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/*

 * 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);

}