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, MERCHANTABILITY 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 */ 32 /* 33 * Hex encryption/decryption and utility routines 34 * 35 * Copyright (C) 1986, Sun Microsystems, Inc. 36 */ 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <rpc/des_crypt.h> 42 43 static char hex[16] = { 44 '0', '1', '2', '3', '4', '5', '6', '7', 45 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 46 }; 47 48 static void bin2hex(int, unsigned char *, char *); 49 static void hex2bin(int, char *, char *); 50 static char hexval(char); 51 void passwd2des(char *, char *); 52 53 /* 54 * Encrypt a secret key given passwd 55 * The secret key is passed and returned in hex notation. 56 * Its length must be a multiple of 16 hex digits (64 bits). 57 */ 58 int 59 xencrypt(char *secret, 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 if ((buf = malloc((unsigned)len)) == NULL) 69 return(0); 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(char *secret, char *passwd) 92 { 93 char key[8]; 94 char ivec[8]; 95 char *buf; 96 int err; 97 int len; 98 99 len = strlen(secret) / 2; 100 if ((buf = malloc((unsigned)len)) == NULL) 101 return(0); 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(char *pw, char *key) 123 { 124 int i; 125 126 bzero(key, 8); 127 for (i = 0; *pw; i = (i+1)%8) { 128 key[i] ^= *pw++ << 1; 129 } 130 des_setparity(key); 131 } 132 133 134 135 /* 136 * Hex to binary conversion 137 */ 138 static void 139 hex2bin(int len, char *hexnum, char *binnum) 140 { 141 int i; 142 143 for (i = 0; i < len; i++) { 144 *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]); 145 } 146 } 147 148 /* 149 * Binary to hex conversion 150 */ 151 static void 152 bin2hex(int len, unsigned char *binnum, char *hexnum) 153 { 154 int i; 155 unsigned val; 156 157 for (i = 0; i < len; i++) { 158 val = binnum[i]; 159 hexnum[i*2] = hex[val >> 4]; 160 hexnum[i*2+1] = hex[val & 0xf]; 161 } 162 hexnum[len*2] = 0; 163 } 164 165 static char 166 hexval(char c) 167 { 168 if (c >= '0' && c <= '9') { 169 return (c - '0'); 170 } else if (c >= 'a' && c <= 'z') { 171 return (c - 'a' + 10); 172 } else if (c >= 'A' && c <= 'Z') { 173 return (c - 'A' + 10); 174 } else { 175 return (-1); 176 } 177 } 178