xcrypt.c revision 267654
133965Sjdp/* 2218822Sdim * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 333965Sjdp * unrestricted use provided that this legend is included on all tape 433965Sjdp * media and as a part of the software program in whole or part. Users 533965Sjdp * may copy or modify Sun RPC without charge, but are not authorized 633965Sjdp * to license or distribute it to anyone else except as part of a product or 733965Sjdp * program developed by the user. 833965Sjdp * 933965Sjdp * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 1033965Sjdp * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 1133965Sjdp * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 1233965Sjdp * 1333965Sjdp * Sun RPC is provided with no support and without any obligation on the 1433965Sjdp * part of Sun Microsystems, Inc. to assist in its use, correction, 1533965Sjdp * modification or enhancement. 1633965Sjdp * 1733965Sjdp * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 1833965Sjdp * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 1933965Sjdp * OR ANY PART THEREOF. 2033965Sjdp * 21218822Sdim * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22218822Sdim * or profits or other special, indirect and consequential damages, even if 2333965Sjdp * Sun has been advised of the possibility of such damages. 2433965Sjdp * 2533965Sjdp * Sun Microsystems, Inc. 2633965Sjdp * 2550 Garcia Avenue 2733965Sjdp * Mountain View, California 94043 28218822Sdim */ 2933965Sjdp/* 3033965Sjdp * Hex encryption/decryption and utility routines 3133965Sjdp * 3233965Sjdp * Copyright (C) 1986, Sun Microsystems, Inc. 3333965Sjdp */ 3433965Sjdp 3533965Sjdp#include <sys/cdefs.h> 3633965Sjdp__FBSDID("$FreeBSD: releng/9.3/lib/librpcsvc/xcrypt.c 189087 2009-02-26 20:32:11Z ed $"); 3733965Sjdp 3833965Sjdp#include <stdio.h> 3933965Sjdp#include <stdlib.h> 4033965Sjdp#include <string.h> 4133965Sjdp#include <rpc/des_crypt.h> 4233965Sjdp 4333965Sjdpstatic char hex[16] = { 44130561Sobrien '0', '1', '2', '3', '4', '5', '6', '7', 4533965Sjdp '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 46218822Sdim}; 4733965Sjdp 48218822Sdimstatic char hexval( char ); 49218822Sdimstatic void bin2hex( int, unsigned char *, char * ); 50218822Sdimstatic void hex2bin( int, char *, char * ); 5133965Sjdpvoid passwd2des( char *, char * ); 52218822Sdim 53218822Sdim/* 54218822Sdim * Encrypt a secret key given passwd 55218822Sdim * The secret key is passed and returned in hex notation. 56218822Sdim * Its length must be a multiple of 16 hex digits (64 bits). 57218822Sdim */ 5833965Sjdpint 5933965Sjdpxencrypt(char *secret, char *passwd) 60218822Sdim{ 61218822Sdim char key[8]; 6233965Sjdp char ivec[8]; 63218822Sdim char *buf; 64218822Sdim int err; 65218822Sdim int len; 66218822Sdim 67218822Sdim len = strlen(secret) / 2; 6833965Sjdp if ((buf = malloc((unsigned)len)) == NULL) { 6933965Sjdp return(0); 70130561Sobrien } 71130561Sobrien 72130561Sobrien hex2bin(len, secret, buf); 73218822Sdim passwd2des(passwd, key); 74130561Sobrien bzero(ivec, 8); 75130561Sobrien 76130561Sobrien err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec); 77130561Sobrien if (DES_FAILED(err)) { 78130561Sobrien free(buf); 79130561Sobrien return (0); 80130561Sobrien } 8133965Sjdp bin2hex(len, (unsigned char *) buf, secret); 8233965Sjdp free(buf); 83130561Sobrien return (1); 8433965Sjdp} 8533965Sjdp 86/* 87 * Decrypt secret key using passwd 88 * The secret key is passed and returned in hex notation. 89 * Once again, the length is a multiple of 16 hex digits 90 */ 91int 92xdecrypt(char *secret, 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 if ((buf = malloc((unsigned)len)) == NULL) { 102 return(0); 103 } 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 */ 123void 124passwd2des(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 */ 140static void 141hex2bin(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 */ 153static void 154bin2hex(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 167static char 168hexval(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