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 } 180