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 } 179