source: rtems/cpukit/librpc/src/rpc/des_crypt.c @ e5fc1df

/*
 * 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
 */
/*
 * des_crypt.c, DES encryption library routines
 * Copyright (C) 1986, Sun Microsystems, Inc.
 */

#include <sys/types.h>
#include <rpc/des_crypt.h>
#include <rpc/des.h>

#ifndef lint
/* from: static char sccsid[] = "@(#)des_crypt.c        2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI"; */
static const char rcsid[] = "$FreeBSD: src/lib/libc/rpc/des_crypt.c,v 1.3 1999/08/28 00:00:38 peter Exp $";
#endif

static int common_crypt __P(( char *, char *, register unsigned, unsigned, struct desparams * ));
int (*__des_crypt_LOCAL)() = 0;
extern _des_crypt_call __P(( char *, int, struct desparams * ));
/*
 * Copy 8 bytes
 */
#define COPY8(src, dst) { \
        register char *a = (char *) dst; \
        register char *b = (char *) src; \
        *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
        *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
}
 
/*
 * Copy multiple of 8 bytes
 */
#define DESCOPY(src, dst, len) { \
        register char *a = (char *) dst; \
        register char *b = (char *) src; \
        register int i; \
        for (i = (int) len; i > 0; i -= 8) { \
                *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
                *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
        } \
}

/*
 * CBC mode encryption
 */
int
cbc_crypt(key, buf, len, mode, ivec)
        char *key;
        char *buf;
        unsigned len;
        unsigned mode;
        char *ivec;     
{
        int err;
        struct desparams dp;

#ifdef BROKEN_DES
        dp.UDES.UDES_buf = buf;
        dp.des_mode = ECB;
#else
        dp.des_mode = CBC;
#endif
        COPY8(ivec, dp.des_ivec);
        err = common_crypt(key, buf, len, mode, &dp);
        COPY8(dp.des_ivec, ivec);
        return(err);
}


/*
 * ECB mode encryption
 */
int
ecb_crypt(key, buf, len, mode)
        char *key;
        char *buf;
        unsigned len;
        unsigned mode;
{
        struct desparams dp;

#ifdef BROKEN_DES
        dp.UDES.UDES_buf = buf;
        dp.des_mode = CBC;
#else
        dp.des_mode = ECB;
#endif
        return(common_crypt(key, buf, len, mode, &dp));
}



/*
 * Common code to cbc_crypt() & ecb_crypt()
 */
static int
common_crypt(key, buf, len, mode, desp) 
        char *key;      
        char *buf;
        register unsigned len;
        unsigned mode;
        register struct desparams *desp;
{
        register int desdev;

        if ((len % 8) != 0 || len > DES_MAXDATA) {
                return(DESERR_BADPARAM);
        }
        desp->des_dir =
                ((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;

        desdev = mode & DES_DEVMASK;
        COPY8(key, desp->des_key);
        /* 
         * software
         */
        if (__des_crypt_LOCAL != NULL) {
                if (!__des_crypt_LOCAL(buf, len, desp)) {
                        return (DESERR_HWERROR);
                }
        } else {
                if (!_des_crypt_call(buf, len, desp)) {
                        return (DESERR_HWERROR);
                }
        }
        return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
}