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 * Hex encryption/decryption and utility routines 31 * 32 * Copyright (C) 1986, Sun Microsystems, Inc. 33 */ 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <sys/cdefs.h> 39 #include <rpc/des_crypt.h> 40 41 #ifndef lint 42 /*from: static char sccsid[] = "@(#)xcrypt.c 2.2 88/08/10 4.0 RPCSRC"; */ 43 static const char rcsid[] = "$Id: xcrypt.c,v 1.1 1996/11/12 02:36:12 wpaul Exp $"; 44 #endif 45 46 static char hex[]; /* forward */ 47 static char hexval __P(( char )); 48 static void bin2hex __P(( int, unsigned char *, char * )); 49 static void hex2bin __P(( int, char *, char * )); 50 void passwd2des __P(( char *, char * )); 51 52 /* 53 * Encrypt a secret key given passwd 54 * The secret key is passed and returned in hex notation. 55 * Its length must be a multiple of 16 hex digits (64 bits). 56 */ 57 int 58 xencrypt(secret, passwd) 59 char *secret; 60 char *passwd; 61 { 62 char key[8]; 63 char ivec[8]; 64 char *buf; 65 int err; 66 int len; 67 68 len = strlen(secret) / 2; 69 buf = malloc((unsigned)len); 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(secret, passwd) 92 char *secret; 93 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 buf = malloc((unsigned)len); 103 104 hex2bin(len, secret, buf); 105 passwd2des(passwd, key); 106 bzero(ivec, 8); 107 108 err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec); 109 if (DES_FAILED(err)) { 110 free(buf); 111 return (0); 112 } 113 bin2hex(len, (unsigned char *) buf, secret); 114 free(buf); 115 return (1); 116 } 117 118 119 /* 120 * Turn password into DES key 121 */ 122 void 123 passwd2des(pw, key) 124 char *pw; 125 char *key; 126 { 127 int i; 128 129 bzero(key, 8); 130 for (i = 0; *pw; i = (i+1)%8) { 131 key[i] ^= *pw++ << 1; 132 } 133 des_setparity(key); 134 } 135 136 137 138 /* 139 * Hex to binary conversion 140 */ 141 static void 142 hex2bin(len, hexnum, binnum) 143 int len; 144 char *hexnum; 145 char *binnum; 146 { 147 int i; 148 149 for (i = 0; i < len; i++) { 150 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]); 151 } 152 } 153 154 /* 155 * Binary to hex conversion 156 */ 157 static void 158 bin2hex(len, binnum, hexnum) 159 int len; 160 unsigned char *binnum; 161 char *hexnum; 162 { 163 int i; 164 unsigned val; 165 166 for (i = 0; i < len; i++) { 167 val = binnum[i]; 168 hexnum[i*2] = hex[val >> 4]; 169 hexnum[i*2+1] = hex[val & 0xf]; 170 } 171 hexnum[len*2] = 0; 172 } 173 174 static char hex[16] = { 175 '0', '1', '2', '3', '4', '5', '6', '7', 176 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 177 }; 178 179 static char 180 hexval(c) 181 char c; 182 { 183 if (c >= '0' && c <= '9') { 184 return (c - '0'); 185 } else if (c >= 'a' && c <= 'z') { 186 return (c - 'a' + 10); 187 } else if (c >= 'A' && c <= 'Z') { 188 return (c - 'A' + 10); 189 } else { 190 return (-1); 191 } 192 } 193