xcrypt.c revision 92917
1181053Srwatson/* 2180701Srwatson * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3155192Srwatson * unrestricted use provided that this legend is included on all tape 4155192Srwatson * media and as a part of the software program in whole or part. Users 5155192Srwatson * may copy or modify Sun RPC without charge, but are not authorized 6155192Srwatson * to license or distribute it to anyone else except as part of a product or 7155192Srwatson * program developed by the user. 8155192Srwatson * 9155192Srwatson * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10155192Srwatson * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11155192Srwatson * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12155192Srwatson * 13180701Srwatson * Sun RPC is provided with no support and without any obligation on the 14155192Srwatson * part of Sun Microsystems, Inc. to assist in its use, correction, 15155192Srwatson * modification or enhancement. 16155192Srwatson * 17155192Srwatson * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18155192Srwatson * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19155192Srwatson * OR ANY PART THEREOF. 20155192Srwatson * 21155192Srwatson * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22155192Srwatson * or profits or other special, indirect and consequential damages, even if 23155192Srwatson * Sun has been advised of the possibility of such damages. 24155192Srwatson * 25155192Srwatson * Sun Microsystems, Inc. 26155192Srwatson * 2550 Garcia Avenue 27155192Srwatson * Mountain View, California 94043 28155192Srwatson */ 29155192Srwatson/* 30178186Srwatson * Hex encryption/decryption and utility routines 31178186Srwatson * 32178186Srwatson * Copyright (C) 1986, Sun Microsystems, Inc. 33155192Srwatson */ 34155192Srwatson 35155192Srwatson#include <sys/cdefs.h> 36155192Srwatson__FBSDID("$FreeBSD: head/lib/librpcsvc/xcrypt.c 92917 2002-03-21 23:54:04Z obrien $"); 37155192Srwatson 38155192Srwatson#include <stdio.h> 39155192Srwatson#include <stdlib.h> 40155192Srwatson#include <string.h> 41155192Srwatson#include <rpc/des_crypt.h> 42159277Srwatson 43155192Srwatsonstatic char hex[]; /* forward */ 44155192Srwatsonstatic char hexval( char ); 45155192Srwatsonstatic void bin2hex( int, unsigned char *, char * ); 46155192Srwatsonstatic void hex2bin( int, char *, char * ); 47155192Srwatsonvoid passwd2des( char *, char * ); 48155192Srwatson 49155192Srwatson/* 50155192Srwatson * Encrypt a secret key given passwd 51155192Srwatson * The secret key is passed and returned in hex notation. 52155192Srwatson * Its length must be a multiple of 16 hex digits (64 bits). 53155192Srwatson */ 54155192Srwatsonint 55170196Srwatsonxencrypt(secret, passwd) 56170196Srwatson char *secret; 57170196Srwatson char *passwd; 58170196Srwatson{ 59155192Srwatson char key[8]; 60155192Srwatson char ivec[8]; 61155192Srwatson char *buf; 62155192Srwatson int err; 63155192Srwatson int len; 64170585Srwatson 65155192Srwatson len = strlen(secret) / 2; 66155192Srwatson buf = malloc((unsigned)len); 67155192Srwatson 68155192Srwatson hex2bin(len, secret, buf); 69155192Srwatson passwd2des(passwd, key); 70155192Srwatson bzero(ivec, 8); 71155192Srwatson 72155192Srwatson err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec); 73155192Srwatson if (DES_FAILED(err)) { 74155192Srwatson free(buf); 75155192Srwatson return (0); 76155192Srwatson } 77155192Srwatson bin2hex(len, (unsigned char *) buf, secret); 78155192Srwatson free(buf); 79155192Srwatson return (1); 80155192Srwatson} 81155192Srwatson 82155192Srwatson/* 83155192Srwatson * Decrypt secret key using passwd 84155192Srwatson * The secret key is passed and returned in hex notation. 85155192Srwatson * Once again, the length is a multiple of 16 hex digits 86155192Srwatson */ 87155192Srwatsonint 88155192Srwatsonxdecrypt(secret, passwd) 89155192Srwatson char *secret; 90155192Srwatson char *passwd; 91155192Srwatson{ 92155192Srwatson char key[8]; 93155192Srwatson char ivec[8]; 94155192Srwatson char *buf; 95155192Srwatson int err; 96155192Srwatson int len; 97155192Srwatson 98155192Srwatson len = strlen(secret) / 2; 99155192Srwatson buf = malloc((unsigned)len); 100155192Srwatson 101155192Srwatson hex2bin(len, secret, buf); 102155192Srwatson passwd2des(passwd, key); 103155192Srwatson bzero(ivec, 8); 104195925Srwatson 105195925Srwatson err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec); 106195925Srwatson if (DES_FAILED(err)) { 107195925Srwatson free(buf); 108195925Srwatson return (0); 109195925Srwatson } 110195925Srwatson bin2hex(len, (unsigned char *) buf, secret); 111195925Srwatson free(buf); 112195925Srwatson return (1); 113195925Srwatson} 114195925Srwatson 115195925Srwatson 116195925Srwatson/* 117195925Srwatson * Turn password into DES key 118195925Srwatson */ 119195925Srwatsonvoid 120195925Srwatsonpasswd2des(pw, key) 121195925Srwatson char *pw; 122195925Srwatson char *key; 123195925Srwatson{ 124195925Srwatson int i; 125195925Srwatson 126195925Srwatson bzero(key, 8); 127195925Srwatson for (i = 0; *pw; i = (i+1)%8) { 128195925Srwatson key[i] ^= *pw++ << 1; 129195925Srwatson } 130155192Srwatson des_setparity(key); 131155192Srwatson} 132155192Srwatson 133155192Srwatson 134155192Srwatson 135155192Srwatson/* 136155192Srwatson * Hex to binary conversion 137155192Srwatson */ 138155192Srwatsonstatic void 139155192Srwatsonhex2bin(len, hexnum, binnum) 140155192Srwatson int len; 141155192Srwatson char *hexnum; 142155192Srwatson char *binnum; 143155192Srwatson{ 144155192Srwatson int i; 145155192Srwatson 146155192Srwatson for (i = 0; i < len; i++) { 147155192Srwatson *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]); 148155192Srwatson } 149155192Srwatson} 150155192Srwatson 151155192Srwatson/* 152155192Srwatson * Binary to hex conversion 153155192Srwatson */ 154155192Srwatsonstatic void 155155192Srwatsonbin2hex(len, binnum, hexnum) 156155192Srwatson int len; 157155192Srwatson unsigned char *binnum; 158155192Srwatson char *hexnum; 159155192Srwatson{ 160155192Srwatson int i; 161155192Srwatson unsigned val; 162155192Srwatson 163155192Srwatson for (i = 0; i < len; i++) { 164155192Srwatson val = binnum[i]; 165155192Srwatson hexnum[i*2] = hex[val >> 4]; 166155192Srwatson hexnum[i*2+1] = hex[val & 0xf]; 167155192Srwatson } 168155192Srwatson hexnum[len*2] = 0; 169155192Srwatson} 170155192Srwatson 171155192Srwatsonstatic char hex[16] = { 172155192Srwatson '0', '1', '2', '3', '4', '5', '6', '7', 173155192Srwatson '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 174155192Srwatson}; 175155192Srwatson 176155192Srwatsonstatic char 177155192Srwatsonhexval(c) 178155192Srwatson char c; 179155192Srwatson{ 180155192Srwatson if (c >= '0' && c <= '9') { 181155192Srwatson return (c - '0'); 182155192Srwatson } else if (c >= 'a' && c <= 'z') { 183155192Srwatson return (c - 'a' + 10); 184155192Srwatson } else if (c >= 'A' && c <= 'Z') { 185155192Srwatson return (c - 'A' + 10); 186155192Srwatson } else { 187155192Srwatson return (-1); 188155192Srwatson } 189155192Srwatson} 190155192Srwatson