Start development on 386BSD 0.0

[unix-history] / .ref-BSD-4_3_Net_2 / usr / src / lib / librpc / secure_rpc / rpc / xcrypt.c

#ifndef lint
static char sccsid[] = "@(#)xcrypt.c    2.2 88/08/10 4.0 RPCSRC";
#endif
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part.  Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
* 
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
* 
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
* 
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
* 
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
* 
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California  94043
*/
/*
* Hex encryption/decryption and utility routines
*
* Copyright (C) 1986, Sun Microsystems, Inc. 
*/

#include <stdio.h>
#include <des_crypt.h>

extern char *malloc();

extern char hex[];      /* forward */
static char hexval();

/*
* Encrypt a secret key given passwd
* The secret key is passed and returned in hex notation.
* Its length must be a multiple of 16 hex digits (64 bits).
*/
xencrypt(secret, passwd)
       char *secret;
       char *passwd;
{
       char key[8];
       char ivec[8];
       char *buf;
       int err;
       int len;

       len = strlen(secret) / 2;
       buf = malloc((unsigned)len);

       hex2bin(len, secret, buf);
       passwd2des(passwd, key);
       bzero(ivec, 8);

       err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
       if (DES_FAILED(err)) {  
               free(buf);
               return (0);
       }
       bin2hex(len, (unsigned char *) buf, secret);
       free(buf);
       return (1);
}

/*
* Decrypt secret key using passwd
* The secret key is passed and returned in hex notation.
* Once again, the length is a multiple of 16 hex digits
*/
xdecrypt(secret, passwd)
       char *secret;
       char *passwd;
{
       char key[8];
       char ivec[8];
       char *buf;
       int err;
       int len;

       len = strlen(secret) / 2;
       buf = malloc((unsigned)len);

       hex2bin(len, secret, buf);
       passwd2des(passwd, key);        
       bzero(ivec, 8);

       err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
       if (DES_FAILED(err)) {
               free(buf);
               return (0);
       }
       bin2hex(len, (unsigned char *) buf, secret);
       free(buf);
       return (1);
}


/*
* Turn password into DES key
*/
passwd2des(pw, key)
       char *pw;
       char *key;
{
       int i;

       bzero(key, 8);
       for (i = 0; *pw; i = (i+1)%8) {
               key[i] ^= *pw++ << 1;
       }
       des_setparity(key);
}



/*
* Hex to binary conversion
*/
static
hex2bin(len, hexnum, binnum)
       int len;
       char *hexnum;
       char *binnum;
{
       int i;

       for (i = 0; i < len; i++) {
               *binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);   
       }
}

/*
* Binary to hex conversion
*/
static
bin2hex(len, binnum, hexnum)
       int len;
       unsigned char *binnum;
       char *hexnum;
{
       int i;
       unsigned val;

       for (i = 0; i < len; i++) {
               val = binnum[i];
               hexnum[i*2] = hex[val >> 4];
               hexnum[i*2+1] = hex[val & 0xf];
       }
       hexnum[len*2] = 0;
}

static char hex[16] = {
       '0', '1', '2', '3', '4', '5', '6', '7',
       '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
};

static char
hexval(c)
       char c;
{
       if (c >= '0' && c <= '9') {
               return (c - '0');
       } else if (c >= 'a' && c <= 'z') {
               return (c - 'a' + 10);
       } else if (c >= 'A' && c <= 'Z') {
               return (c - 'A' + 10);
       } else {
               return (-1);
       }
}