source: rtems-libbsd/freebsd/lib/libc/rpc/des_crypt.c @ 9880635

#include <machine/rtems-bsd-user-space.h>

/*-
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its 
 *   contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * 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>

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)des_crypt.c 2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
int (*__des_crypt_LOCAL)() = 0;
extern int _des_crypt_call(char *, int, struct desparams *);
/*
 * Copy 8 bytes
 */
#define COPY8(src, dst) { \
        char *a = (char *) dst; \
        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) { \
        char *a = (char *) dst; \
        char *b = (char *) src; \
        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;
        unsigned len;
        unsigned mode;
        struct desparams *desp;
{
        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);
}