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/*
* des_crypt.c, DES encryption library routines
* Copyright (C) 1986, Sun Microsystems, Inc.
*
* 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.
*/
#include <sys/types.h>
#include <rpc/des_crypt.h>
#include "des.h"
extern int _des_crypt (char *, unsigned, 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++; \
} \
}
/*
* Common code to cbc_crypt() & ecb_crypt()
*/
static int
common_crypt (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 (buf, len, desp))
return DESERR_HWERROR;
return desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE;
}
/*
* CBC mode encryption
*/
int
cbc_crypt (char *key, char *buf, unsigned int len, unsigned int mode,
char *ivec)
{
int err;
struct desparams dp;
dp.des_mode = CBC;
COPY8 (ivec, dp.des_ivec);
err = common_crypt (key, buf, len, mode, &dp);
COPY8 (dp.des_ivec, ivec);
return err;
}
libc_hidden_def (cbc_crypt)
/*
* ECB mode encryption
*/
int
ecb_crypt (char *key, char *buf, unsigned int len, unsigned int mode)
{
struct desparams dp;
dp.des_mode = ECB;
return common_crypt (key, buf, len, mode, &dp);
}
libc_hidden_def (ecb_crypt)
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