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 } 192