);
 100         passwd2des(passwd, key);
 101         bzero(ivec, 8);
 102
 103         err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
 104         if (DES_FAILED(err)) {
 105                 free(buf);
 106                 return (0);
 107         }
 108         bin2hex(len, (unsigned char *) buf, secret);
 109         free(buf);
 110         return (1);
 111 }
 112
 113
 114 /*
 115  * Turn password into DES key
 116  */
 117 void
 118 passwd2des(char *pw, char *key)
 119 {
 120         int i;
 121
 122         bzero(key, 8);
 123         for (i = 0; *pw; i = (i+1)%8) {
 124                 key[i] ^= *pw++ << 1;
 125         }
 126         des_setparity(key);
 127 }
 128
 129
 130
 131 /*
 132  * Hex to binary conversion
 133  */
 134 static void
 135 hex2bin(int len, char *hexnum, char *binnum)
 136 {
 137         int i;
 138
 139         for (i = 0; i < len; i++) {
 140                 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
 141         }
 142 }
 143
 144 /*
 145  * Binary to hex conversion
 146  */
 147 static void
 148 bin2hex(int len, unsigned char *binnum, char *hexnum)
 149 {
 150         int i;
 151         unsigned val;
 152
 153         for (i = 0; i < len; i++) {
 154                 val = binnum[i];
 155                 hexnum[i*2] = hex[val >> 4];
 156                 hexnum[i*2+1] = hex[val & 0xf];
 157         }
 158         hexnum[len*2] = 0;
 159 }
 160
 161 static char hex[16] = {
 162         '0', '1', '2', '3', '4', '5', '6', '7',
 163         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
 164 };
 165
 166 static char
 167 hexval(char c)
 168 {
 169         if (c >= '0' && c <= '9') {
 170                 return (c - '0');
 171         } else if (c >= 'a' && c <= 'z') {
 172                 return (c - 'a' + 10);
 173         } else if (c >= 'A' && c <= 'Z') {
 174                 return (c - 'A' + 10);
 175         } else {
 176                 return (-1);
 177         }
 178 }